DocumentCode
76068
Title
On the Concavity of the Sum-Rate Function in OFDM Systems
Author
Jeonghee Chi ; Jieun Kim ; Youjung Ha ; Hyang-Won Lee
Author_Institution
Dept. of Internet & Multimedia Eng., Konkuk Univ., Seoul, South Korea
Volume
18
Issue
9
fYear
2014
fDate
Sept. 2014
Firstpage
1499
Lastpage
1502
Abstract
We study the power allocation problem for maximizing the sum rate in orthogonal frequency-division multiplexing systems, where multiple point-to-point links share a set of subcarriers. This problem is hard to solve, in general, due to its nonconvexity. In this letter, we characterize the conditions for the problem to be convex, in which case the problem can be solved efficiently using known algorithms such as gradient projection method. We validate our analysis through simulations.
Keywords
OFDM modulation; concave programming; gradient methods; radio links; OFDM systems; gradient projection method; multiple point-to-point links; nonconvexity; orthogonal frequency-division multiplexing systems; power allocation problem; subcarrier sets; sum-rate function concavity; Frequency division multiaccess; Interference channels; Linear programming; OFDM; Receivers; Transmitters; OFDM; concavity conditions; non-convex optimization; sum-rate function;
fLanguage
English
Journal_Title
Communications Letters, IEEE
Publisher
ieee
ISSN
1089-7798
Type
jour
DOI
10.1109/LCOMM.2014.2334323
Filename
6847120
Link To Document