TY - JOUR
T1 - Adaptive modulation for multi-antenna transmissions with channel mean feedback
AU - Zhou, Shengli
AU - Giannakis, Georgios B
PY - 2003/7/18
Y1 - 2003/7/18
N2 - Adaptive modulation has the potential to increase the system throughput significantly by matching transmitter parameters to time-varying channel conditions. However, adaptive modulation assuming perfect channel state information (CSI) is sensitive to CSI imperfections induced by estimation errors and feedback delays. In this paper, we design adaptive modulation schemes for multi-antenna transmissions based on partial CSI, that models the spatial fading channels as Gaussian random variables with non-zero mean and white covariance, conditioned on feedback information. Based on a two-directional beamformer, our proposed transmitter optimally adapts the beam directions, the power allocation between two beams, and the signal constellation, to maximize the transmission rate while maintaining a target bit error rate (BER). Numerical results demonstrate the rate improvement, and illustrate an interesting tradeoff that emerges between feedback quality and hardware complexity.
AB - Adaptive modulation has the potential to increase the system throughput significantly by matching transmitter parameters to time-varying channel conditions. However, adaptive modulation assuming perfect channel state information (CSI) is sensitive to CSI imperfections induced by estimation errors and feedback delays. In this paper, we design adaptive modulation schemes for multi-antenna transmissions based on partial CSI, that models the spatial fading channels as Gaussian random variables with non-zero mean and white covariance, conditioned on feedback information. Based on a two-directional beamformer, our proposed transmitter optimally adapts the beam directions, the power allocation between two beams, and the signal constellation, to maximize the transmission rate while maintaining a target bit error rate (BER). Numerical results demonstrate the rate improvement, and illustrate an interesting tradeoff that emerges between feedback quality and hardware complexity.
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M3 - Conference article
AN - SCOPUS:0037634389
SN - 0536-1486
VL - 4
SP - 2281
EP - 2285
JO - Conference Record - International Conference on Communications
JF - Conference Record - International Conference on Communications
T2 - 2003 International Conference on Communications (ICC 2003)
Y2 - 11 May 2003 through 15 May 2003
ER -