In this paper, we propose a concept of parasitic communication system via relaying. The proposed system is suitable for improving the throughput of some users who are far from the base station or have numerous obstructions in their communication links. In the parasitic communication system, the users communicate to the base station by following the original setting of the standards. Only a slight modification at the retransmission mode is required. Therefore, the proposed approach is backward compatible to several existing systems.
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