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| SIMPLIFICATION OF LOG-MAP ALGORITHM USED FOR TURBO ITERATIVE DECODING |
| Liu Donghua; Tang Chaojing |
| School of Electron. Sci. and Eng., Nat. Univ. of Defence Tech Changsha 410073 China |
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Abstract In this paper, logarithm MAP algorithm used for turbo iterative decoding is analyzed and deduced. Based on the characteristic of turbo coding and decoding and the analysis of branch metric in the trellis, methods of simplifying computation of branch metric and extrinsic information are obtained. And then it is done with the computation of ln(ex+ey) in the log-MAP algorithm to further simplify the complexity of log-MAP. Finally, simulation results and analysis are carried out.
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Received: 05 June 2000
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2001, Vol. 23 
