基于正交空时分组码的差分空间调制方案
2017年9月 Journal on Communications September 2017 2017189-1
第38卷第9期
通 信 学 报 V ol.38 No.9基于正交空时分组码的差分空间调制方案
王志成，陈志刚，王磊
（西安交通大学电子与信息工程学院，陕西 西安710049）
摘 要：针对常规差分空间调制（DSM, differential spatial modulation ）方法没有发射分集功能以及接收译码复杂
度高的问题，提出一种基于正交空时分组码的差分空间调制（OSTBC-DSM, differential spatial modulation scheme
based on orthogonal space-time block code ）方案。设计了2个矩阵：空间调制矩阵和符号矩阵，前者通过设置其中
非零元素的位置来激活不同的发射天线，后者采用正交空时分组码（OSTBC ）作为基本码块来构造符号矩阵。所
提方案具有可获得满发射分集、频谱效率高等优点，同时支持线性最大似然（ML, maximum likelihood ）译码。仿
真结果表明，所提方案在不同的频谱效率下均获得了比其他几种方案更好的误比特率（BER, bit error rate ）性能。
关键词：差分空间调制；正交空时分组码；发射分集；线性译码
中图分类号：TN929.53 文献标识码：A
Differential spatial modulation scheme based on
orthogonal space-time block coded
WANG Zhi-cheng, CHEN Zhi-gang, WANG Lei
( School of Electronics and Information Engineering, Xi’an Jiaotong University, Xi’an 710049, China)
Abstract: Focusing on the problem that differential spatial modulation (DSM) couldn’t obtain transmit diversity and has
high decoding complexity, a new differential spatial modulation scheme based on the orthogonal space-time block code
was proposed and the proposed scheme is called OSTBC-DSM. There were two matrices in this scheme: the spatial mod-
ulation matrix and the symbol matrix. The former was aimed to activate different transmit antennas by setting the position
of nonzero elements, and the latter structured symbolic matrix by using orthogonal space-time block codes (OSTBC) as
the basic code block. The proposed scheme could obtain full transmit diversity and higher spectral efficiency compared
with the conventional DSM schemes. Moreover, the OSTBC-DSM supported linear maximum likelihood (ML) decoding.
The simulation results show that under different spectral efficiencies, the proposed OSTBC-DSM scheme has better bit
error rate (BER) performance than other schemes.
Key words: differential spatial modulation, orthogonal space-time block code, transmit diversity, linear decoding
1 引言
在多天线无线通信技术中，空间调制（SM,
spatial modulation ）技术[1]由于每次只激活一根发射
天线，很好地解决了MIMO(multiple-input mul-
tiple-output)系统中存在的信道干扰（ICI, in-
ter-channel interference ）、天线间同步（IAS, in-
ter-antenna-synchronization ）和射频链路开销大等问
题，近年来，获得了广泛的关注[2~8]。文献[2~5]从获得发射分集方面提出了不同的SM 方案。其中文献[2]中Basar 等将空时分组码（STBC ）运用到SM 中，提出了空时分组码空间调制（STBC-SM, space-time block coded spatial modulation ）方案，获得了二阶的发射分集增益；文献[3]在文献[2]的基础上，进一步提出了一种基于循环结构的空时分组码空间调制方案，有效地提高了系统的频谱效率；文献[4]提出了一种对角空间调制（SM-DC, spatially modulated diagonal space time codes ）方案，该方案收稿日期：2016-11-12；修回日期：2017-06-28
基金项目：华为创新研究计划基金资助项目（No.YB2015070059）
Foundation Item: Huawei Innovation Research Program (No.YB2015070059)
doi:10.11959/j.issn.1000-436x.2017189
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