Signal-carrier cooperative DF relay using adaptive modulation

Kazuhiro Kimura; Hiroyuki Miyazaki; Tatsunori Obara; Fumiyuki Adachi

doi:10.1587/transcom.E97.B.387

Signal-carrier cooperative DF relay using adaptive modulation

Kazuhiro Kimura, Hiroyuki Miyazaki, Tatsunori Obara, Fumiyuki Adachi

Research Organization of Electrical Communication (ROEC)

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

2-time slot cooperative relay can be used to increase the cell-edge throughput. Adaptive data modulation further improves the throughput. In this paper, we introduce adaptive modulation to singlecarrier (SC) cooperative decode-and-forward (DF) relay. The best modulation combination for mobile-terminal (MT)-relay station (RS) and RS-base station (BS) links is determined for the given local average signal-to-noise power ratios (SNRs) of MT-BS, MT-RS and RS-BS links. According to the modulation combination, the ratio of time slot length of the MT-RS link (first time slot) and the RS-BS link (second time slot) is changed. It is shown by computer simulation that the use of adaptive modulation can achieve higher throughput than fixed modulation and reduces by about 9 dB the required normalized total transmit SNR for a 10%-outage throughput of 0.8 bps/Hz compared to direct transmission.

Original language	English
Pages (from-to)	387-395
Number of pages	9
Journal	IEICE Transactions on Communications
Volume	E97-B
Issue number	2
DOIs	https://doi.org/10.1587/transcom.E97.B.387
Publication status	Published - 2014 Jan 1

Keywords

Adaptive modulation
Cooperative decode-and-forward (DF) relay
Single-carrier transmission

ASJC Scopus subject areas

Software
Computer Networks and Communications
Electrical and Electronic Engineering

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title = "Signal-carrier cooperative DF relay using adaptive modulation",

abstract = "2-time slot cooperative relay can be used to increase the cell-edge throughput. Adaptive data modulation further improves the throughput. In this paper, we introduce adaptive modulation to singlecarrier (SC) cooperative decode-and-forward (DF) relay. The best modulation combination for mobile-terminal (MT)-relay station (RS) and RS-base station (BS) links is determined for the given local average signal-to-noise power ratios (SNRs) of MT-BS, MT-RS and RS-BS links. According to the modulation combination, the ratio of time slot length of the MT-RS link (first time slot) and the RS-BS link (second time slot) is changed. It is shown by computer simulation that the use of adaptive modulation can achieve higher throughput than fixed modulation and reduces by about 9 dB the required normalized total transmit SNR for a 10%-outage throughput of 0.8 bps/Hz compared to direct transmission.",

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AU - Kimura, Kazuhiro

AU - Miyazaki, Hiroyuki

AU - Obara, Tatsunori

AU - Adachi, Fumiyuki

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N2 - 2-time slot cooperative relay can be used to increase the cell-edge throughput. Adaptive data modulation further improves the throughput. In this paper, we introduce adaptive modulation to singlecarrier (SC) cooperative decode-and-forward (DF) relay. The best modulation combination for mobile-terminal (MT)-relay station (RS) and RS-base station (BS) links is determined for the given local average signal-to-noise power ratios (SNRs) of MT-BS, MT-RS and RS-BS links. According to the modulation combination, the ratio of time slot length of the MT-RS link (first time slot) and the RS-BS link (second time slot) is changed. It is shown by computer simulation that the use of adaptive modulation can achieve higher throughput than fixed modulation and reduces by about 9 dB the required normalized total transmit SNR for a 10%-outage throughput of 0.8 bps/Hz compared to direct transmission.

AB - 2-time slot cooperative relay can be used to increase the cell-edge throughput. Adaptive data modulation further improves the throughput. In this paper, we introduce adaptive modulation to singlecarrier (SC) cooperative decode-and-forward (DF) relay. The best modulation combination for mobile-terminal (MT)-relay station (RS) and RS-base station (BS) links is determined for the given local average signal-to-noise power ratios (SNRs) of MT-BS, MT-RS and RS-BS links. According to the modulation combination, the ratio of time slot length of the MT-RS link (first time slot) and the RS-BS link (second time slot) is changed. It is shown by computer simulation that the use of adaptive modulation can achieve higher throughput than fixed modulation and reduces by about 9 dB the required normalized total transmit SNR for a 10%-outage throughput of 0.8 bps/Hz compared to direct transmission.

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