US-12627322-B2 - Multi-antenna digital predistortion

US12627322B2US 12627322 B2US12627322 B2US 12627322B2US-12627322-B2

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, an apparatus may include first transceiver hardware comprising: first processing logic configured to generate a first plurality of output streams associated with a first sub-array of antenna elements of an antenna array by applying a first inverse power-amplifier-to-antenna-array network (A-1) matrix to one or more first input streams; and a first plurality of digital predistortion (DPD) circuits that are apply first DPD to the first plurality of output streams. The apparatus may include second transceiver hardware comprising: second processing logic configured to generate a second plurality of output streams associated with a second sub-array of antenna elements of the antenna array by applying a second A-1 matrix to second one or more input streams, and a second plurality of DPD circuits configured to apply second DPD to the second plurality of output streams.

Inventors

Jiri Stulemeijer
Bhushan Shanti Asuri
Andre ISIDORO PRATA
Evgeny Levitan
Ariel Yaakov Sagi
Ibrahim Ramez Chamas

Assignees

QUALCOMM INCORPORATED

Dates

Publication Date: 20260512
Application Date: 20240610

Claims (20)

1 . An apparatus for wireless communication comprising at least: first transceiver hardware comprising: first digital signal processing logic configured to: generate a first plurality of digital output streams that are associated with a first sub-array of antenna elements of an antenna array by applying a first inverse power-amplifier-to-antenna-array network (A-1) matrix to one or more first input digital streams associated with the first sub-array of antenna elements; and a first plurality of digital predistortion (DPD) circuits that are coupled to an output of the first digital signal processing logic and configured to: receive the first plurality of digital output streams from the first digital signal processing logic; and output first one or more DPD digital output streams that are associated with the first sub-array of antenna elements by applying first DPD to the first plurality of digital output streams; and at least second transceiver hardware comprising: second digital signal processing logic configured to: generate a second plurality of digital output streams that are associated with a second sub-array of antenna elements of the antenna array by applying a second A-1 matrix to second one or more input digital streams that are associated with the second sub-array of antenna elements, and a second plurality of DPD circuits that are coupled to the second digital signal processing logic and configured to: output second one or more DPD digital output streams that are associated with the second sub-array of antenna elements by applying second DPD to the second plurality of digital output streams.
2 . The apparatus of claim 1 , wherein the first A-1 matrix and the second A-1 matrix are based at least in part on the first sub-array of antenna elements being different from, and electrically isolated from, the second sub-array of antenna elements, and wherein the first sub-array of antenna elements includes a first border antenna element that is located adjacent to a second boarder antenna element included in the second sub-array of antenna elements.
3 . The apparatus of claim 1 , wherein the first A-1 matrix is independent from the second A-1 matrix.
4 . The apparatus of claim 1 , wherein the first A-1 matrix and the second A-1 matrix are based at least in part on: the first sub-array of antenna elements having a first set of border antenna elements that are adjacent to a second set of border antenna elements of the second sub-array of antenna elements of the antenna array, and the first set of border antenna elements having an isolation level between the second set of border antenna elements, the isolation level satisfying an isolation level threshold that indicates that an antenna crosstalk level between the first set of border antenna elements and the second set of border antenna elements is negligible.
5 . The apparatus of claim 4 , wherein the apparatus includes the first sub-array of antenna elements and the second sub-array of antenna elements, and wherein the isolation level between the first set of border antenna elements and the second set of border antenna elements is based at least in part on one or more standoff insulators.
6 . The apparatus of claim 1 , wherein the first transceiver hardware further comprises: first feed processing logic coupled to the first plurality of DPD circuits and configured to: generate first one or more baseband digital streams by applying a first inverse feed network (F-1) matrix to the first one or more DPD digital output streams, the first F-1 matrix being based at least in part on: a first feed network that is based at least in part on the first sub-array of antenna elements, and wherein the second transceiver hardware further comprises: second feed processing logic coupled to the second plurality of DPD circuits and configured to: generate second one or more baseband digital streams that are associated with the second sub-array of antenna elements by applying a second F-1 matrix to the second one or more DPD digital output streams, the second F-1 matrix being based at least in part on: a second feed network that is based at least in part on the second sub-array of antenna elements.
7 . The apparatus of claim 1 , wherein the first A-1 matrix is based at least in part on a first set of scattering parameters that characterize a first power-amplifier-to-antenna-array network that includes the first sub-array of antenna elements and does not include the second sub-array of antenna elements, and wherein the second A-1 matrix is based at least in part on a second set of scattering parameters that characterize a second power-amplifier-to-antenna-array network that includes the second sub-array of antenna elements and excludes the first sub-array of antenna elements.
8 . The apparatus of claim 1 , wherein the first A-1 matrix is based at least in part on mitigating first antenna crosstalk within the first sub-array of antenna elements, and wherein the second A-1 matrix is based at least in part on mitigating second antenna crosstalk within the second sub-array of antenna elements.
9 . The apparatus of claim 1 , wherein the first A-1 matrix and the second A-1 matrix are based at least in part on calibration data associated with the antenna array.
