Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1995-09-29
1998-03-03
Eisenzopf, Reinhard J.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455 671, 4552261, 4552264, 375343, 375350, H04B 1700
Patent
active
057246572
ABSTRACT:
An adaptive frequency correction burst detector for GSM handset systems in a wireless communication system is disclosed. The detector uses a bandpass filter to filter the complex received samples to generate a first filtered output r(n). The first filtered output is then applied to a notch filter for the notch filter to adaptively generate a second filtered output y(n). An error calculation unit is used for calculating an error signal based on the difference between the second filtered output y(n) and a desired signal d(n), which is zero in the case of a notch filter. A notch filter coefficient updating unit is used for adaptively updating the notch filter using a least-mean-square algorithm. Then an error power is estimated based on the second filtered output y(n), while the signal power is estimated based on the first filtered output r(n). The power ratio between the two power estimates is compared to a predetermined threshold and if the ratio is below the threshold for a predetermined duration, then the system has detected the FCB signal.
REFERENCES:
patent: 4038540 (1977-07-01), Roberts
patent: 4088833 (1978-05-01), Godard et al.
patent: 5422912 (1995-06-01), Asser et al.
patent: 5465405 (1995-11-01), Baseghi et al.
Lin Jingdong
Zhang Ker
Cray William C.
Eisenzopf Reinhard J.
Le Thanh
Rockwell International Corporation
Yu Philip K.
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