Unlock instant, AI-driven research and patent intelligence for your innovation.

Architecture of a low bandwidth predistortion system for non-linear RF components

A nonlinear and subsystem technology, applied in the direction of improving amplifiers to reduce nonlinear distortion, compensating memory effects for pre-distortion, transmission systems, etc., can solve nonlinear problems

Active Publication Date: 2014-10-22
TELEFON AB LM ERICSSON (PUBL)
View PDF11 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] All of the problems discussed above are caused by the non-linearity that filter 18 will exhibit when it is operated above a certain power level and in the region of its non-linear characteristic

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Architecture of a low bandwidth predistortion system for non-linear RF components
  • Architecture of a low bandwidth predistortion system for non-linear RF components
  • Architecture of a low bandwidth predistortion system for non-linear RF components

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] The embodiments set forth below represent the necessary information to enable one skilled in the art to practice the embodiments and exemplify the best mode of practicing the embodiments. Upon reading the following description in light of the accompanying drawing figures, those skilled in the art will understand the concepts of the disclosure and will recognize applications of these concepts not specifically addressed herein. It should be understood that these concepts and applications fall within the scope of the disclosure and the appended claims.

[0038] Systems and methods for compensating for nonlinearities of nonlinear subsystems using predistortion are disclosed. Before describing these systems and methods, it is instructive to first discuss the nonlinear characteristics of passive type filters. To be precise, image 3 The input-output characteristics of a typical passive type filter are illustrated. As illustrated, the output power of the filter (P OUT ) ca...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Systems and methods for compensating for non-linearity of a non-linear subsystem using predistortion are disclosed. In one embodiment, a system includes a non-linear subsystem and a predistorter configured to effect predistortion of an input signal of the non-linear subsystem such that the predistortion compensates for a non-linear characteristic of the non-linear subsystem. In addition, the system includes a narrowband filter that filters a feedback signal that is representative of an output signal of the non-linear subsystem to provide a filtered feedback signal, and an adaptor that adaptively configures the predistorter based on the filtered feedback signal and a reference signal that is representative of an input signal of the non-linear subsystem. By utilizing the filtered feedback signal, rather than the feedback signal, a complexity, and therefore, cost of the adaptor is substantially reduced.

Description

[0001] related application [0002] This application is related to U.S. Patent Application Serial No. 13 / 333,391, filed December 21, 2011, entitled "ARCHITECTURE OF NONLINEAR RF FILTER-BASED TRANSMITTER"; BANDWIDTH PREDISTORTION SYSTEM FOR NON-LINEAR RF COMPONENTS" US Patent Application Serial No. 13 / 333,422; both patent applications are commonly owned and assigned and are hereby incorporated by reference in their entirety. technical field [0003] The present disclosure relates to using predistortion to linearize nonlinear subsystems and, in many embodiments, to using predistortion to linearize nonlinear filters at the output of radio frequency transmitters. Background technique [0004] Every node in a communication network that wants to send data must have a transmitter. For example, in a cellular communication network there are transmitters in base stations as well as user equipment devices or terminals. figure 1 One embodiment of a conventional transmitter 10 is illus...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/04H03F1/32
CPCH03F3/245H03F1/3247H04B2001/0425H03F2201/3224H03F1/3258H04B1/0475H03F3/195H03F2201/3212H03F2201/3209H03F1/3241
Inventor 白春龙简春云E.西奇
Owner TELEFON AB LM ERICSSON (PUBL)