基于CRC校验的解码后合并方法

Combined Method after Decoding with CRC Check

由于远距离短波通信的复杂性,使得接收信号的幅度、相位发生剧烈的变化,这样在接收端就必须采用抗信道衰落的技术。各种抗衰落技术中,又属分集接收技术为最有效的抗击衰落的技术之一。针对一种远距离短波通信的多台站接收模型下,简单分析了分集技术下3种合并方式的性能,但由于分集接收实现过于复杂的缺点,参照该模型提出了一种在实际环境下易于实现的解码后合并方法,仿真给出了该方法的性能上下界,结果表明该方法在低信噪比环境下能够取得接近甚至优于3种分集合并的性能,给实际通信过程中合并方式的选择提出了有效的参考。

For the complexity of long-distance HF communication, the amplitude and phase of the received signals have a dramatic change, so the anti-fading techniques must be employed at the receiving end. Among the various anti-fading techniques, diversity reception technology is one of the most effective techniques for combating the decline. For a multi-station received model of the long-distance shortwave communication, the article gives a simple analysis on the performance of the three diversity combined methods. However, for the diversity reception is too complex to implement, thus according to the model, a method of combination after decoding is proposed, which could be easily implemented in the practical environment, and the lower and upper bounds of the performance are given through simulation, the results show that the method could be close to or better than the three kinds of diversity combination in low SNR environments. This article provides some valuable reference for the choice of combining way in the actual communication process.