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Complementary error function and Q-function
Analyze the bit error rate (BER) over an AWGN channel for QPSK and QAM. A calculator and a table help you finding out the values of Q(x) and erfc(x) depending on x.
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QAM bit error probability calculator
Calculate the M-ary QAM bit error probability in AWGN depending on energy per bit and the constellation size M.
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dB Calculator
This little tool helps you calculating logarithmic decibels into a linear power value and vice versa.
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Fast Fourier transform (FFT) illustrated
Calculate the FFT of signals. The FFT takes a time-discrete signal and computes the spectrum. Examples of time and frequency signals are shown, DC component, Dirac pulse, cosine, pulse, complex rotating phasor.
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Inverse Fast Fourier transform (IFFT)
Calculate the Inverse Fourier Transform (IFFT). Enter a frequency-based signal and transform it to a time-based Signal.
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Fast Fourier transform (FFT) - power invariant
The power of the FFT output signal differs from the input signal power due to an asymmetry in the FFT / IFFT definitions. This FFT variant keeps input and output signal powers equal.
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Inverse fast Fourier transform (IFFT) - power invariant
The power of the IFFT output signal differs from the input signal power due to an asymmetry in the FFT / IFFT definitions. This IFFT variant keeps input and output signal powers equal.
