### Citations

12375 |
Elements of Information Theory
- Cover, Thomas
- 1991
(Show Context)
Citation Context ...ansformed receive signal vector, transmit signal vector and noise vector. The transmit power is optimally allocated among the effective r̆ scalar channels using the well-known water-filling procedure =-=[22]-=-. As a result, P̆opti = (µ̆−σ2n=λ̆i)+; i= 1; : : : ; r̆; (2.14) where Q̆= V̆ ·diag(P̆opt1 ; : : : ; P̆optr̆ )V̆ H (2.15) = V̆(µ̆)(µ̆Ir̆−σ2n Λ̆−1)+V̆H and the capacity is given by Cw f (H) = r̆ ∑ i=1 l... |

7671 |
Matrix Analysis
- Horn, Ch
- 1986
(Show Context)
Citation Context ...nnel state information is perfectly known at the transmitter (CSIT), the matrix channel can be decoupled into a set of parallel scalar Gaussian channels by means of singular value decomposition (SVD) =-=[21]-=-. Specifically, let r̆ = rank(H) and let H be represented by its SVD: H= ŬΛ̆1=2V̆H (2.12) 13 where Ŭ; Λ̆; V̆ are nR× r̆,r̆× r̆ and nT × r̆ matrices, respectively, Ŭ and V̆ are unitary matrices. Λ̆ ... |

7413 | Convex Optimization
- Boyd, Vandenberghe
- 2004
(Show Context)
Citation Context ...es. For any convex cone K, its dual cone is defined as K∗ = {x| ⟨x;y⟩ ≥ 0;∀ y ∈K} (2.21) where ⟨·; ·⟩ denotes the inner product operation. In other words, the dual cone K = K∗, which is always convex =-=[23]-=-. It can be shown that the nonnegative orthant cone, the second-order cone and the symmetric positive semidefinite matrix cone are all self-dual (an object has the property that it is equal to its own... |

2913 | Capacity of multi-antenna Gaussian channels
- Telatar
- 1995
(Show Context)
Citation Context ...a Gaussian MIMO channel whose input-output relationship is given by (2.1). In coherent communications, assuming the channel H is perfectly known at the receiver. Given H, the capacity is expressed as =-=[20]-=- C(H) =max p(s) I(s;y) = max Q≽0;tr{Q}≤PT log2det(InR + 1 σ2 HQHH); (2.10) where p(s) denotes the input distribution, I(·; ·) denotes the mutual information between channel input and channel output, P... |

2429 |
Wireless communications, principles and practice
- Rappaport
- 1996
(Show Context)
Citation Context ...lR × ndlR matrices R jegdl for destinations j = 1; : : :Mdl , are determined according to path loss from uniformly distributed users ranging from 250 to 750 meters according to 48 the lognormal model =-=[56]-=- PL= PL0+10ζ log10 d d0 (3.58) where path loss exponent ζ = 2:5, and reference distance d0 = 500m. In (3.58), it is assumed that the effects of small scale fading are averaged out. (The reference powe... |

2121 | A simple transmit diversity technique for wireless communications
- Alamouti
- 1998
(Show Context)
Citation Context ...uency diversity since it does not incur an expenditure in transmission time/bandwidth. Space-time coding to exploit spatial diversity gain in point-to-point MIMO channels has been studied extensively =-=[5]-=- [6]. Considering the rapidly increasing demand for high data rate and reliable wireless communications, bandwidth efficient transmission schemes are of great importance. In recent years, user coopera... |

2004 | Cooperative diversity in wireless networks: efficient protocols and outage behavior
- Laneman, Tse, et al.
- 2004
(Show Context)
Citation Context ... messages for each other, mobile terminals can provide the final destination receiver with multiple replicas of a signal arriving via different paths. These techniques, known as cooperative diversity =-=[7]-=- [8], are shown to significantly improve network performance through mitigating the detrimental effects of signal fading. Various schemes have been proposed to achieve spatial diversity through user c... |

1778 | Space-time codes for high data rate wireless communication: Performance criterion and code construction
- Tarokh, Seshadri, et al.
- 1998
(Show Context)
Citation Context ...y diversity since it does not incur an expenditure in transmission time/bandwidth. Space-time coding to exploit spatial diversity gain in point-to-point MIMO channels has been studied extensively [5] =-=[6]-=-. Considering the rapidly increasing demand for high data rate and reliable wireless communications, bandwidth efficient transmission schemes are of great importance. In recent years, user cooperation... |

1363 | Using sedumi 1.02, a matlab toolbox for optimization over symmetric cones. Optimization Methods and Software
- Sturm
- 1999
(Show Context)
Citation Context ...omes min Zul Tr(ZulDul) (4.20) s:t: Tr(ZulUul;k)≥ γul;kσ2ul;nfTul;kf∗ul;k for k = 1; : : : ;Mul; Zul ≽ 0: This optimization problem can be efficiently solved using optimization software, e.g., Sedumi =-=[63]-=- by introducing slack variables βul;k;k = 1; : : : ;Mul to transform (4.20) into standard SDP form 64 in Sedumi as follows: min Zul∈Cn ul R ×nulR vec(Dul)Tvec(Zul) (4.21) s:t: vec(Uul;k)vec(Zul)−βul;k... |

1192 |
Capacity theorems for the relay channel
- Cover, Gamal
- 1979
(Show Context)
Citation Context ...d the capacity of the MIMO channel from the multi-antenna relay to the base station. Proof: It is an obvious cut-set upper bound so that it can be established from arguments similar to Corollary 1 in =-=[96]-=-. The joint optimization process can be intuitively interpreted as an iterative process of matched filtering plus waterfilling at the users and at the relay to align the users-to-relay and relay-to-ba... |

1005 |
An introduction to signal detection and estimation
- Poor
(Show Context)
Citation Context ...f between performance and complexity have been investigated. Examples of nonlinear suboptimal detectors are the sphere detector [14] and detectors which combine linear processing with local ML search =-=[15]-=-. The linear suboptimal detectors usually used in practice are zero-forcing (ZF) and minimum mean-squared error (MMSE) detectors [13, 16, 17]. Data detection for MIMO systems is similar to multiuser d... |

