Improved Parallel Combinatory Spread Spectrum Underwater Acoustic Communication Based on Gold Codes
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摘要: 将映射序列扩频(MSSS)方法用于并行组合扩频(PCSS)水声(UWA)通信，有效降低通信信号峰均比，进而提高通信性能。但当使用Gold码作为扩频码时，由于Gold码的循环移位相加特性，导致映射信号在接收端解相关时会出现伪峰，严重降低通信系统的性能。为了减小伪峰对通信性能的影响，该文提出基于相关峰相位差法的并行组合扩频(PDCP-PCSS)和交织并行组合扩频(IPCSS)两种方法。PDCP-PCSS方法在接收端加入相关峰相位差法对伪峰进行识别和剔除，有效降低了伪峰对通信性能的影响。IPCSS方法将交织技术与并行组合扩频相结合，避免了伪峰的生成。通过仿真和海上试验验证，这两种方法相比于传统的并行组合扩频水声通信(CPCSS)方法具有更好的通信性能，PDCP-PCSS方法的通信性能最优，但适用范围仅限于3个Gold码的组合，而IPCSS方法的适用范围更广。Abstract: When Mapping Sequences Spread Spectrum (MSSS) method is applied to the Parallel Combinatory Spread Spectrum (PCSS) UnderWater Acoustic (UWA) communication, the peak-to-mean envelope power ratio of the output signal is reduced, and hence the communication performance is improved. However, if Gold codes are selected as the spread sequence, due to the property of Gold codes, there will be a pseudo correlation peak when the mapping signal is correlated with the spread sequence set. Hence, the communication performance is degraded seriously. In order to overcome the performance degradation, two new schemes are proposed in this paper, namely the Parallel Combinatory Spread Spectrum based on Phase Differences of Correlation Peaks (PDCP-PCSS) and the Interleaved Parallel Combinatory Spread Spectrum (IPCSS) respectively. PDCP-PCSS can effectively identify the pseudo correlation peak and eliminate it. IPCSS is able to generate signal without the pseudo correlation peak by adding the interleavers in the transmitter. Simulation and sea trail results show that the performance of two proposed schemes in the paper outperform the Conventional Parallel Combinatory Spread Spectrum (CPCSS). Among them, the performance of PDCP-PCSS is the best. However it is only suitable for the combination of three Gold codes while IPCSS has less limitation in usage.
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表 2 3种通信方法在不同水听器下的误比特数
水听器编号 CPCSS PDCP-PCSS IPCSS 1号 0 0 0 2号 0 0 0 3号 3 0 0 4号 3 0 0 5号 0 0 9 6号 0 0 0 7号 0 0 0 8号 29 0 0 9号 20 0 2 10号 21 0 0 
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