1.完整项目描述和程序获取
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2.部分仿真图预览
3.算法概述
基于最小二乘（Least Squares, LS）算法的正交频分复用（Orthogonal Frequency Division Multiplexing, OFDM）系统信道估计与均衡是一项关键技术，它在无线通信系统中扮演着重要角色。OFDM结合了QPSK（Quadrature Phase Shift Keying）调制，能够在多径衰落信道中提供高效的频谱利用率和鲁棒性。
4.部分源码
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Errors1=[];
errs=[];
for ij=SNRS
ij
R0 = awgn(T_final,ij,'measured');
%串并变换
R1 = reshape(R0,Len_FFT+Lcp,Symbs).';
%去保护间隔
for k= 1:Symbs
for i=1:Len_FFT
R2(k,i) = R1(k,i+Lcp);
end
end
%FFT
R3 = fft(R2,Len_FFT,2);
R4 = R3(:,Carrs);
%信道估计
R4_signal = R4(:,signal);
R4_pilot = R4(:,pilot);
%信道估计
Hch_LS2 = func_HLS_est(R4_pilot,PN_qpsk3,Symbs,Num_pilot,Num_carr,Step_pilot);
%信道均衡
R_bits = R4_signal./Hch_LS2;
%并串变换
Rec_ps = reshape(R_bits.',1,Len_pilot/Nsamp);
%QPSK解调
Rec_bits = func_deQPSK(Rec_ps);
errs = [errs,length(find(tmps~=Rec_bits))];
end
BER1=errs/Len_pilot;
figure;
semilogy(SNRS,BER1,'-r>',...
'LineWidth',1,...
'MarkerSize',6,...
'MarkerEdgeColor','k',...
'MarkerFaceColor',[0.9,0.9,0.0]);
grid on;
xlabel('SNR');
ylabel('误码率');
legend('OFDM+LS信道估计');
if AMPS==0
save R1_0.mat SNRS BER1
end
if AMPS==0.2
save R1_1.mat SNRS BER1
end
if AMPS==0.5
save R1_2.mat SNRS BER1
end
if AMPS==1
save R1_3.mat SNRS BER1
end
0X_067m
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