A NEW SUBSPACE ALGORITHMFOR BLIND CHANNEL ESTIMATION IN BROADBANDSPACE-TIME BLOCK CODED COMMUNICATIONSYSTEMS
Ignacio Santamarı́a · 2008
In this paper a new subspace method for blind estima tion of frequency-selective channels is proposed. Specifi cally, we consider the case of broadband space-time block coded (STBC) transmissions such as STBC-OFDM, space frequency block coding (SFBC), or time-reversal STBC. The proposed technique is able to exactly recover the channel within a limited number of data blocks, and its computa tional complexity is linear in the number of subcarriers or data-block size. Furthermore, it is independent of the spe cific signal constellation, and therefore it can also be applied when the sources have been precoded to exploit the mul tipath diversity. Finally, the performance of the proposed method is evaluated by means ofsome numerical examples.