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Method and apparatus for characterizing modulation schemes in an HFC network

A modulation scheme and network technology, applied in the direction of correct operation test, error detection/prevention using signal quality detector, etc., can solve expensive, manual, time-consuming and other problems, and achieve the effect of avoiding impact

Inactive Publication Date: 2008-11-05
GENERAL INSTR CORP
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Problems solved by technology

The problem with this diagnostic process is that the process is manual, time consuming and expensive

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  • Method and apparatus for characterizing modulation schemes in an HFC network
  • Method and apparatus for characterizing modulation schemes in an HFC network
  • Method and apparatus for characterizing modulation schemes in an HFC network

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Embodiment Construction

[0019] The present invention introduces an automated method to determine whether impairments such as phase noise and / or narrowband interference will significantly degrade the performance of upstream equipment, in conjunction with measurements made by CMTS equipment at the headend. In addition, the method determines the relative The maximum modulation complexity supported by the performance of the uplink HFC equipment. The method preferably uses only DOCSIS terminal equipment, in conjunction with measurements made at the headend by the DOCSIS CMTS equipment, without the need to run measurements or specialized test equipment at remote locations within the equipment.

[0020] There should preferably be enough headroom available in the network to allow the addition of two DOCSIS channels. Attorney Docket No. BCS04121, filed October 20, 2006, entitled METHOD AND APPARATUS FORDETERMINING THE TOTAL POWER MARGIN AVAILABLE FOR ANHFC NETWORK (METHOD FOR DETERMINING TOTAL POWER MARGIN AV...

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Abstract

The available modulation schemes of a network are analyzed to determine which ones contain excessive phase noise or narrowband interference. A network element is selected and assigned to a test channel at a first modulation scheme at a predetermined power level to achieve a predetermined PER. The network element transmits a test signal and the network controller measures the signal to noise ratio (SNR) in the received test signal. If the SNR is not within a predetermined tolerance range of an estimated SNR for the modulation scheme at the predetermined PER, the modulation scheme is determined to have excessive phase noise or narrowband interference. Each available modulation scheme is tested by instructing the network element to transmit the test signal using each modulation scheme and assigning the power level of each modulation scheme. The suitable modulation schemes may be determined.

Description

[0001] This application claims the benefit of U.S. Provisional Application US 60 / 863,068, filed October 26, 2006, entitled Method To Diagnose Phase NoiseAnd / Or Narrowband Interference Limitations Within An Upstream HfcPlant (Diagnosing Phase Noise And / Or Narrowband Interference Limitations Within An Upstream HFC Equipment and / or methods for narrowband interference limitation), which are hereby incorporated by reference in their entirety. technical field [0002] The present disclosure relates to characterizing modulation schemes in HFC networks. More specifically, the present invention relates to an automated method for analyzing available modulation schemes for phase noise and narrowband interference in HFC networks. Background technique [0003] Over the years, Hybrid Fiber Coaxial (HFC) cable TV systems have been widely used and a large number of networks have been developed. A typical HFC network usually includes headends that provide communication between users of the ...

Claims

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Application Information

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IPC IPC(8): H04L1/20H04L1/24
Inventor 罗伯特·J·汤普森迈克尔·J·库珀查尔斯·S·穆尔约翰·L·莫兰三世
Owner GENERAL INSTR CORP
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