Efficient OFDM Mobile Radio Packet System Employing LLR Combining Multiuser Detection for ARQ with Adaptive Modulation and Coding Scheme

Riichiro NAGAREDA; Kazuhiko FUKAWA; Hiroshi SUZUKI

doi:10.1093/ietcom/e90-b.6.1444

Efficient OFDM Mobile Radio Packet System Employing LLR Combining Multiuser Detection for ARQ with Adaptive Modulation and Coding Scheme

Riichiro NAGAREDA, Kazuhiko FUKAWA, Hiroshi SUZUKI

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This paper proposes an OFDM mobile radio packet system that employs a new protocol of automatic repeat request (ARQ) for nonlinear multiuser detection (MUD) with log likelihood ratio combining (LC) on the appropriate bits. The conventional metric combining (MC) MUD separates collided packets by using nonlinear MUD, accumulates the Euclidian distance metrics of the received subcarrier symbols in the packets, and then achieves throughput improvement. However, when MC-MUD detects a packet error, it makes user terminals retransmit the same packets so as to reproduce the collision of the same packets. The proposed LC-MUD scheme simplifies the ARQ protocol and requires no reproduction of the same packet collision. The computer simulations demonstrate the superior throughput of LC-MUD to that of MC-MUD, and further improvement due to adaptive modulation and coding (AMC) optimized for the nonlinear MUD in LC-MUD.

Publication: IEICE TRANSACTIONS on Communications Vol.E90-B No.6 pp.1444-1453

Publication Date: 2007/06/01

Publicized

Online ISSN: 1745-1345

DOI: 10.1093/ietcom/e90-b.6.1444

Type of Manuscript: PAPER

Category: Wireless Communication Technologies

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Riichiro NAGAREDA, Kazuhiko FUKAWA, Hiroshi SUZUKI, "Efficient OFDM Mobile Radio Packet System Employing LLR Combining Multiuser Detection for ARQ with Adaptive Modulation and Coding Scheme" in IEICE TRANSACTIONS on Communications, vol. E90-B, no. 6, pp. 1444-1453, June 2007, doi: 10.1093/ietcom/e90-b.6.1444.
Abstract: This paper proposes an OFDM mobile radio packet system that employs a new protocol of automatic repeat request (ARQ) for nonlinear multiuser detection (MUD) with log likelihood ratio combining (LC) on the appropriate bits. The conventional metric combining (MC) MUD separates collided packets by using nonlinear MUD, accumulates the Euclidian distance metrics of the received subcarrier symbols in the packets, and then achieves throughput improvement. However, when MC-MUD detects a packet error, it makes user terminals retransmit the same packets so as to reproduce the collision of the same packets. The proposed LC-MUD scheme simplifies the ARQ protocol and requires no reproduction of the same packet collision. The computer simulations demonstrate the superior throughput of LC-MUD to that of MC-MUD, and further improvement due to adaptive modulation and coding (AMC) optimized for the nonlinear MUD in LC-MUD.
URL: https://globals.ieice.org/en_transactions/communications/10.1093/ietcom/e90-b.6.1444/_p

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@ARTICLE{e90-b_6_1444,
author={Riichiro NAGAREDA, Kazuhiko FUKAWA, Hiroshi SUZUKI, },
journal={IEICE TRANSACTIONS on Communications},
title={Efficient OFDM Mobile Radio Packet System Employing LLR Combining Multiuser Detection for ARQ with Adaptive Modulation and Coding Scheme},
year={2007},
volume={E90-B},
number={6},
pages={1444-1453},
abstract={This paper proposes an OFDM mobile radio packet system that employs a new protocol of automatic repeat request (ARQ) for nonlinear multiuser detection (MUD) with log likelihood ratio combining (LC) on the appropriate bits. The conventional metric combining (MC) MUD separates collided packets by using nonlinear MUD, accumulates the Euclidian distance metrics of the received subcarrier symbols in the packets, and then achieves throughput improvement. However, when MC-MUD detects a packet error, it makes user terminals retransmit the same packets so as to reproduce the collision of the same packets. The proposed LC-MUD scheme simplifies the ARQ protocol and requires no reproduction of the same packet collision. The computer simulations demonstrate the superior throughput of LC-MUD to that of MC-MUD, and further improvement due to adaptive modulation and coding (AMC) optimized for the nonlinear MUD in LC-MUD.},
keywords={},
doi={10.1093/ietcom/e90-b.6.1444},
ISSN={1745-1345},
month={June},}

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TY - JOUR
TI - Efficient OFDM Mobile Radio Packet System Employing LLR Combining Multiuser Detection for ARQ with Adaptive Modulation and Coding Scheme
T2 - IEICE TRANSACTIONS on Communications
SP - 1444
EP - 1453
AU - Riichiro NAGAREDA
AU - Kazuhiko FUKAWA
AU - Hiroshi SUZUKI
PY - 2007
DO - 10.1093/ietcom/e90-b.6.1444
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E90-B
IS - 6
JA - IEICE TRANSACTIONS on Communications
Y1 - June 2007
AB - This paper proposes an OFDM mobile radio packet system that employs a new protocol of automatic repeat request (ARQ) for nonlinear multiuser detection (MUD) with log likelihood ratio combining (LC) on the appropriate bits. The conventional metric combining (MC) MUD separates collided packets by using nonlinear MUD, accumulates the Euclidian distance metrics of the received subcarrier symbols in the packets, and then achieves throughput improvement. However, when MC-MUD detects a packet error, it makes user terminals retransmit the same packets so as to reproduce the collision of the same packets. The proposed LC-MUD scheme simplifies the ARQ protocol and requires no reproduction of the same packet collision. The computer simulations demonstrate the superior throughput of LC-MUD to that of MC-MUD, and further improvement due to adaptive modulation and coding (AMC) optimized for the nonlinear MUD in LC-MUD.
ER -