M元正交碼擴頻毫米波通信方案設計與性能分析
[Abstract]:With the development of wireless communication technology, 5G mobile communication has become a hot research topic, and millimeter-wave communication technology is considered as one of the key technologies of 5G mobile communication. In order to improve spectrum efficiency and transmission performance, a method of constructing M-ary orthogonal code spread spectrum signals suitable for millimeter-wave communication is proposed in this paper. Different pseudo-random sequences are used for information transmission. The error performance of the constructed signal in AWGN channel and different fading channel is analyzed theoretically and experimentally. The main work of this paper is as follows: (1) on the basis of summarizing spread spectrum communication technology, a M-ary orthogonal code spread spectrum scheme is proposed, which uses cyclic shift method to construct M-ary orthogonal code set as the reference pseudorandom code of M-ary spread spectrum. The computational complexity of the receiver is simplified and the transmission efficiency is improved. Through theoretical analysis and simulation experiments, the effects of different cyclic shift lengths and different code groups on the performance of the receiver in AWGN channel are verified. The error-code performance of M-ary orthogonal spread code signals produced by different spread spectrum codes in AWGN channel is analyzed and compared. (2) several common fading channels and their distribution characteristics are discussed. At the same time, the transmission performance of M-ary orthogonal spread spectrum code signal in AWGN channel and fading channel is analyzed in detail. By strict mathematical derivation, the M-ary orthogonal code spread millimeter wave signal in AWGN channel is obtained. The BER analytical formula for Rayleigh and Nakagami-m channels is analyzed, and numerical simulation is carried out. (3) considering the influence of multipath fading on reception performance, several fading channel diversity reception techniques, equal gain combined (MRC), are analyzed. Maximum ratio merge (EGC) and select merge (SC). In this paper, the error rate of M-ary orthogonal code spread spectrum millimeter-wave signal under the above diversity receiving technology is derived strictly, the analytical formula is given, and the corresponding computer simulation is carried out. The advantages and disadvantages of the above-mentioned diversity reception techniques are compared. (4) the research work of this paper is summarized, and the shortcomings of the research in this paper and the future research direction are pointed out.
【學位授予單位】:山東大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TN928
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