Equivalent channel Eigen-values product quantization criterion for limited feedback beamforming in MIMO systems

Beamforming is one of the key techniques for the multiple-input multiple-output (MIMO) wireless communication systems, which enables the system to achieve higher performance. In this paper, the Grassmann codebooks are employed to quantize channel state information (CSI) in the MIMO downlink for Long Term Evolution (LTE). Further more, a novel beamforming (BF) scheme based on the proposed equivalent channel Eigen-values product (EVP) quantizing criterion is developed. The proposed BF scheme jointly optimizes the system channel capacity and bit error rate (BER) performance. Hence, the proposed scheme outperforms the traditional quantizing criteria, where only one factor is concerned. The extensive simulation results verify that the proposed BF scheme obtains better performance in terms of both system capacity and BER.