Antenna device and method for precoding data in a multiple-input multiple-output system

摘要

An antenna device and method for precoding data in a MIMO system. The antenna device comprises a plurality of physical antennas in a distributed antenna system and a MIMO precoder. The MIMO precoder has a plurality of inputs for a plurality of data streams and a plurality of outputs for the plurality of data streams. A second precoder is disposed in series with the MIMO precoder. The second precoder maps a data stream to an output associated with a physical antenna port associated with at least one of the plurality of physical antennas.

主权项

1. An antenna device for precoding data in a Multiple-Input Multiple-Output system, the antenna device comprising:
a plurality of physical antennas in a distributed antenna system; a Multiple-Input Multiple-Output precoder, the Multiple-Input Multiple-Output precoder having a plurality of inputs for receiving a plurality of data streams and arranged to map weighted combinations of the data streams to a plurality of precoded outputs via a set of weights; and a second precoder disposed in series with the Multiple-Input Multiple-Output precoder, the second precoder arranged to receive the precoded outputs and map at least one weighted combination of the precoded outputs to an output associated with a physical antenna port associated with at least one of the plurality of physical antennas, wherein the second precoder is arranged to perform an inverse operation to that performed by the Multiple-Input Multiple-Output precoder, and wherein the second precoder is arranged to map all data stream pilot signals to each physical antenna port associated with the plurality of physical antennas.