The Architecture And Technical Research Of Medical Information Interaction And Sharing In Regional

The development trend of wireless communication is higher spectrum efficiencyand higher data rate broadband transmission. MIMO technology has become the keytransmission technology of fourth generation wireless communication because of itssufficient system capacity and high spectrum efficiency. Spatial modulation (SM) is aclass of recently developed MIMO wireless transmission techniques in which theindices of the transmit antennas are considered for modulation. The special structure ofSM-MIMO can effectively simplify the inter-antenna synchronization (IAS), interchannel interference (ICI) and antenna configurations problems of conventional MIMOtechniques. Therefore, more and more scholars pay attention to this new technology.This paper studies the SM-MIMO key enhanced transmission technology in thebroadband wireless communication system, combining with the multi-carrier andsingle-carrier technologies, including orthogonal frequency division multiplexing(OFDM) and single-carrier frequency domain equalization (SC-FDE) technology. Theproposed algorithms optimized the SM-MIMO system from the perspective ofcomplexity, the transmission performance and spectrum utilization respectively.Specific studies include: SM-OFDM non-coherent detection algorithm, low complexitySM-SC-FDE near maximum likelihood detection algorithm, time domain detectionalgorithm in single radio link and the high spectrum efficiency detection algorithm insaving cyclic prefix of SM-OFDM and SC-FDE system. Above detection algorithmsperformance are validated by computer simulation.Chapter1introduces the development of the traditional MIMO system, theresearch status of spatial modulation, as well as the primary innovation of this paper.Chapter2explores two differential detection schemes for SM-OFDM systems.Firstly, a differential SM-OFDM scheme based on the design of single-antennadifferential modulation is proposed, which is not conducive to expansion because of therestrains on the abs of the channel frequency domain coefficients. Then, an improveddifferential SM-OFDM based on the design of single-antenna differential modulation scheme is proposed, which is conducive to expansion.Chapter3investigates the detection algorithms in single-carrier systems of spatialmodulation. Firstly, for SM-SC-FDE system, it presents a low-complexity nearmaximum likelihood (ML) detection algorithm. Simulation illustrates that the proposednear maximum likelihood (ML) detection algorithm can reduce the complexity of thesystem without bit error rate (BER) performance penalty. Then, another detectionalgorithm for spatial modulation single carrier in the case of a receiving antenna isinvestigated. So that the transmitter and receiver exploit only a radio-frequency unit,which can greatly reduce the cost of hardware implementation.Chapter4studies the detection algorithm for high spectral efficiency SM-OFDMand SM-SC-FDE system. In this chapter, an algorithm through saving the cyclic prefixto improve the spectrum efficiency of the spatial modulation system is presented.Chapter5draws the conclusion about this paper and states the possible futureresearch technology of SM system and other novel MIMO system.