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資源簡介

關于OFDM信道估計程序,有ofdm基本程序,信道模型等

資源截圖

代碼片段和文件信息

%author:liuqingwei?May?12th?2006?9:40?PM.
%OFDM?Channel?Estimation?based?on?Comb?Pilot
%IFFT_bin_length:?IFFT和FFT的點數
%carrier_count:?子載波個數
%bits_per_symbol:?每符號上的比特數
%symbols_per_carrier:?每楨的OFDM符號數
%X:欲發送的二進制比特流

clear?all;
clc;
IFFT_bin_length=128;
carrier_count=100;
bits_per_symbol=2;
symbols_per_carrier=12;
LI=7?;?%導頻之間的間隔
Np=ceil(carrier_count/LI)+1;%導頻數?%加1的原因:使最后一列也是導頻

N_number=carrier_count*symbols_per_carrier*bits_per_symbol;
carriers=1:carrier_count+Np;

GI=8;?????????????%?guard?interval?length
N_snr=40;??????????%?每比特信噪比
snr=8;?????????????%信噪比間隔
%------------------------------------------------------------
%?vector?initialization


X=zeros(1N_number);
X1=[];
X2=[];
X3=[];
X4=[];
X5=[];
X6=[];
X7=[];
Y1=[];
Y2=[];
Y3=[];
Y4=[];
Y5=[];
Y6=[];
Y7=[];
XX=zeros(1N_number);
dif_bit=zeros(1N_number);
dif_bit1=zeros(1N_number);
dif_bit2=zeros(1N_number);
dif_bit3=zeros(1N_number);
X=randint(1N_number);%產生二進制隨即序列(非0即1)
%--------------------------------------------------------
%QPSK調制:(1?1)->pi/4;(0?1)->3*pi/4;(0?0)->-3*pi/4;(10)->-pi/4;

s=(X.*2-1)/sqrt(2);
sreal=s(1:2:N_number);
simage=s(2:2:N_number);
X1=sreal+j.*simage;

%---------------------------------------------------------
%產生隨機導頻信號
%--------------------------------------------------------
train_sym=randint(12*symbols_per_carrier);
t=(train_sym.*2-1)/sqrt(2);
treal=t(1:2:2*symbols_per_carrier);
timage=t(2:2:2*symbols_per_carrier);
training_symbols1=treal+j.*timage;
training_symbols2=training_symbols1.‘;
training_symbols=repmat(training_symbols21Np);

%disp(training_symbols)
pilot=1:LI+1:carrier_count+Np;
if?length(pilot)~=Np
????pilot=[pilotcarrier_count+Np];
end
%--------------------------------------------------------
%串并轉換
X2=reshape(X1carrier_countsymbols_per_carrier).‘;
%---------------------------------------------------------
%插入導頻
signal=1:carrier_count+Np;
signal(pilot)=[];
X3(:pilot)=training_symbols;
X3(:signal)=X2;
%X3=cat(1training_symbolsX2);
IFFT_modulation=zeros(symbols_per_carrierIFFT_bin_length);
IFFT_modulation(:carriers)=X3;
%IFFT_modulation(:conjugate_carriers)=conj(X3);
X4=ifft(IFFT_modulationIFFT_bin_length2);
%X5=X4.‘;
%加保護間隔(循環前綴)
for?k=1:symbols_per_carrier;
???for?i=1:IFFT_bin_length;
??????X6(ki+GI)=X4(ki);
???end
???for?i=1:GI;
??????X6(ki)=X4(ki+IFFT_bin_length-GI);????
???end
end
%---------------------------------------------------------
%并串轉換
X7=reshape(X6.‘1symbols_per_carrier*(IFFT_bin_length+GI));

