TD—SCDMA系统联合检测矩阵求逆算法的研究与比较

Research and Comparison of Matrix Inversion Algorithm of TD—SCDMA JD

多用户联合检测(JD)技术作为TD—SCDMA系统的关键技术之一,具有优良的抗多址干扰(MAI)和抗远近效应性能。文章在建立上行链路传播模型的基础上,以目前应用最广泛的迫零线性块均衡算法为例,对算法中最核心的矩阵求逆部分进行了深入的研究,对Cholesky分解算法和块FFT分解算法进行了理论分析和计算机仿真。仿真结果表明,块FFT分解算法较Cholesky分解算法检测性能为差,但复杂度有效降低。

Multi-user Joint Detection is a key technology of TD--SCDMA, which has excellent performance in resisting multiple access interference and near-far effect. With uplink transmission model established and ZF-BLE taken as an example, the most important part of algorithm the inversion of the system matrix is studied, and the Cholesky decomposition and the block FFT decomposition are analyzed in theory and simulated with computer. The result of simulation indicates that the performance of the block FFT decomposition is worse than that of the Cholesky decomposition, but the complexity of the block FFT decomposition is much lower.