The authors present a reconfigurable soft-input soft-output (SISO) turbo decoder based on Max-Log maximum a posteriori (ML-MAP) algorithm implemented with a sliding window (SW) method. The turbo decoder is designed to support constraint lengths from 3 to 5 and synthesized to a 0.18μm standard CMOS cell library. Power and area overheads for the reconfiguration are analyzed and compared with non-reconfigurable ASIC based turbo decoder for each constraint length. Our simulation results demonstrate that the reconfigurable architecture can be applied flexibly to various wireless communication systems without large power and area overheads.
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