Transmission filter calculator, communication device and methods
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United States of America Patent
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Jul 21, 2015
Grant Date -
Oct 3, 2013
app pub date -
Mar 29, 2013
filing date -
Mar 30, 2012
priority date (Note) -
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status (Latency Note)
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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.
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