CAJ | 학술논문

为了进一步提高直接序列扩频(direct sequence spread spectrum,DSSS)系统的抗多径衰落性能,提出一种改进型的实用瑞利衰落信道模型,并在不同条件下研究了码长、扩频增益对其性能的影响.通过构建信道的动态模型,给出了 DSSS 通信系统良好的抗多径衰落性能,以及误码率(bit error rate,BER)与信噪比(noise-signal ratio,SNR)的关系曲线,对DSSS系统在多径瑞利衰落信道中传输时的抗多径衰落性能进行比较分析.Matlab仿真结果表明:与提高系统扩频增益相比,在多径衰落信道较强的条件下,增加 PN 码的码长能够更有效地提高系统抗多径衰落性能.
위료진일보제고직접서렬확빈(direct sequence spread spectrum,DSSS)계통적항다경쇠락성능,제출일충개진형적실용서리쇠락신도모형,병재불동조건하연구료마장、확빈증익대기성능적영향.통과구건신도적동태모형,급출료 DSSS 통신계통량호적항다경쇠락성능,이급오마솔(bit error rate,BER)여신조비(noise-signal ratio,SNR)적관계곡선,대DSSS계통재다경서리쇠락신도중전수시적항다경쇠락성능진행비교분석.Matlab방진결과표명:여제고계통확빈증익상비,재다경쇠락신도교강적조건하,증가 PN 마적마장능구경유효지제고계통항다경쇠락성능.
To improve the performance of anti-multipath fading of the communication system of direct sequence spread spectrum (DSSS), a new improved practical Rayleigh channel model is put forwards, and the impact of code length &spread spectrum gain is researched in the different condition. Through building the dynamic model of channel, give anti-multipath fading capability of DSSS communication system, and the relationship curves of the bit error rate (BER) and noise-signal ratio. Analysis and compare DSSS system’s anti-multipath fading capability on multipath Rayleigh channel. Matlab simulation result shows, the anti-multipath fading performance improved by the way of increasing PN code length is better than that by the way of increasing the spread spectrum gain in the condition of strong multipath fading.