OFDM-zhen-test.txt.rar_OFDM帧_matlab 帧检测_ofdm 帧检测_ofdm 检测_ofdm检测

function [FrameStart]=FrameDetectionTD_OFDMA(NoisedFrame) N=2048; L=round(N/3); %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 1st Frame Buffer_corr=zeros(1,2*L); %Len=length(NoisedFrame); Buffer_sum=zeros(1,2*L); Len=6000; %**************互相关 for k=1:1:Len Buffer_corr(1:2*L-1)=Buffer_corr(2:2*L); Buffer_corr(2*L)=NoisedFrame(k); TempAccu(k)=Buffer_corr(1:L)*Buffer_corr(L+1:2*L)'; Normalization(k)=0.5*sum(abs(Buffer_corr).^2); TempAccu(k)=(abs(TempAccu(k))^2)/Normalization(k); end Accu(1:Len-2*L+1)=TempAccu(2*L:Len); %%%%%%% 减掉由于 Buffer 移位操作对序号位置的影响 %for k=1:1:Len-2*L+1 % Buffer_sum(1:2*L-1)=Buffer_sum(2:2*L); % Buffer_sum(2*L)=Accu(k); % TempAccusum(k)=sum(Buffer_sum); %end %Accusum(1:Len-4*L+2)=TempAccusum(2*L:Len-2*L+1); %%%%%%% 减掉由于 Buffer 移位操作对序号位置的影响 for k=1:1:Len-2*L+1-1200+1 Accusum(k)=sum(Accu(k:k+1200-1)); end %%%%%%% 输出的峰值位置对应一个 Short Preamble 的最后一个码片 figure; plot(abs(TempAccu),'b'); figure; plot(abs(Accu),'b'); figure; %plot(abs(TempAccusum),'b'); figure; plot(abs(Accusum),'b'); %[max,index]=max(abs(TempAccusum)) [max,index1]=max(abs(Accusum)) FrameStart=index1