资源简介
降低OFDM系统PAPR算法MATLAB仿真,有PTS、SLM、C变换三种算法的CCDF仿真。
代码片段和文件信息
% Clipping and Filtering
% ========================================================================
% 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([4 12])
grid on
属性 大小 日期 时间 名称
----------- --------- ---------- ----- ----
文件 2657 2010-10-15 16:40 新建文件夹\Clipping_and_Filtering.m
文件 2933 2010-10-15 16:40 新建文件夹\PTS_PAPR_Simulation.m
文件 2220 2010-11-21 15:43 新建文件夹\slm.m
文件 2155 2010-10-15 16:40 新建文件夹\SLM2.m
目录 0 2010-11-30 12:48 新建文件夹
----------- --------- ---------- ----- ----
9965 5
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