CN101562502B - Physical-layer sub-channel allocation method, emission system and receiving system - Google Patents

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

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CN101562502B
CN101562502B CN2009100852299A CN200910085229A CN101562502B CN 101562502 B CN101562502 B CN 101562502B CN 2009100852299 A CN2009100852299 A CN 2009100852299A CN 200910085229 A CN200910085229 A CN 200910085229A CN 101562502 B CN101562502 B CN 101562502B
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channel
added business
module
frame
basic
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CN101562502A (en
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彭克武
邱石
杨昉
宋健
李彦刚
唐世刚
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Tsinghua University
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Tsinghua University
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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

A kind of physical-layer sub-channel allocation method, emission system and receiving system
Technical field
The invention belongs to digital information transmission technical field, particularly a kind of physical-layer sub-channel allocation method, emission system and receiving system of in existing China Digital TV ground broadcast transfer system, carrying out downlink multi-access multi-service transmission.
Background technology
China has issued in August, 2006 and " digital television ground broadcast transmission system frame structure, chnnel coding and modulation " national standard (hereinafter to be referred as " GB ") has begun to put teeth on August 1st, 2007.According to gb specification, the input data bitstream of DTV transmitting terminal stream at first passes through scrambler (randomization), forward error correction coding (FEC); The constellation mapping of carrying out flowing to from bit symbols streams then obtains the master data frame; Carry out time domain (be interframe symbol convolutional interleave, or the claim symbol interleaving) back that interweaves again and form interlacing frames; After interlacing frames and the system information combination (multiplexing), form frame through the frame data processing; And frame is signal frame (framing) with corresponding frame head (PN sequence) multiple connection, converts baseband output signal (in the 8MHz bandwidth) into through baseband postprocessing.This signal converts radiofrequency signal (in UHF and the VHF band limits) into and launches through quadrature up-conversion.Whole emission system block diagram is as shown in Figure 1.
In the real figure television terrestrial broadcasting is used, in order to utilize frequency spectrum resource more efficiently, the transmission channel of (or a plurality of) Added Business need be provided outside existing basic service, promptly realize the multi-service transmission.In the European second generation terrestrial DTV transmission standard DVB-T2 that announces in June, 2008; Introduced physical layer pipe (PLP) and supported the multi-service transmission in the same physical channel, each physical layer pipe can be carried out independently pipe interior service integration, coding, modulates and interweave etc.; And support the receiver demodulation through physical layer signaling.Receiver at first demodulation is analysed physical layer signaling, knows the multiplexing and demodulating information of each physical layer pipe, then the business datum in the required physical layer pipe is carried out demodulation.And in the enforcement of existing GB, a plurality of business can only be that unit carries out the multiplexing of TS package level in a unique input data bitstream stream of transmitting terminal with the TS bag.Data from different business are being mingled in together through coding, constellation mapping with after interweaving fully; Therefore receiving terminal can only be after carrying out demodulation to all TS bags; Could accomplish each professional demultiplexing, distinguish the packet of different business usually through the pid information of TS bag.The service integration of this TS package level has following two major defects.On the one hand, even the user only need belong to the data of some Added Business, the Added Business receiver also must receive and demodulation all professional data, makes that receiver must be in running order at All Time, has increased power consumption and receiver cost.On the other hand; Different service usually to different users, different service and different received equipment (like fixed receiver; Hand receiver etc.), coverage or the demodulation signal-noise ratio threshold that therefore requires different business to some extent difference to adapt to the difference of different user, service and receiving equipment.But, thereby be difficult to satisfy above requirement because each professional coding, constellation mapping and interleaving mode that adopts is identical in existing GB is implemented.
Summary of the invention
In order to overcome the above defective of existing state mark system when carrying out the multi-service transmission; The purpose of this invention is to provide a kind of physical-layer sub-channel allocation method, emission system and corresponding receiving system; Under the complete compatible situation of assurance and existing state mark system; Added Business with enhance encoding and modulation is provided outside basic service, when improving transmission performance, reduces receiver cost, power consumption and implementation complexity.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
The invention provides a kind of physical-layer sub-channel allocation method that is used for the terrestrial broadcasting transmission; Be applicable to the digital tv ground broadcasting of standard in " GB 20600-2006 digital television ground broadcast transmission system frame structure, chnnel coding and modulation " national standard; When transmitting terminal has Added Business to transmit, may further comprise the steps:
S1 is divided into several basic channel units with physical layer channel on time or Time And Frequency, basic channel unit in the corresponding time of being divided or/and Time And Frequency fragment transmitting data;
S2 preengages based on business demand definite transmission required basic channel unit of Added Business and to it;
S3 merges into the basic channel unit of reservation newly-increased physical-layer sub-channel and distributes to Added Business;
S4 after basic service and Added Business encoded respectively and modulate, transmits Added Business in newly-increased physical-layer sub-channel, basic service is transmitted in all the other physical layer channel.
Preferably, among the step S1, the division of corresponding all sub-interlacing frames of transmitting terminal of the division of said physical layer channel or newly-increased physical-layer sub-channel or interlacing frames, said basic channel unit is used for transmitting sub-interlacing frames or interlacing frames is divided the data of dividing into groups in the back;
Step S2 comprises substep:
S21 accomplishes the division to LDPC frame or the grouping of master data frame according to the dividing mode of sub-interlacing frames or interlacing frames;
S22 according to the transmission rate of Added Business, confirms required basic channel unit, and the grouping in LDPC frame or the master data frame is preengage;
Step S4 comprises substep:
S41 encodes and modulates basic business data, obtains basic service LDPC frame or by its master data frame of forming;
S42 encodes and modulates the Added Business data, obtains Added Business LDPC frame or by its master data frame of forming;
S43 is filled in the LDPC frame or the grouping of master data frame of not reservation with basic service LDPC frame or by the master data frame that it is formed;
S44 is filled in the LDPC frame or the grouping of master data frame of reservation with Added Business LDPC frame or by the master data frame that it is formed, and accomplishes the multiple connection of Added Business and basic service;
S45 carries out subsequent treatment with the master data frame complex data that obtains after the multiple connection and obtains radiofrequency signal, and this radiofrequency signal is transmitted on physical layer channel.
Preferably, if during the symbol interleaving parameter M=720 of transmitting terminal:
In step S1, the number of basic channel unit is 10, and the interlacing frames of transmitting terminal is divided into 10 groups, and basic channel unit is used for transmitting interlacing frames and divides the data of dividing into groups in the back;
Or in step S1; The number of basic channel unit is 5L, and the sub-interlacing frames of all of transmitting terminal is divided into the 5L group, and basic channel unit is used for transmitting sub-interlacing frames and divides the data of dividing into groups in the back; The constellation mapping pattern decision of being adopted when wherein L is modulated by transmitting terminal, 2 LBe counting of planisphere.