707 |
Introduction to space-time wireless communications, 1st ed
- Paulraj, Nabar, et al.
- 2003
(Show Context)
Citation Context ...rence 2 [2]. Space-division multiple access (SDMA) emerged as a popular technique for next-generation communication systems and has appeared in standards such as IEEE 802.16x and 3GPP LTE. Array gain =-=[3]-=- is achieved in MIMO systems through the enhancement of average signal-to-noise ratio (SNR) owing to transmission and reception by multiple antennas. Availability of channel state information (CSI) at... |

620 | Distributed space-time-coded protocols for exploiting cooperative diversity in wireless networks
- Laneman, Wornell
- 2003
(Show Context)
Citation Context ...sages for each other, mobile terminals can provide the final destination receiver with multiple replicas of a signal arriving via different paths. These techniques, known as cooperative diversity [7] =-=[8]-=-, are shown to significantly improve network performance through mitigating the detrimental effects of signal fading. Various schemes have been proposed to achieve spatial diversity through user coope... |

507 | How much training is needed in multipleantenna wireless links
- Hassibi, Hochwald
- 2003
(Show Context)
Citation Context ...nd RR are assumed to be full-rank. Since RT and RR are full-rank and assumed to be known, channel estimation is performed on Hw using the well-established orthogonal training method described in [24] =-=[25]-=- [26] [27] [28] . At the receive antennas, the received signal matrix Ytr with dimension Nr×Ttr, received in nT time slots, Ytr =HStr+Ntr = R 1=2 R HwR 1=2 T Str+Ntr (2.25) where Str is the transmitte... |

445 | Fading Relay Channels: Performance Limits and Space-Time Signal Design
- Nabar, Bolcskei, et al.
(Show Context)
Citation Context ... to significantly improve network performance through mitigating the detrimental effects of signal fading. Various schemes have been proposed to achieve spatial diversity through user cooperation [7] =-=[9]-=-. The most popular schemes are amplify-and-forward (AF), decode-and-forward (DF), and coded cooperation [10]. A distributed beamforming system with a single transmitter and receiver and multiple relay... |

417 | Capacity limits of MIMO channels
- Goldsmith, Jafar, et al.
- 2003
(Show Context)
Citation Context ...) ≥ f ( Γ( j);W( j) ) ; (6.30) hence f ( Γ( j);W( j) ) is a nondecreasing function for iteration j. As the system is power constrained at the relay and users, Cul;Γ;W is upper-bounded as indicated in =-=[95]-=-, hence the iterative algorithm converges. End of proof. Lemma 6.2: The capacity of the uplink cooperative channel is upper-bounded by the minimum of the capacity of the multiple access channel from t... |

378 | Detection algorithm and initial laboratory results using V-BLAST space–time communication architecture,” Electron
- Golden, Foschini, et al.
- 1999
(Show Context)
Citation Context ... 9 Chapter 2 Background 2.1 MIMO Data Processing Consider a MIMO link with Nt transmit and Nr receive antennas, denoted as (Nt ;Nr). The baseband model of the received signal vector y is expressed as =-=[13]-=- y=Hs+n (2.1) where H is the Nr×Nt channel matrix, and s is the Nt×1 transmitted signal vector. The Nr×1 noise vector n is assumed to be circularly symmetric complex Gaussian with zero-mean and covari... |

313 | Iterative water-filling for Gaussian vector multiple-access channels,''
- Yu, Rhee, et al.
- 2004
(Show Context)
Citation Context ...nul;ba )−1=2 Hul;mu; j (6.8) where Γ(k−1)i is the beamforming matrix for ith user at the (k−1)th iteration. Repeat Step 2 until the desired accuracy is reached. In Step 2, waterfilling algorithm [92] =-=[94]-=- can be applied to obtain Γ(k)j . 6.3.2 Relay Beamforming Matrix Optimization With Fixed User Transmit Beamforming Matrices In this part, we assume given a user transmit beamforming matrix and optimiz... |

263 | T.W.: Introduction to Adaptive Arrays, - Monzingo, Miller - 1980 |

234 | Space-time processing for wireless communications,” - Paulraj, Papadias - 1997 |

234 | Lattice codes decoder for space-time codes
- Damen, Chkeif, et al.
- 2000
(Show Context)
Citation Context ... receiver, various suboptimal receivers which yield a reasonable tradeoff between performance and complexity have been investigated. Examples of nonlinear suboptimal detectors are the sphere detector =-=[14]-=- and detectors which combine linear processing with local ML search [15]. The linear suboptimal detectors usually used in practice are zero-forcing (ZF) and minimum mean-squared error (MMSE) detectors... |

225 | Distributed space-time coding in wireless relay networks
- Jing, Hassibi
- 2006
(Show Context)
Citation Context ...10]. Recently, the amplify-and-forward approach has been extended to develop space-time coding strategies for relay networks, which opens a new research avenue called 57 distributed space-time coding =-=[57]-=- [58]. A distributed beamforming system with a single transmitter and receiver and multiple relay nodes are studied in [11], and second order statistics of the channel are employed to design the optim... |

217 |
Solution of the multiuser downlink beamforming problem with individual SINR constraints
- Schubert, Boche
- 2004
(Show Context)
Citation Context ...;kg T dl;kW H dlHdltdl;k ∑Mdlj=1; j ̸=k t H dl; jH H dlWdlg∗dl;kg T dl;kW H dlHdltdl; j+Pkdl;n ≥ γdl;k for k = 1;2; : : : ;Mdl: (3.10) Problem (3.10) can be transformed as follows [51] [44] [11] [52] =-=[53]-=-: defining matrices Tdl;i = tdl;itdl;iH ; i= 1;2; : : : ;Mdl (3.11) and dropping the rank-one constraints of the Tdl;i, (3.10) becomes min Tdl;1;Tdl;2;:::;Tdl;Mdl Mdl ∑ k=1 Tr(Tdl;k) s:t: Tr(Udl;k(Tdl... |

