H - Electricity – 04 – K
Patent
H - Electricity
04
K
H04K 1/00 (2006.01) H04B 1/707 (2006.01)
Patent
CA 2041913
A receiver for a direct sequence spread-spectrum communication system of the type in which a transmitter mixes a clocked pseudo-random sequence with a modulated carrier for spreading the carrier energy across a wide band of frequencies, comprises a resident clock-driven pseudo-random code generator for locally generating an essentially identical, spectrum despreading code sequence; means for clocking the resident code generator at a nominal frequency which is offset in a predetermined sense from the clock frequency of the transmitted code sequence such that the phase of the locally generated code sequence tends to slide in one direction with respect to the phase of the transmitted code sequence; detection means for determining whether the the locally generated and the transmitted code sequence are phase aligned or misaligned and for sensing their actual, incipient and/or predicted departures from a phase aligned state, and phase control means for adjusting the clock frequency for the resident code generator whenever such a departure is sensed, thereby shifting the phase of the locally generated code sequencein the opposite direction with respect to the transmitted code sequence by an amount which tends to restore the two code sequences to a phase aligned state. In other words, in keeping with this invention, the receiver has a sliding correlator for phase correlating its locally generated code sequence with the transmitted code sequence at the outset of each incoming transmission, together with a phase controller for regulating the rate at which its resident code generator is clocked once such phase correlation has been achieved, whereby the resident code generator of the phase correlated receiver is clocked at substantially the same average frequency as the transmitted code sequence for the balance of the transmission.
Barth Richard M.
Richley Edward A.
Sim & Mcburney
Xerox Corporation
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