Frequency hopping code division multiple access system and metho

Details Frequency hopping code division multiple access system and metho Frequency hopping code division multiple access system and metho

1994-08-29

1995-10-17

Swann, Tod R.

Pulse or digital communications

Repeaters

Testing

380 34, 455 331, 379 59, H04J 1306

Patent

active

054597595

ABSTRACT:
A frequency-hopping-communications system, assigned a system bandwidth B, with the system bandwidth B divided into N sets of frequencies, with each set of the N sets of frequencies not having the same frequencies as other sets of the N sets of frequencies, for communicating base-message data to a plurality of remote units. The frequency-hopping-communications system includes a plurality of base stations for communicating base-message data to the plurality of remote units. Each of the base stations has a coverage area divided into a plurality of N concentric regions which are divided into a plurality of N sectors, with each sector of each concentric region assigned one of the N sets of frequencies. For communicating with a selected-remote unit located within a particular sector of a particular-concentric region, each base station has a modulator for converting the base-message data to a form suitable for sending over radio waves, a frequency-hopping device for frequency hopping the converted-base-message data over a set of frequencies assigned to the particular sector of the particular-concentric region, thereby generating a frequency-hopped signal, a controller, responsive to the selected-remote unit being located in the particular sector of the particular-concentric region, for controlling the set of frequencies used by the frequency-hopping device, a power amplifier for amplifying the frequency-hopped signal from the base station to the remote unit, and a base antenna coupled to the power amplifier for radiating the frequency-hopped signal. Each of the remote units has a receiver for recovering from the frequency-hopped signal the base-message data.

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