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Turbo-code becomes popular for the next generation wireless communication systems because of its remarkable coding performance. One of the problems for decoding turbo-code in the receiver is the complexity and the high power consumption since multiple iterations of Soft Output Viterbi Algorithm (SOVA) or Maximum a posteriori (MAP) decoding have to be carried out to decode a data frame. To reduce the complexity of the turbo-code decoder, adaptive iteration based on cyclic redundancy checking (CRC) and output convergence approaches has been proposed to reduce the average number of iterations required for decoding a data frame. This results in a system that has variable workload since the amount of computation required for decoding each data frame is different. In this work, we propose a dynamic voltage scaling approach to further reduce the power consumption. Different from other variable workload systems, the workload here is not known at the time when the data is being decoded. Thus, optimum voltage assignment is not feasible. We propose several heuristic algorithms to assign supply voltage for different decoding iterations. Simulation results show that significant reduction of power consumption is achieved comparing with the system using fixed supply voltage.