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Channel Modeling and RF Impairments

AWGN, Rayleigh, Rician, WINNER II, MIMO, phase noise, frequency offset, nonlinearities

Communications System Toolbox™ enables you to model and visualize noisy SISO and MIMO channels having Rayleigh, Rician, or WINNER II fading profiles. Multiple Doppler spectrum shapes are available. In addition, you can model RF impairments arising from actual hardware implementation.

System Objects

comm.AWGNChannel Add white Gaussian noise to input signal
comm.RayleighChannel Filter input signal through a Rayleigh multipath fading channel
comm.RicianChannel Filter input signal through a Rician fading channel
comm.MIMOChannel Filter input signal through MIMO multipath fading channel
comm.LTEMIMOChannel Filter input signal through LTE MIMO multipath fading channel
comm.WINNER2Channel Filter input signal through WINNER II fading channel
comm.BinarySymmetricChannel Introduce binary errors
comm.gpu.AWGNChannel Add white Gaussian noise to input signal with GPU
comm.MemorylessNonlinearity Apply memoryless nonlinearity to input signal
comm.PhaseFrequencyOffset Apply phase and frequency offsets to input signal
comm.PhaseNoise Apply phase noise to complex, baseband signal
comm.ThermalNoise Add thermal noise to signal

Blocks

AWGN Channel Add white Gaussian noise to input signal
Multipath Rayleigh Fading Channel Simulate multipath Rayleigh fading propagation channel
Multipath Rician Fading Channel Simulate multipath Rician fading propagation channel
MIMO Channel Filter input signal through MIMO multipath fading channel
Binary Symmetric Channel Introduce binary errors
I/Q Imbalance Create complex baseband model of signal impairments caused by imbalances between in-phase and quadrature receiver components
Memoryless Nonlinearity Apply memoryless nonlinearity to complex baseband signal
Phase/Frequency Offset Apply phase and frequency offsets to complex baseband signal
Phase Noise Apply receiver phase noise to complex baseband signal
Free Space Path Loss Reduce amplitude of input signal by amount specified
Receiver Thermal Noise Apply receiver thermal noise to complex baseband signal
Complex Phase Difference Output phase difference between two complex input signals
Complex Phase Shift Shift phase of complex input signal by second input value

Functions

awgn Add white Gaussian noise to signal
iqimbal Apply I/Q imbalance to input signal
bsc Model binary symmetric channel
filter Filter signal with channel object
rayleighchan Construct Rayleigh fading channel object
ricianchan Construct Rician fading channel object
stdchan Construct channel object from set of standardized channel models
legacychannelsim Toggles random number generation mode for channel objects
reset Reset channel object
winner2.AntennaArray Create antenna array
winner2.dipole Calculate field pattern of half-wavelength dipole
winner2.layoutparset WINNER II layout parameter configuration
winner2.wim Generate channel coefficients using WINNER II channel model
winner2.wimparset WINNER II model parameter configuration
doppler Construct Doppler spectrum structure
doppler.ajakes Construct asymmetrical Doppler spectrum object
doppler.bell Construct bell-shaped Doppler spectrum object
doppler.bigaussian Construct bi-Gaussian Doppler spectrum object
doppler.flat Construct flat Doppler spectrum object
doppler.gaussian Construct Gaussian Doppler spectrum object
doppler.jakes Construct Jakes Doppler spectrum object
doppler.rjakes Construct restricted Jakes Doppler spectrum object
doppler.rounded Construct rounded Doppler spectrum object
plot (channel) Plot channel characteristics with channel visualization tool
plotPhaseNoiseFilter Plot response of phase noise filter block

Topics

Channel Modeling

AWGN Channel

Model channel and RF impairment characteristics

Configure Eb/No for AWGN Channels with Coding

This example shows how to set the bit energy to noise density ratio (Eb/No) for communication links employing channel coding.

Fading Channels

Defining a fading channel object and applying it to a signal

Visualize Effects of Frequency-Selective Fading

Pass FSK and QPSK signals through a Rayleigh multipath fading channel.

MIMO Channel

Multipath MIMO fading channels allow for design of communication systems with multiple antenna elements at the transmitter and receiver

WINNER II Channel

Modeling WINNER II channel using the WINNER II Channel Model for Communications System Toolbox add-on

Impairments

RF Impairments

Modeling impairments to a baseband signal caused by the radio frequency components

Visualize RF Impairments

Apply various RF impairments to a QAM signal.

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