Combination Differential Direct Sequence Spread Spectrum Algorithm for Mobile Underwater Acoustic Communication
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摘要: 针对水下移动平台(AUVs)直接序列扩频(DSSS)水声通信过程中大多普勒时变带来的频偏及载波相位跳变问题，该文提出一种组合差分扩频通信方法。该方法设计一种2维组合差分(TCD)扩频帧结构，接收端通过对重复码时域加窗相关实现时变多普勒粗估计；接收端提出一种频率压缩-能量接收器(FC-ED)，通过采用能量检测接收器提高接收端处理多普勒容限，使用频率压缩法多频点压缩处理进一步提高系统鲁棒性，实现扩频码识别映射解码；最后提出一种组合差分算法，实现2维组合扩频间的极性差分解码，在能量接收映射解码基础上引入极性调制，进一步提高频谱利用率。经理论及仿真试验分析，该方法具备一定的抗时变多普勒能力，在恒加速度相对运动–8 dB信噪比条件下误码率小于10–2。Abstract: To deal with the problem of frequency offset and carrier phase fluctuation caused by the conventional Doppler on the DSSS (Direct-Sequence Spread-Spectrum) underwater acoustic communication between AUVs (Autonomous Underwater Vehicles), a combination differential direct sequence spread spectrum algorithm is proposed. The Doppler rough estimation is realized through Two-dimension Combination Difference(TCD) spread spectrum frame structure, and the Doppler tolerance is extended through the Frequency Compression-Energy Detector(FC-ED), then an algorithm of combination differential is proposed for polarity decoding. Using the combination differential direct sequence spread spectrum algorithm, good performance (BEK<10–2) is achieved for a signal-to-noise ratio as low as –8 dB based on at-sea data.
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表 1 每组码元调制信息比特数
类别 重复码PNs 排列码PNp 组合码PNc 极性调制 映射比特 $ \left\lfloor {{{\log }_2}N} \right\rfloor $ $ \left\lfloor {{{\log }_2}P_N^2} \right\rfloor $ $ (n - 2) \cdot \left\lfloor {{{\log }_2}C_N^2} \right\rfloor $ $ n $ 本文特例 5 10 72 10 
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