Timing recovery is a critical aspect of Digital Communications Receivers. This model uses a fractional sample delay implemented with a Farrow filter to create a symbol rate timing recovery subsystem. This is combined with a decision aided Carrier Recovery PLL. For testing, a transmitter with continuosly variable carrier frequency error and symbol rate error is included. Two versions of the transmitter are provided. One version uses Simulink's variable step solver to create a continuous time signal for re-sampling by the receiver. The other version uses the same fractional sample delay as in the receiver to implement the transmitter entirely in discrete time.
The updated version of these files supports QAM modulation of order 2 to 256 inclusive. It therefore supports PSK (2 QAM) and QPSK (4 QAM) as well.
References are cited in the models.
Dick Benson (2023). Carrier & Symbol Timing Recovery for N QAM (https://www.mathworks.com/matlabcentral/fileexchange/6742-carrier-symbol-timing-recovery-for-n-qam), MATLAB Central File Exchange. 검색됨 .
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Updated for R2014b.
Models updated for compliance with changes in R2013B.
This update generalizes the previous QPSK models to support N QAM, QPSK being a subset of N QAM. It is also compliant with R2012a,R2012b,R2013a.
Updated for R2009B
New discrete time TX model added and files updated for r2007b and are compatible with 2008a and 2008b as well.