Reduction of intracell and intercell interference for array MC-DS-CDMA

The paper is concerned with asynchronous, multicarrier DS-CDMA communications using a receiver with an antenna array. An estimator is proposed to find the composite channel vector for each-intracell user; the only prerequisite being that each user´s spreading sequence is available at the receiver. In the uplink, the base station typically does not have knowledge of the spreading sequences active in neighbouring cells, so that intercell interference must be blindly suppressed. Consequently, an implementation of the whitening zero-forcing receiver that reduces both intracell and intercell interference is proposed which only requires knowledge of the intracell users´ spreading sequences. The effectiveness of this receiver is demonstrated by computer simulations.