Claims
- 1. A method of transmitting frequency-hopped spread spectrum data from a remote unit of a reverse paging system, comprising the steps of:
- receiving periodic synchronization information;
- continually monitoring a local repeating pseudo-random code sequence;
- synchronizing the local repeating pseudo-random code sequence to the periodic synchronization information and for selecting a frequency hopping sequence based upon the repeating pseudo-random code sequence;
- inputting the data to be transmitted as a plurality of bits of digital data;
- encoding the bits of digital data using an error correction scheme to produce a larger number of encoded bits of digital data;
- dividing the encoded bits of digital data into groups of encoded bits of digital data;
- duplicating the groups of encoded bits of digital data to produce redundant groups of encoded bits of digital data;
- interleaving the redundant groups of encoded bits of digital data to produce a plurality of interleaved redundant groups of encoded bits of digital data; and
- modulating and serially transmitting each of the plurality of interleaved redundant groups of encoded bits of digital data onto a series of hop frequencies of a frequency-hopped carrier in synchrony with the repeating pseudo-random code sequence.
- 2. A method of decoding the plurality of interleaved redundant groups of encoded bits of digital data of claim 1, comprising the steps of:
- receiving each of the series of hop frequencies of the frequency-hopped carrier, each hop frequency containing one of the plurality of interleaved redundant groups of encoded bits of digital data;
- determining the signal to noise ratio of each of the hop frequencies;
- de-interleaving the interleaved redundant groups of encoded bits of digital data to re-produce the plurality of redundant groups of encoded bits of digital data;
- tabulating individual bits of the redundant groups of encoded bits of digital data to produce table of a plurality of values representing the individual groups;
- weighting each entry in the table of the plurality of values representing the individual groups by the signal to noise ratio of each of the hop frequencies to which each individual bit corresponds to produce weighted values for each of the individual bits; and
- decoding the digital value of each of the weighted values for each of the individual bits.
Parent Case Info
This application is a divisional of 08/158,441, filed Nov. 24, 1993, now U.S. Pat. No. 5,430,759; which is a continuation-in-part of 07/961,776, filed Oct. 15, 1992, now U.S. Pat. No. 5,335,246; which is a continuation-in-part of 07/932,610, filed Aug. 20, 1992, abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
5193101 |
McDonald et al. |
Mar 1993 |
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5425049 |
Dent |
Jun 1995 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
158441 |
Nov 1993 |
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Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
961776 |
Oct 1992 |
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Parent |
932610 |
Aug 1992 |
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