并行组合扩频系统误比特率公式的改进及主要参数的优化

Improvement of bit error rate formula and optimization of main parameters in parallel combinatory spread spectrum system

分析并行组合扩频系统的运行原理,改进原有误比特率公式。为实现并行组合扩频系统主要参数的优化选取,结合系统误比特率公式分析主要参数对误码性能的影响。最后,综合研究结果给出并行组合扩频系统主要参数的选取原则。研究结果表明:在相同信噪比条件下,当正交扩频序列总数固定时,系统误码性能随着每次选取发射的正交扩频序列数的增加而迅速降低;而当每次选取发射的正交扩频序列数固定时,系统的平均误比特率随正交扩频序列总数增加而阶梯状下降,但系统的复杂度随之增加而呈线性增加。

The operation principle of parallel combinatory spread spectrum （PCSS） system was analyzed, and the new bit error rate （BER） formula improved from original formula was derived. In order to optimize the main parameters of PCSS system, the influence of BER performance caused by the main parameters was mainly investigated combining the BER formulary. Finally, the selection principle of the main parameters was indicated in PCSS system. The research results show that under the same condition of signal-to-noise ratio, when the set number of pseudo-noise sequences is fixed, the BER performance decreases quickly while the number of selected pseudo-noise sequences increases. When the number of selected pseudo-noise sequences is fixed, the system performance （BER） decreases by stages when the set number of pseudo-noise sequences increase; however, the system complexity rises when the set number of pseudo-noise sequences increases linearly.