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    發布日期: 2024-07-22
  • 語言: 其他
  • 標簽: OFDM??PAPR??

資源簡介

減小OFDM系統PAPR的三種經典方法。

資源截圖

代碼片段和文件信息


%?Repeated?Clipping?and?Filtering--PAPR?Simulation
%
%?Reference:?J.?Armstrong?New?OFDM?peak-to-average?power?reduction?scheme.
%?
%?Author:?Bin?Jiang
%?National?Mobile?Communication?Research?Laboratory
%?Southeast?University?210096?Nanjing?China
%?Email:?bjiang@seu.edu.cn

clear?all;?clc;?close?all;
K??=?128;???????????????????????????????????????????????????????????????????%?SIZE?OF?OFDM?Symbol
IF?=?2;?????????????????????????????????????????????????????????????????????%?Interpolation?factor?(Oversampling?factor)
N??=?K*IF;??????????????????????????????????????????????????????????????????%?SIZE?OF?FFT
CR?=?4;?????????????????????????????????????????????????????????????????????%?Clipping?ratio?(linear?4?<==>log?6dB)
QPSK_Set??=?[1?-1?j?-j];
??
ITERATE_NUM?=?4;
MAX_SYMBOLS??=?1e4;
PAPR_Orignal?=?zeros(1MAX_SYMBOLS);
PAPR_RCF?????=?zeros(ITERATE_NUMMAX_SYMBOLS);
for?nSymbol=1:MAX_SYMBOLS
????Index?=?randint(1Klength(QPSK_Set))+1;
????X?=?QPSK_Set(Index(1:));???????????????????????????????????????????????%?Orignal?Frequency?domain?signal
????XX?=?[X(1:K/2)?zeros(1N-K)?X(K/2+1:K)];
????
????x?=?ifft(XX[]2);??????????????????????????????????????????????????????%?Time?domain?signal
????Signal_Power?=?abs(x.^2);
????Peak_Power???=?max(Signal_Power[]2);
????Mean_Power???=?mean(Signal_Power2);
????PAPR_Orignal(nSymbol)?=?10*log10(Peak_Power./Mean_Power);
????
????for?nIter=1:ITERATE_NUM
????????%?Clipping
????????x_tmp?=?x(Signal_Power>CR*Mean_Power);
????????x_tmp?=?sqrt(CR*Mean_Power)*x_tmp./abs(x_tmp);
????????x(Signal_Power>CR*Mean_Power)?=?x_tmp;
????????
????????%?Filtering
????????XX?=?fft(x[]2);
????????XX(K/2+(1:N-K))?=?zeros(1N-K);
????????x?=?ifft(XX[]2);?
????????
????????%?PAPR?Compute
????????Signal_Power?=?abs(x.^2);
????????Peak_Power???=?max(Signal_Power[]2);
????????Mean_Power???=?mean(Signal_Power2);
????????PAPR_RCF(nIternSymbol)?=?10*log10(Peak_Power./Mean_Power);
????end
end

[cdf0?PAPR0]?=?ecdf(PAPR_Orignal);
[cdf1?PAPR1]?=?ecdf(PAPR_RCF(1:));
[cdf2?PAPR2]?=?ecdf(PAPR_RCF(2:));
[cdf3?PAPR3]?=?ecdf(PAPR_RCF(3:));
[cdf4?PAPR4]?=?ecdf(PAPR_RCF(4:));

%--------------------------------------------------------------------------
semilogy(PAPR01-cdf0‘-b‘PAPR11-cdf1‘-r‘PAPR21-cdf2‘-g‘PAPR31-cdf3‘-c‘PAPR41-cdf4‘-m‘)
legend(‘Orignal‘‘One?clip?and?filter‘‘Two?clip?and?filter‘‘Three?clip?and?filter‘‘Four?clip?and?filter‘)
xlabel(‘PAPR0?[dB]‘);
ylabel(‘CCDF?(Pr[PAPR>PAPR0])‘);
xlim([0?12])
grid?on


%想問下我看了下一些文檔CR的定義是CR?=?Amax/sqrt(Pin),是限幅的最大幅度與均方根功率的比值
%所以是不是把程序中的
%????????x_tmp?=?x(Signal_Power>CR*Mean_Power);
%????????x_tmp?=?CR*Mean_Power*x_tmp./abs(x_tmp.^2);
%????????x(Signal_Power>CR*Mean_Power)?=?x_tmp;
%改成?Ax=abs(x);
%????????A=CR*sqrt(Mean_Power);
%????????x_tmp?=?x(Ax>A);
%????????x_tmp?=?x_tmp*A./abs(x_tmp);???????????????????????????????????????????
%????????x(Ax>A)?=?x_tmp;
%更合理一些呢?

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

?????文件???????3028??2007-07-04?13:33??01\Clipping?and?Filtering-PAPR.m

?????文件???????3054??2007-07-04?13:09??01\PTS-PAPR.m

?????文件???????1418??2007-06-01?11:14??01\SLM-PAPR.m

?????目錄??????????0??2013-06-04?08:51??01

-----------?---------??----------?-----??----

?????????????????7500????????????????????4


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