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比较完整的OFDM仿真，供大家学习下载。、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、%main_OFDM.m%一个相对完整的OFDM通信系统的仿真设计，包括编码，调制，IFFT，%上下变频，高斯信道建模，FFT，PAPR抑制，各种同步，解调和解码等模%块，并统括系统性能的仿真验证了系统设计的可靠性。clearallcloseallclc%++++++++++++++++++++++++++全局变量++++++++++++++++++++++++++++++%seq_num表示当前帧是第几帧%count_dds_up上变频处的控制字的累加%count_dds_down下变频处的控制字的累加（整整）%count_dds_down_tmp下变频处的控制字的累加（小数）%dingshi定时同步的定位%m_syn记录定时同步中的自相关平台globalseq_numglobalcount_dds_upglobalcount_dds_downglobalcount_dds_down_tmpglobaldingshiglobalm_syn%+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%SNR_Pre设定用于仿真的信噪比的初值%interval_SNR设定用于仿真的信噪比间隔%frame_num每一个信噪比下仿真的数据帧数%err_int_final用于计算每帧出现的误比特数%fwc_down设定的接收机初始载波频率控制字%fre_offset设定接收机初始载波频率偏移调整量（单位为Hz）%k0每次进入卷积编码器的信息比特数%G卷积编码的生成矩阵SNR_Pre=-5;interval_SNR=1;forSNR_System=SNR_Pre:interval_SNR:5frame_num=152;dingshi=250;err_int_final=0;fwc_down=16.050;fre_offset=0;k0=1;G=[1011011;1111001];disp('--------------start-------------------');forseq_num=1:frame_num,%frame_num帧数%+++++++++++++++++++++++以下为输入数据部分+++++++++++++++++++++++datain=randint(1,90);%+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%++++++++++++++++++++++以下为信道卷积编码部分+++++++++++++++++++++encodeDATA=cnv_encd(G,k0,datain);%+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%+++++++++++++++++++++++++++信道交织编码+++++++++++++++++++++++++interlacedata=interlacecode(encodeDATA,8,24);%+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%+++++++++++++++++++++++++以下为QPSK调制部分+++++++++++++++++++++QPSKdata=qpsk(interlacedata);%+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%+++++++++++++++++++++++++++生成训练序列+++++++++++++++++++++++++ifseq_num3trainsp_temp=seq_train();end%+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%++++++++++++++++++++++++++++插入导频++++++++++++++++++++++++++++PILOT=(1+j);m_QPSKdata=QPSKdata;data2fft_temp=[m_QPSKdata(1:8),PILOT,m_QPSKdata(9:16),PILOT,m_QPSKdata(17:24),PILOT,m_QPSKdata(25:32),PILOT,m_QPSKdata(33:40),PILOT,m_QPSKdata(41:48),m_QPSKdata(49:56),PILOT,m_QPSKdata(57:64),PILOT,m_QPSKdata(65:72),PILOT,m_QPSKdata(73:80),PILOT,m_QPSKdata(81:88),PILOT,m_QPSKdata(89:end)];%+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++trainsp_temp2=[trainsp_temp,zeros(1,128)];trainsp=[trainsp_temp2(65:256),trainsp_temp2(1:64)];%++++++++++++++++++++++++++降PAPR矩阵变换++++++++++++++++++++++++matix_data=nyquistimp_PS();matrix_mult=data2fft_temp*matix_data;%+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++data2fft2=[matrix_mult(65:128),zeros(1,128),matrix_mult(1:64)];%++++++++++++++++++++++++++++ifft运算+++++++++++++++++++++++++++ifseq_num==1ifftin=trainsp;elseifseq_num==2ifftin=trainsp;elseifftin=data2fft2;endIFFTdata=fft_my(conj(ifftin)/256);IFFTdata=conj(IFFTdata);%figure%plot(real(IFFTdata))%xlabel('realIFFTdata')%figure%plot(imag(IFFTdata))%xlabel('imagIFFTdata')%+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%+++++++++++++++++++以下为插入循环前后缀，2倍升采样+++++++++++++++data2fir=add_CYC_upsample(IFFTdata,2);%++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%+++++++++++++++++++++++++fir低通滤波++++++++++++++++++++++++++guiyi_a=[0.00172160.0101620.0255120.028801-0.0059219-0.060115-0.04960.0914310.296360.39560.296360.091431-0.0496-0.060115-0.00592190.0288010.0255120.0101620.0017216];%抽样截止频率为128kHZ,通带截止频率为20kHZ，阻带截止频率为40kHZ，带内纹波动小于1dB，带外衰减100dBtxFIRdatai=filter(guiyi_a,1,real(data2fir));txFIRdataq=filter(guiyi_a,1,imag(data2fir));%++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%+++++++++++++++++++++++++发射机cic滤波++++++++++++++++++++++++++CICidatai=cic_inter(txFIRdatai,20);CICidataq=cic_inter(txFIRdataq,20);%+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%+++++++++++++++++++++++++++++上变频++++++++++++++++++++++++++++fwc_up=16;%控制字可以选择DUCdata=up_convert_ofdm(fwc_up,CICidatai,CICidataq);%+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%++++++++++++++++++++++++++高斯白噪声信道++++++++++++++++++++++++[DUCdata,datamax]=guiyi_DUCdata(DUCdata);awgn_data=awgn(DUCdata,SNR_System);%+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%*****************************接受机*****************************%+++++++++++++++++++++++++++++下变频+++++++++++++++++++++++++++++DUCdata_tmp=awgn_data;fwc_down=fwc_down+(fre_offset*128/2560000);r_fre_offset=2560000*((fwc_down-fwc_up)/128);[DDCdatai,DDCdataq]=down_convert_ofdm(fwc_down,DUCdata_tmp);%+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%++++++++++++++++++++++++++接收机cic滤波+++++++++++++++++++++++++CICddatai=cic_deci(DDCdatai,40,40);CICddataq=cic_deci(DDCdataq,40,40);%+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%++++++++++++++++++++++++++++fir低通滤波++++++++++++++++++++++++guiyi_b=[0.019527-0.039340.049055-0.018102-0.10030.59440.5944-0.1003-0.0181020.049055-0.039340.019527];%抽样截止频率为64kHZ,通带截止频率为20kHZ，阻带截止频率为30kHZ，带内纹波动小于1dB，带外衰减60dBrxFIRdatai=filter(guiyi_b,1,CICddatai);rxFIRdataq=filter(guiyi_b,1,CICddataq);%++++++++++++++++++++++++++