Title:
AUTOMATIC FREQUENCY CONTROL SYSTEMS AND METHODS FOR JOINT DEMODULATION
Document Type and Number:
WIPO Patent Application WO2002069493
Kind Code:
A3
Abstract:
A joint demodulator is configured to generate an estimated first frequency or first frequency error for the first signal and an estimated second frequency or second frequency error for the second signal. A first long-term automatic frequency control is responsive to the estimated first frequency or first frequency error, wherein the joint demodulator is responsive to the first long-term automatic frequency control. A second long-term automatic frequency control is responsive to the estimated second frequency or second frequency error, wherein the joint demodulator is responsive to the second long-term automatic frequency control. First and second local automatic frequency controls also may be included in the joint demodulator, wherein the first long-term automatic frequency control is responsive to the first local automatic frequency control and the second-long-term automatic frequency control is responsive to the second local automatic frequency control. The first long-term automatic frequency control and the second long-term automatic frequency control can produce respective first and second frequency offset signals that are applied to the joint demodulator. Alternatively, a difference between the first and second frequency offsets is applied to the joint demodulator and the first frequency offset is applied to a downconverter that downconverts the jointly received first and second signals and provides the downconverted signals to the joint demodulator.
Inventors:
HAFEEZ ABDULRAUF (US)
ARSLAN HUSEYIN (US)
ARSLAN HUSEYIN (US)
Application Number:
PCT/US2001/046721
Publication Date:
February 13, 2003
Filing Date:
October 19, 2001
Export Citation:
Assignee:
ERICSSON INC (US)
MOLNAR KARL J (US)
HAFEEZ ABDULRAUF (US)
ARSLAN HUSEYIN (US)
MOLNAR KARL J (US)
HAFEEZ ABDULRAUF (US)
ARSLAN HUSEYIN (US)
International Classes:
H04B7/005; H03J7/04; H04B1/16; H04L25/02; H04L25/03; (IPC1-7): H03J7/04; H04L25/03; H04L25/02
Domestic Patent References:
| WO2000013383A1 | 2000-03-09 |
Foreign References:
| EP0936749A1 | 1999-08-18 |
Other References:
MURATA H ET AL: "Joint frequency offset and delay profile estimation technique for nonlinear co-channel interference canceller", PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, 1998. THE NINTH IEEE INTERNATIONAL SYMPOSIUM ON BOSTON, MA, USA 8-11 SEPT. 1998, NEW YORK, NY, USA,IEEE, US, 8 September 1998 (1998-09-08), pages 486 - 490, XP010314572, ISBN: 0-7803-4872-9
ARSLAN H ET AL: "Adjacent channel interference suppression in FDMA/TDMA mobile radio systems using joint demodulation", COMMUNICATIONS, 1998. ICC 98. CONFERENCE RECORD. 1998 IEEE INTERNATIONAL CONFERENCE ON ATLANTA, GA, USA 7-11 JUNE 1998, NEW YORK, NY, USA,IEEE, US, 7 June 1998 (1998-06-07), pages 723 - 727, XP010284693, ISBN: 0-7803-4788-9
ARSLAN H ET AL: "Adjacent channel interference suppression in FDMA/TDMA mobile radio systems using joint demodulation", COMMUNICATIONS, 1998. ICC 98. CONFERENCE RECORD. 1998 IEEE INTERNATIONAL CONFERENCE ON ATLANTA, GA, USA 7-11 JUNE 1998, NEW YORK, NY, USA,IEEE, US, 7 June 1998 (1998-06-07), pages 723 - 727, XP010284693, ISBN: 0-7803-4788-9
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