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Everything about Continuous phase modulation

Method for modulation of data

Continuous phase modulation (CPM) is a method for modulation of data commonly used in wireless modems. In contrast to other coherent digital phase modulation techniques where the carrier phase abruptly resets to zero at the start of every symbol, with CPM the carrier phase is modulated in a continuous manner. For instance, with QPSK the carrier instantaneously jumps from a sine to a cosine whenever one of the two message bits of the current symbol differs from the two message bits of the previous symbol. This discontinuity requires a relatively large percentage of the power to occur outside of the intended band, leading to poor spectral efficiency. Furthermore, CPM is typically implemented as a constant-envelope waveform, i.e., the transmitted carrier power is constant. Therefore, CPM is attractive because the phase continuity yields high spectral efficiency, and the constant envelope yields excellent power efficiency. The primary drawback is the high implementation complexity required for an optimal receiver. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: Continuous phase modulationA 5-minute orientation
  2. Skim a recent paper: Electrically Tunable Reflective Metasurfaces with Continuous and Full-Phase Modulation for High-Efficiency Wavefront Control at Visible FrequenciesInfluential work since 2022
  3. Pick up a classic book: Signals and SystemsThe most-reprinted book on the subject
  4. Read the landmark paper: Continuous Phase Modulation--Part I: Full Response SignalingCited 505 times
  5. Go sideways: Signal modulationA closely related topic
  6. Go sideways: Frequency-shift keyingA closely related topic

📖 Definitions

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🗂️ The subject at a glance

  1. Phase memory
  2. Phase trajectory
  3. Partial response CPM
  4. Continuous-phase frequency-shift keying

🏆 Landmark papers (most cited)

🆕 Influential since 2022

📚 Books worth reading

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🔗 Related topics