Phase Forward Cooperative Communications with Antenna Selection and Continuous Phase Modulation

In this paper we proposed two extensions to the recently proposed Phase Forward (PF) relaying strategy for cooperative communication. One extension is the replacement of CPFSK modulation by the more practical Gaussian filtered minimum shift keying (GMSK) modulation scheme. The second extension is the incorporation of antenna selection at the relay. Semi-analytical expressions for the bit error probabilities (BEP) of the two extension systems are derived in the paper. It is found that PF-GMSK can attain similar BEP performance as PF-CPFSK, despite the fact that it is a more bandwidth efficient modulation. Furthermore, it is better than GMSK with decode-and-forward (DF). It is also found that PF, with antenna selection at the relay, can actually outperform amplify-and-forward (AF) without antenna selection in a time-selective fading environment. It also leads to a lower outage probability when compared to time-diversity in an operating environment with shadowing.