利用金码映射序列扩频水声通信的研究

Yan Li, Biaodi Liu, Ning Jia, Jianchun Huang, D. Xiao, Shengming Guo
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引用次数: 0

摘要

并行组合扩频(PCSS)是提高扩频通信系统数据速率的一种解决方案。然而,当多个扩频序列组合时,包络线不是恒定的,从而降低了能量效率。因此,引入映射序列扩频,在传输前将三个扩频序列变换成一个恒定的包络序列,可以同时传输三个序列。映射序列扩频可以有效降低PCSS信号的峰均功率比(PAPR)。但是,映射序列扩频仍然存在一个问题:当三个Gold码组合并映射成一个二值序列时,当接收信号与M个可能传输信号的归一化副本相关时,会出现一个干扰Gold码导致的伪相关峰。本文提出了一种基于相关峰相位差法(PDCP-PCSS)的PCSS水声通信系统,该系统通过判断相关峰的相位差来识别和消除伪相关峰。与传统的并行组合扩频水声通信方法相比,该方法能有效提高映射序列扩频通信系统的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Study of Mapping Sequences Spread Spectrum Underwater Acoustic Communications Using Gold Codes
Parallel combinatory spread spectrum (PCSS) is a solution to increase the data rate of spread spectrum communication system. However, when multiple spread spectrum sequences are combined, the envelope is not constant, which will consequently reduce the energy efficiency. Hence, mapping sequences spread spectrum is introduced, which can simultaneously transmit three sequences by transforming three spread spectrum sequences into a constant envelope sequence before transmission. The mapping sequences spread spectrum can effectively reduce the peak-to-average power ratio (PAPR) of the PCSS signal. However, there is still a problem with mapping sequences spread spectrum: when three Gold codes are combined and mapped into a binary sequence, a pseudo correlation peak will appear caused by an interference Gold code when the received signal is correlated with normalized replicas of M possible transmission signals. In this paper, a PCSS underwater acoustic communication system based on the phase differences of correlation peaks method (PDCP-PCSS) is proposed, which can identify and eliminate the pseudo correlation peak by judging the phase differences of the correlation peaks. Compared with the conventional parallel combinatory spread spectrum underwater acoustic communication method, the proposed method can improve the performance of mapping sequences spread spectrum communication system effectively.
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