| 摘要 |
A maximum a posteriori (MAP) detector/decoder employs an algorithm that computes log-likelihood value with an a posteriori probability (APP) value employing a number N of previous state sequences greater than or equal to two (N>=2). By defining the APP with more previous state sequences, the set of alpha values may be calculated for a current state and then reduced. After generating the reduced set of alpha values, the full set of beta values may be generated for calculation of log-likelihood values. By calculating a set of alpha values that may be decimated by, for example, N, the amount of memory required to store the alpha values used in subsequent computations is reduced.
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