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The deployment of relay nodes is a viable solution to fulfill the demands of high throughput and ubiquitous access for future mobile radio communications. A relay can cooperate by transmitting either a repetition of the previously transmitted signal (repetition coding) or by sending new code bits which have not been transmitted before (incremental redundancy). In this paper, a general optimization method for the achievable code rates in an adaptive relay network with repetition coding and incremental redundancy is presented.
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