基于部分协作的多小区下行MIMO鲁棒双层预编码算法

Robust Double-Layer Precoding Algorithm for Multi-Cell Downlink MIMO Based on Partial Collaboration

针对多小区协作多入多出（MIMO）系统中存在的信道状态信息（CSI）反馈回传过多的问题,提出了多小区部分协作MIMO系统预编码算法.首先建立了包含信道估计、量化和延时误差的联合误差模型,然后根据此信道误差模型,利用迫零和信漏噪比算法思想,提出一种多小区部分协作下的双层MIMO鲁棒预编码算法.数值分析及仿真结果表明,所提算法相比传统的多小区协作下行MIMO系统预编码算法,用户的误码率性能和系统和速率稍差,但在CSI反馈比特方面有一定优势.

In order to reduce the feedback bits of channel state information（ CSI） in multi-cell cooperative multiple input multiple output（ MIMO） system,a multi-cell partial cooperative MIMO precoding algorithm is proposed. Firstly,a joint channel error model including channel estimation error,quantization error and delay error,is established. Then,by using zero forcing and signal to leakage and interference ratio,a double-layer MIMO robust precoding algorithm is proposed. Numerical analysis and simulation results show that,compared with the traditional multi-cell MIMO system precoding algorithms,the bit error rate and the sum rate capacity are slightly worse,but the proposed algorithm has great advantage in CSI feedback bits.