Research on anti-interference capability of underwater acoustic DSSS communication system
For hydroacoustic direct sequence spread spectrum(DSSS)communication systems using periodic short codes,the research method of the anti-interference ability of the DSSS system based on the processing gain was proposed,and the anti-interference performance of the system under wideband interference,narrowband interference and single-tone interference was studied,and the anti-jamming performance of DSSS system under different interference was studied and analyzed by simulation.The results show that the DSSS system has limited ability to deal with wideband interference,and the anti-jamming performance of the DSSS system is not significantly improved compared with the non-DSSS system.The DSSS system has obvious suppression effect on narrowband interference,and its specific effect is related to the position of the interference relative to the signal carrier frequency and the interference bandwidth.The influence of single-tone interfer-ence on the performance of DSSS system is related to the position of the interference relative to the carrier frequency of the signal.In all cases where the interference frequency offset is an integer multiple of the symbol bandwidth,the system anti-jamming performance is the worst when the frequency offset is the bit bandwidth.The system is most resistant to single-tone interference when three types of interference target the signal carrier frequency with the same power.The simulation results are consistent with the experimental results,showing the feasibility and effectiveness of the research method of the anti-inter-ference capability of the hydroacoustic DSSS system based on the processing gain proposed in this paper,which provides a new method and idea for the anti-interference performance analysis of the DSSS system.
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