并行组合扩频系统伪码同步相关技术研究

发布时间：2018-11-12 19:33

【摘要】：并行组合扩频通信是一种有着较高频带利用率的扩频通信方式,带来通信效率提升的同时继承了传统扩频技术抗干扰、低截获概率、良好的多址通信能力等优势,适用于猝发扩频通信、高信息速率扩频通信等应用场合,有着广泛的应用前景。并行组合扩频通信方式中信息由多伪码等幅度叠加后扩频调制,伪码的捕获需要解决伪码间互相关干扰及计算量增加等问题,是系统需解决的难点,研究符合组合伪码特性的同步捕获方式成为必要。本文结合并行组合扩频系统原理及参数特点,研究符合系统特性的伪码捕获方式,主要研究内容包括以下几个方面:(1)针对组合伪码的相关代数和特性,结合公式推导与仿真分析提出一种适合于组合伪码的自同步捕获方式,即组合伪码与本地的多条序列样本伪码分别相关,根据系统的调制参数选择其中较大的相关值相加作为捕获备选峰值。这种方法提高了系统接收端的捕获概率,增强了系统的抗干扰能力。(2)结合得出的组合伪码捕获方式,将应用于单伪码捕获的同步头、滑动相关、匹配滤波、快速傅里叶(Fast Fourier Transformation,FFT)捕获算法等应用于组合伪码的捕获,提出了几种捕获方案。仿真验证每种方案的捕获概率与应用在系统中的误码率,通过比较分析,得出FFT捕获算法可以解决多伪码调制方式带来的复杂运算量问题,且方案具有优良的捕获性能。(3)分析了并行组合扩频中调制参数对组合伪码捕获概率的影响。考虑并行组合扩频系统中通信效率、误码率性能、实现复杂度等几个方面,讨论了自同步方式下系统调制参数的选取,给出了备选参数范围。
[Abstract]:Parallel combined spread spectrum communication is a kind of spread spectrum communication mode with high bandwidth efficiency, which not only improves the communication efficiency, but also inherits the advantages of traditional spread spectrum technology, such as anti-jamming, low probability of interception, good multi-access communication ability, and so on. It is suitable for burst spread spectrum communication and high information rate spread spectrum communication. In the parallel combinatorial spread spectrum communication mode, the information is modulated by multiple pseudo-codes with equal amplitude superposition, and the acquisition of pseudo-codes needs to solve the problems of cross-correlation interference between pseudo-codes and the increase of calculation amount, which is a difficult problem to be solved in the system. It is necessary to study the synchronization acquisition method which accords with the characteristic of combined pseudo code. Combined with the principle and parameter characteristics of parallel combinatorial spread spectrum system, this paper studies the acquisition method of pseudo code which accords with the system characteristics. The main research contents are as follows: (1) aiming at the correlation algebra and characteristic of combined pseudo code, In combination with formula derivation and simulation analysis, a self-synchronization acquisition method suitable for combined pseudo-codes is proposed, that is, the combination pseudo-codes are correlated with local multiple sequence sample pseudo-codes, respectively. According to the modulation parameters of the system, the larger correlation value is selected as the acquisition alternative peak value. This method improves the acquisition probability at the receiving end of the system and enhances the anti-jamming ability of the system. (2) combined with the combined pseudo code acquisition method, the method is applied to the synchronization head of single pseudo code acquisition, sliding correlation, matching filtering, and so on. Fast Fourier (Fast Fourier Transformation,FFT (FFT) acquisition algorithm is applied to the acquisition of combined pseudo codes, and several acquisition schemes are proposed. The acquisition probability of each scheme and the bit error rate applied in the system are verified by simulation. Through comparison and analysis, it is concluded that the FFT capture algorithm can solve the complex computation problem caused by multi-pseudo-code modulation. The scheme has excellent capture performance. (3) the influence of modulation parameters in parallel combinatorial spread spectrum on the acquisition probability of the combined pseudo code is analyzed. Considering several aspects such as communication efficiency, bit error rate performance and implementation complexity in parallel combinatorial spread spectrum system, the selection of modulation parameters in self-synchronization mode is discussed, and the range of alternative parameters is given.
【学位授予单位】：哈尔滨工程大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN914.42

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