Diversity-Achieving Quadrature Space-Frequency Index Modulation
Diversity-Achieving Quadrature Space-Frequency Index Modulation
复制标题
实现分集正交空频索引调制
DOI：
10.1109/lcomm.2021.3074410
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发表时间：
2021-07
期刊：
影响因子：
--
通讯作者：
Yanzhang Shao
中科院分区：
文献类型：
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作者：
Yilei Xue;Lei Wang;Yanzhang Shao
正交空频索引调制(QSF-IM)是最近发展起来的一种空频传输方案，它将正交空间调制的思想推广到空域和频域。然而，QSF-IM缺乏发射分集。本文将QSF-IM与空频码设计相结合，提出了一种新的实现二阶发射分集的QSF-IM(DA-QSFIM)方案。在该方案中，符号向量的实部和虚部分别与两个不同的预编码矩阵相乘，然后以对角或反对角的形式放置到空频资源块中进行传输。给出了理论性能分析和仿真结果，验证了DA-QSFIM在瑞利和莱斯信道下的误码率性能优于其他已有方案。
Quadrature space-frequency index modulation (QSF-IM) is a recently developed space-frequency transmission scheme which generalizes the idea of quadrature spatial modulation into both spatial and frequency domains. However, QSF-IM lacks of transmit diversity. In this letter, by combining QSF-IM and space-frequency code designing, a novel diversity-achieving QSF-IM (DA-QSFIM) scheme which can achieve the second-order transmit diversity is proposed. In the proposed scheme, the real and imaginary parts of a symbol vector are respectively multiplied by two different precoding matrices and then they are placed into space-frequency resource block in diagonal or anti-diagonal form for transmission. Theoretical performance analysis and simulation results are presented to validate the superiority of DA-QSFIM over other existing schemes in terms of bit error rate (BER) performance under both Rayleigh and Rician channels.