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大小: 657KB文件類型: .rar金幣: 2下載: 2 次發布日期: 2023-03-11
- 語言: 其他
- 標簽: QPSK??Modulation??Demodulation??
資源簡介
文中有很多QPSK調制解調程序,包括添加高斯白噪聲,仿真了誤碼率,并且加入了解調中的同步技術,非常有參考價值

代碼片段和文件信息
clear;?
SNRindB1=0:2:8;?????????????????????????????????????%?設置SNR范圍?
SNRindB2=0:0.1:8;?
for?ii=1:length(SNRindB1)?
?
counter=0;??????????????????????????????????????????%?計數器置0?
numofsymbolerror=0;?
numofbiterror=0;?
while?(numofbiterror<100)?
?
N=1000;?
E=1;????????????????????????????????????????????????%?碼元能量?
snr=10^(SNRindB1(ii)/10);???????????????????????????%?信噪比?
sgma=sqrt(E/snr)/2;?????????????????????????????????%?噪聲功率?
s00=[1?0];?s01=[0?-1];?s11=[-1?0];?s10=[0?1];???????%?雙比特碼元映射?
?
%?信源產生?
for?i=1:N?
????temp=rand;??????????????????????????????????????%?生成取值在0和1之間的服從均勻分布的隨機變量?
????if?(temp<0.25)?????????????????????????????????%?信源輸出00,10,11,01的概率均為1/4?
????????dsource1(i)=0;?dsource2(i)=0;?
????????tt(iii)=complex(s00(1)s00(2));?
????elseif?(temp<0.5)???????????????????????????????
????????dsource1(i)=0;?dsource2(i)=1;?
????????tt(iii)=complex(s01(1)s01(2));?
????elseif?(temp<0.75)??????????????????????????????
????????dsource1(i)=1;?dsource2(i)=0;?
????????tt(iii)=complex(s10(1)s10(2));?
????else?????????????????????????????????????????????
????????dsource1(i)=1;?dsource2(i)=1;?
????????tt(iii)=complex(s11(1)s11(2));?
????end;?
end;?
?
%?差錯檢測及誤碼率計算?
?
for?i=1:N?
????????mm=raylrnd(0.7);??
????n=sgma*randn(12);??????????????????????????????%?生成兩個服從N(0sgma)的隨機變量?
????if?((dsource1(i)==0)?&?(dsource2(i)==0))??
????????r=mm*s00+n;????????????????????????????????????%?加入噪聲?
????elseif?((dsource1(i)==0)?&?(dsource2(i)==1))??
????????r=mm*s01+n;?
????elseif?((dsource1(i)==1)?&?(dsource2(i)==0))??
????????r=mm*s10+n;?
????else??
????????r=mm*s11+n;?
????end;?
?????
????%?判決?
????rr(iii)=complex(r(1)r(2));?
????c00=dot(rs00);?c01=dot(rs01);?c10=dot(rs10);?c11=dot(rs11);?
????c_max=max([c00c01c10c11]);?
????if?(c00==c_max)?decis1=0;?decis2=0;?
????elseif?(c01==c_max)?decis1=0;?decis2=1;?
????elseif?(c10==c_max)?decis1=1;?decis2=0;?
????else?decis1=1;?decis2=1;?
????end;?
????%?計算誤碼率及誤符號率?
?????
????symbolerror=0;?
????if?(decis1~=dsource1(i))?numofbiterror=numofbiterror+1;?symbolerror=1;??
????end;?
????if?(decis2~=dsource2(i))?numofbiterror=numofbiterror+1;?symbolerror=1;??
????end;?
????if?(symbolerror==1)?numofsymbolerror=numofsymbolerror+1;??
????end;?
end;?
counter=counter+1;?
end;?
ps=numofsymbolerror/(N*counter);?????????????????????
pb=numofbiterror/(2*N*counter);??????????????????????
?
????smld_bit_err_prb(ii)=pb;?
????smld_symbol_err_prb(ii)=ps;?
????disp([pspb]);?
end;?
?
%?理論值?
for?i=1:length(SNRindB2)?
????SNR=10^(SNRindB2(i)/10);????????????????????????%?信噪比?
