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US 11,451,252 B2Granted
Digital predistortion for advanced antenna system
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorRaihan Rafique
Life of this patent
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Abstract
Systems and methods are disclosed herein that provide low-complexity Digital Predistortion (DPD) for a transceiver system that uses an Advanced Antenna System (AAS) to provide analog or hybrid beamforming.
Claims13
A system comprising:
- a digital predistortion subsystem adapted to predistort a baseband transmit signal x(t) based on an adaptation model to thereby provide a predistorted baseband transmit signal x′(t);
- and
- a beamforming front-end comprising:
- a plurality of transmit branches coupled to a plurality of transmit antenna elements, respectively, wherein the plurality of transmit branches is adapted to process the predistorted baseband transmit signal x′(t) to transmit a plurality of radio frequency transmit signals xRF,1(t) through xRF,N(t) via the plurality of transmit antenna elements, respectively;
- and
- a receive branch coupled to a receive antenna element, the receive branch configured to receive a combined receive signal y(t) comprising the plurality of radio frequency transmit signals xRF,1(t) through xRF,N(t) transmitted via the plurality of transmit antenna elements and received via the receive antenna element;
- wherein the digital predistortion subsystem is further adapted to:
- process the combined receive signal y(t) based on at least a plurality of known coupling factors (C1,j through CN,j) between the plurality of transmit antenna elements and the receive antenna element, respectively, to thereby provide a normalized receive signal ypp(t);
- and
- update the adaptation model based on a comparison of the normalized receive signal ypp(t) and the predistorted baseband transmit signal x′(t).
7 more elements
A method for providing digital predistortion in a radio node utilizing an Advanced Antenna System, AAS, and including a plurality of antenna elements for beamforming, comprising:
- predistorting a baseband input signal x(t) based on an adaptation model to thereby provide a predistorted baseband transmit signal x′(t);
- processing the predistorted baseband transmit signal x′(t) to transmit a plurality of radio frequency transmit signals xRF,1(t) through xRF,N(t) via a plurality of transmit antenna elements, respectively;
- receiving a combined receive signal y(t) comprising the plurality of radio frequency transmit signals xRF,1(t) through xRF,N(t) transmitted via the plurality of transmit antenna elements and received via a receive antenna element;
- processing the combined receive signal y(t) based on at least a plurality of known coupling factors (C1,j through CN,j) between the plurality of transmit antenna elements and the receive antenna element, respectively, to thereby provide a normalized receive signal ypp(t);
- and
- updating the adaptation model based on a comparison of the normalized receive signal ypp(t) and the predistorted baseband transmit signal x′(t).
3 more elements
A system for providing digital predistortion in a radio node utilizing an Advanced Antenna System, AAS, comprising a plurality of antenna elements to provide analog or hybrid beamforming, the system adapted to:
- predistort a baseband input signal x(t) based on an adaptation model to thereby provide a predistorted baseband transmit signal x′(t);
- process the predistorted baseband transmit signal x′(t) to transmit a plurality of radio frequency transmit signals xRF,1(t) through xRF,N(t) via a plurality of transmit antenna elements, respectively
- receive a combined receive signal y(t) comprising the plurality of radio frequency transmit signals xRF,1(t) through xRF,N(t) transmitted via the plurality of transmit antenna elements and received via the receive antenna element;
- receive a combined receive signal y(t) comprising the plurality of radio frequency transmit signals xRF,1(t) through xRF,N(t) transmitted via the plurality of transmit antenna elements and received via a receive antenna element;
- process the combined receive signal y(t) based on at least a plurality of known coupling factors (C1,j through CN,j) between the plurality of transmit antenna elements and the receive antenna element, respectively, to thereby provide a normalized receive signal ypp(t);
- and
- update the adaptation model based on a comparison of the normalized receive signal ypp(t) and the predistorted baseband transmit signal x′(t).
4 more elements
Dependencies are inferred from the claim text.