Pulse or digital communications – Repeaters – Testing
Patent
1994-12-22
1996-03-12
Cangialosi, Salvatore
Pulse or digital communications
Repeaters
Testing
H04B 1713
Patent
active
054992664
ABSTRACT:
An acknowledgement paging system is described which fits within the existing infrastructure of a paging network and which provides low cost manufacture and low power operation while still enabling the acknowledgement paging over long distances. The acknowledgement paging system consists of a standard paging transmitter and a plurality of remote paging units which respond to a page using frequency-hopped spread-spectrum differential bi-phase shift keying communications. The plurality of pagers are assigned to groups with each group being assigned a separate starting location in a common, repeating pseudo-random noise code which determines the frequency hops. The grouping of pagers minimizes the collisions of acknowledgment transmissions between groups and the enables a large number of paging units to operate within a single geographic area. The pagers include a special double loop PLL synthesizer to produce an accurate narrow band frequency and to change or hop frequencies in a rapid fashion. The base receiving unit employs special algorithms for retrieving very low power acknowledgement paging messages in a noisy environment by using data redundancy, data interleaving, soft decoding and error correction codes to strip the bi-phase-modulated, frequency-hopped spread-spectrum digital data transmitted from the remote pocket pagers. A history of the frequency and phase drift is used during reception of the acknowledgement messages to predict the phase and frequency drift of the encoded digital information to further reduce decoding error. Signal to noise ratios are determined for each frequency hop and relatively noisy hops are discarded or minimized in a soft decoding process based redundancy of data bits.
REFERENCES:
patent: Re32365 (1987-03-01), Sebestyen
patent: 3223779 (1965-12-01), McFarlane
patent: 3384822 (1968-05-01), Miyagi
patent: 3447085 (1969-05-01), De Haas et al.
patent: 3493866 (1970-02-01), Miller
patent: 3706933 (1972-12-01), Bidell et al.
patent: 3824468 (1974-07-01), Zegers et al.
patent: 3972042 (1976-07-01), Johnson
patent: 4030033 (1977-06-01), Bibl et al.
patent: 4053889 (1977-10-01), Johnson
patent: 4079378 (1978-03-01), Hulderman
patent: 4114155 (1978-09-01), Raab
patent: 4152702 (1979-05-01), Piesinger
patent: 4156877 (1979-05-01), Piesinger
patent: 4188629 (1980-02-01), Johnson
patent: 4193030 (1980-03-01), Rabow et al.
patent: 4222115 (1980-09-01), Cooper et al.
patent: 4229741 (1980-10-01), Groth, Jr.
patent: 4267592 (1981-05-01), Craiglow
patent: 4309703 (1982-01-01), Blahut
patent: 4403343 (1983-09-01), Hamada
patent: 4447907 (1984-05-01), Bjornholt et al.
patent: 4479226 (1984-10-01), Prabhu et al.
patent: 4479227 (1984-10-01), Bjornholt
patent: 4494238 (1985-01-01), Groth, Jr.
patent: 4545059 (1985-10-01), Spinks, Jr. et al.
patent: 4578819 (1986-03-01), Shimizu
patent: 4607375 (1986-08-01), Lee
patent: 4611333 (1986-09-01), McCallister et al.
patent: 4644351 (1987-02-01), Zabarsky et al.
patent: 4665404 (1987-05-01), Christy et al.
patent: 4694466 (1987-09-01), Kadin
patent: 4698781 (1987-10-01), Cockerell, Jr.
patent: 4701934 (1987-10-01), Jasper
patent: 4703474 (1987-10-01), Foschini et al.
patent: 4740792 (1988-04-01), Sagey et al.
patent: 4747122 (1988-05-01), Bhagat et al.
patent: 4750036 (1988-06-01), Martinez
patent: 4785463 (1988-11-01), Janc et al.
patent: 4811379 (1989-03-01), Grandfield
patent: 4823123 (1989-04-01), Siwiak
patent: 4825193 (1989-04-01), Siwiak et al.
patent: 4866732 (1989-09-01), Carey et al.
patent: 4868560 (1989-09-01), Oliwa et al.
patent: 4875038 (1989-10-01), Siwiak et al.
patent: 4882579 (1989-11-01), Siwiak
patent: 4891637 (1990-01-01), Siwiak et al.
patent: 4928177 (1990-05-01), Martinez
patent: 5005183 (1991-04-01), Carey et al.
patent: 5017926 (1991-05-01), Ames et al.
patent: 5021794 (1991-06-01), Lawrence
patent: 5063560 (1991-11-01), Yerbury et al.
patent: 5073899 (1991-12-01), Collier et al.
patent: 5073900 (1991-12-01), Mallinckrodt
patent: 5097485 (1992-03-01), O'Connor et al.
patent: 5099245 (1992-03-01), Sagey
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5105435 (1992-04-01), Stilwell
patent: 5111478 (1992-05-01), McDonald
patent: 5142279 (1992-08-01), Jasinski et al.
patent: 5142534 (1992-08-01), Simpson et al.
patent: 5144668 (1992-09-01), Malek et al.
patent: 5148452 (1992-09-01), Kennedy et al.
patent: 5153582 (1992-10-01), Davis
patent: 5155742 (1992-10-01), Ariyavisitakul et al.
patent: 5164958 (1992-11-01), Omura
patent: 5191593 (1993-03-01), McDonald et al.
patent: 5193101 (1993-03-01), McDonald et al.
patent: 5193102 (1993-03-01), Meidan et al.
patent: 5204876 (1993-04-01), Bruckert et al.
patent: 5210771 (1993-05-01), Schaeffer et al.
patent: 5212831 (1993-05-01), Chuang et al.
patent: 5222101 (1993-06-01), Ariyavisitakul et al.
patent: 5224121 (1993-06-01), Schorman
patent: 5226045 (1993-07-01), Chuang
patent: 5235615 (1993-08-01), Omura
patent: 5239677 (1993-08-01), Jasinski
patent: 5267261 (1993-11-01), Blakeney, II et al.
patent: 5331638 (1994-07-01), Honkasalo et al.
patent: 5335246 (1994-08-01), Yokev et al.
patent: 5379047 (1995-01-01), Yokev et al.
patent: 5430759 (1995-07-01), Yokev et al.
John Proakis; "Spread Spectrum Signals for Digital Communications"; Digital Communications; McGraw-Hill Book Company; New York; 845-860.
Par Lautier, "Reseau de radiocommunication numerique en Duplex Temporel", Revue Technique Thompson--CSF, 10, No. 3, 557-570 (Sep. 1978).
Harel Haim
Meiman Yehouda
Yokev Hanoch
Cangialosi Salvatore
NEXUS 1994 Limited
LandOfFree
Low-power frequency-hopped spread spectrum acknowledgement pagin does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Low-power frequency-hopped spread spectrum acknowledgement pagin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low-power frequency-hopped spread spectrum acknowledgement pagin will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2106089