便携极低速对流层散射通信系统优化设计

针对便携极低速对流层散射通信系统的远距离应用,在分析散射信道快衰落特性的基础上,提出便携极低速通信系统分集接收方案,并给出不同分集重数情况下的误码性能理论曲线,在此基础上提出采用失真自适应接收的抗多径波形以获取最大隐分集增益,设计并实现高效低时延LDPC编码和窄带滤波器。仿真结果表明,纠错编码可获得5 d B编码增益,窄带滤波解决了极低速远距离通信存在的多普勒效应问题。在系统测试平台上对便携极低速散射通信系统性能进行实测,测试结果表明,该优化设计方案可有效提升系统能力。

Optimized Design on Portable Extreme-Low Rate Troposcatter Communication Systems

Aiming at the long-distance application of portable extreme-low speed troposcatter communication system,based on the analysis of fast-fading characteristics of channel,the diversity receiving scheme of portable extreme-low speed communication system is proposed,and the theoretical curve of performance under different diversity is given. On this basis,the anti-multipath waveform received by distortion adaptive receiver is proposed to obtain the maximum hidden diversity gain,and the high-efficiency and low-delay LDPC and narrow-band filter are designed and implemented. The simulation results show that the error correction coding can obtain 5dB coding gain and the narrowband filtering can solve the doppler effect problem in the extreme-low speed long-distance communication. The performance of portable extreme-low speed troposcattering communication system is measured on the system test platform,and the test results show that the optimal design scheme is feasible and can improve the system capability.