Varying early-late spacing in a delay locked loop

Details Varying early-late spacing in a delay locked loop Varying early-late spacing in a delay locked loop

2005-07-29

2009-08-25

Kim, Kevin Y (Department: 2611)

Pulse or digital communications

Receivers

Interference or noise reduction

Reexamination Certificate

active

07580489

ABSTRACT:
A rake receiver tracks a component of a multipath information signal transmitted over a communication network. The rake receiver aligns and synchronized the component with a locally generated replica of the code sequence that was originally used to spread the information signal at the transmitter side. The rake receiver derives an early de-spread signal using an early shifted version of the replica of the code sequence. The replica is early shifted by a variable delay. The rake receiver also derives a late shifted de-spread signal using a late shifted version of the replica of the code sequence. The replica is late shifted by the same variable delay. The variable delay may be chosen arbitrarily or among a selection of predetermined values. The predetermined values may be selected so that the tracking process is optimized.

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Aue V et al, “A Non-Coherent Tracking Scheme for the Rake Receiver That Can Cope With Unresolvable Multipath” ICC '99. 1999 IEEE International Conference on Communications. Conference Record. Vancouver, CA, Jun. 6-10, 1999, IEEE International Conference on Communications New York, NY: IEEE, US, vol. 3, Jun. 6, 1999, pp. 1917-1921, XP000903700 ISBN: 0-7803-5285-8 figure 2 p. 1917, paragraph I.

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