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## Signal Processing at Large in Wireless Networks Identifying “Knowledge Gaps” 0.1 Revision History (2004)

### Citations

1776 | Space-time codes for high data rate wireless communication: performance criterion and code construction,”IEEE Trans
- Tarokh, Seshadri, et al.
- 1998
(Show Context)
Citation Context ...nderstanding. Conversely, a sizable knowledge gap surrounds space-frequency code design, where both spatial and frequency diversity are jointly exploited. Although design criteria are readily devised =-=[59]-=-, no standard schemes have emerged so far. In particular, it would be desirable to have simple schemes that exploit a 13sprescribed order of spatial and frequency diversity, on top of which an arbitra... |

1036 |
Writing on dirty paper
- Costa
- 1983
(Show Context)
Citation Context ...hat is, we aim to adaptively give a shape to the codeword based on the shape of the transmission channel in order to approach the capacity of the channel. • Technion (05), Eurécom (22): – Dirty paper =-=[12]-=- coding techniques: these techniques are now very well recognized, as they play a fundamental role in approaching the capacity limits of a MIMO broadcast channel. Extensive research efforts have been ... |

359 | Linear multiuser receivers: Effective interference, effective bandwidth and user capacity
- Tse, Hanly
- 1999
(Show Context)
Citation Context ...he same rate, then it turns out that these indices converge toward deterministic quantities that depend only on the statistical properties of these matrices, and not on their particular realizations (=-=[62]-=-, [63]). The evaluation of these limits, based on large random matrix theory, free probability theory and replica analysis, lends considerable insight into the influence of the various relevant parame... |

322 |
Statistical signal processing: detection, estimation, and time series analysis
- Scharf
- 1991
(Show Context)
Citation Context ...ner filter [53] assume the detailed knowledge of second order statistics of the timevariant channel (see also Section 1.9). The same is true for subspace methods based on the Karhunen-Loeve transform =-=[54, 55]-=-. Consistent estimators for these statistics of a multi-access MIMO channel are not available because the number of channel observations is rather limited by the spatio-temporal stationarity of the ch... |

312 | Iterative water-filling for Gaussian vector multiple-access channels,''
- Yu, Rhee, et al.
- 2004
(Show Context)
Citation Context ... that the capacity region for a multiple access channels is known and practical solutions to approximate the capacity can be implemented (e.g., algorithms appealing to multi-user water-filling) [10], =-=[70]-=-, [65]. For cellular systems, however, where the frequencies of each cell have to be re-used by other cells, the optimum solution is still unclear. In order to achieve optimum cell spectral efficiency... |

310 | Spectral efficiency of CDMA with random spreading
- Verdú, Shamai
- 1999
(Show Context)
Citation Context ...e rate, then it turns out that these indices converge toward deterministic quantities that depend only on the statistical properties of these matrices, and not on their particular realizations ([62], =-=[63]-=-). The evaluation of these limits, based on large random matrix theory, free probability theory and replica analysis, lends considerable insight into the influence of the various relevant parameters o... |

274 | Turbo equalization: Principles and new results
- Tüchler, Koetter, et al.
- 2002
(Show Context)
Citation Context ...ich may employ iterative synchronization/equalization algorithms appealing to the turbo principle. Indeed, algorithm design thus far has assumed perfect channel state information. Some studies (e.g., =-=[61]-=-, [18]) have modified the outer processor when only partial channel state information is available. Design of optimal outer processors (in a maximum likelihood sense) is desired and sub-optimal versio... |

258 | Capacity scaling in mimo wireless systems under correlated fading
- CHUAH, TSE, et al.
(Show Context)
Citation Context ...nsional regime the impact of the channel distribution, in terms of correlations between transmit and/or receive antennas, line of sight components, in additional to frequency and/or time selectivity (=-=[11]-=-). Although some simple situations have been considered in the literature, significant work remains concerning more realistic situations such as CDMA, MC-CDMA and MIMO systems with correlated and/or R... |

