Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Reexamination Certificate
2005-01-04
2005-01-04
Hudspeth, David (Department: 2681)
Telecommunications
Transmitter and receiver at separate stations
Having measuring, testing, or monitoring of system or part
C455S423000, C455S424000, C455S425000, C455S014000, C455S522000, C455S523000, C455S067110, C455S067120, C455S067130, C455S067140, C455S067150, C455S067160, C455S067700, C455S432300, C455S422100, C370S241000
Reexamination Certificate
active
06839544
ABSTRACT:
There is disclosed a signal monitoring apparatus for use in a wireless network base station containing a modular main unit for processing baseband signals and a modular radio unit separate from the main unit for transmitting and receiving radio frequency (RF) signals. The signal monitoring apparatus is disposed in the radio unit and monitors an RF output signal transmitted by a transceiver in the radio unit. The signal monitoring apparatus comprises an RF mixer that mixes the RF output signal and receiver local oscillator (LO) signal used by the receiver portion of the transceiver to demodulate received RF signals. The RF mixer generates an intermediate frequency (IF) signal capable of being transmitted through a communication line at relatively low signal loss to a signal measuring device located in the main unit or elsewhere.
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Hudspeth David
Nguyen David
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