Abstract

This paper presents three multiuser multiple input-multiple output (MU-MIMO) downlink transmission strategies based on the extended quadrature spatial modulation (EQSM) system for mobile communication. The three MU-MIMO precoding strategies utilised are block diagonalisation (BD), dirty paper coding (DPC), and a combined BD-DPC strategy. We analyse and compare the performance of these three MU-MIMO-EQSM schemes with the conventional MU-MIMO spatial multiplexing (MU-MIMO-SMux) system in terms of bit error rate (BER) and detection complexity considering correlated and uncorrelated fading channels. Results show that the BD-MIMO-EQSM and DPC-MIMO-EQSM systems outperform by 2−3 dB in BER performance their conventional counterparts with the additional advantage of a detection complexity reduction of up to 62% for the analysed cases. For the uncorrelated fading channel, the BD technique has better BER performance for a spectral efficiency (SE) of 12 bits per channel use (bpcu), while the DPC technique has better BER performance for an SE of 8 bpcu. Considering the correlated channel, DPC suffers a deep BER degradation of up to 30 dB compared with BD. However, still in this scenario, both proposed MU-MIMO-EQSM systems outperform their conventional counterparts. In terms of detection complexity, DPC has a complexity reduction of 77% as compared with the BD technique. The BD-DPC-MIMO-EQSM hybrid system heritages the low detection complexity of DPC with the advantage of all users in the system having the same BER performance.

中文翻译：

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相关衰落信道的基于EQSM的多用户MIMO下行链路传输

摘要

本文提出了基于扩展正交空间调制（EQSM）系统的三种多用户多输入多输出（MU-MIMO）下行链路传输策略，用于移动通信。所使用的三种MU-MIMO预编码策略是块对角化（BD），脏纸编码（DPC）和组合的BD-DPC策略。我们在考虑相关和不相关衰落信道的误码率（BER）和检测复杂度方面，分析和比较了这三种MU-MIMO-EQSM方案与常规MU-MIMO空间复用（MU-MIMO-SMux）系统的性能。结果表明，BD-MIMO-EQSM和DPC-MIMO-EQSM系统的BER性能优于传统系统，其2-3 dB，并具有检测复杂度最多降低62 ％的优势。对于分析的案例。对于不相关的衰落信道，对于每信道使用（bpcu）12位的频谱效率（SE），BD技术具有更好的BER性能，而对于8 bpcu的SE，DPC技术具有更好的BER性能。考虑到相关的信道，与BD相比，DPC的BER下降高达30 dB。但是，仍然在这种情况下，两个提议的MU-MIMO-EQSM系统都优于它们的常规对应系统。在检测复杂度方面，与BD技术相比，DPC的复杂度降低了77 ％。BD-DPC-MIMO-EQSM混合系统继承了DPC的低检测复杂性，其优点是系统中的所有用户都具有相同的BER性能。