Method and device for the reception of signals affected by inter

Details Method and device for the reception of signals affected by inter Method and device for the reception of signals affected by inter

1995-12-26

1998-10-20

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

371 437, H03D 100, H04L 2706

Patent

active

058258329

ABSTRACT:
For the reception of TCM modulated signals a receiver is used which comprises two cascaded Viterbi decoders. The first decoder operates according to a soft output Viterbi algorithm (SOVA), and its output comprises a hard decision on the transmitted symbols as well as a reliability parameter. The output of the first decoder, which is intended essentially to take into account the memory effects of the channel by contrasting the influence of inter-symbol interference, is fed, possibly after a de-interleaving action, to the second Viterbi decoder which carries out the actual decision. The preferred application is to digital communication systems such as microwave radio links.

REFERENCES:
Sundberg, Generalizations of the Viterbi Algorithm with Applications to Mobile Radio Systems, 1992 IEEE International Conference on Selected Topics in Wireless Communications, pp. 11-14.
Nill et al., Viterbi Algorithms with List and Soft Symbol Output: Extensions and Comparisons, IEEE Global Telecommunications Conference, vol. 2 of 4, pp. 788-792, 1993.
Li et al., Optimum Soft-output Detection for Channels with Intersymbol Interference, IEEE Transactions on Information Theory, vol. 41, No. 3, pp. 704-713, May 1995.

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