TY - GEN
T1 - Achievable rate region for downlink beamforming in the presence of interference
AU - Shang, Xiaohu
AU - Chen, Biao
PY - 2007
Y1 - 2007
N2 - We study in this paper optimal signaling for downlink transmission with mutual interference. Restricting each receiver to a single user detector, we show that computing the achievable rate region amounts to solving a family of nonconvex optimization problems. Recognizing the intrinsic connection between the signal power at the intended receiver and the interference power at the unintended receiver, we convert the original family of non-convex optimization problems into a new family of convex optimization. Closed-form solutions to this new family of optimization problems are derived. Interestingly, with multiple-antenna transmitters and single-antenna receivers, the optimal downlink transmission with interference always reduces to a simple beamforming scheme. Finally, we note that similar procedure can be devised for systems with more than two pairs of mutually interfering users.
AB - We study in this paper optimal signaling for downlink transmission with mutual interference. Restricting each receiver to a single user detector, we show that computing the achievable rate region amounts to solving a family of nonconvex optimization problems. Recognizing the intrinsic connection between the signal power at the intended receiver and the interference power at the unintended receiver, we convert the original family of non-convex optimization problems into a new family of convex optimization. Closed-form solutions to this new family of optimization problems are derived. Interestingly, with multiple-antenna transmitters and single-antenna receivers, the optimal downlink transmission with interference always reduces to a simple beamforming scheme. Finally, we note that similar procedure can be devised for systems with more than two pairs of mutually interfering users.
KW - Achievable rate region
KW - Beamforming
KW - Gaussian interference channel
UR - http://www.scopus.com/inward/record.url?scp=50249151897&partnerID=8YFLogxK
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U2 - 10.1109/ACSSC.2007.4487519
DO - 10.1109/ACSSC.2007.4487519
M3 - Conference contribution
AN - SCOPUS:50249151897
SN - 9781424421107
T3 - Conference Record - Asilomar Conference on Signals, Systems and Computers
SP - 1684
EP - 1688
BT - Conference Record of the 41st Asilomar Conference on Signals, Systems and Computers, ACSSC
T2 - 41st Asilomar Conference on Signals, Systems and Computers, ACSSC
Y2 - 4 November 2007 through 7 November 2007
ER -