Reduced rank spatial filter for interference cancellation

In radio mobile communication, antenna array structure at the reception is used to perform interference cancellation and equalization. We introduce a reception structure where a spatial filter is split between a set of coefficients applied to received signals and a set of coefficients applied to reference signal (pilots symbols). Instead of trying to find this set of filter coefficients, the approach is based, for rank reduction reasons, on the projection of these coefficients on a discrete Fourier basis. In order to avoid a trivial solution, two constraints on filter coefficients are proposed, related algorithms are developed and simulation results are compared. This paper can be viewed as a follow up of a previous work on a similar topic [1].