Preferably, during as if transmitting terminal symbol interleaving parameter M=240,
Among the step S1, the number of basic channel unit is 10, and all sub-interlacing frames of transmitting terminal are divided into 10 groups, and basic channel unit is used for transmitting sub-interlacing frames and divides the data of dividing into groups in the back.
Preferably, between receiving terminal and the transmitting terminal all newly-increased physical-layer sub-channel parameters are arranged in this method;
Perhaps, a newly-increased physical-layer sub-channel is set to be used for the signaling channel of command transmitting, and said signaling comprises all newly-increased physical-layer sub-channel parameters, only the signaling channel parameter is arranged between receiving terminal and the transmitting terminal.
Preferably, among the step S42 Added Business data are encoded and modulation comprises following substep:
S421 ' carries out outer error correction coding with the Added Business incoming bit stream and seals dress with the TS that meets the GB pattern of the input, obtains Added Business equivalence TS input packet;
S422 ', the randomization, Bose-Chaudhuri-Hocquenghem Code, the LDPC that Added Business equivalence TS input packet are met successively gb specification encode, and obtain Added Business LDPC code word;
S423 ' carries out repeated encoding to Added Business LDPC code word;
S424 ' carries out planisphere mapping or planisphere expansion mapping with the output behind the repeated encoding, obtains the LDPC frame or by its master data frame of forming.
Preferably, the method for planisphere expansion mapping is among the step S424 ': keep the invariant position of planisphere inner constellation point,
The constellation point on planisphere border that will be except that the summit is expanded according to setting factor a to the outside on border, place;
To each summit, expand according to setting factor a to the outside on two borders at its place simultaneously, wherein a＞0.
The present invention also provides a kind of emission system of using above-mentioned physical-layer sub-channel allocation method, and this emission system comprises:
Physical layer channel is divided module, be used for physical layer channel is divided into several basic channel units on time or Time And Frequency, basic channel unit time that correspondence is divided or/and Time And Frequency fragment transmitting data;
Scheduler module; Confirm the transmission required basic channel unit of Added Business and it is preengage based on transmitter parameter and system business demand; The basic channel unit of reservation is merged into newly-increased physical-layer sub-channel and distributed to Added Business, the schedule information when producing basic service coding and modulation, Added Business coding with modulation and basic service and Added Business multiple connection;
Transport module after being used for basic service and Added Business encoded respectively and modulate, transmits Added Business according to said schedule information in newly-increased physical-layer sub-channel, basic service is transmitted in all the other physical layer channel.
Preferably, this emission system also comprises:
Sub-interlacing frames or interlacing frames are divided module, are used to adopt the dividing mode corresponding with the division of physical layer channel that all sub-interlacing frames of transmitting terminal or interlacing frames are divided, take said basic channel unit during transmitted in packets after dividing;
LDPC frame or master data frame are divided module, are used for accomplishing the division to LDPC frame or the grouping of master data frame according to the dividing mode of sub-interlacing frames or interlacing frames;
Said scheduler module also comprises LDPC frame or master data frame reservation module, is used for the transmission rate according to Added Business, preengages required basic channel unit, and the grouping in LDPC frame or the master data frame is preengage;
Said transport module further comprises:
The basic service code modulation module is used for basic business data is met the coding and the modulation of gb specification, obtains basic service LDPC frame or by its master data frame of forming;
The Added Business code modulation module is used for the Added Business data are carried out the enhance encoding and the modulation of compatible GB, obtains Added Business LDPC frame or by its master data frame of forming;
The multiple connection module; Be used for being filled into basic service LDPC frame or by the master data frame that it is formed the LDPC frame or the grouping of master data frame of not reservation according to schedule information; Be filled in the LDPC frame or the grouping of master data frame of reservation with Added Business LDPC frame or by the master data frame that it is formed, accomplish the multiple connection of Added Business and basic service;
The subsequent treatment module is carried out subsequent treatment with the master data frame complex data that obtains after the multiple connection and is obtained radiofrequency signal, and this radiofrequency signal is transmitted on physical layer channel.
Preferably, this emission system comprises parameter agreement module, is used for receiving terminal all newly-increased physical-layer sub-channel parameters being arranged;
Or comprise signaling parameter agreement module, signaling and professional multiple connection module, wherein
Signaling and professional multiple connection module are used for that signaling and one road Added Business are carried out multiple connection and obtain one tunnel compound Added Business, and signaling comprises all newly-increased physical-layer sub-channel parameters;
Signaling parameter agreement module, be used for and receiving terminal between the shared channel parameter of signaling transmission is arranged.
Preferably, said Added Business code modulation module comprises:
Outer error correction coding module is used for the Added Business incoming bit stream is carried out outer error correction coding;
TS seals the dress module, and the TS that is used for after error correction coding the Added Business incoming bit stream is met pattern of the input seals dress, obtains Added Business equivalence TS input packet;
Input interface module is accomplished the rate adapted to Added Business equivalence TS input packet;
The randomization module is used for Added Business equivalence TS input packet is carried out scrambler;
The forward error correction coding module is used for Added Business equivalence TS input packet is carried out Bose-Chaudhuri-Hocquenghem Code and LDPC coding, obtains Added Business LDPC code word;
The repeated encoding module is used for Added Business LDPC code word is carried out repeated encoding;
The planisphere mapping block is used for planisphere mapping or planisphere expansion mapping are carried out in the output behind the repeated encoding, obtains the LDPC frame or by its master data frame of forming;
Cache module; Be used for buffer memory basic service code modulation module obtains under the control of schedule information basic service LDPC frame or by its master data frame of forming, and the Added Business code modulation module obtains Added Business LDPC frame or by its master data frame of forming.
Said subsequent treatment module comprises interleaving block, is used for corresponding sub-interlacing frames or the interlacing frames of forming behind LDPC frame or the master data frame process interframe symbol convolutional interleave.
The present invention also provides a kind of receiving system corresponding to above-mentioned emission system, and this receiving system comprises:
Parameter agreement module is used for receiving terminal all newly-increased physical-layer sub-channel parameters being arranged; Or comprise signaling parameter agreement module and signal demodulation module, wherein, signaling parameter agreement module, be used for and receiving terminal between signaling transmitted shared signaling channel parameter arrange; The signal demodulation module, under the control of control module, signaling channel parameter is according to a preconcerted arrangement carried out demodulation to signaling channel, to obtain the newly-increased physical-layer sub-channel parameter that comprises in the signaling;
Synchronously, channel estimating and channel equalization module, be used to accomplish to received signal synchronously, channel estimating and channel equalization, obtain through data symbol, channel condition information and synchronizing information after balanced;
Control module is used for the timing control signal according to said synchronizing information and the whole receiving system of said physical-layer sub-channel parameter generating;
Professional demodulation module under the control of control module, carries out demodulation to the physical-layer sub-channel that comprises required Added Business.