208 |
A perspective on multi access channels
- Gallager
- 1985
(Show Context)
Citation Context ... do 32snot guarantee optimal performance, on must consider the joint design of network coding and channel coding. Random coding results for multiple-access channels with additive white Gaussian noise =-=[20]-=- reveal that the optimal coding strategy—i.e., either joint or single-user code design—is governed by the rates at which the users transmit. Although the users are not capable of cooperating, they can... |

182 | Capacity and Optimal Resource Allocation for Fading Broadcast Channels - Part I: Ergodic Capacity, Information Theory - Li, Goldsmith |

182 | OFDM with reduced peak-to-average power ratio by multiple signal representation
- Muller, Bauml, et al.
- 1997
(Show Context)
Citation Context ...decoder for arbitrary signal constellations and FFT sizes. A suited decoding metric is to be designed, and lowcomplexity versions similar to selected mapping and partial transmit sequences techniques =-=[41]-=- will be developed. • CNIT(32): Investigate families of codes that could be used for the “writing on a dirty paper” approach in a broadcast channel scenario (e.g., linear nested block codes). Comparis... |

139 | Capacity and mutual information of wideband multipath fading channels,
- Telatar, Tse
- 2000
(Show Context)
Citation Context ...dge gaps include (i) coherent design methodologies for scalable signal sets; and (ii) optimal detection strategies adapted to peaky signals over wideband multipath channels. Indeed, recent work [40], =-=[60]-=- shows that large bandwidths over fading multipath channels cannot be used effectively by systems that spread the transmitted signal power uniformly over both time and frequency. By contrast, peaky si... |

110 | Gaussian multiaccess channels with ISI: capacity region and multiuser water-filling
- Cheng, Verdu
- 1993
(Show Context)
Citation Context ...y note that the capacity region for a multiple access channels is known and practical solutions to approximate the capacity can be implemented (e.g., algorithms appealing to multi-user water-filling) =-=[10]-=-, [70], [65]. For cellular systems, however, where the frequencies of each cell have to be re-used by other cells, the optimum solution is still unclear. In order to achieve optimum cell spectral effi... |

105 | Multi-input multi-output fading channel tracking and equalization using Kalman estimation
- Komninakis, Fragouli, et al.
- 2002
(Show Context)
Citation Context ...eory backgrounds. Especially, for time-variant multiple-access MIMO channels the exploitation of the propagation characteristics become even more important. Channel estimation methods like the Kalman =-=[30]-=- or Wiener filter [53] assume the detailed knowledge of second order statistics of the timevariant channel (see also Section 1.9). The same is true for subspace methods based on the Karhunen-Loeve tra... |

105 | Bandwidth scaling for fading multipath channels
- Medard, Gallager
- 2002
(Show Context)
Citation Context ...knowledge gaps include (i) coherent design methodologies for scalable signal sets; and (ii) optimal detection strategies adapted to peaky signals over wideband multipath channels. Indeed, recent work =-=[40]-=-, [60] shows that large bandwidths over fading multipath channels cannot be used effectively by systems that spread the transmitted signal power uniformly over both time and frequency. By contrast, pe... |

95 | Analysis and design of ofdm/oqam systems based on filterbank theory, Signal Processing
- Siohan, Siclet, et al.
- 2002
(Show Context)
Citation Context ...ier transform algorithms. Compared to classical OFDM, however, the pre- and post-polyphase filters lead to additional computational complexity. As shown in the filter bank implementation described in =-=[57]-=-, though, nearly optimal results can be obtained with very short waveforms. A theoretical analysis [32] reveals that, for transmission over time- and frequency-dispersive channels, orthogonal waveform... |

80 | Asymptotically optimal water-filling in vector multiple-access channels,” Information Theory
- Viswanath, Tse, et al.
- 2001
(Show Context)
Citation Context ...the capacity region for a multiple access channels is known and practical solutions to approximate the capacity can be implemented (e.g., algorithms appealing to multi-user water-filling) [10], [70], =-=[65]-=-. For cellular systems, however, where the frequencies of each cell have to be re-used by other cells, the optimum solution is still unclear. In order to achieve optimum cell spectral efficiency, the ... |

