Iterative receiver for the triple differential PSK modulation in the time‐varying underwater acoustic communications. Issue 16 (22nd September 2020)

• Record Type: Journal Article
• Authors: Cui, Hongyu; Liu, Changxin; Si, Boyu; Wu, Jie; Sun, Dajun
• Is Part Of: IET communications. Volume 14:Issue 16(2020)
• Page Start: 2813
• Page End: 2819
• Publication Date: 2020-09-22
• Subjects: iterative decoding -- differential phase shift keying -- transceivers -- underwater acoustic communication -- spread spectrum communication -- interleaved codes -- modulation coding -- signal detection -- demodulation -- wireless channels -- time‐varying channels -- phase noise -- convolutional codes -- channel coding; iterative receiver -- triple differential PSK modulation -- time‐varying underwater acoustic communications -- time‐varying property -- underwater acoustic channel -- Doppler spread -- direct‐sequence spread‐spectrum communications -- relative velocity variation -- transmitter -- phase rotation -- magnitude loss -- DSSS packet -- novel transceiver design -- UWA DSSS communications -- phase noise -- signal‐to‐noise ratio loss -- iterative decoding algorithm -- SNR loss -- channel variation -- local reference signal -- performance gain -- UWA channel -- receiver -- triple differential phase shift keying modulation -- D3PSK modulation -- improved bit‐interleaved coded modulation -- D3PSK demodulator -- convolutional decoder -- linear prediction -- adaptive selection -- correlation loss recovery -- performance loss mitigation -- motion acceleration; Telecommunication systems -- Periodicals; Speech processing systems -- Periodicals; 621.38205
• DOI: 10.1049/iet-com.2020.0513
• Languages: English
• ISSNs: 1751-8628

Abstract

Abstract : Due to the time‐varyingproperty of the underwater acoustic (UWA) channel, the significant Doppler spread will severely degrade the performance of direct‐sequence spread‐spectrum (DSSS) communications. The relative velocity variation between the transmitter and the receiver will cause both the phase rotation and the magnitude loss of correlation peak, during the long transmission of the DSSS packet. To solve this problem, the authors propose a novel transceiver design for the UWA DSSS communications. At the transmitter, the triple differential phase shift keying (D 3 PSK) modulation is adopted to overcome the phase rotation, whereas the phase noise will be amplified resulting in the signal‐to‐noise ratio (SNR) loss. At the receiver, the improved bit‐interleaved coded modulation with iterative decoding algorithm for D 3 PSK is used to recover the SNR loss, in which the D 3 PSK demodulator is treated as the convolutional decoder, and the linear prediction is adopted to track the channel variation. Furthermore, an adaptive selection of local reference signal is also applied to recover the correlation loss. Theoretical simulation shows that the proposed transceiver can effectively mitigate the performance loss caused by the motion acceleration, and the performance gain is significant over the conventional.