ifft_cp.m

ofdm.m为主程序

function s_ifft_symbol=ifft_cp(inp_symbol,num_subc,guard_interval,totalnum)

ifft_symbol=ifft(inp_symbol,num_subc);
a=length(ifft_symbol)
if(guard_interval>length(ifft_symbol))
    error('The guard interval is greater than the ofdm symbol duration')
end

[m,n]=size(ifft_symbol)
s_ifft_symbol=reshape(ifft_symbol,1,m*n);%并串转换
ofdm_symbol1=[1];
for i=1:1:totalnum/(2*num_subc)
    s_ifft_symbol_i=s_ifft_symbol((i-1)*num_subc+1:i*num_subc);
    guard_symbol_i=s_ifft_symbol_i(end-guard_interval+1:end);
    
    %guard_symbol=s_ifft_symbol(end-guard_interval+1:end)%求CP
    ofdm_symbol_i=[guard_symbol_i s_ifft_symbol_i];
    ofdm_symbol1=[ofdm_symbol1 ofdm_symbol_i];
%http://bbs.flycomm.com.cn/viewthread.php?tid=18144

end
s_ifft_symbol=ofdm_symbol1(2:(totalnum/2+totalnum/(2*num_subc)*guard_interval+1));