63 | Simulation results for an interference-limited multiple-input multiple-output cellular system
- Catreux, Driessen, et al.
- 2000
(Show Context)
Citation Context ... give considerable increases in link capacity in noise limited systems. However, when a system is interference limited, it can no longer be assumed that MIMO will outperform receive antenna diversity =-=[5]-=-. When there are more antennas at the receiver than at the transmitter, interference suppression can be performed. As a result, when a channel is poor, receive antenna diversity will outperform MIMO, ... |

57 | Adaptive Minimum-BER Linear Multiuser Detection for DS CDMA Signals in Multipath Channels,”
- Chen, Samingan, et al.
- 2001
(Show Context)
Citation Context ...oblems arise. For example, the achievable performance depends strongly on the specific choice of spreading codes used and this deficiency has to be addressed in the context of rapidly fading channels =-=[8, 9, 51]-=-. 1.2.3 Blind Acquisition — Channel and Data Estimation For specific applications such as sensor networks, ad-hoc networks, short packet communications, and intelligent vehicular communication systems... |

55 | Latticereduction-aided broadcast precoding
- Windpassinger, Fischer, et al.
- 2004
(Show Context)
Citation Context ... channel state information by compensating round-trip delays via channel prediction. • UEN (30): Design and investigation of PAR reduction schemes based on lattice-reductionaided precoding techniques =-=[66]-=- and the application of a sphere decoder for arbitrary signal constellations and FFT sizes. A suited decoding metric is to be designed, and lowcomplexity versions similar to selected mapping and parti... |

53 | Adaptive minimum bit error rate beamformingssisted QPSK receiver,” in
- Chen, Hanzo, et al.
- 2004
(Show Context)
Citation Context ...ed MBER 10sprinciples are also applicable to employment in adaptive beamforming and utilizes the antenna array elements more intelligently, than the standard minimum mean square error (MMSE) approach =-=[7]-=-. Consequently, MBER beamforming is capable of providing significant performance gains in terms of a reduced bit error rate (BER) over MMSE beamforming. A block-data adaptive implementation of the the... |

51 |
Successive interference cancellation with SISO decoding and EM channel estimation,”
- Kobayashi, Boutros, et al.
- 2001
(Show Context)
Citation Context ...onse in turbo-equalization, or phase or frequency offsets in turbo-synchronisation. An promising approach to turbo-processing with partial CSI uses the EM algorithm for parameter re-estimation (e.g., =-=[31]-=-), which relates further to the advanced signal processing techniques of Section 1.8. Key knowledge gaps which impede present-day deployment therefore include: (i) convergence proofs and/or stability ... |

42 | Code performance as a function of block size
- Dolinar, Divsalar, et al.
- 1998
(Show Context)
Citation Context ...acity limits and error floors that incorporate short block lengths; and (ii) code classes which approach these capacity limits. Capacity limits versus block length can be obtained analytically (e.g., =-=[16]-=-) and nearly approached using certain classes of turbo codes. Equally important, however, is to gauge the error floors of practically encoded systems since, for robustness reasons, most practical syst... |

38 | Bounds on information combining
- Land, Huettinger, et al.
- 2005
(Show Context)
Citation Context ... and bound EXIT functions for linear codes in order to analyze the convergence behavior of iterative decoders. The recently introduced concept of bounding the combination of mutual information values =-=[34]-=- lead to bounds on information transfer functions for repetition codes, single parity-check codes, and applications to LDPC codes [58], [33]. The investigations focus on further generalizations and ap... |

