Patent ID: 9407337
Filing Date: 2016-08-02
CPC Classification: H04B,H04L

Claim Text:
1. A Multi-Input-Multi-Output (MIMO) antenna system, comprising; a plurality of first antennas; and a measurement module, coupled to the plurality of first antennas, configured to estimate a channel from the plurality of first antennas to a plurality of second antennas and to select a subset of the plurality of first antennas for transmitting a plurality of signals to the plurality of second antennas, wherein a size of the selected subset of the plurality of first antennas is equal to M, and wherein the measurement module is further configured to, for each subset of size M of the plurality of first antennas: form, using the estimated channel, a sub-channel matrix h corresponding to a sub-channel between the subset and the plurality of second antennas, form a channel matrix equal to a product of a conjugate transpose of h by h, perform a singular value decomposition (SVD) of the channel matrix to determine a unitary matrix U, a diagonal matrix D having positive diagonal elements, and an orthogonal matrix V, and compute a function of the positive diagonal elements of the diagonal matrix D to select the subset of the plurality of first antennas.