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problem to make an ofdm modulation

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itsik
itsik on 10 Jun 2011
hello if i have a 4qam symbols and i want to make ofdm modulation to them is that corect to make that before i make the ifft: symbols=rand (1,1000)
for n =length(symbols)
s=(cos(2*pi*n*t)+j*sin(2*pi*n*t))*symbols
end
thanks!

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Yella
Yella on 14 Jun 2011
Hi I think u want to transmit an ofdm symbol.
Generate random data.('randn'in matlab) Modulate it with QAM('qammod' in matlab) Create a preamble of known data. Create ofdm sysmbols using cyclic prefix method. Form an ofdm frame using preamble and ofdm symbols
Then do ifft and transmit them...that is ofdm modulation..

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itsik
itsik on 14 Jun 2011
how do i do the cyclic prefix method?
thanks!!

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Yella
Yella on 17 Jun 2011
Cyclic prefix is used to eliminate ISI and IBI. Read the link u get to know to how to code 'CP'

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