Abstract:

In multiplein multipleout (MIMO) broadcast systems with limited feedback, when receivers are equipped with multiple antennas, the socalled quantization error of channel direction matrix will be unavoidably introduced. This quantization error results in the reduction of system capacity since it is referenced in the Precoding design. A robust Precoding method based on minimum mean square error（MMSE） is proposed, which considers the statistical characteristics of the quantization error for channel direction matrix. Simulation shows that the proposed method effectively enhanced system capacity, reduced bit error rate (BER), as well as mitigated the plateau effect.

Key words: multiple input multiple output, minimum mean squared error, limited feedback, joint precoding