DocumentCode :
1495841
Title :
Throughput maximization over slowly fading channels using quantized and erroneous feedback
Author :
Ekbatani, Siavash ; Etemadi, Farzad ; Jafarkhani, Hamid
Author_Institution :
Electr. Eng. & Comput. Sci. Dept., Univ. of California, Irvine, CA, USA
Volume :
57
Issue :
9
fYear :
2009
fDate :
9/1/2009 12:00:00 AM
Firstpage :
2528
Lastpage :
2533
Abstract :
We design a conceptual transmission scheme that adjusts rate and power of data codewords to send them over a slowly fading channel, when quantized and possibly erroneous channel state information (CSI) is available at the transmitter. The goal is to maximize the data throughput or the expected data rate using a multi-layer superposition coding technique and temporal power control at the transmitter. The main challenge here is to design a CSI quantizer structure for a noisy feedback link. This structure resembles conventional joint source and channel coding schemes, however, with a newly introduced quasi-gray bit-mapping. Our results show that with proper CSI quantizer design, even erroneous feedback can provide performance gains. Also, with an unreliable feedback link, superposition coding provides significant gains when feedback channel is poorly conditioned and channel uncertainty at the transmitter is severe, whereas power control is more effective with more reliable feedback.
Keywords :
combined source-channel coding; fading channels; feedback; power control; telecommunication congestion control; CSI quantizer structure; channel state information; erroneous feedback; feedback channel; feedback link; joint source-channel coding schemes; multilayer superposition coding technique; quantized feedback; quasi-gray bit-mapping; slowly fading channels; superposition coding; temporal power control; throughput maximization; transmitter; Channel coding; Channel state information; Delay; Fading; Feedback; Power control; Quantization; Throughput; Transmitters; Uncertainty; Layered transmission, power control, fading channels, feedback, quantization, bit-mapping.;
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/TCOMM.2009.09.070516
Filename :
5281736
Link To Document :
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