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A NEW SOFT-OUTPUT ALGORITHM OF DECODING |
Liu Guangliang; Hu Zhengming |
Dept. of Inform. Eng.,Beijing University of Posts and Telecommunications Beijing 100088 |
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Abstract A new soft-output algorithm of decoding is derived from the Bahl algorithm. The complex operations of estimating posterior probabilities and difference metric in the Bahl algorithm are paralleled and well formulated into a set of simple matrix operations which are fit to design efficient VLSI circuits. The probability of uk ≠ uk is quantized with nδ bits and is output together with uk branch code Xk. Thus, the algorithm not only increases the decoding speed, but also provides a soft-output algorithm for multi-level concatenated code.
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Received: 11 August 1997
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