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QPSK modulation system with recover loops

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14 Apr 2006 (Updated )

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

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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)
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Comments and Ratings (13)
05 Jun 2014 Meisam

Thanks,I needed it.

07 Jun 2012 Onur

Why cannot I see anything?

25 Mar 2011 Rum Chang

I see nothing except the definition, what is wrong?

25 Mar 2011 Rum Chang

How to download?

06 May 2008 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

21 Feb 2008 shahid siddique

good

29 May 2007 basel rih  
11 Apr 2007 gaurav ratra

good

08 Mar 2007 ahmad rafiq

nice

10 Jul 2006 Fainan Hanif  
30 May 2006 mohammad turkman

block QPSK

23 May 2006 Herve BOEGLEN

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

18 Apr 2006 Robert Morelos-Zaragoza

Change the summary:

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

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