Paper Info
Title
On Power Allocation for Dual-Hop Amplify-and-Forward OFDM Relay Systems
Abstract
The solutions to an optimal power allocation problem in dual-hop amplify-and-forward (non-regenerative) OFDM relay systems over given channel gains are provided with a joint transmit power constraint. We analytically derive the allocated power to each hop/subcarrier that satisfies the Karush-Kuhn-Tucker (KKT) conditions by solving simultaneous equations. The solutions imply that at most 3(N) - 1 possible power allocation candidates could exist on both source and relay nodes satisfying KKT conditions when N is the number of subcarriers. Based on the solution, a sub-optimal power allocation method that selects only significant allocated power in strong subcarriers is proposed and achieves higher capacity (achievable rate) than conventional sub-optimal methods. As for the feasibility, the number of candidates to be evaluated is N in the proposed method.
Year
DOI
Venue
2008
10.1109/GLOCOM.2008.ECP.789
IEEE Global Telecommunications Conference (Globecom)
Keywords
Field
DocType
ofdm,karush kuhn tucker,simultaneous equations,karush kuhn tucker conditions,resource management,gain,signal to noise ratio,ofdm modulation,satisfiability
Subcarrier,Mathematical optimization,Transmitter power output,Computer science,Control theory,Signal-to-noise ratio,Computer network,Communication channel,Karush–Kuhn–Tucker conditions,Orthogonal frequency-division multiplexing,Relay,Simultaneous equations
Conference
ISSN
Citations 
PageRank 
1930-529X
6
0.67
References 
Authors
6
3
Name
Order
Citations
PageRank
Masato Saito1324.02
Chandranath R. N. Athaudage2837.99
Jamie Evans3959.49