Publication: Overcomplete source expansion aided, soft-bit assisted speech transceiver
Date
2015
Authors
Arifin N.F.B.T.
Othman N.S.
Ahmed A.M.
Journal Title
Journal ISSN
Volume Title
Publisher
Institute of Electrical and Electronics Engineers Inc.
Abstract
This paper presents a scheme that invokes jointly optimized source and channel decoding, which exploits the redundancy imposed by the overcomplete expansion scheme. More explicitly, a structured redundancy based on discrete Fourier transform (DFT) is inserted to the speech signal prior to source encoding. At the receiver the soft-input soft-output (SISO) decoder exploits the source index correlation for error protection. Furthermore, the explicit redundancy introduced in the speech signal is exploited to reconstruct the received voice signal with the aid of pseudo-inverse of the overcomplete block transform. The performance of the proposed scheme is evaluated when communicating over Additive White Gaussian Noise (AWGN) channel. The specific scheme using an overall code rate of 1/2 benefitted from the exploitation of the residual redundancy with about 0.4 dB Eb/N0 gain to its corresponding hard speech decoding based counterpart. � 2014 IEEE.
Description
Channel coding; Decoding; Discrete Fourier transforms; Expansion; Redundancy; Speech communication; Turbo codes; White noise; Additive white Gaussian noise channel; Channel decoding; Frame expansion; Joint source-channel coding; Overcomplete expansions; Residual redundancy; Soft decoding; Soft-input soft-output decoders; Gaussian noise (electronic)