Telecommunications – Receiver or analog modulated signal frequency converter – Measuring or testing of receiver
Reexamination Certificate
2007-03-01
2009-12-29
Le, Thanh C (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Measuring or testing of receiver
C455S254000, C455S266000
Reexamination Certificate
active
07639997
ABSTRACT:
The communication performance of a radio communication system is improved while keeping short time necessary for attaining synchronization. A low noise amplifier is selectively provided with one of an input signal supplied from the outside of the system and an oscillation output signal of a local oscillator. A mixer integrates the oscillation output signal of the local oscillator and an output signal of the low noise amplifier. An intensity discriminating unit discriminates the signal intensity of an output of the mixer. In a first state, the low noise amplifier amplifies the oscillation output signal of the local oscillator, and a control unit learns a frequency band of the low noise amplifier for maximizing the signal intensity on the basis of the discrimination result of the intensity discriminating unit. In a second state, the low noise amplifier is set to the frequency band learned in the first state and amplifies the input signal.
REFERENCES:
patent: 2004/0198288 (2004-10-01), Sadowski
patent: 2005/0013386 (2005-01-01), Ojard
Tanaka, A., et al. “Low Noise Amplifier with Center Frequency Hoping for an MB-OFDM UWB Receiver” Joint Conference on Ultrawideband Systems and Technologies, International Workshop on IEEE, Mar. 18-21, 2004, pp. 420-423.
Watanabe Manabu
Yamaoka Yuusuke
Le Thanh C
McDermott Will & Emery LLP
Panasonic Corporation
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