Blind joint equalization of multiple synchronous mobile users using oversampling and/or multiple antennas
Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers (1994)
Pacific Grove, CA, USA
Oct. 31, 1994 to Nov. 2, 1994
D.T.M. Slock , Dept. of Mobile Commun., Inst. EURECOM, Sophia Antipolis, France
We consider multiple (p) users that operate on the same carrier frequency and use the same linear digital modulation format. We consider m>p antennas receiving mixtures of these signals through multipath propagation (equivalently, oversampling of the received signals of a smaller number of antenna signals could be used). We consider conditions on the matrix channel response for the existence of a zero-forcing equalizer (ZFE) (which cancels intersymbol and inter-user interference). In the noise free case, we show how a ZFE can be obtained from linear prediction and the channel matrix itself can also be determined as a byproduct. The problem is one of signal and noise subspaces and we show a convenient way of solving the deterministic maximum likelihood problem using a minimal linear parameterization of the noise subspace. This parameterization is found as a byproduct in the linear prediction problem.<
equalisers, multipath channels, receiving antennas, intersymbol interference, prediction theory, signal sampling, maximum likelihood estimation, land mobile radio, interference suppression, covariance matrices, matrix decomposition, multi-access systems
D. Slock, "Blind joint equalization of multiple synchronous mobile users using oversampling and/or multiple antennas," Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers(ACSSC), Pacific Grove, CA, USA, 1995, pp. 1154-1158.