Iterative receiver for the triple differential PSK modulation in the time-varying underwater acoustic communications

Due to the time-varying property 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...

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Bibliographic Details
Published in:	IET communications Vol. 14; no. 16; pp. 2813 - 2819
Main Authors:	Cui, Hongyu, Liu, Changxin, Si, Boyu, Wu, Jie, Sun, Dajun
Format:	Journal Article
Language:	English
Published:	The Institution of Engineering and Technology 06.10.2020
Subjects:	adaptive selection channel coding channel variation convolutional codes convolutional decoder correlation loss recovery D3PSK demodulator D3PSK modulation demodulation differential phase shift keying direct‐sequence spread‐spectrum communications Doppler spread DSSS packet improved bit‐interleaved coded modulation interleaved codes iterative decoding iterative decoding algorithm iterative receiver linear prediction local reference signal magnitude loss modulation coding motion acceleration novel transceiver design performance gain performance loss mitigation phase noise phase rotation receiver relative velocity variation Research Article signal detection signal‐to‐noise ratio loss SNR loss spread spectrum communication time‐varying channels time‐varying property time‐varying underwater acoustic communications transceivers transmitter triple differential phase shift keying modulation triple differential PSK modulation underwater acoustic channel underwater acoustic communication UWA channel UWA DSSS communications wireless channels triple differential phase shift keying modulation differential phase shift keying channel coding time-varying property SNR loss adaptive selection UWA DSSS communications spread spectrum communication improved bit-interleaved coded modulation D3PSK demodulator iterative receiver motion acceleration direct-sequence spread-spectrum communications novel transceiver design transceivers time-varying channels wireless channels local reference signal interleaved codes phase noise transmitter Doppler spread iterative decoding algorithm modulation coding signal detection receiver underwater acoustic channel demodulation signal-to-noise ratio loss phase rotation performance gain underwater acoustic communication magnitude loss triple differential PSK modulation correlation loss recovery iterative decoding UWA channel DSSS packet convolutional decoder relative velocity variation D3PSK modulation channel variation convolutional codes performance loss mitigation time-varying underwater acoustic communications linear prediction
ISSN:	1751-8628, 1751-8636
Online Access:	Get full text
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Summary:	Due to the time-varying property 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$3PSK) modulation is adopted to overcome the phase rotation, whereas the phase noise will be amplified resulting in the signal-to-noise ratio (SNR) loss. At the receiver, the improved bit-interleaved coded modulation with iterative decoding algorithm for D$^3$3PSK is used to recover the SNR loss, in which the D$^3$3PSK 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.
ISSN:	1751-8628 1751-8636
DOI:	10.1049/iet-com.2020.0513