Utilize physical-layer sub-channel allocation method provided by the invention, emission system and receiving system, have following beneficial effect
1) each newly-increased physical-layer sub-channel takies different time and frequency resource regularly in transmission, and receiving terminal can be easily makes a distinction the business datum of required physical-layer sub-channel, and need not to receive the transmission data all with demodulation;
2) physical-layer sub-channel of each newly-increased physical-layer sub-channel and original basic service is independent; Can adopt different measure to obtain bigger coverage, lower demodulation signal-noise ratio threshold etc. according to needs separately, make Added Business can really satisfy specific receiving terminal demand.
3) business of transmitting in the newly-increased physical-layer sub-channel does not produce any influence to existing basic service; Thereby realize complete compatibility to existing GB and receiving system thereof; Under the complete compatible situation of existing state mark system; Added Business with enhance encoding modulation is provided outside basic service, and has reduced receiver cost, power consumption and implementation complexity;
4) physical-layer sub-channel allocation method provided by the invention can be used for similar terrestrial broadcast system applied environment.
Description of drawings
Fig. 1 is the principle and the structured flowchart of transmitting terminal in the existing China Digital TV ground broadcast transfer system;
Fig. 2 is for transmitting terminal is with LDPC code check 0.6 in the existing China Digital TV ground broadcast transfer system, and constellation mapping 64AQM is a data corresponding relation sketch map between the example various processes;
Fig. 3 is first kind basic channel unit I in the embodiment of the invention 1 0 1The running time-frequency resource sketch map that in transmission, takies;
Fig. 4 is for being mapped as second type of basic channel unit I of example with the 16QAM planisphere in the embodiment of the invention 1 0 2The running time-frequency resource sketch map that in transmission, takies;
Fig. 5 is for being mapped as the 3rd type of basic channel unit I of example with the 64QAM planisphere in the embodiment of the invention 1 0 3The running time-frequency resource sketch map that in transmission, takies;
Fig. 6 is the coding and modulation flow chart of Added Business data in the embodiment of the invention 1;
Fig. 7 is a planisphere extended method sketch map in the embodiment of the invention 1;
The ground digital television broadcast emission system implement device figure of Fig. 8 for having the physical-layer sub-channel distribution function in the embodiment of the invention 1;
Fig. 9 a is a basic service code modulation module structure chart in the embodiment of the invention 1;
Fig. 9 b is an Added Business code modulation module structure chart in the embodiment of the invention 1;
Fig. 9 c is master data frame subsequent treatment modular structure figure in the embodiment of the invention 1;
Figure 10 is a ground digital television broadcast receiving system implement device structure chart in the embodiment of the invention 1;
Figure 11 is signaling or a professional demodulation module structural representation in the embodiment of the invention 1;
Figure 12 takies the running time-frequency resource sketch map for newly-increased physical-layer sub-channel in the embodiment of the invention 2 in transmission;
Figure 13 is the 64QAM planisphere after the expansion in the embodiment of the invention 2;
The running time-frequency resource sketch map that Figure 14 takies in transmission for newly-increased physical-layer sub-channel in the embodiment of the invention 3;
Figure 15 is the 16QAM planisphere after the expansion in the embodiment of the invention 3.
Embodiment
For making the object of the invention, content and advantage clearer, embodiment of the present invention is done to describe in detail further below in conjunction with accompanying drawing.
The present invention proposes a kind of feasible physical-layer sub-channel allocation method, emission system and corresponding receiving system.This method marks off the transfer of data that (or a plurality of) physical-layer sub-channel (below be called " newly-increased physical-layer sub-channel ") carries out Added Business from the whole transmission channel (physical layer channel) that originally supplies basic service to use fully under the framework of existing state mark system.
In order to narrate conveniently, some notions that at first combine Fig. 2 that the present invention is used are carried out necessary definition and explanation.
Data symbol: the complex symbol that the data bit that forward error correction coding produces obtains after shining upon through planisphere.
The master data frame: input TS bit stream is the data symbol block of 3744 symbols through the length that scrambler, forward error correction coding, planisphere mapping back form.
The LDPC frame: a master data frame is made up of several (depending on the planisphere mapping mode) LDPC coded identification pieces, and wherein each LDPC coded identification piece is called a LDPC frame, and its length is determined by the planisphere mapping mode.For example to the mapping of 64QAM planisphere, the length of a LDPC frame is 3744/3=1248 symbol.
Interlacing frames: the length that forms behind the master data frame process interframe symbol convolutional interleave is the data symbol block of 3744 symbols.
Sub-interlacing frames: each interlacing frames is split as the size data symbol block identical with the LDPC frame successively, and then each data symbol block is defined as a sub-interlacing frames.
Signal frame: the elementary cell of multistage multi-frame structure, form by frame head and frame, by interlacing frames through with multiplexing, the frame data processing of system information and with the frame head multiple connection after obtain.
T F: the time span of each signal frame is frame partial-length and frame head partial-length sum.Wherein the length of frame part is fixed as 500us, and when frame head mode was selected, its length also immobilized, and for example, is the pattern of 420 symbols to frame head length, and signal frame length is fixed as 555.6us.
Symbol interleaving parameter M: expression interleave depth (delay buffer storage size), see " GB20600-2006 digital television ground broadcast transmission system frame structure, chnnel coding and modulation ".
Basic channel unit: obtain in time or last division of Time And Frequency (being called for short " time-frequency ") by existing physical layer channel; The sign field of one group of regular distribution in the corresponding interlacing frames; It takies some time or Time And Frequency fragment regularly when Channel Transmission, be the least unit of forming physical-layer sub-channel.
Newly-increased physical-layer sub-channel: a subchannel of opening up in the existing GB system physical layer channel, it takies different time or time and frequency resource regularly in transmission, can be received end and on physical layer frame structure, distinguish.The newly-increased physical-layer sub-channel that the present invention refers in particular to is made up of basic channel unit.