????theo_err_prb(i)=0.5*erfc(sqrt(SNR));????????????%?AWGN信道下的誤碼率理論值?
????theo_err_ray(i)=0.5*(1-1/sqrt(1+1/SNR));????????%?Rayleigh衰落信道下的誤碼率理論值?
end;?
?
%?畫圖?
figure(1)???????????????????????????????????????????%?BER圖?
semilogy(SNRindB1smld_bit_err_prb‘bs‘);?
%?legend(‘AWGN?Simulation‘);?
hold?on;?
semilogy(SNRindB1smld_symbol_err_prb‘ro‘);?
?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件???????3473??2010-09-09?09:37??QPSK\AWGN信道,BER?.m
?????文件???????3046??2010-09-06?19:36??QPSK\QPSK調制完整仿真\QPSK_Modulation.m
?????文件???????3048??2010-09-06?20:28??QPSK\QPSK調制完整仿真\QPSK_Modulation.asv
?????文件???????1991??2010-09-07?15:01??QPSK\wang無干擾算法的QPSK仿真\qpsksim.m
?????文件???????1625??2010-09-06?19:26??QPSK\QPSK定時恢復程序\QPSK4_Weitongbu.rar
?????文件???????4031??2008-06-23?16:46??QPSK\QPSK定時恢復程序\QPSK4_Weitongbu.m
?????文件??????56674??2010-09-06?19:34??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制\ASK-OOK-FSK-BPSK.rar
?????文件???????5282??2008-06-15?22:13??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制\Digital_modulation_FCN.zip
?????文件????????545??2008-03-28?18:32??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制\trabajos_MATLAB.txt
?????文件????????999??2008-03-28?18:52??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制\Digital_modulation_FCN\askd.m
?????文件???????1048??2008-03-28?18:52??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制\Digital_modulation_FCN\bpskd.m
?????文件???????2662??2008-03-28?18:52??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制\Digital_modulation_FCN\epsk.m
?????文件???????1218??2008-03-28?18:52??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制\Digital_modulation_FCN\fskd.m
?????文件???????1045??2008-03-28?18:52??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制\Digital_modulation_FCN\ookd.m
?????文件???????1751??2008-03-28?18:52??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制\Digital_modulation_FCN\qpskd.m
?????文件?????267264??2010-09-09?16:52??QPSK\QPSK系統仿真\QPSK系統仿真.doc
?????文件????????895??2010-09-07?21:42??QPSK\QPSK信號源的M文件\QPSK_source.m
?????文件?????203104??2010-09-07?17:01??QPSK\QPSK+Rayleigh(AWGN)仿真MATLAB程序\81404616QPSK+Rayleigh(AWGN)Simulation.zip
?????文件???????3402??2006-12-06?21:43??QPSK\QPSK+Rayleigh(AWGN)仿真MATLAB程序\BER.m
?????文件???????5398??2010-09-09?10:12??QPSK\QPSK+Rayleigh(AWGN)仿真MATLAB程序\QPSK.m
?????文件?????308736??2010-09-08?08:58??QPSK\QPSK+Rayleigh(AWGN)仿真MATLAB程序\分析報告.doc
?????文件???????5398??2010-09-09?10:09??QPSK\QPSK+Rayleigh(AWGN)仿真MATLAB程序\QPSK.asv
?????目錄??????????0??2010-12-08?13:29??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制\Digital_modulation_FCN
?????目錄??????????0??2010-12-08?13:29??QPSK\QPSK調制完整仿真
?????目錄??????????0??2010-12-08?13:29??QPSK\wang無干擾算法的QPSK仿真
?????目錄??????????0??2010-12-08?13:29??QPSK\QPSK定時恢復程序
?????目錄??????????0??2010-12-08?13:29??QPSK\matlab實現ASKOOKFSKBPSKQPSK8PSK調制
?????目錄??????????0??2010-12-08?13:29??QPSK\QPSK系統仿真
?????目錄??????????0??2010-12-08?13:29??QPSK\QPSK信號源的M文件
?????目錄??????????0??2010-12-08?13:29??QPSK\QPSK+Rayleigh(AWGN)仿真MATLAB程序
............此處省略5個文件信息
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