Near-capacity irregular variable length coding and irregular unity rate coding
Near-capacity irregular variable length coding and irregular unity rate coding
In this contribution we introduce an EXtrinsic Information Transfer (EXIT) chart matching technique for the design of two serially concatenated irregular codecs, each constituted by a variety of component codes. This approach facilitates a higher degree of design freedom than matching the EXIT function of an irregular codec to that of a regular codec, comprising only a single component code. As a result, a narrow EXIT chart tunnel can be created, facilitating operation at SNR values that are closer to the channel's capacity bound. This is demonstrated for a serial concatenation of iteratively decoded Irregular Variable Length Coding (IrVLC) and Irregular Unity Rate Coding (IrURC), which is favourably compared with an IrVLC and regular Unity Rate Coding (URC) based benchmarker. Finally, we show that the iterative decoding complexity of our IrVLC-IrURC scheme can be reduced by about 25% upon employing a method of jointly performing EXIT chart matching, while seeking a reduced iterative decoding complexity
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, URC, unity rate code
5500-5507
Maunder, R. G.
76099323-7d58-4732-a98f-22a662ccba6c
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
November 2009
Maunder, R. G.
76099323-7d58-4732-a98f-22a662ccba6c
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Maunder, R. G. and Hanzo, L.
(2009)
Near-capacity irregular variable length coding and irregular unity rate coding.
IEEE Transactions on Wireless Communications, 8 (11), .
(doi:10.1109/TWC.2009.070624).
Abstract
In this contribution we introduce an EXtrinsic Information Transfer (EXIT) chart matching technique for the design of two serially concatenated irregular codecs, each constituted by a variety of component codes. This approach facilitates a higher degree of design freedom than matching the EXIT function of an irregular codec to that of a regular codec, comprising only a single component code. As a result, a narrow EXIT chart tunnel can be created, facilitating operation at SNR values that are closer to the channel's capacity bound. This is demonstrated for a serial concatenation of iteratively decoded Irregular Variable Length Coding (IrVLC) and Irregular Unity Rate Coding (IrURC), which is favourably compared with an IrVLC and regular Unity Rate Coding (URC) based benchmarker. Finally, we show that the iterative decoding complexity of our IrVLC-IrURC scheme can be reduced by about 25% upon employing a method of jointly performing EXIT chart matching, while seeking a reduced iterative decoding complexity
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Published date: November 2009
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, URC, unity rate code
Organisations:
Faculty of Humanities, Southampton Wireless Group
Identifiers
Local EPrints ID: 264471
URI: http://eprints.soton.ac.uk/id/eprint/264471
PURE UUID: bc09696c-4ec3-4b01-bf0f-d3d33b24e1e5
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Date deposited: 05 Sep 2007
Last modified: 18 Mar 2024 03:09
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Author:
R. G. Maunder
Author:
L. Hanzo
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