For performing amplitude-phase demodulation and viterbi decoding

Details For performing amplitude-phase demodulation and viterbi decoding For performing amplitude-phase demodulation and viterbi decoding

1993-12-29

1995-07-25

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

H04L 2706

Patent

active

054369320

ABSTRACT:
A full-duplex-type modem employs a decoding device decoding the data which are subjected to convolution-encoding operation and amplitude-phase modulation. That data is subjected to amplitude-phase demodulation at first; and then, it is subjected to viterbi decoding by which an error correction is carried out. In the amplitude-phase demodulation, an amplitude-phase plane is employed and is divided into a plurality of areas in accordance with an arrangement of signal-placing points which is used by the amplitude-phase modulation. When receiving the data, a certain receiving point is defined. Then, one of the areas to which the receiving point belongs is determined; and its area information is produced. A plurality of candidate paths are determined by referring to the signal-placing points which are arranged around the area to which the receiving point belongs. A distance between the receiving point and each signal-placing point is computed with respect to each of the candidate paths, thus eventually determining a surviving path whose total distance is the smallest. On the basis of the surviving path, a viterbi decoding is performed to determine low-order bits for decoded data. A random-access memory temporarily stores and retains the area information during a predetermined period of time, so that old area information is currently read out. Based on the old area information, high-order bits for the decoded data are determined in accordance with a predetermined algorithm.

REFERENCES:
patent: 5301209 (1994-04-01), Wei

Affiliated with

Also associated with

Rating

For performing amplitude-phase demodulation and viterbi decoding does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with For performing amplitude-phase demodulation and viterbi decoding, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and For performing amplitude-phase demodulation and viterbi decoding will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-745806