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Calculate or plot ideal signal constellation
symbols = constellation(obj)
constellation(obj)
example
symbols = constellation(obj) returns the numerical values of the constellation.
symbols
obj
constellation(obj) generates a constellation plot for the object.
collapse all
Create a QPSK modulator.
mod = comm.QPSKModulator;
Determine the reference constellation points.
refC = constellation(mod)
refC = 4×1 complex 0.7071 + 0.7071i -0.7071 + 0.7071i -0.7071 - 0.7071i 0.7071 - 0.7071i
Plot the constellation.
constellation(mod)
Create a PSK demodulator having 0 phase offset.
demod = comm.QPSKDemodulator('PhaseOffset',0);
Plot its reference constellation. The constellation method works for both modulator and demodulator objects.
constellation
constellation(demod)
Create a BPSK Modulator System object™ and calculate the reference constellation values.
Create a comm.BPSKModulator System object.
comm.BPSKModulator
h = comm.BPSKModulator;
Calculate and display the reference constellation values by calling the constellation function.
refC = constellation(h)
refC = 2×1 complex 1.0000 + 0.0000i -1.0000 + 0.0000i
Create a PSK modulator.
mod = comm.PSKModulator;
refC = 8×1 complex 0.9239 + 0.3827i 0.3827 + 0.9239i -0.3827 + 0.9239i -0.9239 + 0.3827i -0.9239 - 0.3827i -0.3827 - 0.9239i 0.3827 - 0.9239i 0.9239 - 0.3827i
Create a PSK demodulator having modulation order 16.
demod = comm.PSKDemodulator(16);
Create a BPSK Modulator System object™ and plot the reference constellation.
bpsk = comm.BPSKModulator;
Plot the reference constellation by calling the constellation function.
constellation(bpsk)
Create a BPSK Demodulator System object™ and calculate its reference constellation.
h = comm.BPSKDemodulator;
Calculate and display the reference signal constellation by calling the constellation function.
Create a BPSK Demodulator System object™ and then plot the reference signal constellation.
constellation(h)
System object to return constellation for, specified as a modulator System object.
Data Types: object
object
Constellation points, returned as a complex vector.
Data Types: double | single Complex Number Support: Yes
double
single
comm.BPSKDemodulator
comm.OQPSKModulator
comm.PSKModulator
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