determing power spectral density of a signal

i have a signal 

y=h*s+n
 
where * indicates convolution.

how can i determine numerically the power spectral density of 's'
,if i know 'y','h' and i know power spectral density of 'n' and i donot
know 's'.

On Jul 5, 4:19 am, "Sylvia" <sylvia.za...@gmail.com> wrote:
> i have a signal
>
> y=h*s+n
>
> where * indicates convolution.
>
> how can i determine numerically the power spectral density of 's'
> ,if i know 'y','h' and i know power spectral density of 'n' and i donot
> know 's'.

sounds like homework.