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Frequency Efficient CDD-DF-Relay schemes for MC-CDMA Systems  

Ko, Kyun-Byoung (Control and Instrumentation Engineering at Chungju National University)
Woo, Choong-Chae (Electronics, Computer and Communication Engineering at Hanseo University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.48, no.5, 2011 , pp. 1-7 More about this Journal
Abstract
In this paper, CDD(Cyclic Delay Diversity)-DF(Decode-and-Forward)-Relay scheme is proposed for MC-CDMA(Multicarrier-Code Division Multiple Access) systems over multipath Rayleigh fading channels. The advantages of general DF schemes come at the expense of the spectral efficiency since the source and all the relays must transmit on orthogonal channels. In order to mitigate this disadvantage of general DF schemes, we have applied CDD techniques to each relays so that all the relays can transmit on single channel. It means that all R-D link channels can be considered as a single channel which is widely delay spread. Namely, it causes the increasing the number of multipath so that the frequency diversity gain can be achieved in MC-CDMA systems. By simulations, we have compared proposed one with general DF scheme. Therefore, it is confirmed that the proposed one can be a possible solution to achieve cooperative diversity gain without a reduction of spectral efficiency.
Keywords
CDD; DF-Relay; MC-CDMA; multipath Rayleigh fading channels;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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