Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2006-06-06
2006-06-06
Tieu, Binh K. (Department: 2643)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S010000, C455S504000, C455S506000, C455S517000, C455S067160, C370S342000, C375S142000, C375S150000
Reexamination Certificate
active
07058399
ABSTRACT:
The present invention provides a search window delay tracking procedure for use in a multipath search processor of a CDMA radio receiver. A channel impulse response is estimated for a received signal containing plural paths, each path having a corresponding path delay. A search window defines a delay profile that contains the plural paths of the received signal. A mean or average delay is calculated for the estimated channel impulse response (CIR), and an error is determined between the mean CIR delay and a desired or target delay position of the Cir. search window. An adjustment is made to reduce that error to align the targeted position of the search window and the mean CIR delay. A Doppler frequency is estimated for each path. The adjustment is made taking into account a Doppler effect caused by relative movement between the transmitter and receiver.
REFERENCES:
patent: 3394313 (1968-07-01), Ellis et al.
patent: 5544156 (1996-08-01), Teder et al.
patent: 6104747 (2000-08-01), Jalloul et al.
patent: 6256338 (2001-07-01), Jalloul et al.
patent: 6288674 (2001-09-01), Sengupta et al.
patent: 6373882 (2002-04-01), Atarius et al.
patent: 6542562 (2003-04-01), Ostberg et al.
patent: 2001/0041536 (2001-11-01), Hasegawa
patent: 2002/0054621 (2002-05-01), Kyeong et al.
patent: 2002/0159507 (2002-10-01), Flaig et al.
patent: 99/57819 (1999-11-01), None
patent: 00/38343 (2000-06-01), None
U.S. Appl. No. 09/320,638, filed May 26, 1999.
U.S. Appl. No. 09/070,778, filed May 1, 1998.
Held Ingolf
Klein Oliver
Nixon & Vanderhye P.C.
Telefonaktiebolaget LM Ericsson (publ)
Tieu Binh K.
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