Paper Info
Title
Novel subcarrier-pair based opportunistic DF protocol for cooperative downlink OFDMA
Abstract
A novel subcarrier-pair based opportunistic DF protocol is proposed for cooperative downlink OFDMA transmission aided by a decode-and-forward (DF) relay. Specifically, user message bits are transmitted in two consecutive equal-duration time slots. A subcarrier in the first slot can be paired with a subcarrier in the second slot for the DF relay-aided transmission to a user. In particular, the source and the relay can transmit simultaneously to implement beamforming at the subcarrier in the second slot for the relay-aided transmission. Each unpaired subcarrier in either the first or second slot is used by the source for direct transmission to a user without the relay's assistance. The sum rate maximized resource allocation (RA) problem is addressed for this protocol under a total power constraint. It is shown that the novel protocol leads to a maximum sum rate greater than or equal to that for a benchmark one, which does not allow the source to implement beamforming at the subcarrier in the second slot for the relay-aided transmission. Then, a polynomial-complexity RA algorithm is developed to find an (at least approximately) optimum resource allocation (i.e., source/relay power, subcarrier pairing and assignment to users) for either the proposed or benchmark protocol. Numerical experiments illustrate that the novel protocol can lead to a greater sum rate than the benchmark one.
Year
DOI
Venue
2013
10.1109/WCNC.2013.6555089
WCNC
Keywords
DocType
Volume
downlink,resource management,ofdm,benchmark testing,protocols
Journal
abs/1301.2935
Issue
ISSN
ISBN
null
1525-3511 E-ISBN : 978-1-4673-5937-5
978-1-4673-5937-5
Citations 
PageRank 
References 
0
0.34
16
Authors
3
Name
Order
Citations
PageRank
Tao Wang1964.20
Yong Fang219131.43
Luc Vandendorpe31611160.74