207 |
Shannon-theoretic approach to a Gaussian cellular multiple-access channel
- Wyner
- 1994
(Show Context)
Citation Context ...cess information from all the base stations and to determine the precoders at each base station to transmit the appropriate signals. Previous work on multiple cell processing were for the uplink [68] =-=[69]-=-. Both these papers considered a simple linear array model for a cellular network. Wyner [69] also proposed and analyzed a hexagonal array model. Multicell processing is sometimes called ”macrodiversi... |

200 | Coded Cooperation in Wireless Communications: Space-time transmission and iterative decoding
- Janani, Hedayat, et al.
- 2004
(Show Context)
Citation Context ...Various schemes have been proposed to achieve spatial diversity through user cooperation [7] [9]. The most popular schemes are amplify-and-forward (AF), decode-and-forward (DF), and coded cooperation =-=[10]-=-. A distributed beamforming system with a single transmitter and receiver and multiple relay nodes are studied in [11], and second order statistics of the channel are employed to design the optimal be... |

182 |
Network coordination for spectrally efficient communications in cellular systems
- Karakayali, Foschini, et al.
- 2006
(Show Context)
Citation Context ...research for many years. Recently, there has been a rapidly growing interest in the area of multicell processing, in which base stations cooperate to provide networkwide, macroscopic beamforming [66] =-=[67]-=-. The conceptual approach to multicell processing is to assume a central coordinating unit, to which the base stations are connected. The central controller’s role is to process information from all t... |

180 |
On the capacity of MIMO relay channels
- Wang, Zhang, et al.
- 2005
(Show Context)
Citation Context ...19 Figure 2.1. MIMO relay system [1] with K relays each equipped with N antennas. 2.5 MIMO Relay Channel Capacity bound Channel capacity for cooperative systems has been studied in the literature. In =-=[29]-=-, a cooperative system with one relay between source and destination and direct link between source and destination is studied, with corresponding upper and lower bounds derived. In [1], both an asymp... |

159 | Optimal design of non-regenerative MIMO wireless relays
- Tang, Hua
- 2007
(Show Context)
Citation Context ...filling algorithm in the spatial domain is proposed showing a gain in throughput. A cooperative system with a multi-antenna source, a multi-antenna relay and a multi-antenna destination is studied in =-=[86]-=-, where an optimal solution was found when no direct link exists. For a multiple-antenna relay channel, the full-duplex cut-set capacity upper bound and decode-and-forward rate are formulated as conve... |

152 | Linear precoding via conic optimization for fixed MIMO receivers
- Wiesel, Eldar, et al.
- 2006
(Show Context)
Citation Context ...in LTE Advanced [30] [31] [32]. To limit in-band interference, it is important to limit the transmission power at both base stations and relays, which is the topic to be addressed in this chapter. In =-=[33]-=-, the design of linear precoders broadcasting to given MIMO receivers using signalto-noise plus interference (SINR) constraints is considered. Linear minimum mean-squared error (LMMSE) precoding/decod... |

149 |
Capacity scaling laws in MIMO relay networks,”
- Bolcskei, Nabar, et al.
- 2006
(Show Context)
Citation Context ...c upper bound of the achievable SINR at the kth user: 126 E Proof of the convergence of uplink iterative algorithm 128 F Derivation of Second Derivatives 130 vii List of Figures 2.1 MIMO relay system =-=[1]-=- with K relays each equipped with N antennas. . . . . . . . . 20 3.1 Downlink distributed beamforming system. . . . . . . . . . . . . . . . . . . . . . . 25 3.2 Comparison of minimum total source tran... |

126 | Joint optimal power control and beamforming in wireless networks using antenna arrays
- Ra'lhid-Farrokhi, Tassiulas, et al.
- 1998
(Show Context)
Citation Context ... ∗ dl;kg T dl;kW H dlHdltdl;k ∑Mdlj=1; j ̸=k t H dl; jH H dlWdlg∗dl;kg T dl;kW H dlHdltdl; j+Pkdl;n ≥ γdl;k for k = 1;2; : : : ;Mdl: (3.10) Problem (3.10) can be transformed as follows [51] [44] [11] =-=[52]-=- [53]: defining matrices Tdl;i = tdl;itdl;iH ; i= 1;2; : : : ;Mdl (3.11) and dropping the rank-one constraints of the Tdl;i, (3.10) becomes min Tdl;1;Tdl;2;:::;Tdl;Mdl Mdl ∑ k=1 Tr(Tdl;k) s:t: Tr(Udl;... |

105 | Transmit beamforming for physical-layer multicasting
- Sidiropoulos, Davidson, et al.
- 2006
(Show Context)
Citation Context ...one solution, e.g., when Mdl ≤ 3, then the relay weights can be obtained as the eigenvector corresponding to the largest eigenvalue of the rank-one matrix. Otherwise apply the randomization method in =-=[55]-=- to obtain the DRBF vector (See Appendix B or details). 5. If the relay sum power is sufficiently close to a fixed point, or else if a predetermined number of iterations is exceeded, then stop. Otherw... |

99 |
Cochannel interference mitigation and cooperatively processing in downlink multicell multiuser
- Zhang, Dai
- 2004
(Show Context)
Citation Context ...raphic area. Theoretically, macrodiversity can eliminate the impact of other cell interference on cellular capacity [71], [68]. The potential capacity gain is, therefore, enormous, as demonstrated in =-=[72]-=-, [71], and [73]. A low-complexity physical layer design to introduce cooperation in the downlink of an infrastructure-based multicell MIMO-OFDM is developed in [74], performance insights and analytic... |

86 | Network beamforming using relays with perfect channel information,” Information Theory
- Jing, Jafarkhani
- 2009
(Show Context)
Citation Context ...ower allocation for cooperative system has been studied in [41]. Transmission techniques for broadcast channels have been extended to cooperative networks. Relays cooperatively transmit to a receiver =-=[42]-=-, where amplitudes and phases of transmitted signals are coherently combined. In [43], rate maximization for a parallel relay network with noise correlation is studied. A distributed beamforming syste... |