35 | On the MIMO channel capacity of multidimensional signal sets
- Ng, Hanzo
- 2006
(Show Context)
Citation Context ...iplexing gain has a higher achievable capacity, than the corresponding MIMO system designed for achieving full diversity gain, provided that the channel SNR is sufficiently high. Given these formulae =-=[45]-=-, it is of high interest to develop wireless MIMO transceivers that are capable of approaching these capacity estimates. Novel multiuser CDMA receivers based on genetic algorithms have a high potentia... |

34 |
Extremes of information combining
- Sutskover, Shamai, et al.
- 2005
(Show Context)
Citation Context ... concept of bounding the combination of mutual information values [34] lead to bounds on information transfer functions for repetition codes, single parity-check codes, and applications to LDPC codes =-=[58]-=-, [33]. The investigations focus on further generalizations and applications. The research effort will be carried out by Ingmar Land and Prof. Bernard Fleury. Potential NEWCOM partners include Prof. J... |

31 |
Orthogonal frequency division multiplexing based on offset QAM,”
- Bolcskei
- 2003
(Show Context)
Citation Context ...in spectral efficiency. Another way to introduce pulse shaping without loss of orthogonality is to include a timeoffset when modulating each subcarrier. For instance, the Offset-QAM modulation format =-=[4]-=- has been used to get, in the real field, a set of orthogonal waveforms named IOTA (Isotropic Orthogonal Transform Algorithm). This method has the nice property of being nearly optimal with regard to ... |

28 | Em-based joint data detection and channel estimation of ds/cdma signals - Fleury, Kocian - 2002 |

27 | Information geometry of turbo and low-density parity-check codes,
- Ikeda, Tanaka, et al.
- 2004
(Show Context)
Citation Context ...nnel-state-estimation/decoding, would logically build on the expertise to be acquired from the initial phases of this work. A promising approach in this direction revolves around information geometry =-=[28]-=- which lends valuable geometric insights inbto these iterative algorithms, and which can also be exploited to accelerate the convergence rate. Action Plan • GET (17): Development of information geomet... |

27 | MMSE and adaptive prediction of time-varying channels for OFDM systems
- Schafhuber, Matz
- 2005
(Show Context)
Citation Context ...cially, for time-variant multiple-access MIMO channels the exploitation of the propagation characteristics become even more important. Channel estimation methods like the Kalman [30] or Wiener filter =-=[53]-=- assume the detailed knowledge of second order statistics of the timevariant channel (see also Section 1.9). The same is true for subspace methods based on the Karhunen-Loeve transform [54, 55]. Consi... |

25 |
Characterization of Doppler spectra for mobile communications at 5.3 GHz.
- Zhao, Kivinen, et al.
- 2003
(Show Context)
Citation Context ...low 100 wavelengths. Measurements at 5.2GHz have also shown that the Jakes model, although frequently used for analysis and simulations, is a rather crude idealization of real scattering environments =-=[72]-=-. It is a fundamental fact that the Doppler spectrum is bandlimited by the maximum velocity of mobile users. At a first glance, the Fourier basis expansion (i.e., a truncated discrete Fourier transfor... |

22 | Multiuser detection in fastfading multipath environments
- Sayeed, Sendonaris, et al.
- 1998
(Show Context)
Citation Context ...users. At a first glance, the Fourier basis expansion (i.e., a truncated discrete Fourier transform) appears to be the method of choice for time-variant channel estimation defining a channel subspace =-=[52]-=-. The Fourier basis expansion, however, suffers from a high estimation bias due to spectral leakage and Gibbs phenomenon. We conclude here that the channel subspace is not accurately spanned by a trun... |

21 | Genetic algorithm assisted joint multiuser symbol detection and fading channel estimation for synchronous CDMA systems,
- Yen, Hanzo
- 2001
(Show Context)
Citation Context ...oded transmitted bit sequences on the basis of the statistics provided by a bank of matched filters at the receiver. However, the specific choice of the GAs used requires further optimisation efforts =-=[67, 24]-=-. A spatial diversity reception assisted multiuser CDMA detectors based on genetic algorithms (GAs) are more sophisticated than their counterparts dispensing with diversity reception. In [68] two diff... |

