Trellis decoder

Details Trellis decoder Trellis decoder

1990-10-12

1992-05-05

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

371 43, H04L 2706

Patent

active

051114836

ABSTRACT:
An improved trellis code modulation (TCM) decoder for the land mobile environment is provided. According to the invention, a frequency discriminator is placed at the output of the pilot extraction filter and its output passed through a soft limiter and used to modify the metric used by the Viterbi decoder. Under high signal conditions, the output of the discriminator is small and the Euclidian metric is used. During deep fades and especially during a rapid phase change, the output of the discriminator is large and can be used to modify the metric. While the invention is particularly useful for the land mobile environment, it can easily be applied to other types of pilot assisted TCM schemes over Rayleigh faded channels.

REFERENCES:
patent: 4945549 (1990-07-01), Simon et al.

Affiliated with

Also associated with

Rating

Trellis decoder does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Trellis decoder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Trellis decoder will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1419033