Tags: compare, density, everyonei, m-ary, m-pskmodukations, matlab, power, programming, psd, psk, spectral

m-ary psk psd

On Programmer » Matlab

1,789 words with 2 Comments; publish: Wed, 30 Apr 2008 16:46:00 GMT; (20078.13, « »)

hello to everyone!!

i'm trying to compare the Power Spectral Density of different M-psk

modukations (m=2,4,8..)...for that i using the communications

blockset...a random integer source, an Mpsk modulator, a normal

Raised cosine filter and an Bfft scope...the probleem is that every

time i'm getting the same graph result without any difference for

different M.

If u have any idea for what can be the problem please i want to tell

me..

fanzio

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  • 2 Comments
    • "fanzio" <fanzio12.matlab.todaysummary.com.yahoo.co.uk> wrote in message

      news:ef001e1.-1.matlab.todaysummary.com.webx.raydaftYaTP...

      > hello to everyone!!

      > i'm trying to compare the Power Spectral Density of different M-psk

      > modukations (m=2,4,8..)...for that i using the communications

      > blockset...a random integer source, an Mpsk modulator, a normal

      > Raised cosine filter and an Bfft scope...the probleem is that every

      > time i'm getting the same graph result without any difference for

      > different M.

      > If u have any idea for what can be the problem please i want to tell

      > me..

      > fanzio

      Maybe I'm missing something but wouldn't you expect them to be the same?

      #1; Wed, 30 Apr 2008 16:47:00 GMT
    • Ken Davis wrote:

      >

      > "fanzio" <fanzio12.matlab.todaysummary.com.yahoo.co.uk> wrote in message

      > news:ef001e1.-1.matlab.todaysummary.com.webx.raydaftYaTP...

      > M-psk

      > every

      for

      > tell

      > Maybe I'm missing something but wouldn't you expect them to be the

      > same?

      >

      >

      Thank you your reply...

      I would expect to see diference in the spectrum...i think as bigger

      the M as norrower the main lobe..for instance the BPSK spectrum has a

      wider main lobe than QPSK.

      am I rong in that?

      #2; Wed, 30 Apr 2008 16:48:00 GMT