Iteratively Decoded Irregular Variable Length Coding and Trellis Coded Modulation
Iteratively Decoded Irregular Variable Length Coding and Trellis Coded Modulation
In this paper we propose a novel Irregular Variable Length Coding (IrVLC) scheme for near-capacity joint source and channel coding. We employ a number of Variable Length Coding (VLC) component codebooks having different coding rates for encoding appropriately chosen fractions of the input source symbols. These fractions may be designed With the aid of EXtrinsic Information Transfer (EXIT) charts so that the EXIT curve shape of the IrVLC codec may be matched to that of a serially concatenated channel codec as closely as possible. In this way, an open EXIT chart tunnel may be created even at low SNR values that are close to the channel capacity. We detail the proposed serially concatenated and iteratively decoded IrVLC and Trellis Coded Modulation (TCM) designs that are capable of operating within 0.6 dB of the uncorrelated narrowband Rayleigh fading channel’s capacity at an effective bandwidth efficiency of 1.56 bit/s/Hz, assuming ideal Nyquist filtering. By contrast, the equivalent-rate VLC-based bench-marker schemes were found to be capable of operating at 1.1 dB from capacity, which is nearly double the discrepancy of the proposed IrVLC-TCM scheme.
variable length coding, VLC, iterative decoding, EXIT chart matching, serial concatenation, joint source and channel coding, trellis, BCJR, soft, irregular coding, free distance, computational complexity, capacity, RVLC, VLEC, reversible variable length coding, variable length error correction coding, TCM, trellis coded modulation
222-227
Maunder, R. G.
76099323-7d58-4732-a98f-22a662ccba6c
Wang, J.
53d8d8bd-3c17-406e-9acf-961cc86b9a00
Ng, S. X.
e19a63b0-0f12-4591-ab5f-554820d5f78c
Yang, L-L.
ae425648-d9a3-4b7d-8abd-b3cfea375bc7
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
17 October 2007
Maunder, R. G.
76099323-7d58-4732-a98f-22a662ccba6c
Wang, J.
53d8d8bd-3c17-406e-9acf-961cc86b9a00
Ng, S. X.
e19a63b0-0f12-4591-ab5f-554820d5f78c
Yang, L-L.
ae425648-d9a3-4b7d-8abd-b3cfea375bc7
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Maunder, R. G., Wang, J., Ng, S. X., Yang, L-L. and Hanzo, L.
(2007)
Iteratively Decoded Irregular Variable Length Coding and Trellis Coded Modulation.
IEEE Workshop on Signal Processing Systems, Shanghai, China.
17 - 19 Oct 2007.
.
(doi:10.1109/SIPS.2007.4387548).
Record type:
Conference or Workshop Item
(Paper)
Abstract
In this paper we propose a novel Irregular Variable Length Coding (IrVLC) scheme for near-capacity joint source and channel coding. We employ a number of Variable Length Coding (VLC) component codebooks having different coding rates for encoding appropriately chosen fractions of the input source symbols. These fractions may be designed With the aid of EXtrinsic Information Transfer (EXIT) charts so that the EXIT curve shape of the IrVLC codec may be matched to that of a serially concatenated channel codec as closely as possible. In this way, an open EXIT chart tunnel may be created even at low SNR values that are close to the channel capacity. We detail the proposed serially concatenated and iteratively decoded IrVLC and Trellis Coded Modulation (TCM) designs that are capable of operating within 0.6 dB of the uncorrelated narrowband Rayleigh fading channel’s capacity at an effective bandwidth efficiency of 1.56 bit/s/Hz, assuming ideal Nyquist filtering. By contrast, the equivalent-rate VLC-based bench-marker schemes were found to be capable of operating at 1.1 dB from capacity, which is nearly double the discrepancy of the proposed IrVLC-TCM scheme.
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IDIVLCTCM.pdf
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ivlc-tcm.pdf
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More information
Published date: 17 October 2007
Additional Information:
Event Dates: 17-19 October 2007
Venue - Dates:
IEEE Workshop on Signal Processing Systems, Shanghai, China, 2007-10-17 - 2007-10-19
Keywords:
variable length coding, VLC, iterative decoding, EXIT chart matching, serial concatenation, joint source and channel coding, trellis, BCJR, soft, irregular coding, free distance, computational complexity, capacity, RVLC, VLEC, reversible variable length coding, variable length error correction coding, TCM, trellis coded modulation
Organisations:
Southampton Wireless Group
Identifiers
Local EPrints ID: 263907
URI: http://eprints.soton.ac.uk/id/eprint/263907
PURE UUID: dc2789e6-79ae-43bf-9470-e17c112b0398
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Date deposited: 20 Apr 2007
Last modified: 18 Mar 2024 03:09
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