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A Demodulation Method for HF 3G-ALE Signal Based on Pre-Despreading

机译:基于预解扩的HF 3G-ALE信号解调方法

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摘要

A demodulation method for the link layer protocol information carried by HF 3G-ALE signal based on pre-despreading is researched on. This method directly makes correlation despreading on the level of baseband signal, instead of making octal symbol demodulation. The experiment results show that compared with the demodulation method based on post-despreading, this method has better robustness to carrier frequency estimation error. Meanwhile, the demodulation performance is superior under the condition of low signal-to-noise ratio and low oversampling rate within a certain range of signal synchronization error, so that this method is more applicable for implementation requirement of non-cooperative communication countermeasure.
机译:研究了基于预解扩的HF 3G-ALE信号携带的链路层协议信息的解调方法。该方法直接在基带信号的电平上进行相关解扩,而不是进行八进制符号解调。实验结果表明,与基于后解扩的解调方法相比,该方法对载波频率估计误差具有更好的鲁棒性。同时,在一定的信号同步误差范围内,在低信噪比和低过采样率的情况下,解调性能优越,因此该方法更适用于非合作通信对策的实现要求。

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