Question regarding 16 QAM digital modulation

1. How many phases are there in 16-QAM?
2. What is the bandwidth of 16-QAM?
3. Why 16-QAM is better than 16 PSK?
4. Why is QAM considered the most commonly used digital modulation technique?

How many phases are there in 16-QAM?

A Constellation diagram is used to plot those symbols in rectangular space. The 16-QAM design has 4 amplitudes and 12 phases.

What is the bandwidth of 16-QAM?

In high-capacity digital radio systems, 16 QAM is now in very wide use, e.g. for transmitting a 140 (or 135) Mbits/s data rate in interleaved frequency arrange- ments with 40 MHz spacing between two adjacent cross- polarized carriers.

Why 16-QAM is better than 16 PSK?

The constellation diagram of QAM shows that the distance between each combination is constant for any order. PSK has a smaller distance; thus, it is very rational for QAM to perform better than PSK for the higher-order as 16-QAM, 64-QAM, and 256-QAM.

Why is QAM considered the most commonly used digital modulation technique?

This is because it offers a highly effective form of modulation for data when used in anything from mobile phones to Wi-Fi. QAM is found in most forms of high-speed data transmission. Analog QAM also enables carriers to transmit multiple analog signals.