| 摘要 |
The shared channel decoder (SCD) includes a branch metric calculator for calculating branch metrics Bv, a plurality of ACS units (3) for computing and exchanging new path metrics T, and survivor paths Ev, a memory (RAM) for storing new path metrics GAMMA t, and survivor paths Ev, and a memory (RAM) for storing previous path metrics GAMMA t-1 and survivor paths Et-1. The branch metrics Bt is the set of branch metrics of decoding step t (e.g., for a code rate of 1/2, Bt = Bt,00, Bt,01, Bt,10, Bt,11), the path metrics GAMMA t is the set of S survivor metrics at decoding step t and the survivor paths Et is the set of S survivor metrics where S is the number of decoder states. The shared channel decoder includes a branch metric (2) for storing branch metrics Bt, a tentative path metric memory for storing tentative path metrics GAMMA (c+1)D, and a multiplexer (8) for selecting the previous path metrics GAMMA t-1 when t=T+cD, and selecting the tentative path metrics GAMMA (c+1)D when t=T+cD.
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