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12
Robust beamforming for wireless information and power transmission
- IEEE Wireless Commun. Letters
, 2012
"... Abstract—In this letter, we study the robust beamforming problem for the multi-antenna wireless broadcasting system with simultaneous information and power transmission, under the assumption of imperfect channel state information (CSI) at the transmitter. Following the worst-case deterministic model ..."
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Abstract—In this letter, we study the robust beamforming problem for the multi-antenna wireless broadcasting system with simultaneous information and power transmission, under the assumption of imperfect channel state information (CSI) at the transmitter. Following the worst-case deterministic model, our objective is to maximize the worst-case harvested energy for the energy receiver while guaranteeing that the rate for the information receiver is above a threshold for all possible channel realizations. Such problem is nonconvex with infinite number of constraints. Using certain transformation techniques, we convert this problem into a relaxed semidefinite programming problem (SDP) which can be solved efficiently. We further show that the solution of the relaxed SDP problem is always rank-one. This indicates that the relaxation is tight and we can get the optimal solution for the original problem. Simulation results are presented to validate the effectiveness of the proposed algorithm. Index Terms—Energy harvesting, beamforming, worst-case robust design, semidefinite programming.
Coordinate beamforming with relaxed zero forcing: The sequential orthogonal projection combining method and rate control
- Mar. 2012 [Online]. Available: http:// arxiv.org/abs/1203.1758,, ArXiv Pre-Print cs.IT/1203.1758
"... Abstract—In this paper, a new beam design paradigm for coordinated beamforming (CB) for current and future cellular networks is proposed based on a relaxed zero-forcing (RZF) constraint. In the conventional zero-forcing (ZF) CB, each co-operating transmitter designs its transmit beamforming matrix t ..."
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Cited by 4 (4 self)
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Abstract—In this paper, a new beam design paradigm for coordinated beamforming (CB) for current and future cellular networks is proposed based on a relaxed zero-forcing (RZF) constraint. In the conventional zero-forcing (ZF) CB, each co-operating transmitter designs its transmit beamforming matrix to null out interference to undesired receivers completely. In the proposed RZF paradigm, however, the ZF constraint is relaxed so that a tolerable amount of interference leakage to undesired receivers is allowed for the beam design at each transmitter. By relaxing the ZF constraint in such a way, transmitters have more degrees of freedom for their beam design to increase the overall data rate of the network. An efficient algorithm for the RZFCB is proposed based on a projected subgradient method. Numerical results show that the proposed RZFCB shows a noticeable gain over the conventional ZFCB. Index Terms—Coordinated beamforming, MIMO system, Zero-forcing, Interference channel, Projected subgradient method.
On the Pareto boundary for the two-user single-beam MIMO interference channel
- IEEE TRANS. SIGNAL PROCESSING, DEC. 2011, [ONLINE].AVAILABLE: HTTP://ARXIV.ORG/ABS/1202.5474
, 2012
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Alternating rate profile optimization in single stream MIMO interference channels
- in Proc. of IEEE ICASSP
, 2013
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Coalitional games in MISO interference channels: Epsilon-core and coalition structure stable set
- IEEE Trans. Signal Process
, 2014
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Coordinated Beamforming With Relaxed Zero Forcing: The Sequential Orthogonal Projection Combining Method and Rate Control
, 2012
"... Abstract—In this paper, coordinated beamforming based on relaxed zero forcing (RZF) for transmitter-receiver pair multiple-input single-output (MISO) and multiple-input mul-tiple-output (MIMO) interference channels is considered. In the RZF coordinated beamforming, conventional zero-forcing interfer ..."
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Abstract—In this paper, coordinated beamforming based on relaxed zero forcing (RZF) for transmitter-receiver pair multiple-input single-output (MISO) and multiple-input mul-tiple-output (MIMO) interference channels is considered. In the RZF coordinated beamforming, conventional zero-forcing interference leakage constraints are relaxed so that some prede-termined interference leakage to undesired receivers is allowed in order to increase the beam design space for larger rates than those of the zero-forcing (ZF) scheme or to make beam design feasible when ZF is impossible. In the MISO case, it is shown that the rate-maximizing beam vector under the RZF framework for a given set of interference leakage levels can be obtained by sequential orthogonal projection combining (SOPC). Based on this, exact and approximate closed-form solutions are provided in two-user and three-user cases, respectively, and an efficient beam design algorithm for RZF coordinated beamforming is provided in general cases. Furthermore, the rate control problem under the RZF framework is considered. A centralized approach and a distributed heuristic approach are proposed to control the position of the designed rate-tuple in the achievable rate region. Finally, the RZF framework is extended to MIMO interference channels by deriving a new lower bound on the rate of each user. Index Terms—Coordinated beamforming, inter-cell interfer-ence, multi-cell MIMO, Pareto-optimal, rate control, relaxed zero-forcing, sequential orthogonal projection combining.
