DocumentCode :
3436489
Title :
Capacity criterion-based power loading for underwater acoustic OFDM system with limited feedback
Author :
Huang, Xiaopeng
Author_Institution :
Dept. of Electr. & Comput. Eng., Stevens Inst. of Technol., Hoboken, NJ, USA
fYear :
2010
fDate :
25-27 June 2010
Firstpage :
54
Lastpage :
58
Abstract :
In the orthogonal frequency division multiplexing (OFDM) underwater acoustic (UWA) communications, some subcarriers may be subject to a deep fading. If the channel state information (CSI) is available at the transmitter, adaptive transmission techniques can be applied to mitigate deep fading effect and increase the overall system performance. Since most practical systems only obtain partial CSI at the transmitter, meanwhile, the concept of limited feedback was not been used for UWA channels and in particular not for shallow water in literature. Therefore, it´s more valuable to analyze the underwater acoustic channel with limited CSI feedback. In this paper, it is for the first time combines ambient noise and UWA channel and calculates the ambient noise power in each subcarrier, which makes it extremely challenge. We explain the properties of UWA channel and investigate the optimal power loading strategy for UWA channel with different levels of transmitter CSI,which is combined with bit loading for a given system target bit-error rate (BER). The optimum results of the problem are derived by maximum system capacity with system total transmit power and target BER constraint. The Lloyd Algorithm is employed to quantize the CSI at receiver and construct the codebook, whose copy is also known to the transmitter. Simulation results compare the performances among different bits feedback, perfect feedback and non-feedback, which show that a few bits feedback can significantly improve the system performance.
Keywords :
Acoustic noise; Bit error rate; Channel state information; Fading; Feedback; OFDM; System performance; Transmitters; Underwater acoustics; Underwater communication;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Wireless Communications, Networking and Information Security (WCNIS), 2010 IEEE International Conference on
Conference_Location :
Beijing, China
Print_ISBN :
978-1-4244-5850-9
Type :
conf
DOI :
10.1109/WCINS.2010.5541765
Filename :
5541765
Link To Document :
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