Challenge04_Aliasing

Challenge04_Aliasing - Digital Signal Processing Dr. Fred...

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Dr. Fred J. Taylor, Professor Aliasing Lesson Number: 04 Challenge: IF Sampling An RF receiver is proposed in Figure 1. It consists of a surface acoustic wave (SAW) RF stage whose output is directly sampled by a practical low-power ADC (discussed in a later lesson). The solution uses a numerically controlled oscillator (NCO) and a digital mixer to translate the sampled signal down to baseband. A lowpass filter then extractx a selected subband of frequencies for back-end processing by a general purpose μ p. Figure 1. Hypothetical RF receiver. A 1 MHz wide information process (signal) is assumed to be demodulated to an IF center frequency of 70MHz. The only available ADC for your use operates at a 25.344MHz sampling rate, well below the Shannon sampling rate which is on the order of 150 MHz. Is it possible to make the communication system work properly, and if so, how? Aliasing - 1
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This note was uploaded on 08/21/2010 for the course EEL 5525 taught by Professor Yang during the Summer '09 term at University of Florida.

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Challenge04_Aliasing - Digital Signal Processing Dr. Fred...

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