In this paper, capacity degradation of zero-forcing beam forming (ZFBF) system due to outdated CSI is investigated. A linear minimum mean square error (MMSE) channel predictor is employed to cope with the feedback delay and improve the capacity performance. Based on the power density function of the system’s signal to interference plus noise ratio (SINR), the analytic sum capacity expression relevant to the prediction error is derived. Numerical simulations show effectiveness of the predictor that exploits the channel’s temporal correlation against feedback delay. The simulation results are consistent with the analytic research.
LU Min, ZENG Gui-gen, FENG Guang-zeng
. Performance of Zero-Forcing Beam Forming System with Channel Prediction[J]. Journal of Applied Sciences, 2013
, 31(3)
: 228
-232
.
DOI: 10.3969/j.issn.0255-8297.2013.03.002
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