Principles of Mobile Communication
Principles of Mobile Communication
Practical quantize-and-forward schemes for the frequency division relay channel
EURASIP Journal on Wireless Communications and Networking
IEEE Transactions on Wireless Communications
Cooperative Strategies and Capacity Theorems for Relay Networks
IEEE Transactions on Information Theory
Optimal relay functionality for SNR maximization in memoryless relay networks
IEEE Journal on Selected Areas in Communications
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Error propagation in the source-relay link limits the performance of demodulation-forward (MF) relay systems. In order to solve this problem and efficiently exploit the relay, we propose log likelihood ratio (LLR)-based symbol selective transmission with a near-optimum threshold to minimize the bit error probability (BEP). In the proposed scheme, the source information is forwarded by the relay only if it is likely to be detected correctly, as determined by a comparison of the LLR with the near-optimum threshold. To derive the near-optimum threshold, the BEP of the proposed scheme is analyzed in the case of binary phase shift keying (BPSK) signals. Simulation results confirm the accuracy of the analysis and prove that the proposed scheme efficiently mitigates error propagation.