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Reconfiguration between soft output Viterbi and log maximum a posteriori decoding algorithms

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4 Author(s)

In third generation mobile communication standards (UMTS, cdma2000 and Japanese W-CDMA) different kinds of encoding are specified for different types of services and channels-convolutional, turbo, Reed-Solomon and CRC. Decoding may use any suitable algorithm, with prime candidates being versions of the Viterbi algorithm (with soft or hard output), and the maximum a posteriori probability algorithm, with its derivatives log-MAP and max-log-MAP. It would be advantageous to be able to select the optimum algorithm in any circumstance. The paper examines the reconfiguration between SOVA and log-MAP decoding algorithms. The performance of log-MAP is higher than SOVA, but with more complexity and delay. The two algorithms are analysed into component operations and blocks and the common parts are identified

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3G Mobile Communication Technologies, 2000. First International Conference on (Conf. Publ. No. 471)

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