Beamforming algorithms for multiuser MIMO uplink systems: Parallel and serial approaches

S. Tabatabaee, H. Zamiri-Jafarian
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引用次数: 9

Abstract

Joint transmitter and receiver beamforming algorithms for uplink multiuser multi-input multi-output (MIMO) communication systems are proposed in this paper based on maximizing an utility function, which is defined based on the difference between desired signal power and interference plus noise power. Two iterative beamforming algorithms are developed by maximizing the utility function of each user via parallel and serial methods. In parallel method, the transmitter and receiver beamforming vectors of each user are iteratively updated by maximizing its utility function. However in serial method, at first step, the transmitter beamforming vectors of all users are iteratively updated by maximizing the utility function of each user and then receiver beamforming vectors of users are calculated. By computer simulations, the performances of the proposed beamforming algorithms are evaluated and also compared with the performance of the duality method (DM) based beamforming algorithm. With respect to bit error rate (BER) and convergence rate, the results show that the new proposed beamforming algorithms have superior performances in comparison with the DM based beamforming algorithm. Also, for some cases, the serial method achieves better performances in comparison with the parallel method.
多用户MIMO上行系统的波束形成算法:并行和串行方法
针对上行多用户多输入多输出(MIMO)通信系统,提出了基于效用函数最大化的联合收发波束形成算法。效用函数是根据期望信号功率与干扰加噪声功率之差定义的。通过并行和串行两种方法,以最大化每个用户的效用函数为目标,提出了两种迭代波束形成算法。在并行方法中,每个用户的发送和接收波束形成矢量通过最大化其效用函数进行迭代更新。串行方法首先通过最大化每个用户的效用函数迭代更新所有用户的发射波束形成矢量,然后计算用户的接收波束形成矢量。通过计算机仿真,对所提波束形成算法的性能进行了评价,并与基于对偶方法的波束形成算法的性能进行了比较。在误码率和收敛率方面,与基于DM的波束形成算法相比,本文提出的波束形成算法具有更好的性能。此外,在某些情况下,串行方法比并行方法具有更好的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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