
Building a PSK and QAM Modulator in Python posted on June 8, 2022
Using Euler’s Formula to Derive Sine and Cosine posted on November 24, 2021
Can the Fourier Transform Magnitude Be Negative? posted on February 16, 2022
Polyphase Half Band Filter for Decimation by 2 posted on September 29, 2021
Engineering Mindset: Be a Stone Carver, not a Brick Mason posted on September 18, 2021
Time Invariant and Time Varying Filters posted on September 3, 2021
Derivative Filter Impulse Response Derivation posted on November 24, 2021
Cross Correlation: Explaining Time Lags posted on January 12, 2022
Power and Energy in Discrete-Time Signals posted on December 1, 2023
Complex Frequency Shifting in Discrete Time posted on January 1, 2023








![A BPSK signal s[n], real Gaussian noise w[n], and the received signal x[n] = s[n] + w[n] for SNR = 20 dB](https://www.wavewalkerdsp.com/wp-content/uploads/2023/12/HowToComputeSignalToNoiseRatioSNRInSimulation_signalNoiseTimeDomain-300x240.png)
The third edition of DSP for Beginners: Simple Explanations for Complex Numbers! Includes a new chapter on sampling.