Star-QAM Signaling Constellations for Spatial Modulation
Star-QAM Signaling Constellations for Spatial Modulation
复制标题
DOI：
10.1109/tvt.2014.2306986
复制
发表时间：
2014-02
影响因子：
6.8
通讯作者：
Ping Yang;Yue Xiao;Bo Zhang;Shaoqian Li;M. El-Hajjar;L. Hanzo
中科院分区：
文献类型：
--
作者：
Ping Yang;Yue Xiao;Bo Zhang;Shaoqian Li;M. El-Hajjar;L. Hanzo
空间调制（SM）辅助的多输入多输出（MIMO）通信系统的性能高度依赖于所采用的特定幅度/相位调制（APM）信号星座。在本文中，我们设想新的星形正交幅度调制（星形QAM）辅助SM方案。我们的目标是最小化系统的平均比特错误概率（ABEP）。更具体地说，一类新的星型QAM星座被引入SM，这是能够灵活地适应环比的幅度水平。然后，在特定的MIMO配置和预定的传输速率下，提出了一种简单有效的环比优化算法，以最小化ABEP。此外，为了进一步提高我们的星形QAM辅助SM方案的性能，提出了一种对角预编码技术，并设想了一种低复杂度的基于最小距离的方法来提取预编码参数。我们的数值结果表明，建议的星QAM辅助SM安排提供了有益的系统性能的改善相比，相同的吞吐量最大最小距离（MMD）QAM和相移键控（PSK）基准。此外，我们的预编码方案是能够进一步提高可达到的系统性能在一个温和的反馈要求。
The performance of spatial modulation (SM)-assisted multiple-input-multiple-output (MIMO) communication systems is highly dependent on the specific amplitude/phase modulation (APM) signal constellation adopted. In this paper, we conceive new star-quadrature amplitude modulation (star-QAM)-aided SM schemes. Our goal is to minimize the system's average bit error probability (ABEP). More specifically, a new class of star-QAM constellations is introduced for SM, which is capable of flexibly adapting ring ratios of the amplitude levels. Then, under a specific MIMO configuration and a predetermined transmission rate, a simple and efficient ring-ratio optimization algorithm is proposed to minimize the ABEP. Moreover, to improve further the performance of our star-QAM-aided SM scheme, a diagonal precoding technique is proposed, and a low-complexity minimum-distance-based approach is conceived for extracting the precoding parameters. Our numerical results show that the proposed star-QAM-aided SM arrangement provides beneficial system performance improvements compared with the identical-throughput maximum-minimum distance (MMD) QAM and phase-shift keying (PSK) benchmarkers. Moreover, our precoding scheme is capable of further improving the attainable system performance at a modest feedback requirement.