77 |
Coordinating multiple antenna cellular networks to achieve enormous spectral efficiency
- Foschini, Karakayali, et al.
- 2006
(Show Context)
Citation Context ...nal to a mobile, in which the multiple base stations are widely spaced across a geographic area. Theoretically, macrodiversity can eliminate the impact of other cell interference on cellular capacity =-=[71]-=-, [68]. The potential capacity gain is, therefore, enormous, as demonstrated in [72], [71], and [73]. A low-complexity physical layer design to introduce cooperation in the downlink of an infrastructu... |

75 | Transceiver optimization for multiuser MIMO systems
- Serbetli, Yener
- 2004
(Show Context)
Citation Context ...assumed to be full-rank. Since RT and RR are full-rank and assumed to be known, channel estimation is performed on Hw using the well-established orthogonal training method described in [24] [25] [26] =-=[27]-=- [28] . At the receive antennas, the received signal matrix Ytr with dimension Nr×Ttr, received in nT time slots, Ytr =HStr+Ntr = R 1=2 R HwR 1=2 T Str+Ntr (2.25) where Str is the transmitted Ttr×Ttr ... |

71 |
Optimal and suboptimal transmit beamforming
- Bengtsson, Ottersten
- 2001
(Show Context)
Citation Context ...Hdl;kH H dlWdlg ∗ dl;kg T dl;kW H dlHdltdl;k ∑Mdlj=1; j ̸=k t H dl; jH H dlWdlg∗dl;kg T dl;kW H dlHdltdl; j+Pkdl;n ≥ γdl;k for k = 1;2; : : : ;Mdl: (3.10) Problem (3.10) can be transformed as follows =-=[51]-=- [44] [11] [52] [53]: defining matrices Tdl;i = tdl;itdl;iH ; i= 1;2; : : : ;Mdl (3.11) and dropping the rank-one constraints of the Tdl;i, (3.10) becomes min Tdl;1;Tdl;2;:::;Tdl;Mdl Mdl ∑ k=1 Tr(Tdl;... |

67 | Distributed beamforming for relay networks based on second-order statistics of the channel state information
- Havary-Nassab, Shahbazpanahi, et al.
- 2008
(Show Context)
Citation Context ...emes are amplify-and-forward (AF), decode-and-forward (DF), and coded cooperation [10]. A distributed beamforming system with a single transmitter and receiver and multiple relay nodes are studied in =-=[11]-=-, and second order statistics of the channel are employed to design the optimal beamforming weights at the relays. In the communication industry, spectrum efficiency is a critical performance metric d... |

63 | On channel estimation and optimal training design for amplify and forward relay networks,”
- Gao, Cui, et al.
- 2008
(Show Context)
Citation Context ... RT and RR are assumed to be full-rank. Since RT and RR are full-rank and assumed to be known, channel estimation is performed on Hw using the well-established orthogonal training method described in =-=[24]-=- [25] [26] [27] [28] . At the receive antennas, the received signal matrix Ytr with dimension Nr×Ttr, received in nT time slots, Ytr =HStr+Ntr = R 1=2 R HwR 1=2 T Str+Ntr (2.25) where Str is the trans... |

60 |
Information-theoretic capacity of multi-receiver networks
- Hanly, Whiting
- 1993
(Show Context)
Citation Context ...o process information from all the base stations and to determine the precoders at each base station to transmit the appropriate signals. Previous work on multiple cell processing were for the uplink =-=[68]-=- [69]. Both these papers considered a simple linear array model for a cellular network. Wyner [69] also proposed and analyzed a hexagonal array model. Multicell processing is sometimes called ”macrodi... |

58 | Complex matrix decomposition and quadratic programming
- Huang, Zhang
- 2007
(Show Context)
Citation Context ...xation can be employed by solving a relaxed version of (3.20). It is noted here that in general cases, rank-1 solution does not always exists. However, in particular case whenMdl ≤ 3, it is proven in =-=[54]-=- that the relaxed problem has optimal rank-1 solution. That is, by defining Zdl , wdlwHdl , and dropping constraint rank(Zdl) = 1, (3.20) becomes min Zdl Tr(ZdlDdl) (3.21) s:t: Tr ( Zdl(Edl;k− γdl;kFd... |

50 | MIMO Relaying with Linear Processing for Multi-user Transmission in Fixed Relay Networks,”
- Chae, Tang, et al.
- 2008
(Show Context)
Citation Context ...osed form based on convex optimization techniques, aiming to minimize the weighted mean squared error (MSE) was developed in [90]. A multiuser multi-antenna downlink cooperative system was studied in =-=[91]-=-, upper and lower bounds for sum rate was proposed. 92 An obvious trend in the communication industry is to increase spectrum efficiency deploying more antennas at the base station as well as at user ... |

46 |
Simplified Processing for Wireless Communications at High Spectral Efficiency
- Foschini, Golden, et al.
- 1999
(Show Context)
Citation Context ...and detectors which combine linear processing with local ML search [15]. The linear suboptimal detectors usually used in practice are zero-forcing (ZF) and minimum mean-squared error (MMSE) detectors =-=[13, 16, 17]-=-. Data detection for MIMO systems is similar to multiuser detection for synchronous users [15], where in MIMO systems we consider one user having multiple transmitting antennas and in multi-user detec... |

44 | Grassmannian beamforming for mimo amplify-and-forward relaying,”
- Khoshnevis, Yu, et al.
- 2008
(Show Context)
Citation Context ...posed in [45] that has the advantages of limited feedback and improved diversity. The problem of quantized CSI feedback in multiple-input multiple output (MIMO) AF relay systems has been addressed in =-=[46]-=- using beamforming code books designed based on Grassmanian manifolds, perfect CSI is also assumed at the receiver. As overall precoder-DBRF optimization to achieve minimum-power objectives is complex... |

42 |
LTE-The UMTS Long Term Evolution, from theory to practice, 1st ed.
- Sesia, Toufik, et al.
- 2009
(Show Context)
Citation Context ... and capacity while limits transmission power is cooperative communication involving relaying. Relay system based on orthogonal frequency division multiplexing access (OFMDA) has been in LTE Advanced =-=[30]-=- [31] [32]. To limit in-band interference, it is important to limit the transmission power at both base stations and relays, which is the topic to be addressed in this chapter. In [33], the design of ... |

