StarQAM (Digital Demod)
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signals are QAM Quadrature Amplitude Modulation signals with the constellation points arranged in concentric circles. has 16 constellation points in two concentric circles. has 32 constellation points in four concentric circles. See the image below for an example of Star-32QAM.
The radii of the outer circles are set as ratios of the inner ring (R1). There are three ring ratios R2 / R1, R3 / R1, and R4 / R1. Each circle contains eight symbol states.
Reliable Carrier Lock
This table shows the minimum and frequency offset values for reliable carrier lock for StarQAM signals:
|
Digital Modulation Format |
Minimum Result Length (0 Hz frequency offset) |
Maximum frequency offset (Result Length = 1000 symbols) |
|---|---|---|
|
Star 16-QAM |
50 symbols |
4.95% symbol rate |
|
Star 32-QAM |
75 symbols |
4.95% symbol rate |
See Also
