DocumentCode :
1435338
Title :
A New Adaptive OFDM System with Precoded Cyclic Prefix for Dynamic Cognitive Radio Communications
Author :
Wang, Xianbin ; Li, Hao ; Lin, Hai
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Western Ontario, London, ON, Canada
Volume :
29
Issue :
2
fYear :
2011
fDate :
2/1/2011 12:00:00 AM
Firstpage :
431
Lastpage :
442
Abstract :
Recent development in cognitive radio (CR) communications brings significant technical challenges in the design of adaptive and robust transmission techniques in hostile communication environments due to the dynamic channel transitions and strong co-channel interference. A novel adaptive Orthogonal Frequency Division Multiplexing (OFDM) system with a precoded cyclic prefix (PCP) is proposed in this paper to provide a dynamic CR communication platform with fast transmitter-receiver interaction capability. Besides the basic function as a guard interval for the OFDM system, the PCP, combined from two oversampled precoded Kasami sequences, provides an efficient way of sending the system parameters without the requirement of additional signaling or feedback channels. Overall system and network efficiency is substantially improved due to the simplification of the preambles and handshaking signaling required when there is any change in the CR transmission parameters. Meanwhile, the real part of the PCP is uniquely assigned to each CR transceiver as identification label for spectrum sensing. The receiver design particularly the hybrid domain equalization and PCP induced interference cancellation for the proposed OFDM system is presented in this paper. Implementation related issues including exploitation of the PCP structure and complexity reduction are investigated. The performance of the proposed PCP-OFDM system is analyzed and verified through numerical simulations.
Keywords :
OFDM modulation; cognitive radio; cyclic codes; interference suppression; radio receivers; radio transmitters; telecommunication signalling; CR communication; OFDM system; PCP; channel transition; dynamic cognitive radio communication; feedback channel; handshaking signaling; hostile communication environments; hybrid domain equalization; interference cancellation; orthogonal frequency division multiplexing; oversampled precoded Kasami sequence; precoded cyclic prefix; spectrum sensing identification label; strong cochannel interference; transmission parameter; transmitter-receiver interaction capability; OFDM; adaptive transmission; cognitive radio; hybrid domain equalization; interference cancellation; precoded cyclic prefix;
fLanguage :
English
Journal_Title :
Selected Areas in Communications, IEEE Journal on
Publisher :
ieee
ISSN :
0733-8716
Type :
jour
DOI :
10.1109/JSAC.2011.110215
Filename :
5701696
Link To Document :
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