Tracking of a multi-path resolved signal in a rake receiver

Details Tracking of a multi-path resolved signal in a rake receiver Tracking of a multi-path resolved signal in a rake receiver

2005-05-31

2005-05-31

Chin, Stephen (Department: 2631)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S150000

Reexamination Certificate

active

06901105

ABSTRACT:
A resolved component of a multi-path signal is assigned to a rake finger of a spread spectrum rake receiver. The resolved component is variably delayed. On the variably delayed resolved component, an early-late detection is performed so as to determine whether the resolved component arrived early or late with respect to an optimum arrival time. A first pulse is generated if the early-late detection determines that said resolved component arrived early. A second pulse is generated if the early-late detection determines that the resolved component arrived late. The first and second pulses are counted. The first pulse causes counting in a first direction and the second pulse causes counting in a second direction. From the counting, a fractional-chip delay timing adjustment signal is derived, and fed back to adjust the variably delaying of the resolved component. Also from the counting a chip delay phase adjustment signal is derived, and fed back to control a phase of a pseudo-noise generator.

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“Simulation and Implementation of a Rake Receiver for Direct Sequence spread Spectrum WLAN-Terminals”, D. Hunold, Master's Thesis, Stockholm, Oct. 25, 1996, Royal Institute of Technology, Kista, Sweden, Abstract and pp. 53-59.

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