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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
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In this regard, upper layer signal cancellation in layered modulation cannot be precisely achieved without nonlinear updates

Method used

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  • 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

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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...

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Abstract

A method and system provide the ability to measure a transmission performance characteristic. 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 estimated TWTA nonlinearity from a difference between the coherently averaged ideal signal and received signal. <IMAGE>

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

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Application Information

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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
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