35 |
A fast square-root implementation for BLAST
- Hassibi
- 2000
(Show Context)
Citation Context ...H†R−1H). It is easy to see that soft MMSE estimate s̃MMSE is a biased estimate of s from (2.7). 12 For spatially white noise withR= INr , the estimate in (2.7) is reduced to s̃MMSE= ( INt +H†H )−1H†y =-=[19]-=-. 2.2 MIMO Channel Capacity Consider a Gaussian MIMO channel whose input-output relationship is given by (2.1). In coherent communications, assuming the channel H is perfectly known at the receiver. G... |

34 |
Partially-coherent distributed spacetime codes with differential encoder and decoder
- Kiran, Rajan
- 2007
(Show Context)
Citation Context ...Recently, the amplify-and-forward approach has been extended to develop space-time coding strategies for relay networks, which opens a new research avenue called 57 distributed space-time coding [57] =-=[58]-=-. A distributed beamforming system with a single transmitter and receiver and multiple relay nodes are studied in [11], and second order statistics of the channel are employed to design the optimal be... |

31 | Goldsmith “MIMO Capacity with Channel Uncertainty: Does Feedback Help?,” - Yoo, Yoon, et al. - 2004 |

30 |
Joint linear transmitter and receiver design for the downlink of multiuser MIMO systems
- Zhang, Wu, et al.
- 2005
(Show Context)
Citation Context ...lto-noise plus interference (SINR) constraints is considered. Linear minimum mean-squared error (LMMSE) precoding/decoding design has been studied for the uplink in [27], and for the downlink in [34] =-=[35]-=-. Transceiver design that takes imperfect channel state information into account has also been studied [27] [36] [37]. To date, the design problems concerning relay assignment have been examined mainl... |

30 |
Further results on approximating nonconvex quadratic optimization by semidefinite programming relaxation
- Tseng
- 2003
(Show Context)
Citation Context ...In this later situation, the optimal matrix obtained from (4.21) is used to generate some suboptimal weight vectors χul (See Appendix B or details), from which the best solution will be selected [64] =-=[65]-=- [55] . 4.4.2 Feasibility For a given set of SINR constraints, the feasibility of (4.14) can be tested. It is summarized as follows: Lemma 4.1: If the number of receive antennas at the base station is... |

25 | Relay selection with outdated channel estimates
- Michalapoulos, Suraweera, et al.
- 2010
(Show Context)
Citation Context ...oncerning relay assignment have been examined mainly for single-user scenarios with focus on the outage probability analysis of the best 22 relay for transmission or for reception and bottleneck link =-=[38]-=- [39]. Multi-user multi-relay wireless networks with single-carrier frequency division multiple access (SC-FDMA) at the terminals is studied in [40]. Joint relay selection and power allocation for coo... |

25 |
Multiple peerto-peer communications using a network of relays
- Fazeli-Dehkordy, Shahbazpanahi, et al.
- 2009
(Show Context)
Citation Context ... of the channel are employed to design the optimal distributed relay beamformer (DRBF). Single-antenna source-destination pairs that communicate peer-to-peer through a relay network are considered in =-=[44]-=-, and the DRBF problem is formulated in terms of semi-definite programming (SDP) and solved through semi-definite relaxation. Unfortunately, the requirement for accurate channel state information (CSI... |

23 |
Iterative water-filling for vector multiple access channels
- Yu, Rhee, et al.
(Show Context)
Citation Context ...e vector multiple access channel capacity maximization problem. After noise-whitening, this problem can be optimally solved by the multiple access iterative waterfilling algorithm proposed by Yu [92] =-=[93]-=- as follows: Step 1: initialize S(1)i = 0; i= 1; : : : ;Mul . Step 2: repeat for kth iteration, k > 1 95 Γ(k)j = argmax Γ j 1 2 log|H̃ul;mu; jΓ jH̃Hul;mu; j+ I| for j = 1; : : : ;Mul (6.7) where H̃ul;... |

22 |
Spectral efficiency of joint multiple cell-site processors for randomly spread ds-cdma systems,”
- Somekh, Zaidel, et al.
- 2007
(Show Context)
Citation Context ...a of research for many years. Recently, there has been a rapidly growing interest in the area of multicell processing, in which base stations cooperate to provide networkwide, macroscopic beamforming =-=[66]-=- [67]. The conceptual approach to multicell processing is to assume a central coordinating unit, to which the base stations are connected. The central controller’s role is to process information from ... |

22 | The optimality of beamforming in uplink multiuser wireless systems
- Rhee, Yu, et al.
- 2004
(Show Context)
Citation Context ...-noise vector multiple access channel capacity maximization problem. After noise-whitening, this problem can be optimally solved by the multiple access iterative waterfilling algorithm proposed by Yu =-=[92]-=- [93] as follows: Step 1: initialize S(1)i = 0; i= 1; : : : ;Mul . Step 2: repeat for kth iteration, k > 1 95 Γ(k)j = argmax Γ j 1 2 log|H̃ul;mu; jΓ jH̃Hul;mu; j+ I| for j = 1; : : : ;Mul (6.7) where ... |

21 |
Effect of channel uncertainty on the mutual information of MIMO fading channels
- Musavian, Nakhai, et al.
- 2007
(Show Context)
Citation Context ... are assumed to be full-rank. Since RT and RR are full-rank and assumed to be known, channel estimation is performed on Hw using the well-established orthogonal training method described in [24] [25] =-=[26]-=- [27] [28] . At the receive antennas, the received signal matrix Ytr with dimension Nr×Ttr, received in nT time slots, Ytr =HStr+Ntr = R 1=2 R HwR 1=2 T Str+Ntr (2.25) where Str is the transmitted Ttr... |

