Method and device for transmitting graded multiple services divided based on physical layer sub-channel

A physical layer sub-channel and transmission method technology, applied in the field of hierarchical multi-service transmission, can solve problems such as increased power consumption and cost, data confusion, inability to adapt to different users, differences between services and receiving equipment, and achieve the effect of reducing costs

Active Publication Date: 2009-11-25
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a hierarchical multi-service transmission method and device based on physical layer sub-channel division, so as to overcome the problem that the data from different services in the prior art are completely separated after the same encoding, constellation mapping, and interleaving. Mixed together, the user at the receiving end cannot only receive the required services, and the receiver is always in the working state, which increases its power consumption and cost; the coding, constellation mapping, and interleaving methods used by each service are exactly the same, and different services due to coverage or The defect that the demodulation signal-to-noise ratio threshold is the same and cannot adapt to the differences of different users, services and receiving equipment

Method used

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  • Method and device for transmitting graded multiple services divided based on physical layer sub-channel
  • Method and device for transmitting graded multiple services divided based on physical layer sub-channel
  • Method and device for transmitting graded multiple services divided based on physical layer sub-channel

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Embodiment 1

[0046] Embodiment 1: A hierarchical multi-service transmission method based on physical layer sub-channel division for the Chinese digital TV terrestrial broadcasting transmission standard. In this embodiment, the basic digital TV service of the national standard system (hereinafter referred to as the basic service) is set to adopt LDPC0.8 (6096, 7488) encoding, constellation mapping is 16QAM, interleaving depth M=720, single carrier mode, frame header mode PN420 Embedding new multimedia service (hereinafter referred to as new service) is mobile phone service, and its data rate is 384Kbps, adopts the error correction code LDPC0.4 (3048,7488) of national standard specification, constellation mapping is QPSK, interleaving depth M=48.

[0047] For the convenience of description, first combine the Figure 4 Provide necessary definitions and explanations for some definitions and concepts used below.

[0048] TS packet: that is, the transmission data packet. The information source ...

Embodiment 2

[0073]Embodiment 2: A hierarchical multi-service transmission method based on physical layer sub-channel division for the Chinese digital TV terrestrial broadcasting transmission standard. In this embodiment, the national standard system basic service setting adopts LDPC0.6 (4572, 7488) encoding, 64QAM constellation mapping, interleaving depth M=240, multi-carrier mode, frame header mode PN945; embedded new service is mobile phone service, Its data rate is 384Kbps, using national standard error correction code LDPC0.8 (6096, 7488), constellation mapping is QPSK, and slightly modified interleaving parameters B=52, M=48.

[0074] This embodiment includes the following steps:

[0075] Step 201, determining the structure and quantity of the basic payload unit according to the basic service transmission mode;

[0076] combine first Figure 8 Make necessary definitions and explanations for some definitions and concepts used below. At this time, each original frame contains three s...

Embodiment 3

[0090] Embodiment 3: A hierarchical multi-service transmission method based on physical layer sub-channel division for the Chinese digital TV terrestrial broadcasting transmission standard. In this embodiment, the basic digital TV service of the national standard system (hereinafter referred to as the basic service) is set to adopt LDPC0.8 (6096, 7488) encoding, the constellation map is 16QAM, the interleaving depth M=720, the multi-carrier mode, and the frame header mode PN420 ; The embedded new service 1 is a signaling signal, and its data rate is 10Kbps, using the error correction code LDPC0.4 (3048, 7488) standardized in the national standard, and the constellation map is BPSK without interleaving; the embedded new service 2 is mobile TV Business, its data rate is 384Kbps, using the error correction code LDPC0.4 (3048, 7488) specified in the national standard, the constellation map is QPSK, interleaving parameters B=52, M=48; its data rate is 384Kbps; embedded new services ...

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Abstract

The invention discloses a method for transmitting the graded multiple services divided based on physical layer sub-channel, including: determining the structure and amount of a basic payload unit according to the basic service transmission mode; forming a physical layer sub-channel by the basic payload unit according to the newly-increased service requirement; the newly-increased service data, after randomizing, coding, constellation mapping and interweaving, being inserted into the basic payload unit; executing the deinterweaving, demapping and the like for the data inserted into the basic payload unit to obtain the equivalent newly-increased service data packet; multiplexing the basic service data packet and the equivalent newly-increased service data packet according to the specific time sequence and transmitting the multiplexed signal by the international transmitter. The invention also discloses a device for transmitting the graded multiple services divided based on physical layer sub-channel, the multiple services transmission method provided by the invention, based on no influence on the primary basic service, can use the independent coding, constellation mapping and interweaving mode to flexibly set various service parameters so as to realize the graded transmission, with the electricity-saving function.

Description

technical field [0001] The invention relates to the technical field of digital information transmission, in particular to a hierarchical multi-service transmission method and device based on physical layer sub-channel division for the Chinese digital TV terrestrial broadcasting transmission standard. Background technique [0002] China's digital TV terrestrial broadcast transmission standard (hereinafter referred to as the national standard) is designed as a single-service system, that is, only one frame structure, channel coding and constellation mapping method are used in each frequency band. The transmitter block diagram of a typical Chinese digital TV terrestrial broadcasting transmission standard can be found in figure 1 , the input data code stream goes through a scrambler (randomization), forward error correction coding, and then performs constellation mapping from the bit stream to the symbol stream to form an original frame, and the original frame is interleaved to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/24H04N7/26H04N7/52H04L1/00
CPCY02B60/33Y02D30/50
Inventor 宋健杨昉彭克武王晓晴李彦刚唐世刚
Owner TSINGHUA UNIV
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