Power-efficient acquisition of a CDMA pilot signal

Details Power-efficient acquisition of a CDMA pilot signal Power-efficient acquisition of a CDMA pilot signal

1996-08-29

1998-07-14

Ton, Dang

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

370441, 375205, H04J 1302

Patent

active

057815437

ABSTRACT:
A system and method for acquiring a code division multiple access (CDMA) pilot signal having a pilot pseudonoise (PN) code offset in a CDMA communication system. A received signal is correlated with a first set of PN code offset hypotheses. If this first "full" search is unsuccessful in acquiring the CDMA pilot signal, the method includes waiting for a first period, and then correlating the received signal with a second set of PN code offset hypotheses which are a subset of said first set of PN code offset hypotheses and therefore requires less search time. If this "mini" search is unsuccessful in acquiring the CDMA pilot signal the method includes waiting for a second period and then quickly measuring the energy of the received signal. If the received energy exceeds a threshold, then a "mini" search is immediately performed. These alternating search techniques of full, mini, micro are repeated.

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