US 2020/0091979 A1 · MU-MIMO Precoder Design and Use for a Wideband MMIMO System with Constrained RF Chains in a Multi-Path Environment

Abstract

For a system with multiple Antenna Elements, AEs, to be used to transmit multiple symbols to multiple user equipments, UEs, and with multiple time sample positions, where the symbols occupy a time-frequency resource space and wherein at least some of the AEs are powered by constrained RF chains having functionalities that are simplified relative to full RF chains, precoder coefficients are generated for the multiple AEs taking into consideration multipath components of a signal to be transmitted from the multiple AEs to the multiple UEs. The generating forms precoder coefficients for individual ones of the constrained RF chains at corresponding certain time sample positions of the symbols. The signal is transmitted from the multiple AEs to the multiple UEs using FDMA at least by applying the generated precoder coefficients to the multiple AEs over the multiple time sample positions and time-frequency resource space of the symbols.

Claims28

Dependent claims

A method, comprising:

for a system with multiple antenna elements to be used to transmit multiple symbols to multiple user equipment and with multiple time sample positions, where the symbols occupy a time-frequency resource space and wherein at least some of the antenna elements are powered by constrained radio frequency chains having functionalities that are simplified relative to full radio frequency chains, generating precoder coefficients for the multiple antenna elements taking into consideration multipath components of a signal to be transmitted from the multiple antenna elements to the multiple user equipment, wherein the generating forms precoder coefficients for individual ones of the constrained radio frequency chains at corresponding certain time sample positions of the symbols;
and
transmitting the signal from the multiple antenna elements to the multiple user equipment using frequency division multiple access at least by applying the generated precoder coefficients to the multiple antenna elements over the multiple time sample positions and time-frequency resource space of the symbols.

An apparatus, comprising:

circuitry, for a system with multiple antenna elements to be used to transmit multiple symbols to multiple user equipment and with multiple time sample positions, where the symbols occupy a time-frequency resource space and wherein at least some of the antenna elements are powered by constrained radio frequency chains having functionalities that are simplified relative to full radio frequency chains, configured to generate precoder coefficients for the multiple antenna elements taking into consideration multipath components of a signal to be transmitted from the multiple antenna elements to the multiple user equipment, wherein the generating circuitry forms precoder coefficients for individual ones of the constrained radio frequency chains at corresponding certain time sample positions of the symbols;
and
circuitry configured to transmit the signal from the multiple antenna elements to the multiple user equipment using frequency division multiple access at least by applying the generated precoder coefficients to the multiple antenna elements over the multiple time sample positions and time-frequency resource space of the symbols.

Dependencies are inferred from the claim text.

MU-MIMO Precoder Design and Use for a Wideband MMIMO System with Constrained RF Chains in a Multi-Path Environment

Life of this patent

MU-MIMO Precoder Design and Use for a Wideband MMIMO System with Constrained RF Chains in a Multi-Path Environment

Life of this patent

Abstract

Claims28