%File:timing_syn.m?timing?synchronization
clc
clear
Data_Len?=?8030;

Fs?=?10000;??????????????????%?Sampling?Frequency
Fd?=?2500;??????????????????%?Symbol?Frequency
SNR_max?=?12;???????????????????%?S/N?Ratio?for?Chanel?Simulatioin?
SNR_min?=?4;
RolloffCoef?=?0.35;?????????%?Roll?Off?Coeff.
T_Gain?=?0.09;??????????????%?TED?Loop?Gain

Ratio?=?Fs/Fd/2;????????????%?=?Ts/Td/2
Offset?=?23;????????????????%???

mm?=?1;
%for?snr=SNR_min:1:SNR_max
%for?RolloffCoef_a=0.1:0.05:0.4
x=??zeros（1Data_Len/2）;????%產生的符號數

timing_error?=?0;
datalen?=?Fs?/?Fd?*?（Data_Len?-?Offset）;
displaysize??=?128;
ted_out?=?zeros（1displaysize）;
%Interp_Pos?=?2*Ratio?+?Ratio;
Interp_Pos?=?Ratio;
Rec_out?=?zeros（1displaysize）;
h?=?[0.04?-0.36?0.60?-0.36?0.04];
disp（‘1?Data?Send‘）;
%1+++++++++++++Data?Source+++++++++++++++++++
disp（‘??1.1?Data?Source‘）;
%x?=?（-1）.^（rand（1Data_Len）>0.5）?+?j?*?（-1）.^（rand（1Data_Len）>0.5）;
source?=?randint（1Data_Len）;

sig_i?=?[1?source（1:2:end）];
sig_q?=?[1?source（2:2:end）];

DQpsk?=?zeros（2length（sig_i））;

for?i?=?1:length（sig_i）
????if?i?==?1
????????DQpsk（1i）?=?1;
????????DQpsk（2i）?=?1;
????else
????????DQpsk（1i）?=?abs（xor（pre_ipre_q）-1）*xor（sig_i（i）pre_i）?+?xor（pre_ipre_q）*xor（sig_q（i）pre_i）;
????????DQpsk（2i）?=?abs（xor（pre_ipre_q）-1）*xor（sig_q（i）pre_q）?+?xor（pre_ipre_q）*xor（sig_i（i）pre_q）;
????end
????pre_i?=?DQpsk（1i）;
????pre_q?=?DQpsk（2i）;
????x（i）=（DQpsk（1i）*2-1）+j*（DQpsk（2i）*2-1）;
end
??DQpsk?=?DQpsk*2-1;
%tx_signal=rcosflt（xFdFs‘fir‘0.2510）;

%?figure（1）
%?plot（x‘k*‘）;
%?xlabel（‘real‘）
%?ylabel（‘image‘）
%?xlim（[-2.0?2.0]）;
%?ylim（[-2.0?2.0]）;
%?title（‘Sending?Conset‘）
%?grid?on;

%+++++++++++++pulse?shaping+++++++++++++++++++
%????????Using?Rolloff?Setting
%+++++++++++++++++++++++++++++++++++++++++++++
disp（‘??1.2?Pulse?Shaping‘）;
x_t=rcosflt（xFdFs‘sqrt‘RolloffCoef）;
%?figure（7）;
%?x_kk=fft（x_t）;
%?plot（abs（x_kk）‘-‘‘MarkerSize‘14）;
%+++++++++++++channel?simulation++++++++++++++
%???Add?White?Offsetoise?Using?SOffsetR?Setting????????
%+++++++++++++++++++++++++++++++++++++++++++++
disp（‘2?Channel?Simulation‘）;

c_t?=?awgn（x_t15‘measured‘）;

%++++++++++++++++++receive++++++++++++++++++++
disp（‘3?Receive‘）;

%4++++++++++Matching?Filter++++++++++++++++++++
disp（‘??3.1?Matching?Filter‘）;
%matched_data=rcosflt（r_tFdFs‘sqrt/Fs‘RolloffCoef）;

r_c_t=resample（c_t1001710000）;
r_t=rcosflt（r_c_tFdFs‘sqrt/Fs‘RolloffCoef）;
matched_data=[r_t（Offset+1:end-Offset）];

%++++++++++++Timing?Recovery+++++++++++++++++++
%?=======Gardner?Timing?Recovery===============?
%??TE（k）={Y[（k-1）Td]-Y[kTd]）*Y[（kTd-Td/2]
%?=======Parabolic?Interpolation===============?
%?????C_2?=??0.5?*?mu^2?-?0.5?*?mu;
%?????C_1?=?-0.5?*?mu^2?+?（?0.5?+?1?）?*?mu;
%?????C0??=?-0.5?*?mu^2?+?（?0.5?-?1?）?*?mu?+?1;
%?????C1??=??0.5?*?mu^2?-?0.5?*?mu;
%+++++++++++++++++++++++++++++++++++++++++++++++
disp（‘??3.2?Timing?Recovery‘）;
C_2?=?inline（‘0.

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

?????文件???????8190??2012-07-27?10:51??timing_syn_Gardner.m

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

?????????????????8190????????????????????1