关键词: 多输入多输出, 广播信道, 随机量化码本, 量化, 反馈, 容量上界

Abstract:

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.

Key words: multiple-input multiple-output(MIMO), broadcasting channel(BC), random quantization codebook, quantization, limited feedback, capacity upperbound