Method of transmitting low-power frequency hopped spread spectru

Details Method of transmitting low-power frequency hopped spread spectru Method of transmitting low-power frequency hopped spread spectru

1994-12-22

1996-08-13

Cangialosi, Salvatore

Pulse or digital communications

Repeaters

Testing

H04B 1713

Patent

active

055464220

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: 5193101 (1993-03-01), McDonald et al.
patent: 5425049 (1995-06-01), Dent

Affiliated with

Also associated with

Rating

Method of transmitting low-power frequency hopped spread spectru does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of transmitting low-power frequency hopped spread spectru, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of transmitting low-power frequency hopped spread spectru will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1055107