problem to make an ofdm modulation

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itsik
itsik 2011-6-10
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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回答（2 个）

Yella
Yella 2011-6-14
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..
Yella
Yella 2011-6-17
http://en.wikipedia.org/wiki/Cyclic_prefix
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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