空间调制（SM）技术作为一种新的多输入多输出（MIMO）技术，从实现上克服了MIMO系统固有的信道间干扰（ICI）、天线间同步（IAS）等问题，并以较低复杂度改善系统性能和传输速率，其实质是将传统二维信号调制扩展为三维空间调制。典型SM技术仅激活单根发射天线工作，由此消除ICI与IAS，但也使其所获得分集增益受限。此外，SM系统还会受到信道衰落及阴影效应影响，使通信质量下降。协作通信技术可通过共享若干单天线系统天线协作构成虚拟多天线系统，来获得协作分集增益，抵抗信道衰落。本项目拟对协作空间调制技术进行深入研究，首先设计更加灵活高效的SM方案，进一步提高系统性能与传输效率，降低复杂度；继而将协作技术与高效SM技术有机融合，将调制维度扩展到信号、天线、协作中继及其结合，充分利用系统分集增益提高可靠性，并在不同系统性能目标下实现优化设计，为5G无线通信中SM系统的研究应用提供重要理论和技术支持。

Spatial modulation (SM) as a novel multiple-input multiple-output (MIMO) technology overcomes the inherent inter-channel interference (ICI) and inter-antenna synchronization (IAS) of MIMO system and improves the system performance and transmission rate with relatively low complexity. Essentially, SM extends the traditional 2 dimensional signal modulation to 3 dimensional SM. Typical SM technology commonly activates one transmit antenna. Hence, it can eliminate the ICI and IAS. However, the available diversity gain will be affected. Moreover, SM system unavoidably encounters the channel fading and shadow effect which degrade the communication performance. Cooperative communication technology can share the antennas of the single-antenna systems and realize virtual multiple-antenna system, which achieves the cooperative diversity gain and resist the channel fading effectively. In this project, we will make intensive study on the cooperative SM technology. First, we will design more flexible high efficient SM schemes to improve the system performance and transmission efficiency, and decrease the complexity simultaneously. Then, we will merge the cooperative technology with SM organically, further extend the modulation dimension to signals, antennas, cooperative relays and their combination, and take full advantages of the system diversity gains to achieve better performance. Meanwhile, we will design the optimized cooperative SM system based on different performance goals. This project will provide important theoretical and technical support for the research and application of SM system in 5G wireless communications.