H. Ali and A. Doucet (Australia), and Y. Hua (USA)
Blind Channel Identiﬁcation, OFDM, Subspace
This paper introduces a second order statistical (SOS) sub
space method for blind estimation of ﬁnite impulse re
sponse (FIR) channels in OFDM systems exploiting spa
tial redundancy with an antenna array at the receiving end.
The technique is robust to virtual carriers (VCs) and pos
sesses the advantage to preserve the classical OFDM emit
ter structure based on cyclic preﬁx (CP) insertion. There
fore it applies to all existing standardized multi-carrier sys
tems (DAB, DVB, etc.). We also propose very simple zero
forcing (ZF) and minimum mean square error (MMSE)
equalizers which can also be used in recently proposed zero
padded-OFDM (ZP-OFDM) systems. Monte Carlo simu
lations are used to provide examples of performance.