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Efficient Cognitive and Cooperative Communication Scheme for Multiuser OFDMA Systems using Relays  

Kang, Min-Gyu (연세대학교 전기전자공학과)
Sang, Young-Jin (연세대학교 전기전자공학과)
Ko, Byung-Hoon (연세대학교 전기전자공학과)
Kim, Kwang-Soon (연세대학교 전기전자공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.34, no.3A, 2009 , pp. 235-243 More about this Journal
Abstract
In this paper, we investigate the cognitive and cooperative communication scheme to improve the spectral efficiency in multiuser OFDMA systems using wireless relays. First, we propose the frame structure in which the efficient frequency reuse scheme with the cognitive technique is performed to increase the system throughput. And in the case where the THP (Tomlinson-Harashima preceding) is used for the elimination of interference from the relay, we derive the effective signal to noise ratio of the link largely affected by the channel quantization error. From the system level simulation results, it is shown that the proposed cognitive and cooperative communication scheme increases the overall system performance including the feedback overhead.
Keywords
THP; OFDMA; Cognitive Radio; Relays; LDPC Code;
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