Modulation

Analog and digital modulation

Modulate and demodulate signal data using digital baseband, analog baseband, and analog passband techniques.

Functions

Digital Baseband Modulation

Amplitude Modulation

`genqammod`	General quadrature amplitude modulation (QAM)
`genqamdemod`	General quadrature amplitude demodulation
`modnorm`	Scaling factor for normalizing modulation output
`pammod`	Pulse amplitude modulation (PAM)
`pamdemod`	Pulse amplitude demodulation
`qammod`	Quadrature amplitude modulation (QAM)
`qamdemod`	Quadrature amplitude demodulation

Amplitude and Phase Modulation

`apskmod`	Amplitude phase shift keying (APSK) modulation
`apskdemod`	Amplitude phase shift keying (APSK) demodulation
`mil188qammod`	MIL-STD-188-110 B/C standard-specific quadrature amplitude modulation (QAM)
`mil188qamdemod`	MIL-STD-188-110 B/C standard-specific quadrature amplitude demodulation

Continuous Phase Modulation

`mskmod`	Minimum shift keying modulation
`mskdemod`	Minimum shift keying demodulation

Frequency Modulation

`fskmod`	Frequency shift keying modulation
`fskdemod`	Frequency shift keying demodulation

OFDM Modulation

`ofdmmod`	Modulate using OFDM method
`ofdmdemod`	Demodulate using OFDM method

Phase Modulation

`dpskmod`	Differential phase shift keying modulation
`dpskdemod`	Differential phase shift keying demodulation
`pskmod`	Modulate signal using M-PSK method
`pskdemod`	Demodulate using M-ary PSK method

Analog Passband Modulation

`ammod`	Amplitude modulation
`amdemod`	Amplitude demodulation
`fmmod`	Frequency modulation
`fmdemod`	Frequency demodulation
`pmmod`	Phase modulation
`pmdemod`	Phase demodulation
`ssbmod`	Single sideband suppressed-carrier amplitude modulation
`ssbdemod`	Single sideband amplitude demodulation

Objects

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Digital Baseband Modulation

Amplitude Modulation

`comm.GeneralQAMModulator`	Modulate using arbitrary QAM constellation
`comm.GeneralQAMDemodulator`	Demodulate using arbitrary QAM constellation

Continuous Phase Modulation

`comm.CPFSKModulator`	Modulate using CPFSK method
`comm.CPFSKDemodulator`	Demodulate using CPFSK method and Viterbi algorithm
`comm.CPMModulator`	Modulate signal using CPM method
`comm.CPMDemodulator`	Demodulate signal using CPM method and Viterbi algorithm
`comm.GMSKModulator`	Modulate using GMSK method
`comm.GMSKDemodulator`	Demodulate GMSK-modulated signal
`comm.MSKModulator`	Modulate using MSK method
`comm.MSKDemodulator`	Demodulate using MSK method and Viterbi algorithm

Frequency Modulation

`comm.FSKModulator`	Modulate using M-ary FSK method
`comm.FSKDemodulator`	Demodulate using M-ary FSK method

OFDM Modulation

`comm.OFDMModulator`	Modulate using OFDM method
`comm.OFDMDemodulator`	Demodulate using OFDM method

Phase Modulation

`comm.DBPSKModulator`	Modulate using DBPSK method
`comm.DBPSKDemodulator`	Demodulate using DBPSK method
`comm.DPSKModulator`	Modulate using M-ary DPSK method
`comm.DPSKDemodulator`	Demodulate using M-ary DPSK method
`comm.DQPSKModulator`	Modulate using DQPSK method
`comm.DQPSKDemodulator`	Demodulate using DQPSK method
`comm.OQPSKModulator`	Modulation using OQPSK method
`comm.OQPSKDemodulator`	Demodulation using OQPSK method
`comm.gpu.PSKModulator`	Modulate signals using M-PSK method with GPU
`comm.gpu.PSKDemodulator`	Demodulate signals using M-ary PSK method with GPU

Trellis-Coded Modulation

`comm.GeneralQAMTCMModulator`	Encode binary data using convolutional encoder and map result to general QAM constellation
`comm.GeneralQAMTCMDemodulator`	Demodulate and decode trellis-coded general quadrature amplitude modulated signal
`comm.PSKTCMModulator`	Encode binary data using convolutional encoder and map result to M-PSK constellation
`comm.PSKTCMDemodulator`	Demodulate and decode trellis-coded M-PSK modulated signal
`comm.RectangularQAMTCMModulator`	Encode binary data using convolutional encoder and map result to rectangular QAM constellation
`comm.RectangularQAMTCMDemodulator`	Demodulate and decode trellis-coded rectangular quadrature amplitude modulated signal

