implementation of lms adaptive filter in matlab -

How does adaptfilt.lms work in matlab? Nobody knows what will be the structure of the filter when we create and use

  mu = 0.09; % LMS step size is = adaptfilt.lms (32, mu); [Or, e] = filter (ha, x, d);  

Where do the desired output, X-real output?
X and D are of size 2048 x 1, I need the structure of the filter.

This is FIR (finite impulse response) filter. The structure is as follows:

  y (k) = b (1) .x (k) + ... + b (n) .x (kn + 1)  

where b is a polynomial, as found in the form of a Ha authifier , the data according to the lms method.