Selection of multiple propagation paths by successive...

Details Selection of multiple propagation paths by successive... Selection of multiple propagation paths by successive...

2006-02-21

2006-02-21

Bocure, Tesfaldet (Department: 2631)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S148000

Reexamination Certificate

active

07003020

ABSTRACT:
In a spread spectrum receiver, a received signal is despread by a correlator to produce multiple delay profiles, or a sum of autocorrelations, corresponding to multiple propagation paths of the signal. Subtractors are connected in successive stages from the output of the correlator. Corresponding to the subtractors, path searchers are connected to successive taps of the subtractors for respectively detecting the delay profiles produced by the correlator. In each subtractor the output of the corresponding path searcher is subtracted from the output of the subtractor of preceding stage. RAKE fingers are provided for despreading the received signal at delay times respectively determined by the delay profiles detected by the path searchers. The despread signals are maximal-ratio combined.

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