Low-Complexity Viterbi Equalizer for MBOK DS-UWB Systems

Kenichi TAKIZAWA; Ryuji KOHNO

doi:10.1093/ietfec/e88-a.9.2350

Low-Complexity Viterbi Equalizer for MBOK DS-UWB Systems

Kenichi TAKIZAWA, Ryuji KOHNO

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This paper presents a low-complexity equalization for M-ary biorthogonal keying based direct sequence ultra wideband (MBOK DS-UWB) systems. We focus on a Viterbi equalizer, which is based on maximum likelihood sequence estimation (MLSE). To reduce the computational complexity of MLSE-based equalizer, we use two strategies. One is the use of delayed-decision feedback sequence estimation (DDFSE), which is a hybrid estimation between MLSE and decision feedback estimation (DFE). And the other is the truncation of state transition in MLSE by considering MBOK pulse mapping. The reduced complexity sequence estimation is named as reduced state (RS)-DDFSE. By the use of RS-DDFSE, the complexity of Viterbi equalizer for MBOK DS-UWB is significantly reduced, by comparison with that of MLSE. The performance of RS-DDFSE based equalizer is evaluated on multipath fading channel models provided by IEEE802.15.3a. An analysis on trellis diagram of RS-DDFSE and simulation results show that the impact on error rate performance generated by the complexity lower is slight.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E88-A No.9 pp.2350-2355

Publication Date: 2005/09/01

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DOI: 10.1093/ietfec/e88-a.9.2350

Type of Manuscript: Special Section PAPER (Special Section on Ultra Wideband Systems)

Category: Coding

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Kenichi TAKIZAWA, Ryuji KOHNO, "Low-Complexity Viterbi Equalizer for MBOK DS-UWB Systems" in IEICE TRANSACTIONS on Fundamentals, vol. E88-A, no. 9, pp. 2350-2355, September 2005, doi: 10.1093/ietfec/e88-a.9.2350.
Abstract: This paper presents a low-complexity equalization for M-ary biorthogonal keying based direct sequence ultra wideband (MBOK DS-UWB) systems. We focus on a Viterbi equalizer, which is based on maximum likelihood sequence estimation (MLSE). To reduce the computational complexity of MLSE-based equalizer, we use two strategies. One is the use of delayed-decision feedback sequence estimation (DDFSE), which is a hybrid estimation between MLSE and decision feedback estimation (DFE). And the other is the truncation of state transition in MLSE by considering MBOK pulse mapping. The reduced complexity sequence estimation is named as reduced state (RS)-DDFSE. By the use of RS-DDFSE, the complexity of Viterbi equalizer for MBOK DS-UWB is significantly reduced, by comparison with that of MLSE. The performance of RS-DDFSE based equalizer is evaluated on multipath fading channel models provided by IEEE802.15.3a. An analysis on trellis diagram of RS-DDFSE and simulation results show that the impact on error rate performance generated by the complexity lower is slight.
URL: https://globals.ieice.org/en_transactions/fundamentals/10.1093/ietfec/e88-a.9.2350/_p

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@ARTICLE{e88-a_9_2350,
author={Kenichi TAKIZAWA, Ryuji KOHNO, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Low-Complexity Viterbi Equalizer for MBOK DS-UWB Systems},
year={2005},
volume={E88-A},
number={9},
pages={2350-2355},
abstract={This paper presents a low-complexity equalization for M-ary biorthogonal keying based direct sequence ultra wideband (MBOK DS-UWB) systems. We focus on a Viterbi equalizer, which is based on maximum likelihood sequence estimation (MLSE). To reduce the computational complexity of MLSE-based equalizer, we use two strategies. One is the use of delayed-decision feedback sequence estimation (DDFSE), which is a hybrid estimation between MLSE and decision feedback estimation (DFE). And the other is the truncation of state transition in MLSE by considering MBOK pulse mapping. The reduced complexity sequence estimation is named as reduced state (RS)-DDFSE. By the use of RS-DDFSE, the complexity of Viterbi equalizer for MBOK DS-UWB is significantly reduced, by comparison with that of MLSE. The performance of RS-DDFSE based equalizer is evaluated on multipath fading channel models provided by IEEE802.15.3a. An analysis on trellis diagram of RS-DDFSE and simulation results show that the impact on error rate performance generated by the complexity lower is slight.},
keywords={},
doi={10.1093/ietfec/e88-a.9.2350},
ISSN={},
month={September},}

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TY - JOUR
TI - Low-Complexity Viterbi Equalizer for MBOK DS-UWB Systems
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 2350
EP - 2355
AU - Kenichi TAKIZAWA
AU - Ryuji KOHNO
PY - 2005
DO - 10.1093/ietfec/e88-a.9.2350
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E88-A
IS - 9
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - September 2005
AB - This paper presents a low-complexity equalization for M-ary biorthogonal keying based direct sequence ultra wideband (MBOK DS-UWB) systems. We focus on a Viterbi equalizer, which is based on maximum likelihood sequence estimation (MLSE). To reduce the computational complexity of MLSE-based equalizer, we use two strategies. One is the use of delayed-decision feedback sequence estimation (DDFSE), which is a hybrid estimation between MLSE and decision feedback estimation (DFE). And the other is the truncation of state transition in MLSE by considering MBOK pulse mapping. The reduced complexity sequence estimation is named as reduced state (RS)-DDFSE. By the use of RS-DDFSE, the complexity of Viterbi equalizer for MBOK DS-UWB is significantly reduced, by comparison with that of MLSE. The performance of RS-DDFSE based equalizer is evaluated on multipath fading channel models provided by IEEE802.15.3a. An analysis on trellis diagram of RS-DDFSE and simulation results show that the impact on error rate performance generated by the complexity lower is slight.
ER -