OFDM MATLAB 仿真程序.doc

echo off;clear all;close all;clc; fprintf( 'OFDM 仿真\n') ; tic %--------------------------------------------- % %参数定义% %--------------------------------------------- % %Initialize the parameters NumLoop =1000; NumSubc =128; NumCP =8; SyncDelay =0; %子载波数 128 %位数/符号 2 %符号数/载波 1000 %训练符号数 0 %循环前缀长度 8(1/16)*T %调制方式 4-QAM %多径信道数 3 %IFFT Size 128 %信道最大时延 2 %--------------------------------------------- % %QAM MODULATION % %--------------------------------------------- % %Generate the random binary stream for transmit test BitsTx =floor(rand(1,NumLoop*NumSubc)*2); %Modulate (Generates QAM symbols) %input: BitsTx(1,NumLoop*NumSubc); output: SymQAM(NumLoop,NumSubc/2) SymQAMtmp =reshape(BitsTx,2,NumLoop*NumSubc/2).'; SymQAMtmptmp =bi2de(SymQAMtmp,2,'left-msb'); %-------------------------------------------------------------------- %函数说明: %bin2dec(binarystr) interprets the binary string binarystr and returns the %equivalent decimal number. %bi2de 是把列向量的每一个元素都由 2进制变为 10进制%D=BI2DE(...,MSBFLAG) uses MSBFLAG todetermine the input orientation. %MSBFLAG has two possible values, 'right-msb' and 'left-msb'. Giving a %'right-msb' MSBFLAG does not change the function's default behavior. %Giving a'left-msb' MSBFLAG flips the input orientation such that the %MSB isonthe left. %%%D=BI2DE(...,P) converts abase Pvector toadecimal value. %%Examples: %%>>B=[0011;1010]; %%>>T=[011;210]; %%>>D=bi2de(B) >>D=bi2de(B,'left-msb') >> D=bi2de(T,3) %%D=D =D= %%12312 %%510 5 %-------------------------------------------------------------------- %QAM modulation %00->-1-i,01->-1+i,10->1-i,11->1+i %利用查表法进行 QAM 星座映射 QAMTable =[-1-i -1+i 1-i 1+i]; SymQAM =QAMTable(SymQAMtmptmp+1); %--------------------------------------------- % %IFFT % %--------------------------------------------- % %input: SymQAM(NumLoop,NumSubc/2); output: SymIFFT(NumSubc,NumLoop) SymIFFT =zeros(NumSubc,NumLoop); SymIFFTtmp =reshape(SymQAM,NumSubc/2,NumLoop); SymIFFTtmptmp =zeros(NumSubc,NumLoop); SymIFFTtmptmp(1,:) =real(SymIFFTtmp(1,:));