Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Reexamination Certificate
2007-10-09
2007-10-09
Urban, Edward F. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
C455S136000, C455S553100, C455S183200
Reexamination Certificate
active
10874459
ABSTRACT:
A multimode wireless terminal suitable for received level monitoring for a base station serving as an intersystem handover destination includes a first wireless transmitter-receiver unit for GSM, a second wireless transmitter-receiver unit for WCDMA, and a communication processor unit and an antenna switch unit connected to these wireless transmitter-receiver units. While conducting communication with a WCDMA network system via the second wireless transmitter-receiver unit, a level of a signal received from a GSM base station is monitored via the first wireless transmitter-receiver unit. A communication processor unit determines whether the level monitoring is interfered with by a WCDMA transmission signal, on the basis of a relation between a WCDMA transmission frequency and a reception frequency supplied from the GSM base station. If interference occurs, then the communication processor unit changes circuit characteristics of the first or second wireless transmitter-receiver unit, and thereby suppresses the interference.
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Igarashi Yutaka
Katagishi Makoto
Noda Masaki
Sugiyama Yoshikazu
Le Nhan T.
Renesas Technology Corp.
Urban Edward F.
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