Downlink space-time processing for FDD systems

The focus of this paper is downlink space-time processing for FDD (Frequency Division Duplex) radiocommunication systems whose base stations are equipped with antenna arrays. It shows how space-time filters can be appropriately designed for downlink in order to both combat co-cohannel interferences and reduce fading effects. These filters, which can be estimated from uplink data only, are an extension of previous schemes which considered only space processing for downlink.