21 |
Downlink sumMSE transceiver optimization for linear multi-user MIMO systems
- Schubert, Shi, et al.
- 2005
(Show Context)
Citation Context ...signalto-noise plus interference (SINR) constraints is considered. Linear minimum mean-squared error (LMMSE) precoding/decoding design has been studied for the uplink in [27], and for the downlink in =-=[34]-=- [35]. Transceiver design that takes imperfect channel state information into account has also been studied [27] [36] [37]. To date, the design problems concerning relay assignment have been examined ... |

20 | Linear precoding designs for amplifyand-forward multiuser two-way relay systems,”
- Wang, Tao, et al.
- 2012
(Show Context)
Citation Context ...lti-antenna base station (BS) conducts bi-directional communications with multiple mobile stations (MSs) via a multi-antenna relay station (RS) with amplify-and-forward relay strategy is developed in =-=[60]-=-. The work in [60] shows that the BS precoding design with the RS precoder fixed can be converted to a standard second order cone programming (SOCP) and the optimal solution is obtained efficiently wi... |

20 | Fairnessaware radio resource management in downlink OFDMA cellular relay networks,”
- Salem, Adinoyi, et al.
- 2010
(Show Context)
Citation Context ...ncy was proposed. A comprehensive centralized RRM algorithm for downlink OFDMA cellular fixed relay networks in a way to ensure user fairness with minimal impact on network throughput was proposed in =-=[78]-=-, the proposed centralized scheme has improvement in terms of the substantial savings in complexity and feedback overhead compared with traditional centralized schemes. A shared relaying architecture ... |

19 | Integrated Radio Resource Allocation for Multihop Cellular Networks with Fixed Relay stations,”
- Liu, Hoshyar, et al.
- 2006
(Show Context)
Citation Context ...y through system level simulation. A heuristic algorithm named integrated radio resource allocation (IRRA) with a mode-aware BS resource-scheduling scheme to find suboptimal solutions was proposed in =-=[80]-=- and shown to have improvement in cell throughput. The role of the receive antennas in a multi-cell environment is discussed and recently proposed multicell cooperative algorithms and receive antenna ... |

13 |
LTE for 4G Mobile Broadband.
- Khan
- 2009
(Show Context)
Citation Context ...ity while limits transmission power is cooperative communication involving relaying. Relay system based on orthogonal frequency division multiplexing access (OFMDA) has been in LTE Advanced [30] [31] =-=[32]-=-. To limit in-band interference, it is important to limit the transmission power at both base stations and relays, which is the topic to be addressed in this chapter. In [33], the design of linear pre... |

13 | Distributed beamforming and power allocation for cooperative networks,”
- Ding, Chin, et al.
- 2008
(Show Context)
Citation Context ... accurate channel state information (CSI) and the distributed nature of wireless sensor/relay networks complicate transmit beamforming. A distributed beamforming scheme with two relays is proposed in =-=[45]-=- that has the advantages of limited feedback and improved diversity. The problem of quantized CSI feedback in multiple-input multiple output (MIMO) AF relay systems has been addressed in [46] using be... |

11 | On uplink-downlink duality of multihop MIMO relay channel
- Rong, Khandaker
- 2011
(Show Context)
Citation Context ...rsity. The duality between uplink and downlink multi-hop AF-MIMO relay channels with any number of hops and any number of antennas at each node for single node relaying in each hop was established in =-=[59]-=- for single relay. A study of linear precoding designs for a cellular multi-user system where a multi-antenna base station (BS) conducts bi-directional communications with multiple mobile stations (MS... |

9 | Timing and carrier synchronization with channel estimation in multi-relay cooperative networks
- Nasir, Mehrpouyan, et al.
- 2012
(Show Context)
Citation Context ...d iterative algorithm successively minimizes the transmission power at the base station and sum power at the relays. The approach is then generalized to take imperfect CSI into account. As studied in =-=[47]-=-, for cooperative multi-relay systems, synchronization is a real challenge for narrow-band single carrier systems as the 23 transmitters and receivers are distributed in space due to propagation delay... |

9 | Transmit signal and bandwidth optimization in Multiple-Antenna Relay Channels
- Ng, Foschini
- 2011
(Show Context)
Citation Context ... was found when no direct link exists. For a multiple-antenna relay channel, the full-duplex cut-set capacity upper bound and decode-and-forward rate are formulated as convex optimization problems in =-=[87]-=-. For halfduplex relaying, bandwidth allocation and transmit signals are optimized jointly. The capacity and beamforming optimality of multi-antenna relaying systems was investigated in [88], where st... |

6 | A practical cooperative multicell MIMO-OFDMA network based on rank coordination
- Clerckx, Lee, et al.
- 2013
(Show Context)
Citation Context ...r probability for linear receivers are provided. A novel and practical type of coordination for OFDMA downlink networks relying on multiple antennas at the transmitter and the receiver is proposed in =-=[75]-=-. The transmission ranks, i.e., the number of transmitted streams, and the user scheduling in all cells are jointly optimized in order to maximize a network utility function accounting for fairness am... |

6 |
Multicell cooperative systems with multiple receive antennas,”
- Hwang, Chae, et al.
- 2013
(Show Context)
Citation Context ...e receive antennas in a multi-cell environment is discussed and recently proposed multicell cooperative algorithms and receive antenna techniques for different interference statistics are reviewed in =-=[81]-=-. When the signals from multiple cells are amplified by a group of relays, the interference from other cells becomes mixed and less amenable with the addition of relay noises. In this chapter, the fra... |

6 |
Letaief, “Ergodic capacity and beamforming optimality for multi-antenna relaying with statistical CSI
- Dharmawansa, McKay, et al.
- 2011
(Show Context)
Citation Context ...oblems in [87]. For halfduplex relaying, bandwidth allocation and transmit signals are optimized jointly. The capacity and beamforming optimality of multi-antenna relaying systems was investigated in =-=[88]-=-, where statistical channel information is assumed at the relay and source. The optimal transmission strategies at both the source and relay were developed and necessary and sufficient conditions for ... |

