C. Tepedelenlioglu et Gb. Giannakis, Transmitter redundancy for blind estimation and equalization of time- and frequency-selective channels, IEEE SIGNAL, 48(7), 2000, pp. 2029-2043
Joint mitigation of time- and frequency-selective fading is an important an
d challenging problem in mobile communications, Relying on transmitter-indu
ced redundancy, we propose novel channel estimation and symbol recovery app
roaches for blind identification and equalization of time- and frequency-se
lective channels, where the time variation is modeled deterministically by
a basis expansion. The resulting statistical algorithm enables the usage of
a single antenna, dispenses with channel disparity conditions of existing
approaches, and allows channel order overestimation. In addition, new deter
ministic algorithms for generalized OFDM systems are introduced that produc
e reliable estimates with few data points; at high SNR's, Simulations illus
trate the approaches developed.