Application Note AN-005: Understanding Constellation ...

NuWaves Engineering 132 Edison Drive Middletown, Ohio 45044-3269 (513) 360-0800 FAX (513) 539-8782 Rev 190703 Application Note AN-005: Understanding Constellation Diagrams and How They Are Used Introduction Constellation diagrams are an important tool in an engineer s arsenal when determining whether or not a digitally modulated radio-frequency (RF) signal is behaving correctly, and troubleshooting the underlying issues when it is not. However, before delving into Constellation diagrams and how they are used, it is important to understand the fundamentals behind digital modulation schemes and why they are used. Background on Signals and modulation Types Transmitting data wirelessly from one point to another, while complex in practice, is simple in concept.

90°. Signals in quadrature are orthogonal and do not interfere with one another. Quadrature modulation takes advantage of this principal by combining two signals which are in quadrature for a combined output signal. The advantage of this is that the amplitude and phase of the combined output signal can be modulated independently or

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  Modulation, Amplitude, Quadrature, Quadrature modulation

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