Method and network node for calculating transmitter precoding weights and receiver combining weights for a MIMO antenna system
AssigneeNutaq Innovation Inc.
InventorMessaoud Ahmed Ouameur
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to a method and a network node for calculating transmitter precoding weights and receiver combining weights for a multiple input multiple output (MIMO) antenna system. Channel responses are estimated at the network node for user terminals accessing the network node on a carrier. Zero forcing beamforming weights are determined for the carrier by adding one of the user terminals at a time in a calculation of an inverse of a Gram matrix containing parameters of the channel responses.
Claims19
A method in a network node implementing a multiple input multiple output (MIMO) antenna system, the method comprising:
- estimating, at the network node, channel responses for user terminals accessing the network node on a carrier;
- determining zero forcing beamforming weights for the carrier by adding one of the user terminals at a time in a calculation of an inverse of a Gram matrix containing parameters of the channel responses;
- receiving, at the network node, downlink symbols for transmission towards one of the user terminals;
- precoding the downlink symbols using the zero forcing beamforming weights;
- and
- transmitting, from the network node on the carrier, the precoded downlink symbols towards the one of the user terminals via an array of M antennas.
A network node implementing a multiple input multiple output (MIMO) antenna system, the network node comprising:
- an array of M antennas adapted to transmit signals toward user terminals accessing the network node on a carrier and to receive signals from the user terminals;
- an estimator of channel responses received on the array of M antennas from the user terminals;
- a weight calculator of zero forcing beamforming weights for the carrier by adding one of the user terminals at a time in a calculation of an inverse of a Gram matrix containing parameters of the channel responses;
- a precoding module adapted to receive downlink symbols for transmission towards one of the user terminals and to precode the downlink symbols using the zero forcing beamforming weights, wherein the precoding module is implemented using one of software, firmware, hardware and a combination thereof;
- and
- a transmitter adapted to transmit the precoded downlink symbols towards the one of the user terminals on the carrier via the array of M antennas.
Dependencies are inferred from the claim text.