Cryptography – Key management – Having particular key generator
Patent
1991-01-25
1992-09-01
Tarcza, Thomas H.
Cryptography
Key management
Having particular key generator
375114, H04L 900
Patent
active
051446685
ABSTRACT:
In frequency-hopping spread-spectrum systems, it is necessary to maintain frequency and bit synchronization (sync) between the transmitter and receiver in order to maintain quality data recovery at the receiver. Two transmissions in adjacent hop-time intervals may overlap because of various time delays within the system. Collision bits (203 and 207) are used to realign the transmitted messages in time. The base station (103) manufactures (401) the collision bits (203 and 207) and transmits them to the communication unit (101), which echoes back (503) the bits on its next transmission. If the bits received at the base station do not match the bits sent (407), the base station (103) initiates (409) collision maintenance such that the communication unit (101) can adjust its DPLL (331) to realign its transmissions in time.
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Malek Charles J.
McDonald James A.
Cain David
Jenski Raymond A.
Lukasik Susan L.
Motorola Inc.
Parmelee Steven G.
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