This document provides an overview of continuous phase modulation (CPM) techniques. It discusses how CPM works by gradually changing the phase of the carrier signal over the symbol duration for each symbol. Commonly, CPM uses raised cosine or Gaussian filters for detection to prevent inter-symbol interference. Minimum-shift keying is a form of CPM that uses a linear phase trajectory with an excess bandwidth of 1/2. Partial response CPM can also be used to introduce a controlled amount of inter-symbol interference. The document provides examples of CPM variations like continuous phase frequency shift keying and discusses CPM pulse shapes and references.