Method of selecting propagation delays retained for receiving me

Details Method of selecting propagation delays retained for receiving me Method of selecting propagation delays retained for receiving me

1996-07-19

1998-10-06

Chin, Wellington

Pulse or digital communications

Repeaters

Testing

455 671, 455 63, 455 673, 455132, 375254, 375285, 375346, H04J 1302

Patent

active

058188665

ABSTRACT:
The signal received in a CDMA system is sampled at a rate greater than the chip rate of the spreading sequences. In order to assign the propagation delays to the arms of a rake receiver, consecutive delays are tested within a time window by evaluating, for each delay tested, an energy of the correlation between the signal received and a reference spreading sequence to which said tested delay is applied. A selection threshold is determined from the largest of the energies evaluated. A first list is compiled containing delays from the window for which the histogram of the evaluated energies exhibits a local maximum greater than the selection threshold, and a second list is compiled containing delays neighboring the delays of the first list. The delays assigned to the arms of the rake receiver are selected initially from the first list and then, if this is insufficient, from the second list.

REFERENCES:
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patent: 5361276 (1994-11-01), Subramanian
patent: 5448600 (1995-09-01), Lucas
patent: 5563610 (1996-10-01), Reudink
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patent: 5646958 (1997-07-01), Tsujimoto
patent: 5671221 (1997-09-01), Yank
"Architecture Simplifications for an Improved Performance Rake Receiver" Le Strat E., pp. 726-729.
Proakis, J.G. "Digital Communications", 1989 pp. 728-734.

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