Re: spectral estimation
hi,
basically the problem is to find the frequencies present in the signal for this various spectrum estimation methods are used which try to estimate the frequencies of the incoming signal.
a good intoduction can be found in book "digital signal processing" by proakis and manolakis u also need to revise ur probability and statistics fundas before u delve deeper.
For detailed theory u may refer "adaptive filter theory" by simon haykins.
both these books were available in eda books upload/download u may get them there(unless they r removed!).
regards
pimr