DocumentCode :
1711422
Title :
Resource allocation in OFDMA downlink with reduced feedback overhead
Author :
Alsawah, Ayman ; Fijalkow, Inbar
Author_Institution :
CNRS, Univ Cergy-Pontoise, Cergy-Pontoise
fYear :
2008
Firstpage :
1
Lastpage :
5
Abstract :
Consider the problem of resource allocation on the downlink of a cellular OFDMA system. A fairness constraint is defined by a minimum data rate, a maximum bit-error rate and a maximum outage probability. This paper proposes a low-complexity resource allocation algorithm that requires a reduced feedback-overhead. Under a partial channel-state information, we derive the optimal subcarrier and power allocation that provides the best overall outage performance using the lowest possible number of subcarriers. Unneeded subcarriers lend themselves to interference-free use in other cells assuming some inter-cell coordination.We first evaluate the maximum achievable number of users when all subcarriers are used. This defines an upper-bound on system load. Then, for an arbitrary load ratio, we describe the corresponding resource allocation and provide an analytic upper-bound on the achievable outage probability.
Keywords :
OFDM modulation; cellular radio; computational complexity; error statistics; feedback; probability; bit-error rate; cellular OFDMA downlink; channel state information; data rate; feedback overhead; intercell coordination; optimal subcarrier allocation; orthogonal frequency division multiplexing; outage probability; power allocation; resource allocation; Base stations; Bit error rate; Downlink; Fading; Feedback; Interference; Random variables; Resource management; Shadow mapping; WiMAX;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2008. PIMRC 2008. IEEE 19th International Symposium on
Conference_Location :
Cannes
Print_ISBN :
978-1-4244-2643-0
Electronic_ISBN :
978-1-4244-2644-7
Type :
conf
DOI :
10.1109/PIMRC.2008.4699637
Filename :
4699637
Link To Document :
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