并行組合擴頻系統(tǒng)偽碼同步相關技術研究
[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.
【學位授予單位】:哈爾濱工程大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TN914.42
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