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在单用户场景下,对于独立同分布的瑞利衰落信道,格拉斯曼码本可以取得良好的系统性能。但是由于该码本只包含信道的相位信息,缺乏幅度信息,不能直接应用于多用户特征波束成形。在格拉斯曼码本中加入幅度信息将得到接近均匀量化的码本。针对均匀量化码本量化性能较差问题,提出一种基于最小均方误差准则的非均匀量化码本的构建方法:码本的量化电平数由接收信噪比确定,量化电平值和门限值由信道参数的概率密度函数确定。理论和仿真结果表明:非均匀量化码本相对均匀量化码本的和容量性能大约有3-4d B的改善、误码率性能大约有2-3d B的改善。
In a single user scenario, the Gaussian codebook achieves good system performance for Rayleigh fading channels that are independently and identically distributed. However, since the codebook contains only the phase information of the channel and lack of amplitude information, it can not be directly applied to multi-user eigenbeam forming. Adding amplitude information to a Grasmell codebook results in a nearly uniformly quantized codebook. Aiming at the poor quantization performance of uniform quantized codebook, a method of constructing non-uniform quantized codebook based on the minimum mean square error criterion is proposed. The quantization level of the codebook is determined by the received signal-to-noise ratio, the quantization level and the gate The limit is determined by the probability density function of the channel parameters. The theoretical and simulation results show that the capacity performance of the relatively uniform quantized codebook with nonuniformly quantized codebook has about 3-4d B improvement, and the bit error rate performance has about 2-3d B improvement.