With the master data frame, the LDPC frame, interlacing frames is numbered respectively with sub-interlacing frames, the n frame is designated as respectively: F n Basic, F n LDPC, F n Inter, F n Sub
The present invention comprises following rapid corresponding to a kind of physical-layer sub-channel allocation method that in existing China Digital TV ground broadcast transfer system (being called for short state's mark system), utilizes newly-increased physical-layer sub-channel to carry out the multi-service transmission of said GB emitter:
Steps A 1. will have physical layer channel now according to initiator parameters and on time or temporal frequency, be divided into several basic channel units, basic channel unit in the corresponding time of being divided or/and Time And Frequency fragment transmitting data;
Time location that data symbol takies in Channel Transmission (single carrier mode) or time-frequency position (multi-carrier mode, i.e. OFDM pattern) are by its determining positions in the signal frame frame.According to GB, the time domain data symbol (single carrier mode) of signal frame frame part (not comprising system information) or frequency domain data symbol (multi-carrier mode) are to be shone upon one by one according to fixing mode by the data symbol in the interlacing frames.Therefore, keeping under the constant situation of the multistage multi-frame structure of GB, can equivalence be division and the distribution to interlacing frames to the division of channel running time-frequency resource with distributing fully.Thereby the present invention defines basic channel unit and newly-increased physical-layer sub-channel at the interlacing frames place.The division of corresponding all sub-interlacing frames of transmitting terminal of the division of said physical layer channel or interlacing frames, said basic channel unit is used for transmitting sub-interlacing frames or interlacing frames is divided the data of dividing into groups in the back.
The sign field of one group of regular distribution in the corresponding transmission of the basic channel unit state mark system interlacing frames; Can think that basic channel unit is the sign field of one group of regular distribution in state's mark system interlacing frames, it clocklike takies some time or Time And Frequency fragment when Channel Transmission;
Steps A 2. is confirmed the required basic channel unit of Added Business according to business demand and it is preengage;
A21 accomplishes the division to LDPC frame or the grouping of master data frame according to the dividing mode of sub-interlacing frames or interlacing frames;
A22 according to the transmission rate of Added Business, confirms required basic channel unit, and the grouping in LDPC frame or the master data frame is preengage;
Steps A 3. is merged into basic channel unit newly-increased physical-layer sub-channel and is distributed to Added Business; Therefore; Said newly-increased physical-layer sub-channel is a subchannel of in existing GB system physical layer channel, opening up; It is made up of basic channel unit, in transmission, takies different time or Time And Frequency resource regularly, can be received end and on physical layer frame structure, distinguish;
4. pairs of basic business data of steps A meet the coding and the modulation of gb specification; Obtain basic service LDPC frame or by its master data frame of forming; The Added Business data are carried out the enhance encoding and the modulation of compatible GB; Obtain Added Business LDPC frame or by its master data frame of forming, wherein, a master data frame is made up of several (depending on the planisphere mapping mode) LDPC coded identification pieces; Each LDPC coded identification piece is called a LDPC frame, and its length is determined by the planisphere mapping mode;
Steps A 5. is filled in the LDPC frame or the grouping of master data frame of not reservation with basic service LDPC frame or by the master data frame that it is formed; Be filled in the LDPC frame or the grouping of master data frame of reservation in the steps A 2 with the Added Business LDPC frame that obtains in the steps A 4 or by the master data frame that it is formed according to the basic channel unit type; Realize the multiple connection of Added Business and existing basic service; The master data frame complex data that obtains after the multiple connection is carried out subsequent treatment obtain radiofrequency signal, and this radiofrequency signal is transmitted on physical layer channel.
If steps A 6. business demands change, then return steps A 1 and design, otherwise, keep existing configuration constant.
The basic channel unit division methods of a kind of GB system physical layer channel of said steps A 1, for the situation of transmitting terminal symbol interleaving parameter M=720,
All interlacing frames are divided into 10 groups, and as 1 first kind basic channel unit, promptly the number of first kind basic channel unit is 10 with one group of interlacing frames in selection, and first kind basic channel unit is used for transmitting interlacing frames and divides the data of dividing into groups in the back.
Perhaps all sub-interlacing frames are divided into 5L group (the constellation mapping pattern decision of being adopted when wherein L is modulated by transmitting terminal, 2 LBe counting of planisphere), as 1 second type of basic channel unit, promptly the number of second type of basic channel unit is 5L with one group of sub-interlacing frames in selection, second type of basic channel unit is used for transmitting sub-interlacing frames and divides the data of dividing into groups in the back.
Situation for transmitting terminal symbol interleaving parameter M=240; All sub-interlacing frames are divided into 10 groups; Selection with one group of sub-interlacing frames as 1 the 3rd type of basic channel unit; Promptly the number of the 3rd type of basic channel unit is 10, and the 3rd type of basic channel unit is used for transmitting sub-interlacing frames and divides the data of dividing into groups in the back.
In the said steps A 3; Between receiving terminal and the transmitting terminal all newly-increased physical-layer sub-channel parameters (comprising the basic channel unit label that basic channel unit type, newly-increased physical-layer sub-channel comprise, newly-increased physical-layer sub-channel original position etc.) are arranged, so that follow-up receiving terminal is separated timing and obtained newly-increased physics straton information and demodulation Added Business;
Perhaps; A newly-increased physical-layer sub-channel is set to signaling channel; Only signaling channel parameter (comprising signaling data distribution, signaling data form etc.) is arranged between receiving terminal and the transmitting terminal; Signaling comprises the parameter of all newly-increased physical-layer sub-channels, and receiving terminal is through obtaining newly-increased physical-layer sub-channel parameter and demodulation Added Business to the demodulation of signaling channel.This mode can be as required dynamically disposes and adjusts the parameter of other newly-increased physical-layer sub-channels neatly in transmission.
Carry out the enhance encoding and the modulation of compatible GB like 4 pairs of Added Business data of steps A, can select outer Error Correction of Coding module, repeated encoding module and planisphere expansion mapping based on service needed, concrete steps are following:
A4.1 carries out outer error correction coding to the Added Business incoming bit stream and seals dress with the TS that meets existing state mark system pattern of the input, obtains Added Business equivalence TS input packet, wherein, also can select not carry out outer error correction coding according to service needed;
A4.2; The randomization and the forward error correction coding that the Added Business equivalence TS input packet of steps A 4.1 are met gb specification; Wherein, Forward error correction coding specifically adopts Bose-Chaudhuri-Hocquenghem Code and LDPC coding, obtains Added Business LDPC code word, and its coded system should be identical with the coded system that existing basic service adopts;
A4.3 carries out repeated encoding to the Added Business LDPC code word that steps A 4.2 obtains, and to obtaining two or more sets output LDPC code words identical with it behind every group of input LDPC codeword coding, wherein, also can select not carry out repeated encoding according to service needed;
A4.4 carries out planisphere mapping or planisphere expansion mapping to the Added Business LDPC code word behind the repeated encoding that obtains of coding A4.3, obtains Added Business LDPC frame or by its master data frame of forming.
