Device for canceling interference

Details Device for canceling interference Device for canceling interference

2005-11-22

2005-11-22

Ghayour, Mohammed (Department: 2631)

Pulse or digital communications

Spread spectrum

Direct sequence

Reexamination Certificate

active

06967991

ABSTRACT:
A delay device102sends reception signals to a subtraction device113after delaying it by a predetermined time. Matched filters103-1˜103-N perform despreading operation of the reception signals. RAKE-combining devices104-1˜104-N perform RAKE-combining operation of the signals after the despreading operation. Discrimination devices105-1˜105-N perform hard decision of the signals after the RAKE-combining operation. A decision value buffer107stores the signals after the hard decision. Likelihood calculation devices106-1˜106-N calculate likelihood of all the symbols. A likelihood buffer108stores calculated likelihood. A controlling part110controls a switch109. A ranking decision device111decides a ranking based on the likelihood. A re-spreading device112performs re-spreading operation of a symbol with the highest likelihood ranking. And a subtraction device113subtracts the re-spreading result from the delayed reception signals.

REFERENCES:
patent: 5619524 (1997-04-01), Ling et al.
patent: 6002727 (1999-12-01), Uesugi
patent: 6282233 (2001-08-01), Yoshida
patent: 6396867 (2002-05-01), Tiedemann et al.
patent: 6501788 (2002-12-01), Wang et al.
patent: 10065572 (1998-03-01), None
patent: 10126383 (1998-05-01), None
patent: 10308690 (1998-11-01), None
patent: 11266184 (1999-09-01), None
patent: 11266226 (1999-09-01), None
Yoshino et al., “Interference Canceling Equalizer (ICE) for Mobile Radio Communications”, IEEE International Conference on Communications 1994, Conference Record, Serving Humanity through Communications, May 1-5, 1994, vol. 3, pp. 1427-1432.
PCT International Search Report dated Jul. 4, 2000.
Mitsuru Uesugi et al., “Improvement the Characteristics of SRIC (Symbol Ranking Type Interference Canceller),” Extended Abstracts of General Meeting, IEICE, Tsushin 1, SB-4-2 (Jun. 3, 1998), pp. 715-716 (in Japanese) with partial translation (in English) thereof.
Mitsuru Uesugi et al., “A Study about an Interference Canceller for Uplink Signal of CDMA System,” Technical Report of IEICE, DSP96-115, SAT96- 110, RCS96-121 (Jan. 1997), pp. 51-56 (in Japanese) with abstract (in English) thereof.
Mamoru Sawahashi et al., “Serial Canceler Using Recursive Channel Estimation by Pilot Symbols for DS-CDMA,” Technical Report of IEICE, SAT95-14, RCS95--50 (Jul. 1995), pp. 43-48 (in Japanese) with abstract (in English) thereof.

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