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amr_yassin

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04-06-2009 07:01 AM

5,837 Views

Registered:
04-06-2009

OFDM system

Hi everyone

I implementing a simple OFDM system using modules from core generator.So i started with the fft v.5 but i cant understand a lot of thing about this IP core i mean why is there a real input and an imaginary input in matlab the fft just takes a vector as an input and what is scale_sch i couldnt quite understand the descreption from the fft documentation so if someone can elaborate it

i know these questions might sound stupid but i am not very familiar with dsp

and if someone knows a working examplein order to test the core

amralaa87@hotmail.com

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chenhongyi123

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05-08-2009 06:27 AM

5,555 Views

Registered:
01-05-2009

implementing a simple OFDM system using modules from core generator.So i started with the fft v.5 but i cant understand a lot of thing about this IP core i mean why is there a real input and an imaginary input in matlab the fft just takes a vector as an input and what is scale_sch i couldnt quite understand the descreption from the fft documentation so if someone can elaborate it

i know these questions might sound stupid but i am not very familiar with dsp

and if someone knows a working examplein order to test the core

in fact no complex signal, in your OFDM system, at the IFFT , realpart=your input signal, imagpart =0. After FFT, realpart=your signal, imagpart =0.

scale_sch :

1/N

[10 10... 10] for Radix-4 or Pipelined architecture when N is a

power of 4. **for example , a Radix-4, 256 points , scale_sch <= "10101010" at the IFFT, at the FFT set scale_sch <= "00000000"**[01 10... 10] for Radix-4 or Pipelined architecture when N is not

a power of 4.

[01 01... 01] for Radix-2 or Radix-2-Lite

amr_yassin

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05-15-2009 12:41 PM

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Registered:
04-06-2009