10 . The apparatus of claim 1 , wherein the apparatus includes more than two transceiver hardware segments, wherein the first transceiver hardware is a first transceiver hardware segment of the more than two transceiver hardware segments and the second transceiver hardware is a second transceiver hardware segment of the more than two transceiver hardware segments, and wherein each transceiver hardware segment of the more than two transceiver hardware segments includes: respective digital signal processing logic configured to generate a respective one or more digital output streams by applying a respective A-1 matrix to a respective one or more input digital streams associated with a respective sub-array of antenna elements of the antenna array, the respective A-1 matrix being based at least in part on a respective sub-array of antenna elements, and a respective plurality of DPD circuits that are coupled to the respective digital signal processing logic and configured to apply respective DPD to the respective one or more digital output streams.
11 . The apparatus of claim 1 , wherein the first A-1 matrix is configured to process the first one or more input digital streams as a respective narrowband signal of at least a first wideband signal.
12 . The apparatus of claim 1 , wherein the first A-1 matrix is configured to output, for each respective input digital stream of the first one or more input digital streams and as part of the first plurality of digital output streams: a respective forward digital stream, and a respective reverse digital stream.
13 . The apparatus of claim 12 , wherein the first plurality of DPD circuits are configured to: receive, as the first plurality of digital output streams, the respective forward digital stream and the respective reverse digital stream, wherein, to output the first one or more DPD digital output streams, the first plurality of DPD circuits are configured to process the respective forward digital stream and the respective reverse digital stream using a DPD kernel.
14 . The apparatus of claim 1 , wherein the first A-1 matrix is configured to process the first one or more input digital streams as at least: a first input digital stream of the first one or more input digital streams being a first narrowband signal that is included in a first wideband signal, and a second input digital stream of the first one or more input digital streams being a second narrowband signal that is included in in a second wideband signal, based at least in part on the first wideband signal and the second wideband signal sharing the first sub-array of antenna elements.
15 . The apparatus of claim 1 , wherein the first DPD is based at least in part on a first power-amplifier-to-antenna-array network that includes the first sub-array of antenna elements and excludes the second sub-array of antenna elements, and wherein the second DPD is based at least in part on a second power-amplifier-to-antenna-array network that includes the second sub-array of antenna elements and excludes the first sub-array of antenna elements.
16 . The apparatus of claim 1 , wherein the first transceiver hardware and the second transceiver hardware are co-located on an integrated circuit (IC) as two of a plurality of transceiver hardware included on the IC.
17 . A method performed by an apparatus, the method comprising: generating a first plurality of digital output streams that are associated with a first sub-array of antenna elements of an antenna array by applying a first inverse power-amplifier-to-antenna-array network (A-1) matrix to first one or more input digital streams associated with the first sub-array of antenna elements, the first A-1 matrix being based at least in part on the first sub-array of antenna elements; generating, using the first plurality of digital output streams, first one or more digital predistortion (DPD) digital output streams that are associated with the first sub-array of antenna elements by applying first DPD to the first plurality of digital output streams, the first DPD being based at least in part on a first power-amplifier-to-antenna-array network; generating a second plurality of digital output streams that are associated with a second sub-array of antenna elements of the antenna array by applying a second A-1 matrix to second one or more input digital streams that are associated with the second sub-array of antenna elements, the second A-1 matrix being based at least in part on the second sub-array of antenna elements; and generating second one or more DPD digital output streams that are associated with the second sub-array of antenna elements by applying second DPD to the second plurality of digital output streams, the second DPD being based at least in part on a second power-amplifier-to-antenna-array network that is different from the first power-amplifier-to-antenna-array network.
18 . The apparatus of claim 17 , wherein the first A-1 matrix and the second A-1 matrix are based at least in part on the first sub-array of antenna elements being different from, and electrically isolated from, the second sub-array of antenna elements, and wherein the first sub-array of antenna elements includes a first border antenna element that is located adjacent to a second boarder antenna element included in the second sub-array of antenna elements.
19 . The method of claim 17 , wherein the first A-1 matrix and the second A-1 matrix are based at least in part on: the first sub-array of antenna elements having a first set of border antenna elements that are adjacent to a second set of border antenna elements of a second sub-array of antenna elements of the antenna array, and the first set of border antenna elements having an isolation level between the second set of border antenna elements, the isolation level satisfying an isolation level threshold that indicates that an antenna crosstalk level between the first set of border antenna elements and the second set of border antenna elements is negligible.
20 . The method of claim 17 , wherein generating the first plurality of digital output streams and generating the first one or more DPD digital output streams is based at least in part on using first transceiver hardware that comprises: first digital signal processing logic configured to generate the first plurality of digital output streams, and a first plurality of DPD circuits that are coupled to an output of the first digital signal processing logic and configured to generate the first one or more DPD digital output streams using the first plurality of digital output streams, and wherein generating the second plurality of digital output streams and generating the second one or more DPD digital output streams is based at least in part on using second transceiver hardware that comprises: second digital signal processing logic configured to generate the second plurality of digital output streams, and a second plurality of DPD circuits that are coupled to the second digital signal processing logic and configured to generate the second one or more DPD digital output streams using the first plurality of digital output streams.

