Wave Walker DSP

DSP Algorithms for RF Systems

DSP: Intermediates

Figure 3: Increasing the delay M increases the number of teeth in the comb filter and reduces their width. Note that the magnitude has been normalized to 0 dB gain at omega=0.

Comb Filter Introduction and Analysis

March 1, 2023

Figure 1: Magnitude of the frequency response for the band pass single pole IIR filter.

Band Pass Single Pole IIR Filter Design

February 1, 2023

Matt Ettus on Fading Models

June 22, 2022

The 16-QAM constellation diagram.

Building a PSK and QAM Modulator in Python

June 8, 2022

Figure 7: Increasing the length of the signal by 2 improved the DFT frequency resolution by a factor of 2! Compare the frequency response of Figure 6, both of which have 8-point DFTs.

DFT Frequency Resolution Explained

March 16, 2022

Figure 2: The impulse response and frequency response of the LPF after the FIR filter gain is normalized to 0 dB at omega = 0.

Designing FIR Filter Gain

February 23, 2022

Figure 5: The impulse response of an odd length SRRC allows for optimal sampling by being able to select the peak at n=0. An even length SRRC filter does not.

Why an FIR Filter Should Have an Odd Length

December 29, 2021

Figure 4: The frequency domain for the real passband version of the BPSK signal with noise.

Efficient Real to Complex Conversion with a Half Band Filter

December 15, 2021

Figure 2: An example frequency response for a half band filter designed with halfBandDesign.py.

Half Band Filter Design Function in Python

December 8, 2021

Figure 2: The frequency responses for three different square root raised cosine filters.

Square Root Raised Cosine Filter in Python

November 10, 2021

God, the Lord, is my strength; he makes my feet like the deer’s; he makes me tread on my high places. Habakkuk 3:19

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