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Introduction to Interpolation and Upsampling posted on September 1, 2022
Polyphase Half Band Filter for Decimation by 2 posted on September 29, 2021
Cross Correlation Explained With Real Signals posted on December 1, 2021
How Euler’s Formula Relates Triangles, the Unit Circle and Complex Sinusoids posted on September 16, 2021
FIR Low Pass Filter Design with Remez posted on September 22, 2021
How to Create Additive White Gaussian Noise (AWGN) posted on June 1, 2022
Square Root Raised Cosine Filter in Python posted on November 10, 2021
Deriving the Ideal Low Pass Filter (LPF) posted on October 1, 2022
Trigonometric Identity: sin(x)^2 + cos(x)^2 = 1 posted on March 9, 2022








![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.