### Highlights fromDiscrete Multitone Modulation Simulation

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# Discrete Multitone Modulation Simulation

22 Dec 2005 (Updated 27 Dec 2005)

A script with a strip down version of a DMT Adsl system.

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The following is a simulation of the DMT system, similar to implementation as done in ADSL systems. The bandwidth has been divided into 32 sub-channels of equal width. Each sub-channel has been allocated bits in the range of 1-15 bits/symbol/Hz.

In a finite length DMT system, the effective length of the channel impulse response, ?V? will cause inter-block interference. To counter the effects of ISI, cyclic prefix is applied to the modulated block after a parallel to serial conversion. The length of cyclic prefix will be the same as ?V?. In this simulation a cyclic prefix of length 5 has been used.

The simulation is performed with three channel responses 1) an ideal channel 2) channel with effective length ?V+1? and 3) channel with effective length greater than ?V+1?. In all cases the channel is modeled as a low pass FIR filter with varying magnitude with frequency.

MATLAB release MATLAB 6.0 (R12)
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27 Nov 2012

very good

05 Feb 2010

i am doing a DMT project.i am struc with demux.anyone know about that?????????

28 Jan 2010

Hi,
I have a project DMT which realizes at MATLAB Simulink.İs there anyone deal with that ??

01 May 2009

i take back my question...i did not notice you were adding complex conjugate part

01 May 2009

i would like to know why you take the ifft for 2*N points. I think it should work even if you have N point IFFT.

22 May 2008
09 Nov 2007

I had the problem in line 114.

09 May 2007

hola, aun no reviso el codigo, pero se ve bien.. Y ademas es un punto de partida muy bueno para investigaciones futuras. From Venezuela

01 May 2007

ur function figure,freqz(h) at line 114 dosnt wrk it says it is an invalid funtion .... i found out dat freqz takes more arguments then u hav given to it ... i am at the moment wrkin on da sme project an havin a hell of a bad time doing it mate ....if u can plzz help

14 Feb 2007
07 Jan 2007

i am comonucation engineer in tishreen univircity

26 Sep 2006
26 Sep 2006
26 Sep 2006

Really Good

19 Jun 2006

good

09 Jun 2006
31 May 2006