Pulse or digital communications – Repeaters – Testing
Patent
1978-03-13
1980-09-09
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
455 54, 370 92, H04K 104
Patent
active
042221153
ABSTRACT:
An apparatus is disclosed for a cellular mobile communication system utilizing a spread spectrum. A plurality of fixed base stations is connected with a central processor so that calls originating in any cell can terminate in any other cell. The available frequency spectrum is divided such that one-half is used for mobile-to-base station transmission and the other one-half is used for base station-to-mobile unit transmission. A power control/mobile locator system and method is utilized in all mobile units to compensate for changes in signal level and to maintain the average received signal level at the base station constant regardless of the location of the mobile unit within the cell. In addition, each mobile unit has a unique set of time-frequency coded waveforms that are used for both transmission and reception. The waveforms have large time-bandwidth products so that interfering signals are well suppressed, and which provide a large set of signals so that each user can be assigned a unique set of waveforms. Message modulation is accomplished by digitizing the speech and encoding the resulting binary sequences into the set of waveforms available to the user, while detection is accomplished by a demodulation system and method in which the phases of each received waveform are compared with those of the preceding waveform.
REFERENCES:
patent: 3151295 (1964-09-01), Haviland
patent: 3239761 (1966-03-01), Goode
patent: 3819872 (1974-06-01), Hamrick
patent: 3846583 (1974-11-01), Boulter
patent: 3922678 (1975-11-01), Frenkel
Cooper George R.
Nettleton Raymond W.
Nesbitt John R.
Purdue Research Foundation
Safourek Benedict V.
LandOfFree
Spread spectrum apparatus for cellular mobile communication syst does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Spread spectrum apparatus for cellular mobile communication syst, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spread spectrum apparatus for cellular mobile communication syst will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2227302