A blind spatio-temporal equalizer for a radio-mobile channel using the constant modulus algorithm (CMA)

Discusses constant modulus signal recovery by a multi-sensor receiver in a multipath propagation channel. The author first shows that spatio-temporal filtering can recover the transmitted signal provided that the number of sensors minus one times the length of the temporal filtering be larger than the intersymbol interference length assumed to be finite. It is also shown that spatio-temporal filtering is able to cancel jammers that have undergone multiple paths, at the expense of an increase in the number of sensors or in the temporal filtering length. The filtering is obtained adaptively by a blind algorithm, the CMA, which relies on the property of the transmitted signal to have a constant modulus, which is the case of phase and frequency modulated signals, widely used in telecommunications