酉阵和非酉阵预编码的输出SINR分析

Output SINR analysis of unitary and non-unitary precoding system

在LTE(Long Term Evolution)的预编码技术中,预编码矩阵存在着使用酉阵和非酉阵的选择。本文分析了酉阵预编码的输出SINR的形式,提出了一种简化计算输出SINR计算的方法,计算4个矩阵(8个矢量)的输出SINR操作复杂度下降到原始方法的18%。同时分析了非酉阵预编码时的输出SINR相比于使用酉阵时的损失。仿真结果表明,非酉阵预编码相比于酉阵预编码在输出SINR上会有损失,这种损失从统计上可以用线性关系近似描述。

Precoding matrix can been selected based on unitary or non-unitary under LTE precoding technology. This paper analyses output SINR form of unitary precoding matrix, and presents a more simple method of calculation for SINR, so that operation complexity can drop to 18% with 4 matrices （i.e. 8 vectors） MIMO precoding system. Comparison between SINR for non-unitary precoding system and for unitary was also being investigated. Simulation results show that non-unitary precoding system SINR is inferior to the unitary and estimation loss can been linearly statistically described