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2. List of free electronics circuit simulators - Wikipedia

   en.wikipedia.org/wiki/List_of_free_electronics...

   List of free analog and digital electronic circuit simulators, available for Windows, macOS, Linux, and comparing against UC Berkeley SPICE. The following table is split into two groups based on whether it has a graphical visual interface or not.

3. List of finite element software packages - Wikipedia

   en.wikipedia.org/wiki/List_of_finite_element...

   Finite element software for structural, geotechnical, heat transfer and seepage analysis: Intuition Software: 5.11: 2016-01: Proprietary software: Free educational version available [17] Mac OS X, Windows: JCMsuite: Finite element software for the analysis of electromagnetic waves, elasticity and heat conduction: JCMwave GmbH: 5.4.3: 2023-03-09 ...

4. Category:Free diagramming software - Wikipedia

   en.wikipedia.org/wiki/Category:Free_diagramming...

   Free and open-source software portal; This is a category of articles relating to diagramming software which can be freely used, copied, studied, modified, and redistributed by everyone that obtains a copy: "free software" or "open source software".

5. Amplitude and phase-shift keying - Wikipedia

   en.wikipedia.org/wiki/Amplitude_and_phase-shift...

   Quadrature amplitude modulation (QAM) can be considered a subset of APSK because all QAM schemes modulate both the amplitude and phase of the carrier. Conventionally, QAM constellations are rectangular and APSK constellations are circular, however this is not always the case.

6. Quadrature amplitude modulation - Wikipedia

   en.wikipedia.org/wiki/Quadrature_amplitude...

   But the sender and receiver of a quadrature-modulated signal must share a clock or otherwise send a clock signal. If the clock phases drift apart, the demodulated I and Q signals bleed into each other, yielding crosstalk. In this context, the clock signal is called a "phase reference".

7. GPOPS-II - Wikipedia

   en.wikipedia.org/wiki/GPOPS-II

   GPOPS-II (pronounced "GPOPS 2") is a general-purpose MATLAB software for solving continuous optimal control problems using hp-adaptive Gaussian quadrature collocation and sparse nonlinear programming.