%---------------------------------------------------------
%信道模型:帶多普勒頻移的瑞利衰落信道

fd=100;?%多普勒頻移
r=6;???%多徑數
a=[0.123?0.3?0.4?0.5?0.7?0.8];?%多徑的幅度
d=[2?3?4?5?9?13];?%各徑的延遲
T=1;??%系統采樣周期
th=[90?0?72?144?216?288]*pi./180;%相移
h=zeros(1carrier_count);
hh=[];
????for?k=1:r
????????%deta=[zeros(1d(k)-1)1zeros(1carrier_count-d(k))];
????????h1=a(k)*exp(j*((2*pi*T*fd*d(k)/carrier_count)));
????????%h1=a(k)*exp(j*((2*pi

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????1668??2006-05-15?11:10??OFDM及信道估計的程序\basic?OFDM\BPSKmodanddemod.m

?????文件???????1833??2006-05-15?11:10??OFDM及信道估計的程序\basic?OFDM\increaseber.m

?????文件??????14591??2007-12-24?15:02??OFDM及信道估計的程序\basic?OFDM\ofdm.m

?????文件???????4707??2006-05-15?11:10??OFDM及信道估計的程序\basic?OFDM\ofdm_ber.m

?????文件???????8177??2007-11-27?16:49??OFDM及信道估計的程序\comb.m

?????文件????????423??2006-05-09?10:38??OFDM及信道估計的程序\mathworks\M?S?E\LS_MSE_calc.m

?????文件????????569??2006-05-09?10:38??OFDM及信道估計的程序\mathworks\M?S?E\MMSE_MSE_calc.m

?????文件???????3622??2006-05-09?10:38??OFDM及信道估計的程序\mathworks\M?S?E\MSE_compare.m

?????文件???????6312??2006-05-09?11:44??OFDM及信道估計的程序\mathworks\S?E?R\SER_compare.m

?????文件????????302??2004-12-07?11:38??OFDM及信道估計的程序\mfile\add_noise.m

?????文件????????292??2004-12-06?18:44??OFDM及信道估計的程序\mfile\cut_cp.m

?????文件????????270??2004-12-06?19:06??OFDM及信道估計的程序\mfile\de_map.m

?????文件???????1142??2004-06-16?10:09??OFDM及信道估計的程序\mfile\de_qam16.m

?????文件????????271??2004-12-07?11:29??OFDM及信道估計的程序\mfile\error_count.m

?????文件????????369??2004-12-07?10:58??OFDM及信道估計的程序\mfile\input_b.m

?????文件????????388??2004-12-06?18:07??OFDM及信道估計的程序\mfile\insert_cp.m

?????文件????????945??2004-12-07?11:57??OFDM及信道估計的程序\mfile\insert_pilot.m

?????文件????????940??2008-09-04?09:56??OFDM及信道估計的程序\mfile\lmmse_estimation.m

?????文件???????1612??2008-09-04?09:57??OFDM及信道估計的程序\mfile\lr_lmmse_estimation.m

?????文件????????553??2008-09-04?09:54??OFDM及信道估計的程序\mfile\ls_estimation.m

?????文件????????380??2004-12-06?20:04??OFDM及信道估計的程序\mfile\map_16qam.m

?????文件???????1886??2004-12-06?16:08??OFDM及信道估計的程序\mfile\multipath_chann.m

?????文件???????4849??2004-12-09?14:49??OFDM及信道估計的程序\mfile\ofdm_system.m

?????文件????????526??2004-06-16?10:09??OFDM及信道估計的程序\mfile\qam16.m

?????文件???????1758??2004-12-06?14:58??OFDM及信道估計的程序\mfile\rayleighnew.m

?????文件????????225??2004-12-07?16:08??OFDM及信道估計的程序\mfile\Rhh_test.m

?????文件???????1292??2004-12-09?12:41??OFDM及信道估計的程序\mfile\selec_rayleigh_test.m

?????文件????????446??2004-12-09?19:49??OFDM及信道估計的程序\mfile\SIR_n_fd.m

?????文件??????11603??2009-08-03?21:15??OFDM及信道估計的程序\OFDM3.m

?????文件????????299??2005-02-18?10:50??OFDM及信道估計的程序\pdf_cdf_gen.m

............此處省略34個文件信息

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