The throughput of turbo decoder is limited by the recursion architecture. In this paper, an improved radix-4 recursion architecture is presented. In order to decrease the critical path delay, a hybrid 4-inputs addition/subtraction structure is employed. Moreover, we present a modified trace-back architecture to decrease the hardware complexity of the log-likelihood ratios (LLR) architecture. The area of the proposed MAP decoder is 0.58 mm~2 on UMC 0.13μm standard cell technology and under the worst case a maximum throughput of 600 Mbps can be achieved.
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