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Framing structure for digital broadcasting and interactive services

A technology for framing and broadcasting signals, used in digital transmission systems, data representation error detection/correction, error correction/detection using block codes, etc., which can solve problems such as complex decoding and unique word length overhead.

Active Publication Date: 2005-06-22
DTVG LICENSING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this technique is that the unique word must be very long (that is, the overhead is large)
Another disadvantage is that true maximum likelihood decoding of BCH codes is quite complex

Method used

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  • Framing structure for digital broadcasting and interactive services
  • Framing structure for digital broadcasting and interactive services
  • Framing structure for digital broadcasting and interactive services

Examples

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Embodiment Construction

[0032] An apparatus, method and software for efficiently providing frame synchronization in a digital broadcasting system will be described below. In the following description, for purposes of clarity, numerous specific details are given in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced without these specific details or with an equivalent arrangement. In other instances, well-known structures and devices are shown in block diagram form in order not to unnecessarily obscure the invention itself.

[0033] FIG. 1 is a configuration diagram of a digital broadcasting system using a Low Density Parity Check (LDPC) code designed according to an embodiment of the present invention. The digital communication system 100 includes a digital transmitting device 101 for generating signal waveforms for broadcasting over a communication channel 103 to one or more digital modems 10...

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PUM

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Abstract

An approach is provided for supporting frame synchronization in a digital broadcast and interactive system. A transmitter (200) includes an encoder (203, 309) that outputs a Low Density Parity Check (LDPC) codeword. The transmitter (200) also includes a framing module generates a LDPC coded frame in response to the LDPC codeword, and appends a physical layer signaling field to the LDPC codeword for specifying modulation and coding information associated with the LDPC coded frame. The physical layer signaling field is encoded with a Forward Error Correction (FEC) code and has an embedded framing structure to assist with frame synchronization. The above arrangement is particularly suited to a digital satellite broadcast system (100).

Description

technical field [0001] The present invention relates to communication systems, in particular to digital communication systems. Background technique [0002] Broadcasting systems have accepted the need for high quality transmissions using digital technology. The digital revolution has changed the way broadband services, including audio and video programming and data transmission, are delivered. Satellite communication systems appear as a viable solution to support such broadband services. Thus, it is highly desirable that the modulation and coding be efficient in both power and bandwidth so that the satellite communication system can provide reliable communication in the presence of relatively noisy communication channels. In broadcast applications supported by such systems, fast frame synchronization in low signal-to-noise ratio (SNR) environments needs to be employed in order to avoid negative impact on user perception and to efficiently utilize system resources. [0003...

Claims

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Application Information

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IPC IPC(8): H03M13/09H03M13/15H03M13/19H03M13/33H04L1/00H04L7/00H04L7/04H04L7/08H04L27/00H04L27/227H04L27/36H04L27/38H04N7/015H04N7/20
CPCH04L1/0057H04L7/048H04L27/2272H04L2027/0028H04L2027/0055H04L2027/0067H04L2027/0093H04L2027/0095H04N7/015
Inventor 孙凤文李琳南
Owner DTVG LICENSING INC
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