3G-ALE短波信号信道化接收机高效设计

Efficient Design of Channelized Receiver for 3G-ALE Short-Wave Signal

快速选频建链对提高短波通信系统的接通率和通信质量至关重要,针对第三代自动链路建立(3G-ALE)短波信号频率较低、信道带宽窄、信道个数多的特点,设计了一种基于加权叠接相加(WOLA)滤波器组的射频直采信道化接收机,同时,提出了信道组内有效信道全覆盖的方式,能够使建链时间缩短为单路接收时的1/511。在高斯白噪声信道下进行了仿真,当SNR低至-9 dB时同步捕获概率甚至可以达到100%,当SNR高于24 dB时误码率为0。与单路接收相比,该信道化接收机不会因为并行接收而降低信号接收质量。

Fast frequency selection and link establishment is a crucial factor to improve the completion rate and the communication quality of short-wave communication system.For the third generation of automatic link establishment(3 G-ALE)short-wave signal with low working frequency,narrow channel bandwidth and large amounts of channel,an efficient channelized receiver based on weighted overlap and add(WOLA)filterbanks is designed,in which the radio signal is direct sampled,shifted to baseband and low-pass filtered.Meanwhile,a channel partition method with the effective channels covering the entire channel group is proposed,which can shorten the link establishment time to 1/511 of that of single channel receiving.In AWGN channel,the simulation results show that when SNR is-9 dB the synchronous acquisition probability even reaches 100%,and when SNR is higher than 24 dB the bit error rate reaches 0.This indicates that compared with single channel receiving,the signal quality of the designed receiver is not lowered due to multichannel parallel receiving.