estimation, equalization and detection

what is the difference between estimation, equalization and detection in communication systems? specially in ofdm technique ?

Answer 1

[Thomas]

Not sure what this has to do with MATLAB.. but here goes after a short goggle search:

Estiamtion: cache.freescale.com/files/dsp/doc/app_note/AN3059.pdf

equalization: http://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiplexing#Simplified_equalization

detection: witlab.inha.ac.kr/papers/2009/.../Blind_OFDM_Detection.pdf