Pulse or digital communications – Testing – Signal noise
Patent
1997-11-21
2000-05-09
Vo, Don
Pulse or digital communications
Testing
Signal noise
H04B 1700, H04B 346, H09L 120
Patent
active
060613947
ABSTRACT:
A digital communication system modulated signal generation apparatus incorporates a fading simulator for adding fading to a signal to be transmitted to a device to be tested. A baseband signal generation unit generates a digital baseband signal at a predetermined clock rate, and sequentially outputs time information corresponding to the predetermined clock rate. A fading parameter generation unit receives the time information sequentially output from the baseband signal generation unit together with the digital baseband signal, and output a desired fading parameter set in advance in correspondence with the time information. A fading addition operation unit executes a fading addition operation for the digital baseband signal output from the baseband signal generation unit by using the desired fading parameter output from the fading parameter generation unit, and outputs a signal indicating the result. A digital/analog conversion unit D/A-converts the signal output from the fading addition operation unit. A quadrature modulation unit quadrature-modulates the signal converted by the digital/analog conversion unit, and outputs the quadrature-modulated signal as a modulated signal.
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Anritsu Corporation
Phu Phuong
Vo Don
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