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Synchronization and Receiver Design

Carrier frequency and phase recovery, timing frequency and phase recovery, AGC, I/Q imbalance compensation, phase-locked loops

System Objects

comm.AGC Adaptively adjust gain for constant signal-level output
comm.CarrierSynchronizer Compensate for carrier frequency offset
comm.SymbolSynchronizer Correct symbol timing clock skew
comm.PreambleDetector Detect preamble in data
comm.CoarseFrequencyCompensator Compensate for frequency offset for PAM, PSK, or QAM
comm.IQImbalanceCompensator Compensate for I/Q imbalance
comm.PSKCoarseFrequencyEstimator Estimate frequency offset for PSK signal
comm.QAMCoarseFrequencyEstimator Estimate frequency offset for QAM signal
comm.DiscreteTimeVCO Generate variable frequency sinusoid
comm.GMSKTimingSynchronizer Recover symbol timing phase using fourth-order nonlinearity method
comm.MSKTimingSynchronizer Recover symbol timing phase using fourth-order nonlinearity method

Blocks

AGC Adaptively adjust gain for constant signal-level output
Carrier Synchronizer Compensate for carrier frequency offset
Symbol Synchronizer Correct symbol timing clock skew
Preamble Detector Detect preamble in data
Coarse Frequency Compensator Compensate for carrier frequency offset for PAM, PSK, or QAM
I/Q Compensator Coefficient to Imbalance Convert compensator coefficient into amplitude and phase imbalance
I/Q Imbalance Compensator Compensate for imbalance between in-phase and quadrature components
I/Q Imbalance to Compensator Coefficient Converts amplitude and phase imbalance into I/Q compensator coefficient
Discrete-Time VCO Implement voltage-controlled oscillator in discrete time
MSK-Type Signal Timing Recovery Recover symbol timing phase using fourth-order nonlinearity method
Baseband PLL Implement baseband phase-locked loop
Charge Pump PLL Implement charge pump phase-locked loop using digital phase detector
Continuous-Time VCO Implement voltage-controlled oscillator
Linearized Baseband PLL Implement linearized version of baseband phase-locked loop
Phase-Locked Loop Implement phase-locked loop to recover phase of input signal

Functions

iqcoef2imbal Convert compensator coefficient to amplitude and phase imbalance
iqimbal2coef Convert I/Q imbalance to compensator coefficient

Concepts

Phase-Locked Loops

Phase recovery methods and phase-locked loops

Examples and How To

MATLAB

Correct Frequency Offset QAM Using Coarse and Fine Synchronization

Correct phase and frequency offsets for a QAM signal in an AWGN channel.

Adjust Carrier Synchronizer Damping Factor to Correct Frequency Offset

Attempt to correct for a frequency offset using the carrier synchronizer object.

MSK Signal Recovery

This example shows how to model channel impairments such as timing phase offset, carrier frequency offset, and carrier phase offset for a minimum shift keying (MSK) signal.

Simulink

Fractional-N Frequency Synthesis

This model shows how to simulate a phase-locked fractional-N frequency synthesizer.

MSK Signal Recovery

This model shows how channel impairments such as timing phase offset, carrier frequency offset, and phase offset for a minimum shift keying (MSK) signal are modeled.

PLL-Based Frequency Synthesis

This model shows how to simulate a phase-locked loop (PLL) frequency synthesizer.

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