QPSK modulation system with recover loops

A model to simulate carrier and timinf recovery loops in a QPSK modulation system.

Description

This is a model of a QPSK modulation system for transmission over a bandpass channel with fc = 100 Hz and B = 30 Hz and AWGN at the receiver. SRRC filters with excess bandwidth α = 0.18 are employed. The receiver includes an NDA timing recovery loop followed by a DD phase recovery loop. The transmitter?s symbol period is T and set to a value of 100 ms. The symbol period at the receiver is Tr. The model will produce six windows: Two constellation plots and two eye diagrams (for the real part only), at the output of the matched filters and after the recovery loops; a plot of the phase error (output of the NCO) and a plot of the fractional timing error (used in the interpolator). The frequency offset at the receiver is denoted by deltaf. The model simulates the transmission of 8000 QPSK symbols.

• Required Products: Communications Blockset
• MATLAB release: MATLAB 7.0.1 (R14SP1)

[Robert Morelos-Zaragoza]

Change the summary:

A model to simulate carrier and timing recovery loops in a QPSK modulation system.

[Herve BOEGLEN]

Implements a NDA timing recovery loop (Farrow interpolator) and a DD phase recovery loop for QPSK.
Very useful, thank you !

[mohammad turkman]

 block QPSK

[Fainan Hanif]

 

[ahmad rafiq]

nice

[gaurav ratra]

good

[basel rih]

 

[shahid siddique]

good

[nouri naziha]

salut est ce qu'il ya tester la performance de ce model cad la mesure de BER en fonction de SNR merci de me repondre

[Rum Chang]

How to download?

[Rum Chang]

I see nothing except the definition, what is wrong?