Analog Baseband Modulation

`comm.FMBroadcastModulator`	Modulate broadcast FM audio signal
`comm.FMBroadcastDemodulator`	Demodulate broadcast FM audio signal
`comm.FMModulator`	Modulate signal using FM method
`comm.FMDemodulator`	Demodulate baseband FM signal

Blocks

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Digital Baseband Modulation

Amplitude Modulation

General QAM Modulator Baseband	Modulate using quadrature amplitude modulation
General QAM Demodulator Baseband	Demodulate QAM-modulated data
M-PAM Modulator Baseband	Modulate using M-ary pulse amplitude modulation
M-PAM Demodulator Baseband	Demodulate M-PAM-modulated data
Rectangular QAM Modulator Baseband	Modulate using rectangular quadrature amplitude modulation
Rectangular QAM Demodulator Baseband	Demodulate rectangular-QAM-modulated data

Amplitude and Phase Modulation

M-APSK Modulator Baseband	M-ary amplitude phase shift keying (APSK) modulation
M-APSK Demodulator Baseband	M-ary amplitude phase shift keying (APSK) demodulation
MIL-188 QAM Modulator Baseband	MIL-STD-188-110 B/C standard-specific quadrature amplitude modulation (QAM)
MIL-188 QAM Demodulator Baseband	MIL-STD-188-110 B/C standard-specific quadrature amplitude demodulation

Continuous Phase Modulation

CPFSK Modulator Baseband	Modulate using continuous phase frequency shift keying method
CPFSK Demodulator Baseband	Demodulate CPFSK-modulated data
CPM Modulator Baseband	Modulate signal using CPM method
CPM Demodulator Baseband	Demodulate signal using CPM method and Viterbi algorithm
GMSK Modulator Baseband	Modulate using Gaussian minimum shift keying method
GMSK Demodulator Baseband	Demodulate GMSK-modulated data
MSK Modulator Baseband	Modulate using differentially encoded minimum shift keying method
MSK Demodulator Baseband	Demodulate differentially encoded MSK-modulated data

Frequency Modulation

M-FSK Modulator Baseband	Modulate using M-ary frequency shift keying method
M-FSK Demodulator Baseband	Demodulate FSK-modulated data

OFDM Modulation

OFDM Modulator Baseband	Modulate using OFDM method
OFDM Demodulator Baseband	Demodulate using OFDM method

Phase Modulation

BPSK Modulator Baseband	Modulate using BPSK method
BPSK Demodulator Baseband	Demodulate BPSK-modulated data
DBPSK Modulator Baseband	Modulate using differential binary phase shift keying method
DBPSK Demodulator Baseband	Demodulate DBPSK-modulated data
DQPSK Modulator Baseband	Modulate using differential quadrature phase shift keying method
DQPSK Demodulator Baseband	Demodulate DQPSK-modulated data
M-DPSK Modulator Baseband	Modulate using M-ary differential phase shift keying method
M-DPSK Demodulator Baseband	Demodulate DPSK-modulated data
M-PSK Modulator Baseband	Modulate using M-ary phase shift keying
M-PSK Demodulator Baseband	Demodulate PSK-modulated data
OQPSK Modulator Baseband	Modulate using OQPSK method
OQPSK Demodulator Baseband	Demodulation using OQPSK method
QPSK Modulator Baseband	Modulate using quadrature phase shift keying method
QPSK Demodulator Baseband	Demodulate QPSK-modulated data

Trellis-Coded Modulation

General TCM Encoder	Convolutionally encode binary data and map using arbitrary constellation
General TCM Decoder	Decode trellis-coded modulation data, mapped using arbitrary constellation
M-PSK TCM Encoder	Convolutionally encode binary data and modulate using PSK method
M-PSK TCM Decoder	Decode trellis-coded modulation data, modulated using PSK method
Rectangular QAM TCM Encoder	Convolutionally encode binary data and modulate using QAM method
Rectangular QAM TCM Decoder	Decode trellis-coded modulation data, modulated using QAM method

Utilities

Bipolar to Unipolar Converter	Map bipolar signal to unipolar signal in range [0, M – 1]
Unipolar to Bipolar Converter	Map unipolar signal in range [0, M – 1] to bipolar signal
Data Mapper	Map integer symbols from one coding scheme to another
Bit to Integer Converter	Map vector of bits to corresponding vector of integers
Integer to Bit Converter	Map vector of integers to vector of bits

