Performance Analysis of Dual-Hop Mixed Relaying Networks with N Best-Path Selection over Rayleigh Fading Channel

Cooperative relaying is one of the promising technology which is used to improve coverage and spatial diversity. A new relay strategy, the N Best-Relay Selection scheme is proposed to improve the bandwidth penalty and to increase the spatial diversity by using a sub-optimal allocation for the relay relative distance between the source and destination in a multi-hop cooperative systems. A single branch dual-hop network and dual branch dual-hop network with adaptive Decode -andforward (DF) and Amplify-and-forward (AF) cooperative diversity systems is considered. The proposed N Best-Relay selection scheme over single branch dual-hop system is compared with dual branch dual-hop network using the closed-form expression. The BER (Bit error rate) and Outage probability using binary and quadrature phase shift keying modulation schemes (BPSK & QPSK) with adaptive mixed decode-and-forward (DF) and amplify-and-forward (AF) cooperative diversity systems over Rayleigh fading channel were estimated. Results show that in the th best relay the diversity order is equal to (M −N +2) where M is the number of relays. IndexTerms—Relay, NBest-Relay Selection scheme, single branch dual-hop network, dual branch dual-hop network, AF scheme, DF scheme