CAJ | 학술논문

为了研究级联编码对DS／BPSK系统性能的影响，设计了一种基于RS与卷积码级联编码的DS／BPSK系统，分析了该级联编码直扩系统的性能，仿真了在纠错编码参数发生改变时的系统性能。仿真结果表明，级联编码的DS／BPSK系统性能比单码编码的DS／BPSK系统性能要好。在RS码参数保持不变时，降低卷积码的码率，采用软判决方式译码以及多比特软判决，能有效提升系统性能；同时，交织在一定程度上能改善系统的性能。
위료연구급련편마대DS／BPSK계통성능적영향，설계료일충기우RS여권적마급련편마적DS／BPSK계통，분석료해급련편마직확계통적성능，방진료재규착편마삼수발생개변시적계통성능。방진결과표명，급련편마적DS／BPSK계통성능비단마편마적DS／BPSK계통성능요호。재RS마삼수보지불변시，강저권적마적마솔，채용연판결방식역마이급다비특연판결，능유효제승계통성능；동시，교직재일정정도상능개선계통적성능。
To investigate the effect of concatenated coding scheme on DS/BPSK communication system, a RS and convolutional code concatenated DS/BPSK system was designed, the performance analysis of the proposed coded system was presented and the performance comparison when the system employed different error correction parameters was simulated. Simulation results demonstrate that the concatenated coding scheme in the DS/BPSK outperforms single code coding scheme. With the RS code parameters fixed,when the eonvolution code rate is lower and the decoding decision type is soft - decision with more decision bits, the system performance would be better. In addition, interleaving is an effective method to improve system performance to some extent.