Adaptive code-tracking receiver for direct-sequence...

Pulse or digital communications – Spread spectrum – Direct sequence

Reexamination Certificate

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C375S149000, C375S150000

Reexamination Certificate

active

07142585

ABSTRACT:
The invention is directed to a method for signal processing in a rake receiver for spread spectrum signals and is directed to a rake receiver for spread spectrum signals including a plurality of rake fingers (9, 10, 11) each rake finger being adapted to receive a signal (7, 8) being part of a multipath signal (2) and associated with a path of the multipath, the signal (7, 8) having a delay (τ) relative to an other signal associated with an other path of the multipath (7, 8), the receiver comprises a summation unit (37) for generating an output signal from the signals received from of at least some of the rake fingers (9, 10, 11), the output signal being a summation signal having and improved signal to noise ratio (SNR) if compared with the signal to noise ratio (SNR) of at least, one of the rake fingers (9, 10, 11), a timing error detector (12) for detecting a delay (τ) between signals of at least two rake fingers (9, 10, 11) and for generating a timing error signal which is sent to a unit (6) for compensating the error of the respective delay (τ); to provide a code-tracking unit for a direct-sequence code division multiple access (DS-CDMA) receiver having an improved tracking performance, especially in cases where delay times of multipath signals are in the order of the chip duration the timing error detector (12) generates a timing error signal (x,13) based on the signals (7, 8) associated with paths of the multipath of more than one rake finger (9, 10, 11).

REFERENCES:
patent: 5361276 (1994-11-01), Subramanian
patent: 5463660 (1995-10-01), Fukasawa et al.
patent: 5719899 (1998-02-01), Thielecke et al.
patent: 5790588 (1998-08-01), Fukawa et al.
patent: 5828705 (1998-10-01), Kroeger et al.
patent: 5978423 (1999-11-01), Farjh
patent: 5987014 (1999-11-01), Magill et al.
patent: 6034986 (2000-03-01), Yellin
patent: 6137788 (2000-10-01), Sawahashi et al.
patent: 6154443 (2000-11-01), Huang et al.
patent: 6175587 (2001-01-01), Madhow et al.
patent: 6215814 (2001-04-01), Ylitalo et al.
patent: 6269075 (2001-07-01), Tran
patent: 6272189 (2001-08-01), Garin et al.
patent: 6456648 (2002-09-01), Bultan et al.
patent: 6456653 (2002-09-01), Sayeed
patent: 6473415 (2002-10-01), Kim et al.
patent: 6480526 (2002-11-01), Shoki et al.
patent: 6532254 (2003-03-01), Jokinen
patent: 6535549 (2003-03-01), Scott et al.
patent: 6567482 (2003-05-01), Popovic
patent: 6570909 (2003-05-01), Kansakoski et al.
patent: 6570918 (2003-05-01), Rademacher
patent: 6600729 (2003-07-01), Suzuki
patent: 6633553 (2003-10-01), Hwang
patent: 6661835 (2003-12-01), Sugimoto et al.
patent: 6683924 (2004-01-01), Ottosson et al.
patent: 6707844 (2004-03-01), Imaizumi et al.
patent: 6714585 (2004-03-01), Wang et al.
patent: 6747969 (2004-06-01), Hirsch
patent: 6757346 (2004-06-01), Saito et al.
patent: 6768727 (2004-07-01), Sourour et al.
patent: 6785323 (2004-08-01), Proctor, Jr.
patent: 6798737 (2004-09-01), Dabak et al.
patent: 6865218 (2005-03-01), Sourour
patent: 2001/0028677 (2001-10-01), Wang et al.
patent: 2002/0034218 (2002-03-01), Papasakellariou et al.
patent: 2002/0044592 (2002-04-01), Razzell
patent: 2002/0051486 (2002-05-01), Aue
patent: 2002/0131479 (2002-09-01), Butler et al.
patent: 2003/0091104 (2003-05-01), Yellin
patent: 2003/0193914 (2003-10-01), Lomp et al.
patent: 2005/0265430 (2005-12-01), Ozluturk et al.
patent: 0 849 887 (1997-12-01), None
patent: 0 993 127 (1999-10-01), None
patent: WO 95/34140 (1995-12-01), None
patent: WO 00/21209 (2000-04-01), None
Vijay K. Garg, “IS-95 CDMA and CDMA 2000,” Prentice Hall PTR, 2000, pp. 60-70.
European Search Report, dated Jun. 30, 2000.
W. Sheen, et al., “A Noncoherent Tracking Loop With Diversity and Multipath Interference Cancellation for Direct-Sequence Spread-Spectrum Systems,”IEEE Transactions on Communications, Nov. 1998, vol. 46, No. 11, pp. 1516-1524.
H. Huang, et al., “Improving Detection and Estimation in Pilot-Aided Frequency Selective CDMA Channel,”IEEE 6thInternational Conference on Universal Person Communications, 1997, vol. 1, pp. 198-201.

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