Cooperative transmission, in which a source and relay cooperate to send a message to a destination, can provide spatial diversity against fading in wireless networks. We derive analytical expressions for the error probability of amplify-and-forward (AF), decode-and-forward (DF), and a new hybrid AF/DF relaying protocol, for systems using strong forward error correction in quasi-static Rayleigh fading channels, and these expressions are shown to compare favorably with simulation results using turbo codes. Analytical results include an exact expression for the distribution of the SNR in AF transmission. For the protocols that achieve diversity (AF, adaptive DF, and hybrid AF/DF), the optimum position of the relay is midway between the source and destination, implying that mutual relaying (or partnering) to a common destination is suboptimal.
Conference Dates: May 1, 2006
Conference Location: Toulouse, FR
Conference Title: IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)
Pub Type: Conferences
amplify-and-forward, cooperative diversity, decode-and-forward, relay, spatial diversity, turbo code