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Digital broadcasting system and method

A digital and radio broadcasting technology, applied in the direction of digital transmission system, broadcast broadcasting, transmission system, etc., can solve problems such as distortion, communication waveform attenuation, high error rate, etc.

Inactive Publication Date: 2007-12-12
ITT MFG ENTERPRISES LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such obstructions attenuate and distort the communication waveform, resulting in high error rates for brief and longer periods of time

Method used

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  • Digital broadcasting system and method
  • Digital broadcasting system and method
  • Digital broadcasting system and method

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0040]Figure 5 shows a general example of the invention. At the transmitter, the source bits are input into a single encoder (501), where a set of output code bits is generated from the set of input code bits. For purposes of illustration, the entire set of output code points will be referred to as the complete set. The encoder sends the complete set to the code point decomposition (CBD) function (502). CBD decomposes the complete set into two critical subsets A and B. The subset is called critical because even if the receiver faithfully captures only one of the subsets, this is enough to recombine the original source bits. Subsets A and B may be completely disjoint (ie, not sharing common code points of the complete set), or may contain some common elements of the complete set. Note that the strict difference between the transmitter system in Figure 5 and that in Figure 2 is that the code bits transmitted on channels A and B are not the same.

[0041] At the receiver, eac...

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PUM

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Abstract

Apparatus and method of achieving diversity in reception of plural digital broadcast signals. A stream of a complete set of code bits is generated from one or more sources of data bits. A first Critical Subset of code bits is chosen or selected for a first channel (e.g. a specified puncturing pattern is applied to the stream of a complete set of code sets). A second (e.g. alternative) Critical Subset of code bits is chosen or selected for a second channel (e.g. a second or alternative puncturing pattern is chosen for the second channel). Further temporal diversity can be achieved. Moreover, the order of transmitting the code bits on each channel can be different (for example, the interleaving depths can be different). At the receiver, the stream of Critical Subsets of code bits for all of the channels are simultaneously received and a reconstruction of a complete set of code bits accomplished and the reconstructed code and may be inserted into a single Viterbi decoder. Various weighting functions and reconstruction algorithms are disclosed.

Description

technical field [0001] The present invention relates to digital broadcasting systems and methods which achieve multi-channel code diversity by means of decomposition of a single forward error correction code (FEC). Background technique [0002] A general strategy for reliably transmitting digital data over communication channels of varying quality is to transmit redundant information such that the transmitted stream of source bits can be recovered error-free at the receiver, even though the communication channel may be unstable. This is especially important for one-way broadcasts of audio and multimedia that must be received in real time with low error rates. In this case, the low error rate is achieved in part by the use of forward error correction (FEC) codes. [0003] Mobile satellite broadcasting is such an unstable channel, especially at lower elevation angles, since the line of sight (LOS) between the mobile vehicle and the satellite is often blocked by trees, buildin...

Claims

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Application Information

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IPC IPC(8): H04H1/00H04L1/00H04B7/02H04B7/185H04H20/00H04L1/02H04L1/06
CPCH04L1/0041H04B7/02H04L1/0071H04L1/0069H04L1/0059H04B7/18534H04L1/06H04L1/20
Inventor J·斯莫科姆
Owner ITT MFG ENTERPRISES LLC