Precoding of Space-Time Block Codes in Multiuser MIMO Channels with Outdated Channel State Information

Jane Wei Huang, E. Au, V. Lau
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引用次数: 10

Abstract

Motivated by the fact that combining space-time block codes with channel precoding can make the system robust against channel fading while achieving both coding and diversity gains, we propose a joint set of linear precoder designs for uplink multiuser space-time block coded multiple-input multiple-output systems with multipacket reception by exploiting outdated channel state information. In particular, we formulate the design as an optimization problem of minimizing pairwise error probability subject to transmit power constraint for each user. Due to non-convex nature of the optimization problem, we devise an iterative algorithm to solve for linear precoding structure for general space-time block code. For orthogonal space-time block code, we also propose a simplified distributed algorithm to solve for a closed-form solution. Asymptotic analysis of the effect of channel quality on the precoder structure is also presented. Simulation results are provided to demonstrate the effectiveness of the proposed designs for orthogonal and quasi-orthogonal space-time block codes over the conventional beamforming system.
具有过时信道状态信息的多用户MIMO信道空时分组码的预编码
考虑到空时分组编码与信道预编码相结合可以使系统对信道衰落具有鲁棒性,同时获得编码增益和分集增益,我们提出了一套联合线性预编码器设计,用于利用过时信道状态信息进行多包接收的上行多用户空时分组编码多输入多输出系统。特别地,我们将设计表述为在每个用户的传输功率约束下最小化成对错误概率的优化问题。由于优化问题的非凸性,我们设计了一种迭代算法来求解一般空时分组码的线性预编码结构。对于正交空时分组码,我们还提出了一种简化的分布式算法来求解闭型解。文中还对信道质量对预编码器结构的影响进行了渐近分析。仿真结果证明了所提出的正交和准正交空时分组码设计比传统波束形成系统的有效性。
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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