Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-04-25
2006-04-25
Bocure, Tesfaldet (Department: 2631)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S149000, C375S232000
Reexamination Certificate
active
07035316
ABSTRACT:
A receive filter receives signals from a communication channel. The received signals correspond to original Walsh covered chip sequences transmitted by a transmit filter through the communication channel to the receive filter. The received signals are processed by an equalizer to generate a soft estimate of chip sequences corresponding to the original Walsh covered chip sequences. An N chip Walsh decover is then utilized to generate a soft estimate of code symbols corresponding to the soft estimate of the chip sequences. A number of symbol slicers are then used in parallel to produce a hard estimate of the code symbols corresponding to the soft estimate of code symbols generated by the N chip Walsh decover. Thereafter an N chip Walsh cover is used as part of a scheme to generate a hard estimate of chip sequences corresponding to the hard estimate of the code symbols generated by the symbol slicers. The hard estimate of the chip sequences generated with the aid of the N chip Walsh cover, and the soft estimate of the chip sequences generated by the equalizer, are used to generate a tracking mode error signal to adapt the response of the equalizer to the received signals.
REFERENCES:
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5353300 (1994-10-01), Lee et al.
patent: 5692006 (1997-11-01), Ross
patent: 6175588 (2001-01-01), Visotsky et al.
patent: 6522683 (2003-02-01), Smee et al.
Jaeyoung Kwak et al. “Blind Adaptive Space-Time Receiving and Transmitting Diversities for Multiuser DS-CDMA Systems,” IEEE Military Communications Conference, Oct. 31, 1999, Nov. 3, 1999, pp. 924-928.
Teng Joon Lim et al. “Convergence Analysis of Chip-and Fractionally Spaced LMS Adaptive Multiuser CDMA Detectors,” IEEE Transactions On Signal Processing, vol. 48, No. 8, Aug. 2000, pp. 2219-2228.
Leon Berner et al. “Parallel Digital Architectures for High-Speed Adaptive DSSS Receivers,” Asilomar Conference On Signals, Systems and Computers, Oct. 29, 2000, Nov. 3, 2000, vol. 2.
Jalali Ahmad
Ling Fuyun
Smee John E.
Wallace Mark
Beladi S. Hossain
Bocure Tesfaldet
Godsey Sandra L.
Qualcomm Incorporated
Wadsworth Philip
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