Telefonaktiebolaget Lm Ericsson (Publ)

Christopher Mollén

Erik G Larsson

Ulf Gustavsson

A transmission power allocation method for a transmitter is disclosed. The transmitter includes a number of at least two transmitter paths for spatial multiplexing of two or more signals to be transmitted using respective allocated transmission powers to respective ones of two or more users, wherein each transmitter path includes at least one component causing non-linear distortion and a transmit antenna. The method includes determining a respective received distortion power for each of the two or more users as a function of respective hypothesized transmission powers for the two or more users and based on a model of a spatial behavior of the non-linear distortion. The method also includes allocating respective transmission powers for the two or more users based on the determined respective received distortion powers. Corresponding transmission power allocation apparatus, transmitter, network node, wireless communication device are also disclosed.

Transmission power allocation

The present disclosure relates to a method () for determining scheduling assignments for reducing nonlinear signal distortion, performed in a network node of a wireless communications network. The network node comprises an antenna array arranged to perform beamforming. The method () comprises obtaining (S) channel state information, CSI, relating to respective channels between the network node and at least two wireless devices served by the network node. The method further comprises determining (S) precoding vectors to the at least two wireless devices based on the obtained CSI. The method also comprises determining (S) at least two frequency scheduling assignments for each of the at least two wireless devices. The method additionally comprises estimating (S), for each of the determined at least two frequency scheduling assignments, a respective transmitted nonlinear signal distortion to each of the at least two wireless devices based on the obtained CSI. The method yet further comprises selecting (S) a frequency scheduling assignment of the determined at least two frequency scheduling assignments based on the estimated transmitted nonlinear signal distortions. The present disclosure also relates to corresponding network nodes and computer programs.

Power amplifier-aware user scheduling

A method is disclosed of a wireless receiver configured for spatial selective reception. The method is for mitigation of an interfering signal leaked into a frequency range of a desired signal due to non-linearity of hardware components of the receiver. The method comprises receiving a composite signal comprising the desired signal and the interfering signal, filtering the composite signal using a spatial filter for a channel response of the desired signal to provide a first intermediate signal component, and filtering the composite signal using a spatial filter for a channel response of the interfering signal to provide a second intermediate signal component. The method also comprises estimating a squared amplitude of the interfering signal based on the second intermediate signal component and a model of the non-linearity, and estimating the desired signal based on the first intermediate signal component, the estimated squared amplitude of the interfering signal, and the model of the non-linearity. Corresponding apparatus, wireless receiver, wireless communication device and computer program product are also disclosed.

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Norrköping, Sweden

Christopher Mollén