DocumentCode :
748884
Title :
A Probabilistic Channel Quantization Scheme Based on Max-SNR Resource Allocation in Multiuser OFDM Systems
Author :
Xu, Wenjun ; Niu, Kai ; He, Zheqiang
Author_Institution :
Sch. of Inf. Eng., Beijing Univ. of Posts & Telecommun., Beijing
Volume :
12
Issue :
6
fYear :
2008
fDate :
6/1/2008 12:00:00 AM
Firstpage :
435
Lastpage :
437
Abstract :
This letter discusses channel quantization problem in multiuser orthogonal frequency division multiplexing (OFDM) systems based on maximum subchannel signal-to-noise ratio (Max-SNR) resource allocation (RA). It is assumed that subcarriers are assigned to users according to Max-SNR RA. Then, a probabilistic quantization scheme is derived to obtain the higher rate-sum capacity via equal power approximation for water-filling. Simulation results show the proposed scheme achieves a great performance gain compared to equal distance quantization in both high-SNR and low-SNR cases. However, if 5% capacity loss is allowed, two additional feedback bits are required for the low-SNR instance due to the larger approximation error.
Keywords :
OFDM modulation; probability; quantisation (signal); resource allocation; multiuser OFDM systems; orthogonal frequency division multiplexing; power approximation; probabilistic channel quantization; resource allocation; subchannel signal-to-noise ratio; Character generation; Fading; Feedback; Helium; OFDM; Performance gain; Quantization; Resource management; Signal to noise ratio; Transmitters;
fLanguage :
English
Journal_Title :
Communications Letters, IEEE
Publisher :
ieee
ISSN :
1089-7798
Type :
jour
DOI :
10.1109/LCOMM.2008.072091
Filename :
4542774
Link To Document :
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