Spatial Modulation Technology In Wireless Communications

With the ever increasing requirement for higher data rates and improved QoS (Quality of Service) across wireless links, the improvement of the spectral efficiency and reliability in wireless communication system is needed in the extreme. The way to use the limited resource to get higher data rates and better spectral efficiency is of paramount importance in next generation cellular communication. Multiple-Input Multiple-Output (MIMO) technology can attain this by transmitting multiple data streams from multiple antennas. However, the capacity gain of MIMO system depends strongly on transmit and receive antenna spacing, transmit antenna synchronization and the used algorithm complexity to reduce the interchanne interference (ICI) at the receiver. However, Spatial Modulation (SM) proposed in this paper can overcome these shortcomings of MIMO efficiently under the higher spectral efficiency.As a novel multiple antenna transmission scheme, SM technology maps several information bits into a constellation point in the signal and spatial domain, i.e. carrying some information by the physical location of the particular transmitting antenna. Meanwhile, at the receiver, a transmit antenna number detection algorithm called normalized maximum ratio combining (NMRC) is used to estimate both the transmitted signal and the transmit antenna number. The simulation results are compared with ideal Vertical-Bell Lab Layered Space-Time (V-BLAST) system and MRC system. It is shown that bit error rate (BER) performance of SM system outperforms other techniques. In addition, under the same spectral efficiency, SM system has a vast reduction in receiver complexity compared with V-BLAST system.The thesis discusses firstly the study status of SM technology at home and abroad in the first chapter and the related theories in chapter two, which lay a theoretical foundation for research. According to the feature and limitation of SM, the third chapter studies SM system based on antenna selection, which is an important breakthrough in the limitation of transmit antenna number in original SM system. The chapter four increases channel estimation module in the original SM system, so that the study in this paper can be more appropriate in the real situation of wireless communication. At last, according to the related cooperative communication theory, it is proved that it's feasible to apply SM technology to cooperative relays in fifth chapter. Meanwhile, it is shown that SM technology can focus on the application in cooperative wireless sensor networks. In conclusion, SM technology is being improved and promoted through extensive researches from several aspects in this paper.