14 |
OFDM multi-user communication over time-variant channels
- Zemen
- 2004
(Show Context)
Citation Context ...expansion, however, suffers from a high estimation bias due to spectral leakage and Gibbs phenomenon. We conclude here that the channel subspace is not accurately spanned by a truncated Fourier basis =-=[71]-=-. We note that transmitted data blocks are of finite duration. Using results from the theory of bandlimited and time-concentrated sequences, it has been shown that discrete prolate spheroidal sequence... |

13 |
An Inequality on the Capacity Region of Multiaccess Multipath Channels,” Communications and Cryptography: Two Sides of One Tapestry
- Gallager
- 1994
(Show Context)
Citation Context ...ing disjoint subsets of the available time interval (giving Time Division Multiple Access: TDMA) or the frequency band (giving Frequency Division Multiple Access: FDMA). Information-theoretic results =-=[21]-=- indicate that the overall sum capacity of the multiuser system exceeds the sum of the individual single-user capacities. Exploiting these multiuser capacity gains requires that all users collide in t... |

13 |
Space-Time IQ-Interleaved TCM and TTCM for AWGN and Rayleigh Fading Channels
- Ng, Hanzo
- 2002
(Show Context)
Citation Context ...on associated to each transmitted substream. • UoSo (51): Space-Time Block Coded Inphase-Quadrature phase (IQ)-interleaved Trellis Coded Modulation (TCM) and Turbo TCM (TTCM) schemes were proposed in =-=[42]-=-, which are capable of quadrupling the diversity order of conventional symbol-interleaved TCM and TTCM. The increased diversity order of the proposed schemes provides significant coding gains, when co... |

11 | Comparison of spacetime block coding and cyclic delay diversity for broadband mobile radio air interface",
- Dammann, Raulefs, et al.
- 2003
(Show Context)
Citation Context ...emes, termed semicoherent, are explored. • DLR (31): Differential modulation/demodulation suffers from a decorrelation of the channel. Such a decorrelation is achieved by cyclic delay diversity (CDD) =-=[13]-=-, which actually means an increase of diversity. Therefore, a trade-off between diversity increase and system degradation due to channel decorrelation for differential modulation/demodulation has to b... |

10 | Genetic Algorithm Assisted Minimum Bit Error Rate Multiuser Detection in Multiple Antenna Aided
- Alias, Chen, et al.
- 2004
(Show Context)
Citation Context ...ded search algorithms, such as genetic algorithms, may be invoked for finding the optimum weight vectors of the MBER MUD in the context of multiple-antenna aided multi-user OFDM [23]. Initial results =-=[2]-=- indicate that the MBER MUD is capable of supporting more users than the number of receiver antennas available, while outperforming the MMSE MUD. Adaptive antenna array assisted spatial processing has... |

10 |
Design and Performance of Fading Insensitive Orthogonal Frequency Division Multiplexing (OFDM) Using Polyphase Filtering Techniques
- harris, Lowdermilk
- 1996
(Show Context)
Citation Context ...orm can be modified by an appropriate windowing. But in a standard OFDM setup, in order to remove the resulting inter symbol interference, this leads either to the need of a post-processing equalizer =-=[39]-=-, [38] or to the addition of an extra guard interval [47]. Another windowing technique leading to good frequency localization consists in oversampling, thus reducing the overlap between subchannels an... |

9 |
On the capacity of multiuser wireless systems with multiple antennas
- Rhee, Cioffi
- 2003
(Show Context)
Citation Context ...proved link qualities call for the use of multiple antennas in wireless systems. The gains promised by MIMO techniques for point-to-point links carry over in an analogous fashion to multiuser systems =-=[49]-=-. The multiuser code design criteria mentioned above need to be generalized to account for the spatial dimension as well. A key knowledge gap here concerns how to design space-frequency codes for mult... |