The emission system of the above-mentioned physical-layer sub-channel allocation method of use provided by the invention; As shown in Figure 8; This emission system comprises: physical layer channel is divided module, sub-interlacing frames or interlacing frames and is divided module, LDPC frame or master data frame division module, scheduler module, signaling and professional multiple connection module, basic service code modulation module, Added Business code modulation module, multiple connection module, subsequent treatment module; Be used for basic business data, Added Business data and signaling data converted to and transmit, wherein basic business data takies different physical-layer sub-channels respectively with Added Business data (can comprise signaling data).Wherein:
Physical layer channel is divided module, be used for physical layer channel is divided into several basic channel units on time or Time And Frequency, basic channel unit time that correspondence is divided or/and Time And Frequency fragment transmitting data;
Sub-interlacing frames or interlacing frames are divided module, are used to adopt the dividing mode corresponding with the division of physical layer channel that all sub-interlacing frames of transmitting terminal or interlacing frames are divided, being grouped in after dividing take said basic channel unit when transmitting;
LDPC frame or master data frame are divided module, are used for accomplishing the division to LDPC frame or the grouping of master data frame according to the dividing mode of sub-interlacing frames or interlacing frames;
Scheduler module; Preengage according to business demand definite transmission required basic channel unit of Added Business and to it; The basic channel unit of reservation is merged into newly-increased physical-layer sub-channel and distributed to Added Business; Schedule information (like the timing control signal of whole emission system) when producing basic service and Added Business multiple connection; This scheduler module comprises LDPC frame or master data frame reservation module, is used for the transmission rate according to Added Business, and the grouping in LDPC frame or the master data frame is preengage;
The basic service code modulation module is used for basic business data is carried out gb specification coding and modulation, obtains basic service LDPC frame or by its master data frame of forming; The concrete implement device of basic service code modulation module is shown in Fig. 9 a; Wherein the input interface module of basic service code modulation module specific coding and modulated process, randomization module, forward error correction coding module, planisphere mapping block and gb specification are identical, but whole module scheduled information Control and increased cache module.
The Added Business code modulation module is used for the Added Business data are carried out the enhance encoding similar with gb specification modulation, obtains Added Business LDPC frame or by its master data frame of forming; Wherein the concrete implement device of Added Business code modulation module is shown in Fig. 9 b, is to have increased outer error correction coding module with basic service code modulation module different, and TS seals dress module and repeated encoding module.Outer error correction coding module is carried out outer error correction coding to the Added Business data, obtains the Added Business data of outer sign indicating number protection; TS seals the dress module, and under the control of scheduler module, the Added Business data adding TS packet header to signaling data and outer sign indicating number protection is encapsulated as input TS bag; Input interface module under the control of scheduler module, is accomplished the rate adapted to the Added Business data; The randomization module under the control of scheduler module, is accomplished the scrambler to input TS bag; The forward error correction coding module is used for the Added Business data are carried out forward error correction coding; The repeated encoding module is used for Added Business is carried out repeated encoding; The planisphere mapping block is used for the output bit of error correction coding or repeated encoding is mapped as baseband signal frame or LDPC frame.
Signaling and professional multiple connection module are carried out multiple connection with signaling and one road Added Business and are obtained one tunnel compound Added Business;
The multiple connection module; Be used for being filled into basic service LDPC frame or by the master data frame that it is formed the LDPC frame or the grouping of master data frame of not reservation according to schedule information; Be filled in the LDPC frame or the grouping of master data frame of reservation with Added Business LDPC frame or by the master data frame that it is formed, accomplish the multiple connection of Added Business and basic service;
The subsequent treatment module is carried out subsequent treatment with the master data frame complex data that obtains after the multiple connection and is obtained radiofrequency signal, and this radiofrequency signal is transmitted on physical layer channel; Complete symbol gb specification, concrete implement device is accomplished and is finally converted master data frame complex data into transmit sequence of operations shown in Fig. 9 c.
This emission system can also comprise parameter agreement module, is used for receiving terminal all newly-increased physical-layer sub-channel parameters being arranged; Or comprise signaling parameter agreement module and signaling and professional multiple connection module, and wherein, signaling and professional multiple connection module are used for that signaling and one road Added Business are carried out multiple connection and obtain one tunnel compound Added Business, and signaling comprises all newly-increased physical-layer sub-channel parameters; Signaling parameter agreement module, be used for and receiving terminal between the shared signaling channel parameter of signaling transmission is arranged.
The subsequent treatment module comprises interleaving block, is used for corresponding sub-interlacing frames or the interlacing frames of forming behind LDPC frame or the master data frame process interframe symbol convolutional interleave.
In addition, the receiving system of provided by the invention and above-mentioned emission system, the receiving system of basic service and existing receiver are in full accord.For Added Business, the present invention further proposes the receiving system (also claiming Added Business receiver reference implementation device) of corresponding above-mentioned emission system.Shown in figure 10, this receiving system is operated in the receiving terminal of corresponding said emission system, comprising: parameter agreement module is used for transmitting terminal all newly-increased physical-layer sub-channel parameters being arranged; Or comprise signaling parameter agreement module, be used for and transmitting terminal between the shared signaling channel parameter of signaling transmission is arranged; The signal demodulation module, under the control of control module, signaling channel parameter is according to a preconcerted arrangement carried out demodulation to signaling channel, to obtain all newly-increased physical-layer sub-channel parameters.Therefore under the situation that all newly-increased physical-layer sub-channel parameters have been arranged, do not need the signal demodulation module. Synchronously, channel estimating and channel equalization module, be used under the control of control module, accomplish to received signal synchronously, channel estimating and channel equalization, obtain through data symbol, channel condition information and synchronizing information after balanced; Control module is used for based on synchronizing information and the timing control signal that obtains the whole receiving system of physical-layer sub-channel parameter generating; Professional demodulation module under the control of control module, carries out demodulation to the physical-layer sub-channel that comprises required Added Business.
With reference to Figure 11; The signal demodulation module or the professional demodulation module of receiving system further comprise following submodule: separate multiple connection module, de-interleaving block, separate mapping block, forward error correction coding and repeated encoding decoder module, descrambling module, output interface module, TS bag payload extraction module and outer error correction coding decoder module; Respectively with above-mentioned emission system in multiple connection module, interleaving block, planisphere mapping block, forward error correction coding module, randomization module, input interface module,, TS seal the dress module and outer error correction coding module corresponding one by one, repeat no more.
The technical scheme that the embodiment of the invention provides utilizes the standard of state's mark system to propose physical-layer sub-channel allocation method; Carry out system design according to the Added Business demand; Obtain emission system according to system design step, and obtain the receiving system of Added Business according to system design; Its beneficial effect is under the compatible fully situation of assurance and existing state mark system, the Added Business with enhance encoding modulation is provided outside basic service, and has reduced receiver cost, power consumption and implementation complexity.In addition, physical-layer sub-channel allocation method provided by the invention can be used for similar terrestrial broadcast system applied environment.
Provide concrete embodiment below, embodiment 1 will provide the embodiment of the present invention in state's mark system.And embodiment 2,3 will be respectively provides specific execution mode to state's mark system of two kinds of different transmitting terminal parameters.
