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Full-Duplex Relaying based on Distributed Decoding in OFDM Systems

Retransmission of user's data at partner node in repetition based cooperative protocols decreases bandwidth efficiency and imposes overhead on cooperative signalling. In this paper we propose two full-duplex distributed cooperative protocols for OFDM systems, that improve BER performance and decrease overhead without any hardware changes in comparison with the conventional cooperative protocols. In the proposed full-duplex distributed cooperative system, the partner node retransmits a part of the information on high quality subcarriers that belong to the user's data instead of all received ones. An extensive Monte Carlo simulation study is presented to reveal the superior performance of the distributed decoding system as compared to that of the conventional cooperative schemes for the OFDM scheme.