8 |
Report and Order in the Matter of Revision of Part 15
- “First
- 2002
(Show Context)
Citation Context ...transmitter is limited by its peak or average power, in the case of the UWB channel, the RF emission regulations constrain only the power spectral density of the transmitted signal in the UWB channel =-=[19]-=-; i.e., the signal power is permitted to grow in proportion to the utilized bandwidth. As a result of this relaxed constraint on transmitter power, it turns out—not surprisingly—that there exist signa... |

8 | ISI-free FIR filterbank transceivers for frequency-selective channels,"
- Lin, Phoong
- 2001
(Show Context)
Citation Context ...ore, in the approach known as filtered multitone the resulting system is only approximately orthogonal. The orthogonality may be preserved, however, as shown for oversampled filter bank systems [25], =-=[37]-=-. The gap to fill in this context is to design perfectly orthogonal systems with rational oversampling factors being as close as possible to 1 [48] to retain spectral efficiency. Another way to introd... |

7 | Genetic algorithm assisted multiuser detection for asynchronous multicarrier CDMA
- Wei, Hanzo
- 2004
(Show Context)
Citation Context ... reliability of the edge bits, our proposed multiuser detector is capable of achieving a near-optimum bit error rate performance, while imposing a lower complexity than the optimum multiuser detector =-=[24, 69]-=-. The related open problems are in the area of improving the choice of the GA’s objective function, the employment of MIMO-aided performance improvements, etc. • UoE (53): Development of good quantise... |

6 |
Capacity bounds for an ultra-wideband channel model
- Arikan
- 2004
(Show Context)
Citation Context ...x months has been to focus on the applicability and implications of these results for the UWB schemes currently under study for IEEE 802.15.3a personal area network physical layer standardization. In =-=[3]-=-, we give estimates on the achievable rates for such networks using a channel model specified by the same IEEE group [6]. The analysis of this channel model is of interest in light of recent informati... |

6 |
Maximum a posteriori semi-blind channel estimation for OFDM systems operating on highly frequency selective channels
- Siala
- 2002
(Show Context)
Citation Context ...ner filter [53] assume the detailed knowledge of second order statistics of the timevariant channel (see also Section 1.9). The same is true for subspace methods based on the Karhunen-Loeve transform =-=[54, 55]-=-. Consistent estimators for these statistics of a multi-access MIMO channel are not available because the number of channel observations is rather limited by the spatio-temporal stationarity of the ch... |

6 |
Analysis of Second Order Statistics for Improved Channel Estimation in Wireless
- Viering
(Show Context)
Citation Context ...or these statistics of a multi-access MIMO channel are not available because the number of channel observations is rather limited by the spatio-temporal stationarity of the channel. It has been shown =-=[64]-=- that the spatial stationarity of the channel is below 100 wavelengths. Measurements at 5.2GHz have also shown that the Jakes model, although frequently used for analysis and simulations, is a rather ... |

5 |
Full-rate, full-diversity adaptive space time block coding for transmission over Rayleigh fading channels
- Ng, Yeap, et al.
(Show Context)
Citation Context ...spatial domain, the attainable performance of the ASTBC-SVD scheme does not degrade, when the channel impulse response values vary from one time slot to the next. Hence, the proposed ASTBC-SVD scheme =-=[46]-=- is attractive in the context of both uncorrelated and correlated Rayleigh fading channels. Further open problems are related to the side-information signalling between the receiver and transmitter. A... |

4 |
Analytical derivation of exit charts for simple block codes and for LDPC codes using information combining
- Land, Hoeher, et al.
- 2004
(Show Context)
Citation Context ...pt of bounding the combination of mutual information values [34] lead to bounds on information transfer functions for repetition codes, single parity-check codes, and applications to LDPC codes [58], =-=[33]-=-. The investigations focus on further generalizations and applications. The research effort will be carried out by Ingmar Land and Prof. Bernard Fleury. Potential NEWCOM partners include Prof. Johanne... |