Description

FIELD OF THE DISCLOSURE Aspects of the present disclosure generally relate to wireless communication and specifically relate to techniques, apparatuses, and methods for multi-antenna digital predistortion. BACKGROUND Wireless communication systems are widely deployed to provide various services that may include carrying voice, text, messaging, video, data, and/or other traffic. The services may include unicast, multicast, and/or broadcast services, among other examples. Typical wireless communication systems may employ multiple-access radio access technologies (RATs) capable of supporting communication with multiple users by sharing available system resources (for example, time domain resources, frequency domain resources, spatial domain resources, and/or device transmit power, among other examples). Examples of such multiple-access RATs include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems. The above multiple-access RATs have been adopted in various telecommunication standards to provide common protocols that enable different wireless communication devices to communicate on a municipal, national, regional, or global level. An example telecommunication standard is New Radio (NR). NR, which may also be referred to as 5G, is part of a continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP). NR (and other mobile broadband evolutions beyond NR) may be designed to better support Internet of things (IoT) and reduced capability device deployments, industrial connectivity, millimeter wave (mmWave) expansion, licensed and unlicensed spectrum access, non-terrestrial network (NTN) deployment, sidelink and other device-to-device direct communication technologies (for example, cellular vehicle-to-everything (CV2X) communication), massive multiple-input multiple-output (MIMO), disaggregated network architectures and network topology expansions, multiple-subscriber implementations, high-precision positioning, and/or radio frequency (RF) sensing, among other examples. As the demand for mobile broadband access continues to increase, further improvements in NR may be implemented, and other radio access technologies such as 6G may be introduced, to further advance mobile broadband evolution. SUMMARY Some aspects described herein relate to an apparatus for wireless communication. In some aspects, the apparatus may include first transceiver hardware that comprises first digital signal processing logic configured to: generate a first plurality of digital output streams that are associated with a first sub-array of antenna elements of an antenna array by applying a first inverse power-amplifier-to-antenna-array network (A-1) matrix to one or more first input digital streams associated with the first sub-array of antenna elements. The first transceiver hardware may include a first plurality of digital predistortion (DPD) circuits that are coupled to an output of the first digital signal processing logic and configured to: receive the first plurality of digital output streams from the first digital signal processing logic; and output first one or more DPD digital output streams that are associated with the first sub-array of antenna elements by applying first DPD to the first plurality of digital output streams. The apparatus may include at least second transceiver hardware, and the second transceiver hardware may include second digital signal processing logic configured to: generate a second plurality of digital output streams that are associated with a second sub-array of antenna elements of the antenna array by applying a second A-1 matrix to second one or more input digital streams that are associated with the second sub-array of antenna elements. The second transceiver hardware may include a second plurality of DPD circuits that are coupled to the second digital signal processing logic and configured to: output second one or more DPD digital output streams that are associated with the second sub-array of antenna elements by applying second DPD to the second plurality of digital output streams. Some aspects described herein relate to an apparatus for wireless communication. In some aspects, the apparatus may comprise an antenna array that includes multiple antenna elements, one or more power amplifiers, each power amplifier being coupled to one or more antenna elements of the antenna array, and at least a first instance and a second instance of a DPD circuit. In some aspects, the apparatus includes first transceiver hardware that is coupled to at least a first power amplifier of the one or more power amplifiers and configured to drive at least a first portion of the antenna array.