International Journal of Information and Communication Technology Research

International Journal of Information and Communication Technology Research>> Call for Papers(CFP)>>Volume 7, Number 7, July 2017

International Journal of Information and Communication Technology Research


Performance of Cooperative Diversity for PCP OFDM Based Cognitive Relay Network

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Author(s) Rna Ghallab , Mona shokair
On Pages 588-594
Volume No. 2
Issue No. 7
Issue Date July, 2012
Publishing Date July, 2012
Keywords Cyclic prefix, OFDM, Cooperative Diversity, relay, Diversity protocols, Combining methods, fading, path loss.



Abstract

In this paper, an adaptive Orthogonal Frequency Division Multiplexing (OFDM) system, with a precoded cyclic prefix (PCP), will be proposed to address the recent need of robust and flexible transmission technique in Cognitive Radio (CR) communications which is not clarified until now. Identification of PCP-OFDM signals is therefore of great importance for the design of fair spectrum sharing mechanism, particularly at very low signal-to-noise ratio (SNR) when synchronization is not achievable. The precoded cyclic prefix, multiplexed with the data-carrying OFDM signals, provides one unique and recognizable feature of PCP-OFDM signals. In this paper, the network consists of sender, a destination and a third station, which is used as a relay is analyzed. The data that is sent to the sender is considered to be OFDM with PCP. The analysis of this system will be made which is not clarified until now. The channels are modeled containing noise, Rayleigh fading and path loss. Moreover, different combining methods and diversity protocols are compared. To combine the incoming signals the channel quality should be estimated as well as possible. Amplify and Forward (AAF) will be applied in this system. Also, the effect of the positions of the relay will be studied.

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2012 IRPN Publishers