Embodiment 1
Steps A 1. is divided into basic channel unit according to initiator parameters with existing channel
According to the difference of transmitting terminal system parameters, the difference of symbol interleaving parameter M particularly, basic channel unit can be taken as one group of interlacing frames or one group of sub-interlacing frames.Specifically:
For the situation of transmitting terminal symbol interleaving parameter M=720, one group of interlacing frames or one group of sub-interlacing frames can be as basic channel units.
If when selecting with one group of interlacing frames, at first interlacing frames is divided into 10 groups, is designated as I as a basic channel unit 0 1, I 1 1I 9 1, wherein I i 1 = { F t Inter | t ≡ i Mod ( 10 ) } , Then every group all is 1 first kind basic channel unit that the present invention defines, and whole physical layer channel can be divided into 10 first kind basic channel units altogether.As shown in Figure 3, when in physical layer channel, transmitting, each first kind basic channel unit is in time with 10T FFor taking length at interval is T FTimeslice.
If when selecting with one group of sub-interlacing frames, at first sub-interlacing frames is divided into 5L group (the wherein constellation mapping pattern decision adopted by the transmitting terminal modulation system of L, 2 as a basic channel unit LBe counting of planisphere), be designated as I 0 2, I 1 2I 5L-1 2, I i 2 = { F t Sub | t ≡ i Mod ( 5 L ) } , Then wherein every group all be second type of basic channel unit that the present invention defines.As shown in Figure 4, when in channel, transmitting, each second type of basic channel unit is in time with 10T FFor taking length at interval is T F1 chronon sheet (single carrier mode) or 1 sub-sheet of frequency (multi-carrier mode) of timeslice.Wherein during L=2, second type of basic channel unit degenerates into first kind basic channel unit.
For the situation of transmitting terminal symbol interleaving parameter M=240, can only select with one group of sub-interlacing frames as a basic channel unit.At first sub-interlacing frames is divided into 10 groups, is designated as I 0 3, I 1 3I 9 3, I i 3 = { F t Sub | t ≡ i Mod ( 10 ) } , Then wherein every group all be the 3rd type of basic channel unit that the present invention defines.When in channel, transmitting, it is T that each the 3rd type of basic channel unit takies length according to the mode of Fig. 5 FTimeslice in 1 chronon sheet (single carrier mode) or 1 sub-sheet of frequency (multi-carrier mode).
Steps A 2. is confirmed the required basic channel unit of Added Business according to business demand and it is preengage
According to the demands such as transmission rate of Added Business, confirm required some basic channel units, and these unit are preengage at master data frame or LDPC frame place.The concrete grammar of reservation is:
A2.1 at first accomplishes the division to master data frame (or LDPC frame) according to the dividing mode to interlacing frames (or sub-interlacing frames);
To the situation of M=720, if interlacing frames is divided into 10 groups, I i 1 = { F t Inter | t ≡ i Mod ( 10 ) } , Then correspondingly also divide the master data frame into 10 groups, B i 1 = { F t Basic | t ≡ i Mod ( 10 ) } : If divide sub-interlacing frames into the 5L group, I i 2 = { F t Sub | t ≡ i Mod ( 5 L ) } , Then correspondingly the LDPC frame also is divided into the 5L group, B i 2 = { F t LDPC | t ≡ i Mod ( 5 L ) } . To the situation of M=240, sub-interlacing frames is divided into 10 groups, I i 3 = { F t Sub | t ≡ i Mod ( 10 ) } , Then correspondingly the LDPC frame is divided into 10 groups, B i 3 = { F t LDPC | t ≡ i Mod ( 10 ) } .
A2.2 according to the transmission rate of Added Business, confirms required some basic channel units, and the grouping in the master data frame (or LDPC frame) is preengage;
Analysis shows, B i kIn symbol and I i kIn symbol constitute mapping relations one by one, therefore if I i kBe selected for the Added Business transmission, then need be to B i kPreengage, promptly whole physical channel is carried out scheduling of resource, make existing basic business data not take B at master data frame place i kThereby, make I i kFree out and supply the Added Business data to use.
Steps A 3. is merged into basic channel unit newly-increased physical-layer sub-channel and is distributed to Added Business
Some basic channel units of reservation in the steps A 2 are merged into the transmission that one (or a plurality of) newly-increased physical-layer sub-channel is used for Added Business, and confirm the original position of newly-increased physical-layer sub-channel at multistage multi-frame structure according to frame structure.
If all newly-increased physical-layer sub-channel parameters (comprising the basic channel unit label that basic channel unit type, newly-increased physical-layer sub-channel comprise, newly-increased physical-layer sub-channel original position etc.) are arranged in advance, then can parameter according to a preconcerted arrangement accomplish demodulation to newly-increased physical-layer sub-channel at receiving terminal.
For a plurality of newly-increased physical-layer sub-channels are carried out flexible configuration, the present invention further proposes to distribute a newly-increased physical-layer sub-channel to be used for the transmission of signaling as signaling channel, and signaling comprises the parameter of all newly-increased physical-layer sub-channels.Through the support of signaling channel, system can be as required dynamically disposes and adjusts the parameter of other physical-layer sub-channels neatly in transmission, and need not in advance it to be arranged.Signaling channel can be used for carrying some Added Business data in command transmitting.In order to guarantee the right demodulation of receiving terminal to signaling channel, transmission system still must be arranged the configuration parameter of signaling channel, signaling data distribution, signaling data form etc. in advance.
4. pairs of basic services of steps A are carried out the coding and the modulation of symbol gb specification, the Added Business data are carried out the enhance encoding and the modulation of compatible GB
In order to keep the compatibility of Added Business to existing state mark system; Its input TS packet format, randomization, BCH (Bose-Chaudhuri-Hocquenghem) coding, LDPC (low density parity check code) coding, constellation mapping mode and interleaving mode etc. must be consistent with existing state mark system fully, and therefore following A4.2 and A4.4 are essential steps.Simultaneously, can have more large coverage or lower demodulation signal-noise ratio threshold, can adopt outer error correction coding and TS among A4.1, A4.3 and the A4.4 to seal dress in order to make Added Business, repeated encoding, planisphere expansion mapping waits and strengthens option.Whole Added Business enhance encoding and modulation step are as shown in Figure 6.
A4.1 carries out outer error correction coding to the Added Business incoming bit stream and seals dress with the TS that meets existing state mark system pattern of the input; Obtain Added Business equivalence TS input packet; Wherein outer error correction coding can adopt the RS coding, wherein, also can select not carry out outer error correction coding according to service needed;
A4.2 imports randomization, Bose-Chaudhuri-Hocquenghem Code, the LDPC coding that packet meets gb specification to the Added Business equivalence TS of A4.1, obtains Added Business LDPC code word, and its coded system should be identical with the coded system that existing basic service adopts.
