A study of different matched filters in digital down converter

The square root (SR) Nyquist filter is always used as matched filter in digital systems to minimize the intersymbol interference (ISI), where the square root raised cosine filter (SRRC) is a popular choice. However, more filter choices substantially provide the engineer more flexibility in applications. Hence, this paper employs the SRRC, SR-Nyquist filter and low pass filter (LPF) as the matched filter in digital down converter (DDC), and evaluates their performance in terms of the noise and interference cancellation. Moreover, the fix-point bit error rate (BER) simulation is carried out to make the study approaching the real-world scenarios.

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