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Analysis of Effects of Nonideal Channels on the Throughput of CR Systems  

Lee, Sang-Wook (부경대학교 전자공학과)
Lim, Chang-Heon (부경대학교 전자컴퓨터정보통신공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.34, no.9A, 2009 , pp. 719-726 More about this Journal
Abstract
CR systems performs spectrum sensing operation to detect the appearance of primary users. However, since it is not feasible to do spectrum sensing and data transmission simultaneously, they typically operate alternatively in a time domain. There have been an effort(8) to investigate the optimal spectrum sensing duration for maximum throughput for the scheme with cooperative spectrum sensing. This is based on an assumption that the communication channels between each secondary user and the fusion center are ideal and does not consider the effects of transmission error. Motivated by this, we here model the channels as binary symmetric channels and examined its effect on the maximum throughput and the associated optimal sensing duration. Analysis shows that the performance degradation due to the transmission error is smaller for the case of using the AND fusion rule than for the OR fusion rule.
Keywords
cognitive radio; cooperative spectrum sensing; nonideal channel;
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