A4.3 carries out repeated encoding to the Added Business LDPC code word that A4.2 obtains, and to obtaining two or more sets output LDPC code words identical with it behind every group of input LDPC codeword coding, wherein, also can select not carry out repeated encoding according to service needed;
The Added Business LDPC code word of A4.4 after to the repeated encoding that obtains of coding A4.3 carried out planisphere mapping or planisphere expansion mapping, obtains Added Business LDPC symbolic blocks, i.e. the LDPC frame of Added Business.Counting of planisphere mapping or planisphere expansion mapping must be counted identical with the planisphere mapping that existing basic service is used.Planisphere expansion mapping promptly adopts the planisphere after the expansion to shine upon.
With reference to Fig. 7, the method for the planisphere expansion that the present invention proposes is that the invariant position of maintenance planisphere inner constellation point is expanded to the outside on border, place the constellation point on planisphere border (not containing the summit) according to factor a; To each summit, expand according to factor a to the outside on two borders that belong to simultaneously.Spreading factor a is following with the relation that mapping back symbol average power promotes multiple K:
16QAM： α = 10 K - 1 / 3 - 1 , K ≥ 1
64QAM： α = 84 K - 35 / 7 - 1 , K ≥ 1 .
Steps A 5 is filled in the LDPC frame or the grouping of master data frame of reservation in the steps A 2 with the Added Business LDPC frame that obtains in the steps A 4 or by the master data frame that it is formed according to the basic channel unit type; Be filled in the LDPC frame or the grouping of master data frame of not reservation with the basic service LDPC frame that obtains in the steps A 4 or by the master data frame that it is formed, realize the multiple connection of Added Business and existing basic service.
If steps A 6. business demands change, then return steps A 1 and design, otherwise, keep existing configuration constant.
Embodiment 2
To provide a kind of embodiment of the present invention.
This execution mode to state's mark system initiator parameters is: the planisphere mapping mode is 64QAM, interleave parameter M=240, and frame head adopts the PN420 pattern, and the LDPC code check is 0.6.Need in this system, add at present and transmit one road Added Business, therefore need distribute a newly-increased physical-layer sub-channel for it.
Concrete steps are following:
Step B1. will have physical layer channel now and be divided into basic channel unit
Described in steps A 1., basic channel unit is taken as one group of sub-interlacing frames, is 10 the 3rd type of basic channel units with channel distribution then, I 0 3, I 1 3I 9 3
Step B2. confirms required Channel Elements and preengages
The signal frame frame head of this system adopts the PN420 pattern, and then each superframe comprises 225 signal frames, corresponding to 225 interlacing frames.Each interlacing frames comprises 3 sub-interlacing frames when adopting the mapping of 64QAM planisphere, so corresponding 225 * 3=675 the sub-interlacing frames of each superframe.Existing with I 0 3And I 5 3Two the 3rd type of basic channel units are merged into a physical-layer sub-channel, and then the gained physical-layer sub-channel is spaced apart 5 on sub-interlacing frames, in each superframe, all takies 135 in 675 sub-interlacing frames just.And this physical-layer sub-channel is set in each superframe, all originates in first sub-interlacing frames, be convenient to the location of receiving terminal this physical-layer sub-channel.Selected I 0 3And I 5 3Be used for the Added Business transmission, then said with reference to A2, the LDPC frame is divided into 10 groups, B i 3 = { F t LDPC | t i Mod ( 10 ) } , I 0,1 ... 9, and to B 0 3And B 5 3Group LDPC frame is preengage.
Step B3. is with reference to Figure 12, with I 0 3And I 5 3Merge as newly-increased physical-layer sub-channel and distribute to the Added Business use, suppose that the configuration parameter of this subchannel is arranged in advance, no longer add signaling;
Step B4. meets the coding and the modulation of gb specification to basic business data, the Added Business data is carried out the enhance encoding and the modulation of compatible GB.
Step B4.1 carries out outer error correction coding to the Added Business incoming bit stream and seals dress with the TS that meets the GB pattern of the input and obtain Added Business equivalence TS input packet;
The Added Business equivalence TS input packet that step B4.2 obtains B4.1 carries out Bose-Chaudhuri-Hocquenghem Code, the LDPC coding of gb specification, obtains Added Business LDPC code word;
Step B4.3 carries out repeated encoding to the Added Business LDPC code word that step B4.2 obtains, and obtains two or more sets identical LDPC code words after repeating once to every group of input LDPC code word to export.
Added Business LDPC code word behind the repeated encoding that step B4.4 obtains B4.3 is carried out 64QAM planisphere expansion mapping, obtains Added Business LDPC symbolic blocks, i.e. Added Business LDPC frame.
With reference to Figure 13, the method for 64QAM planisphere expansion mapping is for outwards to expand outermost 28 constellation point of 64QAM planisphere, and 36 inner constellation point remain unchanged; Get spreading factor a=0.648, then the symbols streams average power after the mapping promotes 3dB.Planisphere according to after the expansion shines upon the LDPC code word.
The Added Business LDPC frame that step B5 obtains step B4 is filled into the B of reservation 0 3And B 5 3In the grouping, the basic service LDPC frame that step B4 is obtained is filled into except that B 0 3And B 5 3In the grouping in addition, realize the multiple connection of Added Business and basic service.
Embodiment 3
To provide another kind of embodiment of the present invention.
This execution mode to state's mark system initiator parameters is: the planisphere mapping mode is 16QAM, interleave parameter M=720, and frame head adopts the PN945 pattern, and the LDPC code check is 0.8.Need in this system, add at present and transmit the two-way Added Business, therefore need distribute two newly-increased physical-layer sub-channels for it.
Concrete steps are following:
Step C1. is divided into basic channel unit with existing channel
Described in steps A 1., basic channel unit is taken as one group of interlacing frames, then obtains 10 first kind basic channel units altogether, I 0 1, I 1 1I 9 1
Step C2. confirms required Channel Elements and preengages
Because the signal frame frame head of present embodiment system adopts the PN945 pattern, then each superframe comprises 200 signal frames, corresponding to 200 interlacing frames.Every group of first kind basic channel unit all equally spaced takies 20 in 200 interlacing frames in each superframe under this pattern.Selected at present I 0 1, I 1 1With I 2 1Three first kind basic channel units supply transmission Added Business and signaling to use.Then said with reference to A2, also divide the master data frame into 10 groups, B i 1 = { F t Basic | t ≡ i Mod ( 10 ) } , I=0,1 ... 9, and to B 0 1, B 1 1And B 2 1Group master data frame is preengage.
