How do you do QAM modulation in Matlab?

Modulate Data Using QAM Modulate the data using the qammod function. y = qammod(x,M); Display the modulated signal constellation using the scatterplot function. Set the modulation order to 256, and display the scatter plot of the modulated signal.

How do you make a QAM signal?

The basic way in which a QAM signal can be generated is to generate two signals that are 90° out of phase with each other and then sum them.

How do you demodulate a signal in Matlab?

Description. x = demod( y , fc , fs , method ) demodulates the real carrier signal y with a carrier frequency fc and sample rate fs using the method specified in method . x = demod( y , fc , fs , method , opt ) demodulates the real carrier signal y using the additional options specified in opt .

What QAM 16?

16 Quadrature Amplitude Modulation. This is a modulation technique in which the carrier can exist in one of sixteen different states. As such, each state can represent four bits – 0000 through to 1111, per symbol change.

How does QAM demodulator work?

The QAM demodulator is very much the reverse of the QAM modulator. The signals enter the system, they are split and each side is applied to a mixer. One half has the in-phase local oscillator applied and the other half has the quadrature oscillator signal applied.

How many carrier frequencies are used in QAM?

two carriers
QAM uses two carriers having an identical frequency but which are 90° out of phase with each other. Thus QAM is a combination of phase and amplitude modulation. The mathematics that explain the advantages of QAM get to be quite involved.

What is QAM mapping?

QAM is both an analog and a digital modulation scheme. It conveys two analog message signals, or two digital bit streams, by changing (modulating) the amplitudes of two carrier waves, using the amplitude-shift keying (ASK) digital modulation scheme or amplitude modulation (AM) analog modulation scheme.

How does FM demod work in Matlab?

z = fmdemod( y , Fc , Fs , freqdev ) returns a demodulated signal z , given the input frequency modulated (FM) signal y , where the carrier signal has frequency Fc and sampling rate Fs . freqdev is the frequency deviation of the modulated signal. The value of Fs must satisfy Fs ≥ 2 Fc .