Technical Program

Paper Detail

Paper:	SPCOM-L3.2
Session:	Co-operative Communications
Time:	Wednesday, May 17, 10:20 - 10:40
Presentation:	Lecture
Topic:	Signal Processing for Communication: Distributed and collaborative signal processing
Title:	An Adaptive Protocol for Cooperative Communications Achieving Asymptotic Minimum Symbol-Error-Rate
Authors:	Chaiyod Pirak, University of Maryland, College Park, United States / King Mongkut's Institute of Technology North Bangkok, Thailand; Z. Jane Wang, University of British Columbia, Canada; K. J. Ray Liu, University of Maryland, College Park, United States
Abstract:	This paper investigates the protocol design issue for cooperation systems in wireless communications. A tight approximate symbol error rate (SER) for such systems is derived and analyzed. Based on such analysis, an optimum power allocation scheme is proposed by optimizing the derived approximate SER subject to fixed transmission rate and total transmit power constraints. Then, a novel adaptive protocol is proposed for cooperative communications based on minimizing the asymptotic SER (i.e. in an averaging sense under high-enough SNR regimes) of such systems. This proposed adaptive protocol is able to achieve the maximum achievable diversity gain available in such systems without sacrificing any transmission rate or the total transmit power, and optimally adapts the number of cooperation partners under the changing environments. Simulation results show that the proposed adaptive protocol provides a lower SER compared with existing protocols. In addition, the proposed adaptive protocol with optimum power allocation can remarkably enhance the SER performance in comparison with the equal power allocation scheme.