Interactive digital multimedia cable TV system

A technology of TV broadcasting and broadcasting system, applied in the direction of high-definition television system, two-way working system, cable transmission adaptation, etc.

Inactive Publication Date: 2003-02-19
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, COFDM uses iterative approximation algorithm, which has problems of convergence error and convergence time.

Method used

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  • Interactive digital multimedia cable TV system
  • Interactive digital multimedia cable TV system
  • Interactive digital multimedia cable TV system

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Embodiment Construction

[0044] The invention proposes an interactive wired digital multimedia television broadcast transmission method and system. It is designed to provide media services in cable television systems, including HDTV, audio, video, data broadcasting, and interactive multimedia services. Uplink 20Mb / s payload transmission code rate; highly flexible operation mode: by selecting different modulation schemes, the system can support services with different transmission conditions; high reliability: can resist pulse interference and reflection caused by mismatch; Excellent network security: Encryption and authorization control at the physical transport layer; support multiple transport / network protocols, easy to interface with other broadcast and communication systems, such as MPEG2, ATM and IP protocol sets; use proprietary technology to reduce peak Average power ratio; multiple operating modes, compatible with European DVB-C standard.

[0045] The main object of the present invention is c...

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Abstract

Interactive wire digit multimedia TV broadcast system characterizes that it is one of any broadcast systems of single or two-way, interactive independer of interactive channels. The down-stream interactive signals are applied of the down-stream channel TDS-OFDM while the up-line interactive signals are in the up-line channel of CDMA TDS-OFDM. The interactive interface of broadcast channel and interactive channel or the common interface of single way broadcast system independent of interactive channel are the top box nulti-transfer network protocols and compatible with Europen DVB-C standard.

Description

technical field [0001] An interactive cable digital multimedia television broadcasting system belongs to the technical field of digital information transmission, and in particular relates to an interactive cable digital multimedia / TV broadcasting (Interactive Cable Digital Multimedia / TV Broadcasting, DMB-IC) technical field. Background technique [0002] Due to multipath interference and distortion during the retransmission process of the information sequence, the signal generated by linear convolution will produce time dispersion and intersymbol interference (ISI). [0003] Currently, there are two effective technologies for eliminating intersymbol interference: time-domain equalization and orthogonal frequency division multiplexing (OFDM). Time-domain equalizer technology is relatively mature and widely used in various communication fields, but its structure is complex and costly; and it is only effective for ISI with short delay. When the delay of intersymbol interferenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/10H04N7/173
Inventor 杨林杨知行
Owner TSINGHUA UNIV
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