A Subregional Multi-qam Modulation System

A modulation system, sub-regional technology, applied in the field of radio and television

Inactive Publication Date: 2017-02-08
常熟市广播电视总台
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to: solve the problem of rational utilization of radio and television frequency point resources

Method used

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  • A Subregional Multi-qam Modulation System

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Embodiment Construction

[0019] like figure 1 As shown, the present invention adopts different QAM modulation modes for areas covered by different IPQAMs according to differences in network quality. For areas with good network quality, 256QAM modulation mode is adopted, and 64QAM mode is adopted for areas with poor network quality, so as to improve the utilization rate of frequency points and the utilization rate of IPQAM hardware resources.

[0020] System composition of the present invention comprises as follows:

[0021] (1) background management system;

[0022] According to the different quality of HFC network, set different QAM modulations such as 64QAM, 128QAM and 256QAM;

[0023] The background management system manages multiple IPQAM devices, and each IPQAM covers multiple areas. According to the network conditions of the area, the IPQAM outputs different QAM (256QAM, 128QAM, 64QAM) modulation signals;

[0024] (2) Radio and television HFC network;

[0025] Transmission of signals such as...

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Abstract

The invention discloses a regional multi-QAM (quadrature amplitude modulation) modulation system. Different QAD modulation modes are adopted as to different areas covered by IPQAMs (internet protocol quadrature amplitude modulation) according to the difference of network quality. A 256QAM modulation mode is adopted in the area with good network quality; and a 64QAM mode is adopted in the area with poor network quality. Thus, the utilization rate of frequency points and the utilization rate of IPQAM hardware resources are improved. Different IPQAM modulation modes are set in a background management system at the front end according to the coaxial cable network quality investigation of IPQAM coverage areas. Meanwhile, the QAM modulation mode is also set by IPQAM equipment according to the network quality. A user terminal obtains the QAM modulation mode adopted by the network after communicating with the background management system, and demodulates the signal by adopting the QAM modulation mode.

Description

technical field [0001] The invention relates to the technical field of broadcasting and television, in particular to a regional multi-QAM modulation system. Background technique [0002] QAM (Quadrature Amplitude Modulation) digital modulator, as the front-end equipment of the DVB system, receives TS streams from encoders, multiplexers, DVB gateways, video servers and other equipment, performs RS encoding, convolutional encoding and QAM digital modulation, and outputs The radio frequency signal can be transmitted directly on the cable TV network, and the intermediate frequency output can also be selected according to the need. With its flexible configuration and superior performance indicators, it is widely used in digital cable TV transmission field and digital MMDS system. [0003] The digital revolution has brought changes to HFC, and the dual convergence of media and network will completely change the structure and operation mode of the existing broadcasting and televis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/36
Inventor 陶希峰许伟波倪吉
Owner 常熟市广播电视总台
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