多天線下行鏈路中的空時傳輸技術(shù)研究
[Abstract]:Multi-input multiple-output (Multiple Input Multiple (MIMO) technology can provide higher system capacity and reliability for wireless communication transmission. It is an important research topic in the field of wireless communication. Spatial diversity (Spatial Diversity), techniques such as spatial multiplexing (Spatial Multiplexing) and spatial modulation (Spatial Modulation) have their respective advantages and are suitable for different transmission environments. In the above techniques, spatial diversity uses spatial and temporal dimensions to jointly encode multiple copies of a data stream and gain multiple paths at the receiving end, which overcomes the influence of channel fading and improves the performance of the system. As the most common and typical spatial diversity technology, space-time coding has been paid attention and studied by many scholars. The research of this paper is based on the space-time transmission technology in the downlink multi-antenna link, and then takes it into account the distributed antenna system and space-time coding assisted spatial modulation technology to capture higher data transmission rate. The first chapter reviews the development of wireless communication, the common technologies of downlink MIMO and the research status of space-time coding technology. The second chapter introduces three common transmission technologies in MIMO: space-time coding, space-division multiplexing and spatial modulation, and gives the system model and mathematical model of these three transmission technologies, and analyzes the advantages and disadvantages of the three transmission technologies. Then its performance is simulated and compared. In addition, the second chapter introduces the space-time coding with different number of transmit antennas, and simulates its performance. In the third chapter, the fast fading distributed MIMO channel model is introduced, and the influence of Rayleigh fading channel and Doppler effect on transmission is given. In the third chapter, the system adopts the pilot aided modulation recursive least mean square detection algorithm, so the pilot auxiliary principle and the recursive least mean square detection algorithm are expounded in detail. Furthermore, the channel model of a new distributed antenna system is introduced and compared with the traditional centralized antenna distributed system. Simulation results show that the performance of the distributed antenna system in the cell is more stable. In the fourth chapter, the space-time coding-assisted spatial modulation technology is discussed. In order to improve the data transmission rate of the system, a new space-time coding assisted spatial modulation scheme is proposed for the transmission environment with small antenna dimension. Using antenna selection technique and combining channel norm sort and minimum channel angle to group the antenna, the transmission system with three transmitting antennas is studied. Simulation results show that the proposed algorithm has better performance than the traditional spatial modulation technique using antenna selection technique. In the case of high antenna dimension, based on the traditional G4 space-time code, this paper proposes a simplified transmission scheme, which is suitable for the transmission of high antenna dimension, and the decoding complexity is very low. For this simplified joint technique, the orthogonal / quasi-orthogonal space-time codes with different bit rates are simulated, and an improved scheme for orthogonal space-time coding transmission systems is presented. The last chapter is a summary of the full text, and introduces the possible research direction in the future.
【學(xué)位授予單位】:電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TN919.3
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