Pulse or digital communications – Repeaters – Testing
Patent
1991-07-10
1993-01-12
Cangialosi, Salvatore
Pulse or digital communications
Repeaters
Testing
H04L 2730
Patent
active
051795710
ABSTRACT:
An apparatus for controlling handoff in a spread-spectrum-CDMA-communications system, of radio devices moving from a cell having a base station which transmits a first spread-spectrum-communications signal with a first generic-chip-code signal, toward a different cell having a base station for transmitting a second spread-spectrum-communications signal with a second generic-chip-code signal. A radio device includes a PCN antenna, a first matched filter having an impulse response matched to the first generic-chip-code signal and a first detector for detecting the first generic-chip-code signal embedded in the first spread-spectrum-communications signal. A second matched filter has an impulse response matched to the second generic-chip-code signal and a second detector detects the second generic-chip-code signal embedded in the second spread-spectrum-communications signal. A comparator generates a comparison signal by comparing the first detected signal with the second detected signal. A receiver-message-chip-code generator generates a replica of the message-chip-code signal and a message mixer, using a replica of the message-chip-code signal, despreads the spread-spectrum-communications signal as a modulated-data signal. A synchronization circuit, based on the comparison signal being greater than a threshold, synchronizes the receiver-message-chip-code generator to the first generic-chip-code signal for receiving the first spread-spectrum-communications signal, and in response to the comparison signal being less than the threshold, synchronizes the receiver-message-chip-code generator to the second generic-chip-code signal for receiving the second spread-spectrum-communications signal. A control unit switches transmitting the message data, spread-spectrum processed with a message-chip-code signal, embedded in the first spread-spectrum-communications signal from the first base station, to the second spread-spectrum-communications signal transmitted from the second base station.
REFERENCES:
patent: 4425642 (1984-01-01), Moses et al.
patent: 4862178 (1989-08-01), Sturza et al.
patent: 4977578 (1990-12-01), Ishigaki et al.
patent: 4984247 (1991-01-01), Kaufmann et al.
patent: 5056109 (1991-10-01), Gilhousen et al.
Cangialosi Salvatore
SCS Mobilecom, Inc.
LandOfFree
Spread spectrum cellular handoff apparatus and method 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 cellular handoff apparatus and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spread spectrum cellular handoff apparatus and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1224904