How to find approximation and detail coefficient from a reconstructed signal?

Hi I want to decompose a signal and by reconstructing this signal try to find approximation and detail coefficient from the reconstructed signal. For decomposition I used single level decomposition(Discrete Wavelet Transform-Db6) and for reconstruction I used inverse discrete wavelet transform. But using idwt I have found only approximation coefficient. But I want to find detail coefficient from original signal or reconstructed signal. How can i do this?

ss=load('Fah_2-L05.mat');
[cA1,cD1] = dwt(ss.data,'db6');
[cA2,cD2] = dwt(cA1,'db6');

[cA3,cD3] = dwt(cA2,'db6');

[cA4,cD4] = dwt(cA3,'db6');

[cA5,cD5] = dwt(cA4,'db6');

[cA6,cD6] = dwt(cA5,'db6');

[cA7,cD7] = dwt(cA6,'db6');

[cA8,cD8] = dwt(cA7,'db6');
A8 = idwt(cA8,cD8,'db6'); %approximation coefficient of level 8

Answer 1

[Muhammad Ramzan]

%%%may be it will help you 

ss=load('Fah_2-L05.mat');

[cA1,cD1] = dwt(ss,'db8');

A1 = upcoef('a',cA1,'db8',1,l_s); 

D1 = upcoef('d',cD1,'db8',1,l_s);

[C,L] = wavedec(o,8,'db8');

%%Approximattion Coff:
A2 = wrcoef('a',C,L,'db8',2);

A3 = wrcoef('a',C,L,'db8',3);

A4 = wrcoef('a',C,L,'db8',4);

A5 = wrcoef('a',C,L,'db8',5);

A6 = wrcoef('a',C,L,'db8',6);

A7 = wrcoef('a',C,L,'db8',7);

A8 = wrcoef('a',C,L,'db8',8);

%%Details Coff:

D2 = wrcoef('d',C,L,'db8',2);

D3 = wrcoef('d',C,L,'db8',3);

D4 = wrcoef('d',C,L,'db8',4);

D5 = wrcoef('d',C,L,'db8',5);

D6 = wrcoef('d',C,L,'db8',6);

D7 = wrcoef('d',C,L,'db8',7);

D8 = wrcoef('d',C,L,'db8',8);

For reconstruction you can use:

ss= A1+D1;
%%or
ss=A2+D1+D2;
%%or ss= A3+D1+D2+D3; %%and so on

Answer 2

[Asfaw Alem]

how can apply dwt and idwt in ofdm to analysis wavelet families in OFDM