Signal-carrier cooperative DF relay using adaptive modulation

Kazuhiro Kimura, Hiroyuki Miyazaki, Tatsunori Obara, Fumiyuki Adachi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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 languageEnglish
Pages (from-to)387-395
Number of pages9
JournalIEICE Transactions on Communications
Issue number2
Publication statusPublished - 2014


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


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