Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1997-09-19
1999-09-14
Vo, Don N.
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
375368, 714794, H03D 100
Patent
active
059533781
ABSTRACT:
Likelihood calculating circuit A1 calculates the hamming distance between a received data series and a unique word as likelihood data d1. Likelihood calculating circuit A2 calculates the number of transmission errors using redundant data, and outputs this value as likelihood data d2. Likelihood data d1,d2 are added at adding circuit 21, and the output thereof is compared to the threshold value of determination circuit with threshold 22. The results of this comparison are output as determination signal with threshold DT. Synchronous determination circuit 23 generates a synchronous determination signal SD based on determination signal with threshold DT. Accordingly, the present invention provides a frame synchronization circuit in which it is possible to avoid out of synchronization or false synchronization, without increasing the amount of redundancy necessary to detect frame synchronization.
REFERENCES:
patent: 5436928 (1995-07-01), Fukuawa et al.
patent: 5481572 (1996-01-01), Skold et al.
patent: 5559757 (1996-09-01), Catipovic et al.
patent: 5761252 (1998-06-01), Iinuma
patent: 5790588 (1998-08-01), Fukawa et al.
Hotani Sanae
Kawahara Toshirou
Miki Toshio
Jiang Lenny
NTT Mobile Communications Network Inc.
Vo Don N.
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