| 摘要 |
A base station receiver increases noise factor by introducing Pseudo-Noise (PN) signals when testing an effect of a cell size by a reverse virtual call in a CDMA2000-1x system. The receiver of the present invention comprises: a Front-End Unit (FEU), an Analog Down-Converter Card Assembly (ADCA), a Digital Down-Converter Card Assembly (DDCA) including an Analog/Digital Converter (ADC) and a Digital Signal Processor (DSP) for processing digital signals, and a Multi-Rate Channel Card Assembly (MCCA). The Digital Signal Processor (DSP) comprises: first and second multipliers for down-converting IF-band digital signals outputted from the ADC into base-band complex signals; a Pseudo-Noise (PN) signal generator for generating PN signals; a PN gain adjuster for adjusting a gain of the PN signal generated from the PN signal generator; first and second adders for adding the base-band complex signals outputted from the first and second multipliers to the Pn signals outputted from the PN gain adjuster, respectively; and first and second automatic gain controllers for controlling 1 (in-phase) and Q (quadrature-phase) signals outputted from the first and second adders for transmission to the MCCA.
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