Physical-layer sub-channel allocation method, emission system and receiving system

A technology of physical layer sub-channel and allocation method, applied in the fields of physical layer sub-channel allocation, transmitting system and receiving system

Inactive Publication Date: 2009-10-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the coding, constellation mapping, and interleaving methods adopted by each service in the implementation of the existing national standard are exactly the same, it is difficult to meet the above requirements

Method used

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  • Physical-layer sub-channel allocation method, emission system and receiving system
  • Physical-layer sub-channel allocation method, emission system and receiving system
  • Physical-layer sub-channel allocation method, emission system and receiving system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0143] Step A1. Divide the existing channel into basic channel units according to the sender parameters

[0144] According to the difference of system parameters at the sending end, especially the difference of the symbol interleaving parameter M, the basic channel unit can be taken as a group of interleaving frames or a group of sub-interleaving frames. Specifically:

[0145] For the case where the symbol interleaving parameter M=720 at the sending end, a group of interleaved frames or a group of sub-interleaved frames can be used as the basic channel unit.

[0146] If a group of interleaving frames is selected as a basic channel unit, first the interleaving frames are divided into 10 groups, denoted as I 0 1 , I 1 1 …I 9 1 ,in I i 1 = { F t Inter | t ≡ i mod ( 10 ...

Embodiment 2

[0171] A specific embodiment of the present invention will be given.

[0172] In this embodiment, the parameters of the sending end of the national standard system are as follows: the constellation map mapping method is 64QAM, the interleaving parameter M=240, the frame header adopts PN420 mode, and the LDPC code rate is 0.6. Now it is necessary to transmit an additional new service in this system, so a new physical layer sub-channel needs to be allocated for it.

[0173] Specific steps are as follows:

[0174] Step B1. Divide existing physical layer channels into basic channel units

[0175] Described in step A1., the basic channel unit is taken as a group of sub-interleaving frames, then the channel is divided into 10 third-type basic channel units, I 0 3 , I 1 3 …I 9 3 .

[0176] Step B2. Determine the required channel unit and make a reservation

[0177] The signal frame header of this system adopts PN420 mode, so each super frame contains 225 signal frames, corre...

Embodiment 3

[0187] Another specific embodiment of the present invention will be given.

[0188] In this embodiment, the parameters of the sending end of the national standard system are as follows: the constellation map mapping method is 16QAM, the interleaving parameter M=720, the frame header adopts PN945 mode, and the LDPC code rate is 0.8. Now it is necessary to additionally transmit two new services in this system, so two new physical layer sub-channels need to be allocated for it.

[0189] Specific steps are as follows:

[0190] Step C1. Divide existing channels into basic channel units

[0191] According to described in step A1., the basic channel unit is taken as a group of interleaving frames, then totally obtains 10 first-type basic channel units, I 0 1 , I 1 1 …I 9 1 .

[0192] Step C2. Determine the required channel unit and make a reservation

[0193] Since the signal frame header of the system in this embodiment adopts the PN945 mode, each superframe contains 200 si...

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Abstract

The invention relates to a physical-layer sub-channel allocation method, an emission system and a receiving system. Physical-layer channels are divided into a plurality of basic channel units on time or time and frequency; the basic channel units transmit data on corresponding divided time or/and frequency fragments; the needed basic channel units for transmitting newly added business are determined according to business demand and are reserved; the reserved basic channel units are merged into a newly added physical layer sub-channel assigned to the newly added business; and after basic business and the newly added business are coded and modulated respectively, the newly added business is transmitted in the newly added physical layer sub-channel, while the basic business is transmitted in the rest of the physical-layer channels. Under the circumstance of guaranteeing the complete compatibility with the prior national standard system, the invention has the advantages of providing the newly added business with enhanced code modulation besides the basic business, reducing the cost and power consumption of receivers and realizing complexity.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, and in particular relates to a physical layer sub-channel allocation method, a transmitting system and a receiving system for performing downlink multiple access and multiple service transmission in the existing Chinese digital TV terrestrial broadcasting transmission system. Background technique [0002] In August 2006, my country promulgated the national standard "Frame Structure, Channel Coding and Modulation of Digital TV Terrestrial Broadcasting Transmission System" (hereinafter referred to as the "national standard"), which began to be enforced on August 1, 2007. According to the national standard specification, the input data stream of the digital TV transmitter is firstly subjected to scrambling (randomization) and forward error correction coding (FEC); then the constellation mapping from the bit stream to the symbol stream is performed to obtain the basic data fra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L25/03H04L27/26H04L27/34
Inventor 彭克武邱石杨昉宋健李彦刚唐世刚
Owner TSINGHUA UNIV
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