5 |
Distributed peer-to-peer multiplexing using ad hoc relay networks,” in
- Fazeli-Dehkordy, Gazor, et al.
(Show Context)
Citation Context ...econd order statistics of the channel are employed to design the optimal beamforming weights at the relays. Single antenna source destination pairs communicating through a relay network is studied in =-=[12]-=-, where relay weight optimization is formulated in terms of semidefinite programming (SDP) and solved through the semidefinite relaxation technique. A distributed beamforming scheme with two relays no... |

5 |
On the relation between
- Ginis, Cioffi
- 2001
(Show Context)
Citation Context ...and detectors which combine linear processing with local ML search [15]. The linear suboptimal detectors usually used in practice are zero-forcing (ZF) and minimum mean-squared error (MMSE) detectors =-=[13, 16, 17]-=-. Data detection for MIMO systems is similar to multiuser detection for synchronous users [15], where in MIMO systems we consider one user having multiple transmitting antennas and in multi-user detec... |

5 | Capacity of cell clusters with coordinated processing,”
- Vanelli-Coralli, PAdovani, et al.
- 2006
(Show Context)
Citation Context ...oretically, macrodiversity can eliminate the impact of other cell interference on cellular capacity [71], [68]. The potential capacity gain is, therefore, enormous, as demonstrated in [72], [71], and =-=[73]-=-. A low-complexity physical layer design to introduce cooperation in the downlink of an infrastructure-based multicell MIMO-OFDM is developed in [74], performance insights and analytical upper bounds ... |

5 |
Cooperative Amplify-and-Forward Beamforming with Multi-Antenna Source and Relays.
- Liang, Schober
- 2009
(Show Context)
Citation Context ... literature, multi-antenna relay systems have attracted strong interest. A cooperative system with a multiple antenna source, multiple multi-antenna relays and a single-antenna receiver is studied in =-=[83]-=-. However, the cooperative system is not efficient as multiple multi-antenna relays incur high system overhead for channel estimation and scheduling, and are very inefficient in scheduling just one us... |

4 | MIMO LMMSE transceiver design with imperfect CSI at both ends
- Ding, Blostein
(Show Context)
Citation Context ...oding design has been studied for the uplink in [27], and for the downlink in [34] [35]. Transceiver design that takes imperfect channel state information into account has also been studied [27] [36] =-=[37]-=-. To date, the design problems concerning relay assignment have been examined mainly for single-user scenarios with focus on the outage probability analysis of the best 22 relay for transmission or fo... |

4 | Optimal distributed beamforming in relay networks with common interference,” in
- Gomadam, Jafar
- 2007
(Show Context)
Citation Context ...ues for broadcast channels have been extended to cooperative networks. Relays cooperatively transmit to a receiver [42], where amplitudes and phases of transmitted signals are coherently combined. In =-=[43]-=-, rate maximization for a parallel relay network with noise correlation is studied. A distributed beamforming system with a single transmitter and receiver and multiple relay nodes is studied in [11],... |

4 |
Multiuser macrodiversity detection in asynchronous
- Welburn, Cavers, et al.
- 2004
(Show Context)
Citation Context ...th these papers considered a simple linear array model for a cellular network. Wyner [69] also proposed and analyzed a hexagonal array model. Multicell processing is sometimes called ”macrodiversity” =-=[70]-=-. In uplink macrodiversity, base stations cooperate to jointly decode a signal from a mobile in the network, taking advantage of the broadcast nature of wireless communications. In downlink macrodiver... |

4 |
Cooperative Randomized MIMO-OFDM Downlink for Multicell Networks: Design and Analysis
- Verde, Darsena, et al.
(Show Context)
Citation Context ...fore, enormous, as demonstrated in [72], [71], and [73]. A low-complexity physical layer design to introduce cooperation in the downlink of an infrastructure-based multicell MIMO-OFDM is developed in =-=[74]-=-, performance insights and analytical upper bounds on the symbol error probability for linear receivers are provided. A novel and practical type of coordination for OFDMA downlink networks relying on ... |

4 | Cooperative multiplexing: Toward higher spectral efficiency in multiple-antenna relay networks
- Fan, Wang, et al.
- 2009
(Show Context)
Citation Context ...nd a single antenna destination, the overhead is a factor of O(MNK) greater that of a cooperative system 91 with a single antenna at source, relay and destination. A cooperative scheme is proposed in =-=[84]-=- with a network of multi-antenna relays to serve a single user with AF or hybrid relaying. Similar to [83], this scheme proposed has high overhead and complexity but limited gain. For example, in the ... |

4 |
Optimal linear MMSE beamforming for two way multi-antenna relay systems
- Li, Wang, et al.
- 2011
(Show Context)
Citation Context ...akagami-m fading channels [89]. The optimal linear beamforming matrix in closed form based on convex optimization techniques, aiming to minimize the weighted mean squared error (MSE) was developed in =-=[90]-=-. A multiuser multi-antenna downlink cooperative system was studied in [91], upper and lower bounds for sum rate was proposed. 92 An obvious trend in the communication industry is to increase spectrum... |

2 |
Imperfect channel state information in MIMO transmission
- Weber, Sklavos, et al.
- 2006
(Show Context)
Citation Context ...g/decoding design has been studied for the uplink in [27], and for the downlink in [34] [35]. Transceiver design that takes imperfect channel state information into account has also been studied [27] =-=[36]-=- [37]. To date, the design problems concerning relay assignment have been examined mainly for single-user scenarios with focus on the outage probability analysis of the best 22 relay for transmission ... |

2 |
Exact analysis of dual-hop AF maximum end-to-end SNR relay selection
- Soliman, Beaulieu
- 2012
(Show Context)
Citation Context ...ning relay assignment have been examined mainly for single-user scenarios with focus on the outage probability analysis of the best 22 relay for transmission or for reception and bottleneck link [38] =-=[39]-=-. Multi-user multi-relay wireless networks with single-carrier frequency division multiple access (SC-FDMA) at the terminals is studied in [40]. Joint relay selection and power allocation for cooperat... |

