M元正交码扩频毫米波通信方案设计与性能分析

发布时间：2018-12-14 18:22

【摘要】：随着无线通信技术的不断发展,5G移动通信成为当下的研究热点,而毫米波通信技术被认为是5G移动通信的关键技术之一。为提高频谱效率和传输性能,本文提出了一种适用于毫米波通信的M元正交码扩频信号构造方法,利用不同伪随机序列进行了信息传输,并对所构造的信号在AWGN信道和不同衰落信道下的误码性能进行了理论分析和实验验证。论文的主要工作如下:(1)在综述扩频通信技术的基础上,提出了一种M元正交码扩频方案,利用循环移位的方法构造M元正交码组,作为M元扩频的基准伪随机码,简化了接收端的计算复杂度,提高了传输效率;通过理论分析和仿真实验验证了所提方案在AWGN信道下,不同循环移位长度以及不同码组数对接收机误码性能的影响;分析对比了不同扩频码所产生的M元正交扩频码信号在AWGN信道下的误码性能。(2)对几种常见的衰落信道以及各自的分布特点进行论述,同时对本文所提M元正交扩频码信号在AWGN信道以及在衰落信道中的传输性能进行了详细的分析,通过严格的数学推导,得出了M元正交码扩频毫米波信号在AWGN信道、Rayleigh和Nakagami-m信道下的误码率解析式,并进行了数值仿真。(3)考虑多径衰落对接收性能的影响,分析了几种衰落信道分集接收技术——等增益合并(MRC)、最大比合并(EGC)和选择合并(SC)。分别对本文所提M元正交码扩频毫米波信号在上述分集接收技术下的误码率进行了严格的数学推导,给出了解析式,同时进行了与之对应的计算机仿真,并比较了上述几种分集接收技术的优缺点。(4)对本文研究工作进行了总结,指出了文中研究存在的不足以及下一步的研究方向。
[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.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN928

【相似文献】