Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1997-10-21
1999-10-26
Pham, Chi H.
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
375344, 455316, 455257, H03D 100, H04L 2706
Patent
active
059740981
ABSTRACT:
The present invention refers to a received signal detector for detecting and demodulating a digital modulated signal wherein a signal detection in a short time can be implemented independently of the signal frame length. The wide-band filter is a filter having a pass frequency band set to the frequency range of received signals to be demodulated. The A/D convertor, first power detector and first averaging circuit measure the average power of a signal having passed through the wide-band filter. The threshold setting circuit sets a threshold from the averaged power. The narrow-band filter filters an output signal of the frequency convertor in a narrower frequency band than the pass frequency band of the wide-band filter. The comparator circuit compares the threshold and the average power of a signal taken out from the second averaging circuit and passing through the narrow-band filter and judges whether the received signal is taken out from the wide-band filter.
REFERENCES:
patent: 3493866 (1970-02-01), Miller
patent: 4203070 (1980-05-01), Bowles et al.
patent: 4280219 (1981-07-01), Lowenschuss et al.
patent: 4619002 (1986-10-01), Thro
patent: 4871973 (1989-10-01), Yoshihara
patent: 4962508 (1990-10-01), Kingston
patent: 4969160 (1990-11-01), Kingston
patent: 5272724 (1993-12-01), Solomon et al.
patent: 5396521 (1995-03-01), Minami
patent: 5416802 (1995-05-01), Ishii
patent: 5574750 (1996-11-01), Peponides et al.
patent: 5596323 (1997-01-01), Erhage
N. Morinaga et al., "Trends in Modulation/Demodulation and Coding Techniques for Mobile Satellite Communications Systems", IEICE Transactions, vol. E 74, No. 8, Aug. 1991, pp. 2211-2219.
Corrielus Jean B
NEC Corporation
Pham Chi H.
LandOfFree
Received signal detector for digital demodulator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Received signal detector for digital demodulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Received signal detector for digital demodulator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-772413