Research on spread spectrum communication system of underwater vessels
The underwater acoustic communication method used for communication on underwater vessels is confronted with severe signal attenuation in long-distance transmission,and due to the requirement of concealment,the signal power is limited and is affected by multipath interference and ocean background noise interference in a superposition manner,resulting in high communication error rate.Therefore,this article proposes the study of underwater vessel spread spectrum communication system.A spread spectrum communication system is designed,and the spread spectrum communication system is utilized to expand transmission bandwidth,so as to improve communication signal-to-noise ratio(SNR)under long-distance attenuation.Pseudo-random code m-sequences and OPS sequences similar to white noise are used as spreading codes to construct an encoding sequence set,so as to get rid of white noise interference,multipath interference and code division multiple access(CDMA).The test results show that under the same conditions,the spread spectrum communication using m-sequences yields better results and can achieve reliable communication with an error rate below 1%at-25 dB.After the modulation with the proposed method,noise interference and multipath interference are eliminated,and the attenuated high-frequency signal is enhanced,so the problems of long-distance attenuation,multipath interference and background noise interference in underwater communication are eliminated.
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