Iterative Delay-Scale Spread Channel Estimation and Variational Soft Symbol Decoding

Halder, N and Arunkumar, KP and Murthy, CR (2023) Iterative Delay-Scale Spread Channel Estimation and Variational Soft Symbol Decoding. In: 24th IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2023, 25- 28 September 2023, Shanghai, pp. 261-265.

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Abstract

In delay-scale spread channels, modulation schemes like orthogonal frequency division multiplexing, orthogonal time frequency space, and the recently proposed orthogonal delay-scale space modulation schemes need to use computationally expensive MMSE receivers to obtain reasonable performance. The MMSE receiver is required to equalize the severe inter-carrier interference caused by the Doppler scale in harsh wideband channels. In this paper, we first develop a variational Bayesian inference (VBI) based a low-complexity variational soft symbol decoding (VSSD) algorithm under the availability of perfect channel state information at the receiver and present a comparative study of the improvement in the BER obtained by using the VSSD algorithm with these waveforms. Second, we propose a two-stage iterative algorithm for the delay-scale spread wideband channel estimation and data detection and show its performance advantage over a direct channel estimation followed by data detection, in the context of underwater acoustic communications. We also present a comparative study of the performance of orthogonal matching pursuit and VBI based channel estimations. © 2023 IEEE.

Item Type:	Conference Paper
Publication:	IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Bayesian networks; Channel estimation; Channel state information; Inference engines; Iterative decoding; Underwater acoustic communication; Underwater acoustics, MMSE receivers; Modulation schemes; OTFS; Performance; Postamble; Preamble; Soft symbol decoding; Sparse vector recovery; Sparse vectors; UWA communication, Orthogonal frequency division multiplexing
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	01 Mar 2024 05:30
Last Modified:	01 Mar 2024 05:30
URI:	https://eprints.iisc.ac.in/id/eprint/83784

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