基于 SNR的 LTE上行虚拟 MIMO 多用户配对算法研究

摘要

针对LTE系统上行链路中的虚拟MIMO（ Multil-input Mutil-output）（ VMIMO）多用户配对问题，首先构建一个VMIMO系统模型，参考用户配对前后的输出信噪比，对常见的随机配对、正交配对、交叉容量配对及最大容量配对算法进行理论上的推导分析；然后就系统容量、容量损耗、用户公平性及计算复杂程度四项性能指标进行仿真对比。结果表明正交配对算法的计算复杂程度与配对用户数无关，并且随着基站侧接收天线的增多，算法的复杂程度反而有所下降。与其他三种配对算法相比较，正交配对算法系统合容量、用户容量损耗与用户公平性三者间取得了较好的平衡，有利于充分发挥VMIMO技术的优势。%For virtual multi-input and multi-output ( VMIMO) multi-user pairing issue in LTE uplink system, first we build a VMIMO sys-tem model, and conduct the theoretical derivation and analysis on the algorithms of random pairing, orthogonal pairing, cross capacity pairing and maximum capacity pairing based on referring the output signal-to-noise ratio ( SNR) before and after users'pairing.Then we carry out simulation comparison on four performance indices of system capacity, capacity loss, user fairness and computational complexity.Results show that the computational complexity of orthogonal pairing algorithm has nothing to do with the number of pairing users, and with the in-crease of receiving antennas on base station, the complexity of the algorithm is decreased instead.Compared with other three pairing algo-rithms, the orthogonal pairing algorithm also keeps a good balance between combined capacity, user capacity loss and the user fairness, which will be conducive to give full play to the advantages of VMIMO technology.