Transmission filter calculator, communication device and methods

US9088316B2 · kind B2 · utility

Assignee

• NTT DOCOMO, INC. · JP

Inventors

• Andreas Dotzler · Munich, DE
• Wolfgang Utschick · Ingolstadt, DE
• Guido Dietl · Munich, DE

Key dates

• Filing date: Mar 29, 2013
• Grant date: Jul 21, 2015
• Expiry date: Mar 29, 2033

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B7/0465
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

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