TRANSMISSION FILTER CALCULATOR, COMMUNICATION DEVICE AND METHODS

摘要

A transmission filter calculator for calculating at least a transmit filter for a communication from a transmit communication device comprising a plurality of antennas to a receive communication device out of a plurality of receive communication devices comprising a plurality of antennas via a multiple-input-multiple-output channel, is configured to iteratively determine transmit filters (va) for a plurality of data streams (sa). The transmission filter calculator is configured to choose a transmit filter (va) in a given iteration (d) such that the transmit filter (va) chosen in the given iteration is orthogonal to one or more transmit filters (va) chosen in one or more previous iterations, and such that a weighted or unweighted transmission rate (ra) obtainable using the transmit filter (va) chosen in the given iteration (d) is maximized. The transmission filter calculator is configured to choose the transmit filter (va) in dependence on a matrix product term which is based on a channel matrix (HSd) describing MIMO channel characteristics between the transmit communication device and a currently considered one (sa) of the receive communication devices and on a distortion covariance matrix (C^a) describing a noise, an inter-cell interference and an upper limit of an intra-cell interference.