No self-introduction
Loading
Profile
Follow
codes (4)
earlylate calculation simulation
no vote
%
% sim_sym_sync_earlylate.m -- Early-Late sampling time control
% Programmed by park
close all
clear all
%******************** Preparation part *************************************
KC = 1; % 1/0 for timing recovery or not
Ns = 80; % Number of sample times per symbol time
Ts = 1;
T = Ts/Ns; % Symbol/Sample time
Delay = 3; % Number of delay symbol times of XMTR filter
rof = 0.5; % Roll-off factor
%************************* Filter initialization ***************************
% Square Root Raised Cosine Filtering with upsampling of Ns ? P6.1(h)
Fd = 1/Ts;
Fs = Fd*Ns;
SRRC_filter = rcosine(Fd,Fs,'fir/sqrt',rof,Delay);
[g,tg] = rcosflt([1],Fd,Fs,'filter',SRRC_filter); % SRRC
park123 2 0
1
doppler channel modeling
4.0
% plot_Jakes_model.m
clear all, %close all
% Parameters
fd=100; Ts=1e-6; % Doppler frequency and Sampling time
M = 2^12; t=[0:M-1]*Ts; f=[-M/2:M/2-1]/(M*Ts*fd);
Ns = 50000; t_state=0;
% Channel generation
[h,t_state]=Jakes_Flat(fd,Ts,Ns,t_state,1,0);
figure();
%subplot(311),
plot([1:Ns]*Ts,10*log10(abs(h))),
%title(['Jakes Model, f_d=',num2str(fd),'Hz, T_s=',num2str(Ts),'s']);
title(['Jakes Model, f_d=',num2str(fd),'Hz']);
axis([0 0.05 -30 10]), xlabel('time[s]'), ylabel('Magnitude[dB]')
% subplot(323), hist(abs(h),50);
% title(['Jakes Model, f_d=',num2str(fd),'Hz, T_s=',num2str(Ts),'s']);
% xlabel('Magnitude') , ylabel('Occasions')
% subplot(324), hist(angle(h),50);
% title(['Jakes Model, f_d=',num2str(fd),'Hz, T_s=',num2str(Ts),'s']);
% xlabel('Phase[rad]'), ylabel('Occasions')
% Autocorrelation of channel
park123 2 0
1
digital predistortion algorithm simulation
4.0
clear all;
close all;
clc;
signal = OFDM_TX_FRAME(2048,1447,512,12,1) ; %signal generation s(n)
power = mean(abs(signal).^2); % input power
backoff_dB = 12.5; % back off in linear scale
power_in_dB = 10*log10(power); % Back Off
fact_norm = sqrt(10^(-(backoff_dB+ power_in_dB)/10)); % back off
gain_imb = .0; % gain imabalance of modulator in linear scale
phase_imb = 0; % phase imbalance of modulator in degrees
dc_offset = 0.0 + 1i*0.0 ;% dc_offset
modulator_in = signal*fact_norm; % variable for storing input signal
[PA_input_before_compensation mixer_in] = modulator(modulator_in,gain_imb,phase_imb,dc_offset);
% spectrum monitoring
% Fs= 7.68e6;
% hPsd = spectrum.welch('Blackman',2048);
% hopts = psdopts(hPsd);
% set(hopts,'SpectrumType','twosided','NFFT',2048,'Fs',Fs,'CenterDC',true);
% PSD1 = psd(h
park123 3 0
1
polyphase filter simulation
4.0
Polyphase is the way to lead the sample rate conversion
park123 0 0
1
No more~
Follows0
Fans0