一种容量上界最大化的量化反馈方法

研究了多输入多输出广播通信(MIMO BC)系统中的信道量化反馈问题．通过分析得到了一个接收用户容量上界，并基于该上界最大化构造了一种新的量化反馈方法．该方法采用随机量化码本，不仅考虑了信道的方向还考虑了子信道增益信息．仿真结果表明，相对只量化反馈信道方向信息的方法，该方法不仅显著提高了量化误差存在下的系统容量，并且复杂度更低．

Quantized-feedback scheme based on capacity upperbound maximizing in the MIMO BC system

The quantization and limited feedback of channel state information (CSI) for the Multiple-input Multiple-output Broadcasting Channel(MIMO BC) are considered. Through analysis, a capacity upperbound for the receiver is derived and a novel quantized-feedback scheme is constructed based on this bound maximizing. The novel scheme utilizes the benefits of the random quantization codebook and considers not only the channel direction but also the gain of the sub-channel. Simulation shows that the proposed scheme improves the system capacity in the presence of quantization errors obviously and has less complexity than the conventional method, which only includes channel direction information.