4 | Joint Iterative-Detection of Reversible Variable-Length Coded Constant Bit Rate Vector-Quantized Video
- Ng, Maunder, et al.
- 2004
(Show Context)
Citation Context ... to exhibit a significantly better performance than traditional random code based DS-CDMA systems in a relatively low chip-rate scenario, provided that all users operate in a quasi-synchronous manner =-=[44]-=-. As the chip-rate increases, the number of resolvable paths also increases, which will impose a performance degradation on LASCDMA. However, MC LAS DS-CDMA extends the chip-duration by a factor corre... |

4 |
On the reduction of the out-of-band radiation of OFDM signals
- Pauli, Kuchenbecker
- 1998
(Show Context)
Citation Context ... standard OFDM setup, in order to remove the resulting inter symbol interference, this leads either to the need of a post-processing equalizer [39], [38] or to the addition of an extra guard interval =-=[47]-=-. Another windowing technique leading to good frequency localization consists in oversampling, thus reducing the overlap between subchannels and producing some sort of equivalent of the time guard int... |

4 |
Design of BFDM/OQAM systems based on biorthogonal modulated filter banks
- Siclet, Siohan
(Show Context)
Citation Context ...nnels, orthogonal waveforms are no longer the best choice and that non orthogonal waveforms should be used instead. Thus biorthogonal generalizations of OFDM/Offset-QAM have already been investigated =-=[56]-=-, [4] that are potential candidates for 4th generation mobile communication systems. A practical knowledge gap to fill for all these pulse shaped multicarrier modulation systems 12sconcerns their capa... |

3 |
Investigation of fairness issues with multiple antennas in high data rate CDMA systems
- Dinnis, Thompson
- 2004
(Show Context)
Citation Context ...echniques such as water filling cannot be used. It has also been found that the comparative performance of systems using multiple antennas can depend strongly on the type of scheduling algorithm used =-=[15]-=-. Using multiple antennas will also tend to decrease the channel diversity, decreasing the multiuser diversity gains. Therefore, considering the interaction between scheduling methods and multiple ant... |

3 | Outage capacities of a multi-carrier WLAN downlink under different resource sharing techniques - Ibars, Bar-Ness - 2002 |

3 | BJoint source-coding, channel coding and modulation schemes for AWGN and Rayleigh fading channels - Ng, Guo, et al. |

3 |
A design technique for oversampled modulated filter banks and OFDM/QAM modulations
- Pinchon, Siclet, et al.
- 2004
(Show Context)
Citation Context ..., as shown for oversampled filter bank systems [25], [37]. The gap to fill in this context is to design perfectly orthogonal systems with rational oversampling factors being as close as possible to 1 =-=[48]-=- to retain spectral efficiency. Another way to introduce pulse shaping without loss of orthogonality is to include a timeoffset when modulating each subcarrier. For instance, the Offset-QAM modulation... |

3 | Adaptive minimum symbol-error-rate CDMA linear multiuser detector for pulse-amplitude modulation
- Samingan, Chen, et al.
(Show Context)
Citation Context ...oblems arise. For example, the achievable performance depends strongly on the specific choice of spreading codes used and this deficiency has to be addressed in the context of rapidly fading channels =-=[8, 9, 51]-=-. 1.2.3 Blind Acquisition — Channel and Data Estimation For specific applications such as sensor networks, ad-hoc networks, short packet communications, and intelligent vehicular communication systems... |

3 |
BAntenna diversity assisted genetic algorithm based multiuser detection schemes for synchronous CDMA systems
- Yen, Hanzo
- 2003
(Show Context)
Citation Context ...orts [67, 24]. A spatial diversity reception assisted multiuser CDMA detectors based on genetic algorithms (GAs) are more sophisticated than their counterparts dispensing with diversity reception. In =-=[68]-=- two different GA-based individual-selection strategies are considered. In our first approach the so-called individuals of the GA are selected for further exploitation based purely on the sum of their... |

