Hybrid Forwarding for General Cooperative Wireless Relaying in m-Nakagami Fading Channel

In this paper, an adaptive forwarding strategy for wireless networks using multiple relays in general cooperative link is analyzed. Two schemes, amplify-and-forward (AF) and decodeand-forward (DF) are investigated depending on channel conditions. Further a hybrid scheme employing multiple relays which allows switching between the two schemes according to channel condition is proposed. The bit error probability performance (BEP) for the proposed hybrid strategy has been evaluated in presence of m-nakagami fading. The simulation results are general as they hold for an arbitrary number of cooperating branches and arbitrary number of cooperating hops per branch. We have evaluated the BER performance for variable number of relays in multi-hop and multi-branch cooperative network. The impact of switching threshold and ‘m’ parameter on bit error rate (BER) is indicated. Further BEP performance is assessed using LDPC code. KeywordsLow Density Parity check (LDPC) code, Amplify and forward (AD), decode and forward (DF), adaptive decode and forward (ADF), BER, Loglikelihood ratio (LLR).