Analog Baseband Modulation

FM Broadcast Modulator Baseband	Modulate using broadcast FM method
FM Broadcast Demodulator Baseband	Demodulate broadcast FM-modulated signal
FM Modulator Baseband	Modulate using FM method
FM Demodulator Baseband	Demodulate using FM method

Analog Passband Modulation

DSB AM Modulator Passband	Modulate using double-sideband amplitude modulation
DSB AM Demodulator Passband	Demodulate DSB-AM-modulated data
DSBSC AM Modulator Passband	Modulate using double-sideband suppressed-carrier amplitude modulation
DSBSC AM Demodulator Passband	Demodulate DSBSC-AM-modulated data
FM Modulator Passband	Modulate using frequency modulation
FM Demodulator Passband	Demodulate FM-modulated data
PM Modulator Passband	Modulate using phase modulation
PM Demodulator Passband	Demodulate PM-modulated data
SSB AM Modulator Passband	Modulate using single-sideband amplitude modulation
SSB AM Demodulator Passband	Demodulate SSB-AM-modulated data

Topics

Modulation

What Is Modulation?
Define modulation in wireless communication systems.

Digital Modulation

Digital Baseband Modulation

Modulating using digital methods.
- Amplitude Modulation
- Amplitude and Phase Modulation
- Continuous-Phase Modulation
- Frequency Modulation
- Orthogonal Frequency Division Multiplexing Modulation
- Phase Modulation
- Trellis-Coded Modulation
OFDM Modulation Using MATLAB

Orthogonal Frequency Division Multiplexing (OFDM) is the multicarrier digital modulation technique used by modern wireless communications systems such as 5G and LTE cellular, and WiFi.
- STEP 1: Introduction to OFDM
- STEP 2: Basic OFDM with No Cyclic Prefix
- STEP 3: Equalization, Convolution, and Cyclic Prefix Addition
- STEP 4: OFDM and Equalization with Prepended Cyclic Prefix
- STEP 5: OFDM with FFT Based Oversampling

Analog Modulation

Analog Passband Modulation
Modulating using analog passband methods.
Analog Baseband Modulation
Modulating using analog baseband methods.

Featured Examples

OTFS Modulation

Simulate an OTFS communication link in a high-speed mobile environment.

Since R2024a
Open Live Script

Modulation Classification with Deep Learning

Use a convolutional neural network (CNN) for modulation classification.

Since R2020b
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SC-FDMA vs. OFDM Modulation

Compare OFDM with SC-FDMA highlighting the merits of the SC-FDMA modulation scheme as used in LTE and 5G communication systems.

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Compare Filter Bank Multi-Carrier (FBMC) with Orthogonal Frequency Division Multiplexing (OFDM) and highlight the merits of the candidate modulation scheme for Fifth Generation (5G) communication systems.

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F-OFDM vs. OFDM Modulation

Compare Orthogonal Frequency Division Multiplexing (OFDM) with Filtered-OFDM (F-OFDM) and highlight the merits of the candidate modulation scheme for Fifth Generation (5G) communication systems.

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UFMC vs. OFDM Modulation

Compares Universal Filtered Multi-Carrier (UFMC) with Orthogonal Frequency Division Multiplexing (OFDM) and highlight the merits of the candidate modulation scheme for Fifth Generation (5G) communication systems.

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Passband Modulation

Simulate passband modulation by multiplying a modulated complex signal with a complex sine wave to perform frequency upconversion.

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Training and Testing a Neural Network for LLR Estimation

Generate signals and channel impairments to train a neural network, called LLRNet, to estimate exact log likelihood ratios (LLR).

Since R2020b
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Log-Likelihood Ratio (LLR) Demodulation

BER performance improvement for QPSK modulation when using log-likelihood ratio (LLR) instead of hard-decision demodulation in a convolutionally coded communication link.

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Concatenated OSTBC with TCM

Simulate orthogonal space-time block code concatenated with trellis-coded modulation for information transmission over a 2-by-1 MIMO channel.

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Concatenated OSTBC with TCM in Simulink

Model orthogonal space-time block code concatenated with trellis-coded modulation for information transmission over a 2-by-1 MIMO channel in Simulink^®.

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LLR vs. Hard Decision Demodulation in Simulink

Improve BER performance by using log-likelihood ratio (LLR) instead of hard decision demodulation in a convolutionally coded communication link.

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OFDM Transmitter and Receiver

Simulate an end-to-end OFDM transmission system for a single-input, single-output (SISO) channel.

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