Digital Frontend Design for Four-band Aliasing Signals

In the application of bandpass sampling(BPS), aliasing limits the flexibility of BPS receivers. This paper proposes a method that utilizes a fourth-order bandpass sampling structure with tunable delays to eliminate aliasing via digital signals. The proposed algorithm solves the problem of four signals overlapped simultaneously. Simulation results demonstrate that bandpass signals at arbitrary positions around 0.5-3 GHz can be received through the same receiver and aliasing is suppressed by more than 25dB. This method can reduce hardware burden and use software to solve the aliasing problem, which can be used in multi-band receiver.