失真自适应接收机技术及信号形式选择

对流层散射信道是一种典型的多径衰落信道,多径传播造成了信号的深衰落和多径扩散。而多径扩散现象的存在,会使速率高、码元窄、频谱宽的信号遭受频率选择性衰落的影响,造成传输中的信号码元之间产生码间干扰,严重影响信息传输质量。在此提出了一种基于失真自适应接收技术和3/4占空半余弦信号形式的数字接收机方案,能够自适应地跟踪失真信号的变化而进行最佳相干接收,使系统具有稳定的通信性能。

Research on Distortion Adaptive Receiver and Selection of Signal Format

The troposeatter channel is a typical multipath fading channel, and the multipath propagation causes the serious deep lading and muhipath spread. The muhipath spread will make the signals with high rate, narrow symbol and wide spectrum suffer the influence of frequency selectivity fading and cause ISI between symbols in the transmission to affect seriously the information transmission quality. In this paper, we present a new digital receiver scheme based on DAR and 3/4 duty cycle haft cosine signal format, which is able to track the variation of distortion signal and perform optimal correlation receiving and make the system have stable communication performance .The tests show that the performance of the scheme can make the system have better performance compared with traditional techniques.