2 |
Turbo Detection of Space-time Signals Using Sphere Packing Modulation
- Alamri, Yeap, et al.
- 2004
(Show Context)
Citation Context ...e signal construction method that combines orthogonal design with sphere packing, referred to here as STBC-SP, has shown useful performance improvements over Alamouti’s conventional orthogonal design =-=[1]-=-. In recent years, iterative decoding algorithms have attained substantial performance improvements in the context of wireless communication systems. In this paper, we demonstrate that the performance... |

2 |
Modeling Sub-committee Report,” Dec
- “Channel
(Show Context)
Citation Context ...udy for IEEE 802.15.3a personal area network physical layer standardization. In [3], we give estimates on the achievable rates for such networks using a channel model specified by the same IEEE group =-=[6]-=-. The analysis of this channel model is of interest in light of recent information-theoretic work on multipath fading channels which show that, in order to take full advantage of capacity of wideband ... |

2 |
Multiple antenna options for high data rate CDMA systems
- Dinnis, Thompson
(Show Context)
Citation Context ...ransmitter, interference suppression can be performed. As a result, when a channel is poor, receive antenna diversity will outperform MIMO, with MIMO giving higher capacities when the channel is good =-=[14]-=-. In high data rate systems such as 1xEV-DO and HSDPA, the base station transmits with full power to a single user at a time. Adaptive modulation and coding is used to transmit data at a rate appropri... |

2 |
et al., “Improved interference cancellation for turbo-equalization
- Fijalkow
- 2000
(Show Context)
Citation Context ...y employ iterative synchronization/equalization algorithms appealing to the turbo principle. Indeed, algorithm design thus far has assumed perfect channel state information. Some studies (e.g., [61], =-=[18]-=-) have modified the outer processor when only partial channel state information is available. Design of optimal outer processors (in a maximum likelihood sense) is desired and sub-optimal versions sho... |

2 | Iterative MIMO multi-user detection: Performance evaluation with COST 259 channel model
- Hofstetter, Zemen, et al.
- 2004
(Show Context)
Citation Context ...pian basis expansion. A dual situation exists in the frequency domain [17], so that a modified Slepian basis expansion can be applied for exploiting the correlation between the individual subcarriers =-=[26]-=-. A straightforward application of time-variant SISO estimators to all elements of the MIMO matrix is inefficient. We need to estimate the relevant MIMO channel subspaces instead. One notable example ... |

2 |
Pulse design for robust multicarrier transmission over doubly dispersive channels
- Kodek, Molisch, et al.
- 1998
(Show Context)
Citation Context ... to additional computational complexity. As shown in the filter bank implementation described in [57], though, nearly optimal results can be obtained with very short waveforms. A theoretical analysis =-=[32]-=- reveals that, for transmission over time- and frequency-dispersive channels, orthogonal waveforms are no longer the best choice and that non orthogonal waveforms should be used instead. Thus biorthog... |

2 |
Windowed multicarrier systems with minimum spectral leakage
- Lin, Jian, et al.
- 2004
(Show Context)
Citation Context ...n be modified by an appropriate windowing. But in a standard OFDM setup, in order to remove the resulting inter symbol interference, this leads either to the need of a post-processing equalizer [39], =-=[38]-=- or to the addition of an extra guard interval [47]. Another windowing technique leading to good frequency localization consists in oversampling, thus reducing the overlap between subchannels and prod... |

2 |
et al., “Joint equalization and decoding: Why choose the iterative solution
- Roumy
- 1999
(Show Context)
Citation Context ...ite manifest in some circumstances, but misconvergence behavior such as limit cycles, chaos, or numeri22scal singularities are also observed in harsher communication environments. Simulation evidence =-=[50]-=- shows that a good first estimate (or a priori information) has a critical impact on the performance of such iterative algorithms, unlike classical turbo decoding algorithms where little a priori know... |

1 | Spectral efficiency of multicarrier CDMA,” submitted to - Li, Tulino, et al. - 2003 |