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 |
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Pages (from-to) | 387-395 |
Number of pages | 9 |
Journal | IEICE Transactions on Communications |
Volume | E97-B |
Issue number | 2 |
DOIs | |
Publication status | Published - 2014 |
Externally published | Yes |
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