Scaled Selection Combining Based Cooperative Diversity System With Decode and Forward Relaying
Abstract
Consider a cooperative diversity network that consists of a source, cooperating relays, and a destination. The relays cooperate with the source through the decode and forward protocol to transmit a data symbol from the source to the destination. In a conventional signal-to-noise ratio based selection combining scheme at the destination, the effect of the source-to-relay links is not accounted for when choosing one link from the set consisting of the source-to-destination and relay-to-destination links. To overcome this drawback, we modify the conventional scheme by including, in the selection process, a deterministic scale factor that incorporates the effect of the source-to-relay links. For statistically independent links that undergo flat Rayleigh fading, we derive, in closed form, the exact end-to-end symbol error probability (SEP) of this modified scheme, which we call a scaled selection combining scheme for M-ary phase-shift keying constellation. We also give a method of obtaining the optimum scale factor that minimizes the end-to-end SEP. A system designer should select the optimum scale factor to achieve the best performance of the scheme.
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Keywords
DECODERS, FORWARD RELAY, RAYLEIGH FADING, ERROR ANALYSIS
Citation
Selvaraj, M. D., & Mallik, R. K. (2010). Scaled Selection Combining Based Cooperative Diversity System with Decode and Forward Relaying. IEEE Transactions on Vehicular Technology, 59 (9): 4388-4399. doi: 10.1109/TVT.2010.2065819