How much dots of the constellation diagram of 16-QAM has?
Discussion Forum
| Que. | The constellation diagram of 16-QAM has ______ dots. |
|---|---|
| b. | 16 |
| c. | 8 |
| d. | none of the above |
| Answer:16 |
What is constellation diagram of QAM?
A constellation diagram is a representation of a signal modulated by a digital modulation scheme such as quadrature amplitude modulation or phase-shift keying. It displays the signal as a two-dimensional xy-plane scatter diagram in the complex plane at symbol sampling instants.
How many different symbols are possible at the output of a 16 QAM modulator?
Each dot in Figure 1.8 is a symbol, as it represents a unique combination of amplitude and phase of the I and Q waves. So, in each symbol period, only one of the ‘dots’ is transmitted. As there are 16 symbols, this version of QAM is called 16-QAM. Figure 1.8 Constellation diagram for 16-QAM.
What is the difference between 16 QAM and 64 QAM?
The 16 qam bits per symbol are 4 (four). This means in 16-QAM each symbol represents 4 bits as mentioned in the 16-QAM constellation diagram above. The 64 qam bits per symbol are 6 (six). In 64-QAM, each symbol is represented by 6 bits as shown in the 64-QAM constellation diagram above.
What is a QAM symbol?
The term “symbol” means some unique combination of phase and amplitude. The term M as in M-QAM indicates how many bits are transmitted per time interval or symbol for each unique amplitude/phase combination. The simplest form of QAM is 2-QAM, more commonly called QPSK or quadrature phase shift keying.
What is a constellation diagram how it is used with PSK?
Constellation diagram (phase-shift diagram) is a graphic representation of a digitally modulated signal consisting of the constellation points used to assess the quality of a transmitted signal. Apart from usable data, the modulated and transmitted signal also includes interferences, noise, and disturbances.