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The use of turbo codes enhances the data transmission efficiency and optimizes the performance of a communication system over wireless fading channels. In this paper, the authors present a brief overview of the various components of the turbo coding scheme, analyze the complexities of the most popular turbo decoding algorithms and discuss the various implementation methods of the Maximum A Posteriori (MAP) algorithm. The paper considers the well-known log-MAP decoding algorithm by a linear approximation of the correction function used by the max operator. They propose a generalized decoding scheme that optimizes the existing MAP algorithm for faster convergence and better throughput on the basis of varying channel conditions.
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