2 |
A stochastic optimization approach for joint relay assignment and power allocation in orthogonal amplify-and-forward cooperative wireless networks
- Zheng, Zhang, et al.
- 2011
(Show Context)
Citation Context ...ss networks with single-carrier frequency division multiple access (SC-FDMA) at the terminals is studied in [40]. Joint relay selection and power allocation for cooperative system has been studied in =-=[41]-=-. Transmission techniques for broadcast channels have been extended to cooperative networks. Relays cooperatively transmit to a receiver [42], where amplitudes and phases of transmitted signals are co... |

2 |
Joint processing in multi-cell coordinated shared relay network
- Kim, Hwang, et al.
(Show Context)
Citation Context ...d demands new techniques for further improvement on throughput as well as coverage. Multi-cell coordinated shared relay with joint processing (JP) scheme in interference limited network is studied in =-=[77]-=-, JP of cooperating BSs and shared relay station (RS) in the relay transmission phase (second phase) using SVD precoding to increase resource usage efficiency was proposed. A comprehensive centralized... |

2 | Optimization of power constrained multisource uplink relay networks
- Zheng, Blostein
- 2009
(Show Context)
Citation Context ...j;iΩHco; j;iH H co; jWcogTco; j;ig∗co; j;iW H coHco; jΩco; j;i ∑(m;n)̸=( j;i)λco;m;nΩHco; j;iH H co;mWcogTco; j;ig∗co; j;iW H coHco;mΩco; j;i+α jΩHco; j;iΩco; j;i ≥ γco;i; j: (5.23) It has been shown =-=[82]-=- that the receive beamforming vector that maximize the SINR of the system is the principal eigenvector of (Aco;Bco), Ω̂co; j;i =℘(B−1co Aco); (5.24) where Aco =HHco; jWcogTco; j;ig∗co; j;iW H coHco; j... |

2 |
Algorithms for the MIMO single relay channel
- Kang, Rodoplu
- 2007
(Show Context)
Citation Context ...ingular vectors of the source-relay and relay-destination channels. A cooperative scheme with a direct link from source to destination and an indirect link through a multiantenna relay is proposed in =-=[85]-=-, where a waterfilling algorithm in the spatial domain is proposed showing a gain in throughput. A cooperative system with a multi-antenna source, a multi-antenna relay and a multi-antenna destination... |

2 |
Comprehensive error analysis of multi-antenna decode-and-forward relay in fading channels
- Datta, Chakrabarti, et al.
- 2012
(Show Context)
Citation Context ...ive analytical framework of dual-hop fixed decode-and-forward cooperative networks with multi-antenna relays and distributed spatial diversity is developed over generalized Nakagami-m fading channels =-=[89]-=-. The optimal linear beamforming matrix in closed form based on convex optimization techniques, aiming to minimize the weighted mean squared error (MSE) was developed in [90]. A multiuser multi-antenn... |

1 |
Jakes,Microwave mobile communications
- unknown authors
- 1974
(Show Context)
Citation Context ...) owing to transmission and reception by multiple antennas. Availability of channel state information (CSI) at the transmitter/receiver is necessary to realize transmit/receive array gains. Diversity =-=[4]-=- is a powerful technique to mitigate fading and increase robustness to interference. Diversity techniques rely on transmitting a data-bearing signal over multiple (ideally) independently fading paths ... |

1 |
Optimization of cooperative beamforming for SC-FDMA multi-user multi-relay networks by tractable D.C. programming
- Kha, Tuan, et al.
- 2013
(Show Context)
Citation Context ...r transmission or for reception and bottleneck link [38] [39]. Multi-user multi-relay wireless networks with single-carrier frequency division multiple access (SC-FDMA) at the terminals is studied in =-=[40]-=-. Joint relay selection and power allocation for cooperative system has been studied in [41]. Transmission techniques for broadcast channels have been extended to cooperative networks. Relays cooperat... |

1 |
Mobile standards and synchronization: 3gpp etc
- Ruffini
- 2011
(Show Context)
Citation Context ...egligible for LTE system. Hence, the synchronization is not a concern for OFDMA based wide-band systems. In this and following chapters, perfect synchronization across the system is assumed [48] [49] =-=[50]-=-. We also assume full CSI except in sections that focus on imperfect CSI. The remainder of the chapter is organized as follows: In Section 3.2, we present the system model. Linear precoder optimizatio... |

1 |
Nonlinear precoding design for MIMO amplify-and-forward two-way relay systems
- Wan
- 2012
(Show Context)
Citation Context ...ne programming (SOCP) and the optimal solution is obtained efficiently with the objective of total MSE. Nonlinear precoding design for MIMO amplifyand-forward (AF) two-way relay systems is studied in =-=[61]-=-, where nonlinear minimal mean square error (MMSE) decision feedback equalizers (DFEs) are used in two destinations, and linear transmit precoding is applied at the source and relay nodes. In the lite... |

1 |
Quadratic maximization and semidefinite relaxation,”Math. Program
- Zhang
- 2000
(Show Context)
Citation Context ...ion. In this later situation, the optimal matrix obtained from (4.21) is used to generate some suboptimal weight vectors χul (See Appendix B or details), from which the best solution will be selected =-=[64]-=- [65] [55] . 4.4.2 Feasibility For a given set of SINR constraints, the feasibility of (4.14) can be tested. It is summarized as follows: Lemma 4.1: If the number of receive antennas at the base stati... |

1 |
Energy and cost efficient mobile communication using multicell MIMO and relaying
- Fettweis, Laneman
- 2012
(Show Context)
Citation Context ...r scheduling in all cells are jointly optimized in order to maximize a network utility function accounting for fairness among users [75]. Relaying and multi-cell MIMO transmission are investigated in =-=[76]-=- as approaches for improving resource reuse and more flexible organization of cellular networks. Achievable throughput is analyzed under practical constraints using three different normalization appro... |

1 |
scheduling and resource allocation for wireless cellular network with shared relays
- Yu
(Show Context)
Citation Context ...gs in complexity and feedback overhead compared with traditional centralized schemes. A shared relaying architecture for intercell interference mitigation in wireless cellular networks is examined in =-=[79]-=- with focus on resource 76 allocation and the scheduling of users among the adjacent sectors. A network utility maximization problem was formulated for a realistic shared relaying network, where zero-... |