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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。
As one of the key technologies of TD-SCDMA system, multi-user joint detection (JD) technology has excellent anti-MAI and anti-near-far effect performance. Based on the establishment of the uplink propagation model, taking the most widely used zero-force linear block equalization algorithm as an example, the article studies the core matrix inversion part of the algorithm in detail. Cholesky decomposition algorithm and block FFT Decomposition algorithm for theoretical analysis and computer simulation. The simulation results show that the block FFT decomposition algorithm has poorer detection performance than the Cholesky decomposition algorithm, but the complexity is effectively reduced.