CN103269325B - Regional multi-QAM (quadrature amplitude modulation) modulation system - Google Patents
Regional multi-QAM (quadrature amplitude modulation) modulation system Download PDFInfo
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- CN103269325B CN103269325B CN201310221948.5A CN201310221948A CN103269325B CN 103269325 B CN103269325 B CN 103269325B CN 201310221948 A CN201310221948 A CN 201310221948A CN 103269325 B CN103269325 B CN 103269325B
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- ipqam
- qam
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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
The present invention relates to broadcasting and TV technical field, particularly to a kind of subregion many QAM modulation system.
Background technology
QAM（Quadrature Amplitude Modulation）Digital modulator as the headend equipment of DVB system,
Receive the TS stream of the equipment such as self-encoding encoder, multiplexer, DVB gateway, video server, carry out RS coding, convolutional encoding and QAM
Digital modulation, the radiofrequency signal of output can directly transmit on cable television network, simultaneously defeated also dependent on needing selection intermediate frequency
Go out.It, with its flexible configuration and superior performance indications, is widely used in digital cable TV transmission field and numeral
MMDS system.
Digitized revolution brings the change of HFC, and the dual fusion of media and network will thoroughly change existing wide from now on
Broadcast television system structure and operation mode.At present, radio, TV and film industries mainly use video distribution net and IPQAM technology in HFC net
VOD service is realized on network.Frequency bandwidth brings puzzlement as broadcasting and TV scarce resource to the extension of diversified business, and
The present invention can be good at solving the problems, such as above.
Content of the invention
Present invention aim at：Solve the problems, such as the reasonable utilization of broadcasting and TV frequency resource.
The technical solution adopted for the present invention to solve the technical problems is：The region that the present invention covers for different IPQAM,
According to the difference of network quality, using different qam modes.The region good to network quality, using 256QAM modulation methods
Formula, the region of difference adopts 64QAM mode, thus improving the utilization rate of frequency and the utilization rate of IPQAM hardware resource.
The system composition of the present invention includes as follows：
（1）Background management system；
According to the difference of hfc plant quality, it is set to the different QAM modulation such as 64QAM, 128QAM and 256QAM；
Background management system manages multiple IPQAM equipment, and each IPQAM covers multiple regions, network-like according to region
Condition is good and bad, the different QAM of IPQAM output（256QAM、128QAM、64QAM）Modulated signal；
（2）Broadcasting and TV hfc plant；
The qam mode that the decision of the signal such as transmission data and radio frequency, wherein coax network can adopt；
（3）IPQAM；
IP traffic is converted into radiofrequency signal output；
（4）User terminal；
Communicate with front end background management system, user is set eventually according to the QAM modulation parameter of background management system setting
End receives the QAM mode of radiofrequency signal, and completes the demodulation parsing of radiofrequency signal.
According to the coax network quality research of IPQAM overlay area, arrange not in the background management system of front end
Same IPQAM modulation system.Meanwhile, IPQAM equipment also arranges qam mode according to network quality.User terminal with rear
After platform communication, the qam mode that network residing for acquisition adopts, and signal is carried out using this qam mode
Demodulation.
Figure of description
Fig. 1 is the background management system structural representation of the present invention.
Specific embodiment
As shown in figure 1, the region that the present invention covers for different IPQAM, according to the difference of network quality, using different
Qam mode.The region good to network quality, using 256QAM modulation system, the region of difference adopts 64QAM mode, thus
Improve the utilization rate of frequency and the utilization rate of IPQAM hardware resource.
The system composition of the present invention includes as follows：
（1）Background management system；
According to the difference of hfc plant quality, it is set to the different QAM modulation such as 64QAM, 128QAM and 256QAM；
Background management system manages multiple IPQAM equipment, and each IPQAM covers multiple regions, network-like according to region
Condition is good and bad, the different QAM of IPQAM output（256QAM、128QAM、64QAM）Modulated signal；
（2）Broadcasting and TV hfc plant；
The qam mode that the decision of the signal such as transmission data and radio frequency, wherein coax network can adopt；
（3）IPQAM；
IP traffic is converted into radiofrequency signal output；
（4）User terminal；
Communicate with front end background management system, user is set eventually according to the QAM modulation parameter of background management system setting
End receives the QAM mode of radiofrequency signal, and completes the demodulation parsing of radiofrequency signal.
