Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Patent
1998-08-04
2000-08-22
Vo, Nguyen
Telecommunications
Transmitter and receiver at separate stations
Having measuring, testing, or monitoring of system or part
455126, 4551922, 455257, H04B 1700, H04B 118
Patent
active
061085251
ABSTRACT:
The transceiver of the present invention comprises: a modulator for modulating predetermined data to obtain a received signal at a predetermined received frequency; a local oscillator for producing a local oscillator frequency signal; a mixer for producing an intermediate frequency signal by mixing the local oscillator frequency signal and the received signal; a band pass filter for limiting a bandwidth of the immediate frequency signal; a demodulator for obtaining received data by demodulating the immediate frequency signal the bandwidth of which has been limited; a measuring device for measuring receiving sensitivity by comparing the received data with the predetermined data; and a frequency correction determinator for correcting a frequency of the local oscillator frequency signal and for setting the corrected frequency as a new frequency of the local oscillator frequency signal when a desired measuring result is obtained in the measuring device.
REFERENCES:
patent: 5115515 (1992-05-01), Yamamoto et al.
patent: 5493710 (1996-02-01), Takahara et al.
NEC Corporation
Vo Nguyen
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