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DUC digital upconversion design
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Upconversion <span style = "font-size: 12.0pt; font-family:" "> DUC is the local oscillator frequency and the signal frequency sum DUC's output 0.2MHz, based oscillator and signal frequency addition, -0.2MHz for image frequency. Its main features include three aspects: first, conversion, digital mixer digital IF signal and numerically controlled oscillator (NCO) generated by multiplying the quadrature local oscillator signal to generate I / Q two-way mixing signals, the flu the signal of interest at the frequency to zero IF; the second is a low pass filter to filter out-of-band signals to extract useful signal; third sample rate conversion, the sampling rate is reduced, in order to facilitate subsequent signal processing, a large range provides a decimation factor designed for broadband or narrowband digital channel capacity
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