Description: A subspace-based blind method is proposed for estimating
the channel responses of a multiuser and multiantenna orthogonal
frequency division multiplexing (OFDM) uplink system.
It gives estimations to all channel responses subject to a scalar matrix
ambiguity and does not need precise channel order information
(only an upper bound for the orders is required). Furthermore,
the scalar ambiguity matrix can be easily resolved by using only
one pilot OFDM block, given that the number of users is smaller
than the number of symbols in the pilot symbol block. Equalization
methods are discussed based on the estimated channels. By using
partial knowledge of the channels, a multipath subspace method is
proposed that reduces the computational complexity. Simulations
show that the methods are effective and robust.
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