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第三代短波自动链路建立系统(3G-ALE)的发送波形采用了多进制正交扩频和截尾卷积码技术。将比特软值提取值算法与环绕Viterbi算法(WAVA)相结合,将正交扩频解调的比特软值用于WAVA译码算法,从而改进了3G-ALE系统译码算法。仿真结果表明,新的译码算法与传统的硬判决算法相比性能有较大提高,在误帧率为10-2时性能在传统算法基础上提高了2.2dB。
The third generation of short-wave automatic link establishment system (3G-ALE) sending waveform using multi-ary orthogonal spreading and tailing convolutional code technology. The bit soft value extraction algorithm is combined with the surround Viterbi algorithm (WAVA), and the bit soft value of orthogonal spread spectrum demodulation is used in the WAVA decoding algorithm to improve the decoding algorithm of 3G-ALE system. The simulation results show that the performance of the new decoding algorithm is greatly improved compared with the traditional hard-decision algorithm. When the frame error rate is 10-2, the performance is improved by 2.2dB based on the traditional algorithm.