hi all, Generally i have coded my OFDM system, but i have some problem in understanding about the one tap equalizer. Actually i know how to generate a ZF equalizer , but i would like to know how to generate MMSE equalizer, even i have the algorithm , but i dont understand the symbol stand for,hence i cant code in matlab Г=E[||X||]^2 G= [Г^0.5 * conj(H)] / Г||H||^2+ б^2 The question i would like to ask is ,the E stand for what in the system. is it the variance of the X or the mean of the X or the Standard derivation of the X or neither it... I am comfuse on it. Thank you _____________________________________ Do you know a company who employs DSP engineers? Is it already listed at http://dsprelated.com/employers.php ?

# One Tap Equalizer in OFDM

Started by ●April 1, 2007

Reply by ●April 1, 20072007-04-01

On Apr 1, 3:05 am, "ericknightX" <wil...@gmail.com> wrote:> hi all, > > Generally i have coded my OFDM system, but i have some problem in > understanding about the one tap equalizer. > > Actually i know how to generate a ZF equalizer , but i would like to know > how to generate MMSE equalizer, even i have the algorithm , but i dont > understand the symbol stand for,hence i cant code in matlab > > Г=E[||X||]^2 > > G= [Г^0.5 * conj(H)] / Г||H||^2+ б^2 > > The question i would like to ask is ,the E stand for what in the system. > is it the variance of the X or the mean of the X or the Standard > derivation of the X or neither it... > > I am comfuse on it. > > Thank you > > _____________________________________ > Do you know a company who employs DSP engineers? > Is it already listed athttp://dsprelated.com/employers.php?I can't read your characters (please use standard fonts) so I can only guess that E[.] means Expectation (mean). Note that you have E[ ||X||^2 ] which means Expectation of the square norm of X.

Reply by ●April 1, 20072007-04-01

>On Apr 1, 3:05 am, "ericknightX" <wil...@gmail.com> wrote: >> hi all, >> >> Generally i have coded my OFDM system, but i have some problem in >> understanding about the one tap equalizer. >> >> Actually i know how to generate a ZF equalizer , but i would like toknow>> how to generate MMSE equalizer, even i have the algorithm , but i dont >> understand the symbol stand for,hence i cant code in matlab >> >> Г=E[||X||]^2 >> >> G= [Г^0.5 * conj(H)] / Г||H||^2+ б^2 >> >> The question i would like to ask is ,the E stand for what in thesystem.>> is it the variance of the X or the mean of the X or the Standard >> derivation of the X or neither it... >> >> I am comfuse on it. >> >> Thank you >> >> _____________________________________ >> Do you know a company who employs DSP engineers? >> Is it already listed athttp://dsprelated.com/employers.php? > > >I can't read your characters (please use standard fonts) >so I can only guess that E[.] means Expectation (mean). >Note that you have E[ ||X||^2 ] which means Expectation >of the square norm of X. > >erm...actually the main problem is come from r =E[||X||]^2 ,but as u say E[||X||]^2 stand for the expectation of the square norm of x. so in matlab is that show in this way : norm(abs(x).^2) thank you _____________________________________ Do you know a company who employs DSP engineers? Is it already listed at http://dsprelated.com/employers.php ?

Reply by ●February 17, 20082008-02-17

Hi all I don't understand your characters if you could write with normal characters, to use MMSE the equation bellow describe the Equalizer technique W(n)=conj H(n)/|H(n)|^2+1/EbN0 where h is the channel gain. If you have any other query do not hesitate to contact me, and if you need a paper regarding this field i will send it to you. Regards, Z.>On Apr 1, 3:05 am, "ericknightX" <wil...@gmail.com> wrote: >>> hi all, >>> >>> Generally i have coded my OFDM system, but i have some problem in >>> understanding about the one tap equalizer. >>> >>> Actually i know how to generate a ZF equalizer , but i would like to >know >>> how to generate MMSE equalizer, even i have the algorithm , but idont>>> understand the symbol stand for,hence i cant code in matlab >>> >>> Г=E[||X||]^2 >>> >>> G= [Г^0.5 * conj(H)] / Г||H||^2+ б^2 >>> >>> The question i would like to ask is ,the E stand for what in the >system. >>> is it the variance of the X or the mean of the X or the Standard >>> derivation of the X or neither it... >>> >>> I am comfuse on it. >>> >>> Thank you >>> >>> _____________________________________ >>> Do you know a company who employs DSP engineers? >>> Is it already listed athttp://dsprelated.com/employers.php? >> >> >>I can't read your characters (please use standard fonts) >>so I can only guess that E[.] means Expectation (mean). >>Note that you have E[ ||X||^2 ] which means Expectation >>of the square norm of X. >> >> > >erm...actually the main problem is come from r =E[||X||]^2 ,but as u say >E[||X||]^2 stand for the expectation of the square norm of x. so inmatlab>is that show in this way : norm(abs(x).^2) > >thank you > > >_____________________________________ >Do you know a company who employs DSP engineers? >Is it already listed at http://dsprelated.com/employers.php ? >