Soft decision maximum likelihood decoding method with adaptive m

Details Soft decision maximum likelihood decoding method with adaptive m Soft decision maximum likelihood decoding method with adaptive m

1993-05-07

1996-10-15

Baker, Stephen M.

Excavating

375262, H04L 120, H03M 1312

Patent

active

055661912

ABSTRACT:
There is provided a maximum likelihood decoding method, and an apparatus, capable of correcting burst errors caused by abrupt lowering of the signal amplitude. The soft decision maximum likelihood decoding method is a maximum likelihood decoding method for conducting maximum likelihood decoding on a received train resulting from addition of an error train to a transmission code train, which has been obtained by coding an information train by using convolutional codes on a transmission side. The soft decision maximum likelihood decoding method includes the step of making corrections by multiplying the soft decision likelihood metric having a multi-valued level, which has been obtained by soft decision likelihood metric from the received train, by weighting coefficients depending upon an instantaneous amplitude of the received signal, and the step of conducting maximum likelihood decoding by using corrected soft decision likelihood metric values. Thereby, it becomes possible to enhance the error correcting capability of error correcting apparatuses used in mobile radio communication or the like with severe fading. As a result, communication reliability is increased.

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Matsumoto, Tadashi. "Soft Decision Decoding of Block Codes Using Received Signal Envelope in Digital Mobile Radio," Jan. 1989.
IEEE Journal on Selected Areas in Communications, vol. 7, No. 1, pp. 107-113.
Ungerboeck, G., "Adaptive Maximum-Likelihood Receiver for Carrier-Modulated Data-Transmission Systems", IEEE Trans. on Comm., vol. COM-22, No. 5, May 1974, pp. 624-636.
Subasinghe-Dias et al., "Coded 16 QAM With Channel State Derived Decoding for Fast Fading Land Mobile Channels", International Conf. on Communications, Jun. 23-26, 1991.

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