| 摘要 |
A MAP decoder having a simple design and a decoding method thereof. The MAP decoder includes an intrinsic information storage unit to store input intrinsic information, a branch metric operation unit to calculate branch metrics of a received signal, a branch metric storage unit to store the branch metrics calculated with respect to the received signal, a forward metric operation unit to calculate forward metrics by reading out the intrinsic information and the branch metrics corresponding to the received signal from the intrinsic information storage unit and the branch metric storage unit, respectively In addition, included is a backward metric operation unit to calculate backward metrics by reading out the intrinsic information and the branch metrics corresponding to the received signal from the intrinsic information storage unit and the branch metric storage unit, respectively, and a log likelihood ratio (LLR) unit to calculate an LLR using the intrinsic information, the branch metrics and the backward metrics corresponding to the received signal. According to the MAP decoder adopting the proposed MAP algorithm, the implementation of operational elements can be simplified, and memory space can efficiently be reduced.
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