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How many different symbols are possible at the output of a 16-QAM modulator?
As there are 16 symbols, this version of QAM is called 16-QAM. Figure 1.8 Constellation diagram for 16-QAM.
What is the symbol rate of 16-QAM?
four bits per symbol
16 QAM has four bits per symbol for each polarization, so to encode our 12 bits, we could break them up into three groups of four, thereby only using 3 symbols in one polarization.
Which system uses QAM?
Explanation: Digital microwave relay, dial up modem and etc uses QAM modulation technique.
Is there a constellation diagram of 16 QAM modulation?
Waveforms & Constellation Diagram of 16-QAM Modulation (https://www.mathworks.com/matlabcentral/fileexchange/83798-waveforms-constellation-diagram-of-16-qam-modulation), MATLAB Central File Exchange. Retrieved July 17, 2021 . You will see updates in your activity feed.
How to reject a high frequency QAM signal?
Multiply your signal by the 36 KHz carrier (in phase with the signal you used to multiply up; basically the same signal), low pass filter to a reasonable value greater than your modulation rate (2x or more would be fool=proof) but sufficient to reject the high frequency signal at 2×36 KHz. The resulting signal will be your original QAM modulation.
How to analyze the waveform I generated using MATLAB?
Okay I’m really confused about analyzing the waveform I generated using 16-QAM on MATLAB… I transmitted a y = [ 0 1 2 3 4 … 15] discrete signal (in order) to qammod function in MATLAB usign 16-QAM. Its constellation diagram is the standard 16 symbols on the combination of values of − 3, − 1, 1, 3 on Q and I.
What should you expect from a 16QAM constellation?
You should expect to see the signal moving through your 16QAM constellation points with a trajectory that depended on the pulse shaping filter used. Alternatively you could also look at the real and imaginary separately in an eye diagram. Here are some plots I have showing that may help illustrate the different cases: