下行多用户MIMO系统中低复杂度块对角化预编码算法

摘要

为在保证误码性能的情况下降低块对角化预编码算法计算复杂度，提出一种基于矩阵伪逆与LDL“分解的多用户多输人多输出（MIMO）系统块对角化（BD）预编码改进算法LDLHBD（QR）。算法通过全局信道矩阵伪逆与块QR分解进行零空间计算，避免复杂的矩阵奇异值分解（SVD），快速实现信道块对角化。并采用能提供均匀子信道增益的LDL“方式对等效信道进行优化分解，实现预编码矩阵设计。仿真结果表明该算法计算复杂度明显降低，并获得了与传统块对角化算法相近的误码率性能。%To reduce the computational complexity of block diagonalization precoding algorithm and ensure the BER performance, a block diagonalization precoding algorithm, named as LDLH-BD( QR), was proposed for muhiuser multi-input multi-output (MIMO) sys- tems, based on pseudo inverse and LDLH decomposition. Firstly, computational complexity was reduced by combining global channel ma- trix pseudo-inverse and QR decomposition. Therefore, channel block diagonalization was fast finished. Furthermore, the LDLH decompo- sition which has moderate subchannel gains uniformity was applied to optimize the equivalent channel for each single-user, so that proc- oding matrix was completed. Simulation results showed that the proposed algorithm has less computational complexity and similar bit er- ror rate performance as the traditional block diagonalization algorithm.