According to the coax network quality research of IPQAM overlay area, arrange not in the background management system of front end
Same IPQAM modulation system.Meanwhile, IPQAM equipment also arranges qam mode according to network quality.User terminal with rear
After platform communication, the qam mode that network residing for acquisition adopts, and signal is carried out using this qam mode
Demodulation.
Claims (1)
1. a kind of subregion many QAM modulation system it is characterised in that：Described system includes as follows：
(1) background management system；
According to the difference of hfc plant quality, it is set to 64QAM, 128QAM QAM modulation different with 256QAM；
Background management system manages multiple IPQAM equipment, and each IPQAM covers multiple regions, excellent according to the network condition in region
Bad, the different qam signal of IPQAM output, described QAM is 256QAM, 128QAM, 64QAM；
(2) broadcasting and TV hfc plant；
Transmission data and radiofrequency signal, wherein coax network determine the qam mode adopting；
(3)IPQAM；
IP traffic is converted into radiofrequency signal output；
(4) user terminal；
Communicate with front end background management system, user terminal is set according to the QAM modulation parameter of background management system setting and connects
Receive the QAM mode of radiofrequency signal, and complete the demodulation parsing of radiofrequency signal；
Described system adopts different qam modes；
Described system, according to the coax network quality research of IPQAM overlay area, sets in the background management system of front end
Put different IPQAM modulation systems；Meanwhile, IPQAM equipment also arranges qam mode according to network quality；User terminal exists
After communicating with background management system, the qam mode that network residing for acquisition adopts, and letter is carried out using this qam mode
Number demodulation；
The region covering for different IPQAM, according to the difference of network quality, using different qam modes；To network matter
Measured region, using 256QAM modulation system, the region of difference adopts 64QAM mode；Described background management system includes 1
IPQAM-1 and 1 IPQAM-X；IPQAM-1 overlay area A and region B；IPQAM-X overlay area C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310221948.5A CN103269325B (en) | 2013-06-05 | 2013-06-05 | Regional multi-QAM (quadrature amplitude modulation) modulation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310221948.5A CN103269325B (en) | 2013-06-05 | 2013-06-05 | Regional multi-QAM (quadrature amplitude modulation) modulation system |
Publications (2)
| Publication Number | Publication Date |
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| CN103269325A CN103269325A (en) | 2013-08-28 |
| CN103269325B true CN103269325B (en) | 2017-02-08 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1464655A (en) * | 2002-06-12 | 2003-12-31 | 电子科技大学 | New modulation method of OFDMA system |
| CN101212675A (en) * | 2006-12-29 | 2008-07-02 | 深圳市同洲电子股份有限公司 | Digital TV receiver region code management method |
| CN101645784A (en) * | 2008-10-22 | 2010-02-10 | 中国科学院声学研究所 | System and method for achieving business data multicast |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8437406B2 (en) * | 2007-11-12 | 2013-05-07 | Broadcom Corporation | Method and system for digital video broadcast for cable (DVB-C2) |
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2013
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1464655A (en) * | 2002-06-12 | 2003-12-31 | 电子科技大学 | New modulation method of OFDMA system |
| CN101212675A (en) * | 2006-12-29 | 2008-07-02 | 深圳市同洲电子股份有限公司 | Digital TV receiver region code management method |
| CN101645784A (en) * | 2008-10-22 | 2010-02-10 | 中国科学院声学研究所 | System and method for achieving business data multicast |
Non-Patent Citations (1)
| Title |
|---|
| 一种基于载噪比估计的自适应调制方法;韩瑜等;《http://www.tech-ex.com/article_images3/1/448771/4-15.pdf》;20090603;第398-401页正文第3-5节 * |
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| CN103269325A (en) | 2013-08-28 |
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Granted publication date: 20170208 Termination date: 20170605 |