Coherent averaging for measuring traveling wave tube amplifier nonlinearity

An average and characteristic technology, applied in the field of improving the curve measurement of traveling wave tube amplifiers, can solve the problem that the upper layer signal cancellation cannot be accurately realized

Active Publication Date: 2005-06-15
THE DIRECTV GROUP
View PDF1 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this regard, upper layer signal cancellation in layered mod

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
  • Coherent averaging for measuring traveling wave tube amplifier nonlinearity
  • Coherent averaging for measuring traveling wave tube amplifier nonlinearity
  • Coherent averaging for measuring traveling wave tube amplifier nonlinearity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0069] In the following description, reference is made to the accompanying drawings which form a part hereof, and illustrate by way of illustration several embodiments of the invention. It is understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the present invention.

[0070] 1 Overview

[0071] The present invention provides a method for determining / estimating an online non-linear measurement of TWTA. Coherent averaging technique maximizes processing gain for best TWTA AM-AM and AM-PM measurement accuracy. This technique does not establish a measurement floor in the low carrier-to-noise ratio (CNR) region which affects the estimation. Allowing measurement of the current TWTA nonlinearity from the layered modulation signal for compensation enables continuous layered modulation operation without service interruption and with best CNR performance. Additionally, a system design option is available for a single...

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

A method and system provide the ability to measure transmission performance characteristics. A signal is received and demodulated (1302). An ideal signal (1320) is generated (1304) from the demodulated signal. The received signal is coherently averaged (1324/1326) to reduce noise. The performance characteristic is the TWTA nonlinearity estimated from the difference between the coherently averaged ideal signal and the received signal.

Description

[0001] Cross References to Related Applications [0002] This application is a continuation-in-part and claims the benefit under 35 U.S.C. §120 of the following co-pending and commonly assigned utility patent application, which is hereby incorporated by reference: [0003] Utility Application Serial No. 09 / 844,401, entitled "LAYERED MODULATION FOR DIGITAL SIGNALS," filed April 27, 2001, by Ernest C. Chen, Attorney Docket No. PD-200181 (109.0051-US-01); and [0004] Ser. No. 10 / 165,710, titled "SATELLITE TWTA ON-LINE NON-LINEARITY MEASUREMENT," filed June 7, 2002 by Ernest C. Chen, attorney case number PD-200228 (109.0055-US-01) US application. [0005] Application serial number .PCT / US03 / 33130 by Ernest C. Chen and Shamik Maitra on October 17, 2003, titled "ESTIMATING THE OPERATION POINT ON ANONLINEAR TRAVELING WAVE TUBE AMPLIFIER", attorney case number PD-202131PCT(109.0099 - PCT International Patent Application for WO-U1). [0006] This application claims the benefit under ...

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
IPC IPC(8): H03F3/58H03FH04B1/10H04B7/185H04B17/00H04L27/227H04L27/36H04L27/38H04N7/24
CPCH04B1/1027H04L27/36H03F3/58
Inventor 欧内斯特·C.·陈
Owner THE DIRECTV GROUP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap