Linearization of Active Antenna Arrays

An active antenna and linearization technology, applied in the field of linearization, can solve the problems of hardware cost and complexity, increased complexity of transmission path linearization, service capacity and power efficiency degradation, etc., to achieve the effect of reducing signal processing.

Active Publication Date: 2021-09-07
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, as the number of active transceiver branches (i.e., transmit paths / radios) in an AAS increases, the complexity of linearizing all transmit paths increases significantly
It is clear that when coming to a transceiver branch above a certain number, the processing power and capacity for the linearizer exceeds that for other functionalities, and thus the traffic capacity as well as the power efficiency can be drastically reduced downgrade
Additionally, as the number of active transceiver branches in an AAS increases, the hardware cost and complexity associated with linearization becomes an issue

Method used

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  • Linearization of Active Antenna Arrays
  • Linearization of Active Antenna Arrays
  • Linearization of Active Antenna Arrays

Examples

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Embodiment Construction

[0027] Figure 1a is a schematic block diagram showing an exemplary predistorter according to the prior art. A predistorter works by adding a correction term to a signal (referred to below as the "raw input signal") before it is input to a distortion component to be linearized. exist Figure 1a , the distortion component is shown as a power amplifier. The correction term makes the resulting output from the power amplifier more similar to the original input signal than it would be if no correction term had been added. Ideally, the output signal from the distorting component will be the same as the input signal (but amplified in the case of a power amplifier), i.e. a predistorted signal being input to the distorting component results in an output signal identical to the original input signal (but amplified). is amplified in the case of PA). In other words, ideally, all distortions due to the distorting components cancel out and the system is perfectly linear.

[0028] The out...

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Abstract

A transmitter arrangement for linearization of an active antenna array and a method therein are provided. An active antenna array includes a plurality of antenna elements associated with a plurality of power amplifiers. The active antenna array is further associated with a precoder W having a number of input and 5 output ports. The method comprises obtaining a first signal X provided to an antenna array via a first input port of a precoder W 1 . The method further includes based on the first signal X 1 and based on X 1 Feedback from the plurality of antenna elements via the precoder W and propagation via the power amplifier adapts a predistortion linearizer connected to the first input port. 10 Embodiments are also provided for multiple input signals based on X 1 、X 2 etc. and feedback from multiple antenna elements to adapt the predistortion linearizer.

Description

technical field [0001] The invention applies to the technical field of linearization of power amplifiers, and in particular to power amplifiers operating in active antenna arrays. Background technique [0002] A radio frequency power amplifier is a type of electronic amplifier used to convert a low power radio frequency signal into a larger signal of high power, typically to drive a transmitter's antenna. Typically optimized to have high efficiency, high output power (P1dB) compression, good return loss on input and output, good gain, and best heat dissipation. [0003] A radio transmitting in the downlink in a communication system is typically designed to deliver a predetermined power level to an antenna which in turn is designed to radiate in a certain direction towards some user equipments (UEs). In doing so, the signal is usually simultaneously required to have a certain quality and, in a system perspective, the leakage in adjacent channels / frequencies (spectral, or spa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/04
CPCH04B2001/0425H03F1/3241H04B1/0475H03F1/32H03F1/3276H03F1/3247
Inventor B.乔汉斯森F.格哈塞姆扎德J.蒂尔伯格L.雷克伯格
Owner TELEFON AB LM ERICSSON (PUBL)
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