Location dependent optimal relay selection in mobile cooperative environment

This paper proposes an optimal relay selection criteria based on the location of the relay (0 ≤ λ ≤ 1) relative to source and destination in the cooperative coded system. The proposed optimization algorithm employs distributed turbo product coding technique with hard and soft decoding. It is shown that the link quality depends on the location of the relay which in turn affects overall system Bit Error Rate (BER) performance. The simulation model creates several scenarios for location of intermediate relays when the inter-user channel is experiencing distortion in presence of different Signal to Noise Ratio (SNR)s. It is observed that the link performance degrades as the relay proximity changes with respect to the source and the destination. The relay selection optimization algorithm provides the participating nodes necessary information to select neighboring nodes depending on link quality, thus lowering the BER and increasing the overall network capacity.