Adaptive power allocation in cooperative OFDM transmission with three-hop DF relaying

Adaptive power allocation subject to the total power constraint in an end-to-end cooperative orthogonal frequency Division multiplexing (OFDM) system is studied, with the optimal power allocation in terms of maximizing the sum transmission Rate being derived. The conventional two-hop system model is...

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Bibliographic Details
Published in:2013 IET International Conference on Information and Communications Technologies : April 27-29, 2013, Beijing, China pp. 387 - 393
Main Authors: Wang, Jun, Chai, Xiaomeng, Zhang, Xu, Zhang, Zhongshan, Long, Keping
Format: Conference Proceeding
Language:English
Published: Stevenage, UK IET 2013
The Institution of Engineering & Technology
Subjects:
Modulation and coding methods
Radio links and equipment
deep fading
first-hop relay-to-destination links
wireless coverage
adaptive power allocation
cooperative communication
decode and forward communication
sum transmission rate
independent and identically distributed subchannels
end-to-end cooperative orthogonal frequency division multiplexing system
decode-and-forward relay
fading channels
sub-channel numbers
two-hop system model
relay selection
source-to-destination links
total power constraint
OFDM modulation
cooperative OFDM transmission
three-hop DF relaying
relay networks (telecommunication)
ISBN:1849196532, 9781849196536
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Summary:Adaptive power allocation subject to the total power constraint in an end-to-end cooperative orthogonal frequency Division multiplexing (OFDM) system is studied, with the optimal power allocation in terms of maximizing the sum transmission Rate being derived. The conventional two-hop system model is extended to a three-hop structure in this paper to improve the Wireless coverage. Independent and identically distributed (i.i.d.) sub-channels are assumed in each Decode-and-Forward (DF) relay without considering the effect of inter-relay interference. Relay selection is also performed in the proposed cooperative transmission, and each relay itself decides whether to forward data for the source depending on the quality of the sub-channels. The transmission bottleneck in the conventional two-hop cooperative system can be overcome effectively, especially when the source-to-destination and first-hop relay-to-destination links are both in a deep fading. The proposed theoretical analysis is validated by using simulation, and it's shown that the sum rate of the proposed algorithm is the monotonically increasing function of both the sub-channel numbers and total system power. Numerical results also prove the superiority of the proposed three-hop model over the conventional two-hop system in terms of end-to-end sum data rate.
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SourceType-Conference Papers & Proceedings-1
content type line 22
ISBN:1849196532
9781849196536
DOI:10.1049/cp.2013.0074