function [s_out] = ofdm_demod_neq(s_in)
%% ofdm 解調(diào)
%% 輸入為二進(jìn)制序列

global ifft_len;
global CP_len;
global bitPerSymbol;
global symbolPerCarrier;
global carriers;
global s_len;
% 接收 ，進(jìn)行串并轉(zhuǎn)換
P_S = reshape(s_in, ifft_len+CP_len, symbolPerCarrier);

%去CP
PDeCP = P_S(1+CP_len:ifft_len+CP_len,:);
% fft
P_FFT = fft(PDeCP);
P_FFT2 = P_FFT(carriers,:);

% %% 畫星座圖
%  figure(66);
%  Tmp = reshape(P_FFT2,1,[]);
%  plot(real(Tmp),imag(Tmp),'.');
%  title('接收端星座圖');axis([-4 4 -4 4]);

SQam = Qam4_demod(P_FFT2);
% 并串轉(zhuǎn)換
s_out = reshape(SQam,1,s_len);