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http://dx.doi.org/10.7236/JIWIT.2012.12.6.291

Multihop Transmission in Cognitive Underlay Network Over Rayleigh Fading Channels  

Park, Sang-Young (School of Electric Engineering, University of Ulsan)
Kong, Hyung-Yun (School of Electric Engineering, University of Ulsan)
Publication Information
The Journal of the Institute of Internet, Broadcasting and Communication / v.12, no.6, 2012 , pp. 291-296 More about this Journal
Abstract
In this Paper, we propose a multi-hop transmission in cognitive underlay network. In Secondary network, We assume that a secondary source S attempts to transmit D its signal to a secondary destination via N+1 hops with help of N relays $R_1$, $R_2$, ${\ldots}$, $R_N$. At hop k between relay $R_k$ and relay $R_{k+1}$. we assume that there is a primary user $PU_k$. In this paper, we assume that these channels are Rayleigh fading channels. In underlay network, the secondary transmitter has to adapt its power so that the interference caused at the primary user is less than a maximum interference threshold. considering the hop transmission between the transmitter and the repeater, we find transmit power and signal-to-noise ratio(SNR). Between the transmitter from the receiver depending on the number of relay in the underlay network, we compared to find the transmit power and signal-to-noise ratio(SNR). Finally we find optimal number of relay and optimal threshold value.
Keywords
Cooperate Communication; Cognitive radio; Multi hop; Bit Error rate; decode-and-forward relaying;
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