Research on mobile spread spectrum underwater acoustic communication

Abstract

Direct-sequence spread-spectrum (DSSS) underwater acoustic (UWA) communication can obtain considerable matching processing gain at the receiving end, which is the preferred communication method for high quality underwater acoustic communication. However, under the mobile condition, the DSSS receiving signal will face fast carrier phase fluctuation interference, resulting in a serious degradation of the matching processing gain at the receiving end. Aiming at this problem, this paper proposes a dual differential spread-spectrum (DDSS) UWA communication technology: double differential encoding of the original information sequence at the transmitting end; dual-difference correlation detector for decoding at the receiving end, which can effectively suppress fast carrier phase interference. The simulation results show that the DDSS UWA communication can achieve -8dB SNR robust acoustic communication under the condition of relative motion speed of 8m/s, and the communication error rate is less than 10−3.