基于二重选择性分集的海事短波数字通信性能分析

从目前船舶海事短波通信的现状出发,对采用ARQ技术的数字窄带直接印字电报(NBDP)传输信息恒比码码组的回传概率和剩余错组率进行了分析,指出了现行短波通信存在的缺点和不足。提出将二重选择性接收分集技术用于海上短波通信的想法,并对改进后的系统性能参数进行了理论和数值分析。在信噪比同样的条件下,得出了使用天线选择性二重分集技术的海上短波通信系统能有效地提高通信质量和降低ARQ的重传概率和剩余错组率。结论为更好地利用短波通信系统进行海事数字通信提供理论依据。

Performance of Maritime Short-Wave Digital Communication Based on Two-Branch Selective Diversity Technology

Starting from the present situation of maritime vessel short-wave communication(SWC) systems,the feedback percentage and remaining block error rate of transmission constant bit coding blocks over digital narrow-band direct printing(NBDP) employing automatic request for repetition(ARQ) technology are investigated,and the defects of current SWC are pointed out.An approach of using two-branch selective receive diversity is proposed for SWC systems,and the performance coefficients of the improved system are analyzed theoretically and numerically.Under the condition of same signal-to-noise ratio(SNR),the maritime SWC systems employing two antennas selective diversity can improve their transmission quality effectively and also reduce their feedback percentage of ARQ and remaining block error rate.It provides a theoretical guidance for maritime numerical communication of using SWC systems.