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In this paper, a novel Observe-and-Forward (OF) cooperative scheme is proposed for relay-enhanced wireless cooperative systems. In this scheme, the codewords transmitted from the source are regenerated by the decoder at the relay and forwarded without re-encoding or interleaving. The decoding processes for different streams of a transmitted codeword can be parallel, which greatly reduces the relaying latency and the complexity of the relay. Furthermore, classical Viterbi Algorithm (VA) decoding is adopted at the destination while a Turbo decoding is necessary in Decoded-and-Forward with Coded Cooperation (DF-CC) scheme. Union bounds on error performances and the achievable rates are analyzed for the OF scheme.
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