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本文介绍一种中等速率时频相数字对流层散射调制解调器同步方案,其特点是发端在信号调制同时注入同步信息,在收端用包络检波,窄带滤波器提取同步。设备简单可靠并有很好的抗噪声及抗衰落性能,实际测试结果和计算值十分接近。
This paper introduces a scheme of mid-rate and time-frequency digital stratospheric scatter modem synchronization, which is characterized in that the originator injects synchronization information at the same time as the signal modulation, envelope detection at the receiving end and narrowband filter. Equipment is simple and reliable and has good anti-noise and anti-fading performance, the actual test results and calculated values are very close.