When we use subspace based blind channel estimation technique for MIMO-OFDM channel estimation, we divide the singular vectors of the received signal into noise subspace and signal subspace, and declare the matrix which minimizes the dot product of itself with noise subspace as the estimated channel, similar to all other blind techniques this procedure also does not give the true channel but gives upto a matrix multiple of the true channel, what are the techniques available to remove such an ambiguity? ,I do not wish to use any pilot sequences
I think the technique to resolve the ambiguity is to send a pilot :)
I am not aware of any other technique. If the phases of the channel elements are uniformly distributed between 0 and 2pi, then you need to observe some kind of signal with a known phase to have a chance to estimate the phases.
Channel estimation that uses both blind techniques and pilots are often called semi-blind.
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