Modulation Features of the Toolbox :: Modulation (Communications Toolbox™)

Modulation Features of the Toolbox

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Modulation Techniques Baseband vs. Passband Simulation

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Modulation Techniques

The available methods of modulation depend on whether the input signal is analog or digital. The tables below show the modulation techniques that Communications Toolbox software supports for analog and digital signals, respectively.

Analog Modulation Method	Acronym	Function or Method
Amplitude modulation (suppressed or transmitted carrier)	AM	`ammod`, `amdemod`
Frequency modulation	FM	`fmmod`, `fmdemod`
Phase modulation	PM	`pmmod`, `pmdemod`
Single sideband amplitude modulation	SSB	`ssbmod`, `ssbdemod`

Digital Modulation Method	Acronym	Function or Method
Differential phase shift keying modulation	DPSK	`modulate` method on `modem.dpskmod` object, `demodulate` method on `modem.dpskdemod` object
Frequency shift keying modulation	FSK	`fskmod`, `fskdemod`
General Quadrature amplitude modulation	General QAM	`modulate` method on `modem.genqammod` object, `demodulate` method on `modem.genqamdemod` object
Minimum shift keying modulation	MSK	`modulate` method on `modem.mskmod` object, `demodulate` method on `modem.mskdemod` object
Offset quadrature phase shift keying modulation	OQPSK	`modulate` method on `modem.oqpskmod` object, `demodulate` method on `modem.oqpskdemod` object
Phase shift keying modulation	PSK	`modulate` method on `modem.pskmod` object, `demodulate` method on `modem.pskdemod` object
Pulse amplitude modulation	PAM	`modulate` method on `modem.pammod` object, `demodulate` method on `modem.pamdemod` object
Quadrature amplitude modulation	QAM	`modulate` method on `modem.qammod` object, `demodulate` method on `modem.qamdemod` object

Baseband vs. Passband Simulation

For a given modulation technique, two ways to simulate modulation techniques are called baseband and passband. Baseband simulation, also known as the lowpass equivalent method, requires less computation. This toolbox supports baseband simulation for digital modulation and passband simulation for analog modulation.

Modulation

Modulation Terminology

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