Step C3. distributes and adds signaling to subchannel
I 0 1Be set to newly-increased physical-layer sub-channel 1, or signaling channel, be used for command transmitting and Added Business 1.The configuration parameter of signaling channel need be arranged at transmitting terminal and receiving terminal in advance.The original position of signaling is set to first master data frame of each superframe, in the signaling channel behind the command transmitting remaining capacity be used to transmit Added Business 1.I 1 1With I 2 1Be defined as newly-increased physical-layer sub-channel 2 after the merging, be used to transmit Added Business 2.In demodulating process, receiving terminal demodulation and resolve signaling from signaling channel at first by appointment obtains the number of newly-increased physical-layer sub-channel and the configuration parameter of each subchannel.Subsequently, required physical-layer sub-channel is carried out demodulation, obtain required business datum according to the parameter that obtains.
With reference to Figure 14, with I 0 1Distribute to signaling and Added Business 1 uses as newly-increased physical-layer sub-channel 1, with I 1 1With I 2 1Merge into newly-increased physical-layer sub-channel 2 and distribute to Added Business 2 and use.
Step C4. meets the coding and the modulation of gb specification to basic business data, the Added Business data is carried out the coding and the modulation of compatible GB.
Step C4.1 carries out outer error correction coding and TS respectively to two-way Added Business data bit flow and seals dress and obtain equivalent TS input packet 1 and equivalent TS input packet 2.
The two-way Added Business equivalence TS input packet that step C4.2 obtains C4.1 carries out Bose-Chaudhuri-Hocquenghem Code, the LDPC coding of gb specification respectively, obtains Added Business LDPC code word 1 and Added Business LDPC code word 2.
Step C4.3 carries out repeated encoding to the Added Business LDPC code word 2 that C4.2 obtains, and promptly every group of input LDPC code word is repeated once, obtains two or more sets identical LDPC code words and exports; 1 of Added Business LDPC code word is not carried out repeated encoding, promptly to the output of keeping intact of every group of input LDPC code word.
LDPC code word 1 behind the repeated encoding that step C4.4 obtains C4.3 is carried out 16QAM planisphere expansion mapping, obtains Added Business symbolic blocks 1, i.e. Added Business master data frame 1; LDPC code word 2 is carried out common 16QAM planisphere mapping, obtain Added Business symbolic blocks 2, i.e. Added Business master data frame 2.
With reference to Figure 15, the method for 16QAM planisphere expansion mapping is for to expand outwardly outermost 12 constellation point of 16QAM planisphere, and 4 inner constellation point remain unchanged.Get spreading factor a=0.453, the average power of the symbolic blocks that obtains after the feasible mapping promotes 3dB.Shine upon according to the LDPC code word 1 of the planisphere after the expansion after repeated encoding.Still adopt common 16QAM planisphere to shine upon to LDPC code word 2.
The Added Business master data frame 1 that step C5 obtains step C4 is filled into the B of reservation 0 1In the grouping, be that unit is filled into the B in the master data frame of reservation also with the master data frame with Added Business master data frame 2 1 1, B 2 1In the grouping, the basic service master data frame that step C4 is obtained is filled into except that B 0 1, B 1 1And B 2 1In the grouping in addition, realize the multiple connection of Added Business and basic service.
In conjunction with embodiment 2, embodiment 3, the multi-service transmission based on physical-layer sub-channel that the present invention is proposed carries out concise and to the point performance evaluation.
At transmitting terminal; Because Added Business has adopted expanding constellation figure mapping in modulated process, the symbol average power of therefore carrying the Added Business data will improve, and will be constant in order to guarantee total transmitting power; Correspondingly, carry the average power meeting decrease to some degree of the symbol of basic business data.Result of calculation shows; For embodiment two; Constant in order to guarantee total transmitting power, Added Business data symbol average power improves 3dB, because the Added Business data symbol takies 1/5 physical layer channel resource; Then the average power of basic business data symbol need reduce 1.25dB, i.e. the signal to noise ratio decline 1.25dB of basic service under equal transmission conditions; For embodiment three, signaling and Added Business 1 data symbol average power improve 3dB, because Added Business 1 data symbol takies 1/10 physical layer channel resource, the basic service signal to noise ratio of bringing thus drops to 0.51dB.This shows, according to the proposed method, in the transmission performance that improves Added Business, very little to the performance impact of basic service.
At receiving terminal, after accomplishing synchronously, the Added Business receiving system can only be operated on the timeslice (multi-carrier mode) or chronon sheet (single carrier mode) of carrying required business datum.For embodiment two, system only needs after accomplishing synchronously in 1/5 time in running order (single carrier mode); For embodiment three, system only needs time (to receiving Added Business 1) or 3/10 the time (to reception Added Business 2) 1/10 in running order after accomplishing synchronously.More than analyze and show that the method that the present invention proposes helps to reduce the power consumption of receiving terminal, be particularly useful for the business transmission to hand-held receiving equipment such as mobile TV broadcasting.
Above execution mode only is used to explain the present invention; And be not limitation of the present invention; The those of ordinary skill in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also be made various variations and modification; Therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.

Claims (8)

1. one kind is used for the physical-layer sub-channel allocation method that terrestrial broadcasting is transmitted; Be applicable to the digital tv ground broadcasting of standard in " GB20600-2006 digital television ground broadcast transmission system frame structure, chnnel coding and modulation " national standard; It is characterized in that; When transmitting terminal has Added Business to transmit, may further comprise the steps:
S1 is divided into several basic channel units with physical layer channel on time or Time And Frequency, basic channel unit is at corresponding time of being divided or Time And Frequency fragment transmitting data;
S2 preengages based on business demand definite transmission required basic channel unit of Added Business and to it;
S3 merges into the basic channel unit of reservation newly-increased physical-layer sub-channel and distributes to Added Business;
S4 after basic service and Added Business encoded respectively and modulate, transmits Added Business in newly-increased physical-layer sub-channel, basic service is transmitted in all the other physical layer channel;
Among the step S1, the division of corresponding all sub-interlacing frames of transmitting terminal of the division of said physical layer channel or interlacing frames, said basic channel unit is used for transmitting sub-interlacing frames or interlacing frames is divided the data of dividing into groups in the back;
Step S2 comprises substep:
S21 accomplishes the division to LDPC frame or the grouping of master data frame according to the dividing mode of sub-interlacing frames or interlacing frames;
S22 according to the transmission rate of Added Business, confirms required basic channel unit, and the grouping in LDPC frame or the master data frame is preengage;
Step S4 comprises substep:
S41 encodes and modulates basic business data, obtains basic service LDPC frame or by its master data frame of forming;
S42 encodes and modulates the Added Business data, obtains Added Business LDPC frame or by its master data frame of forming;
S43 is filled in the LDPC frame or the grouping of master data frame of not reservation with basic service LDPC frame or by the master data frame that it is formed;
S44 is filled in the LDPC frame or the grouping of master data frame of reservation with Added Business LDPC frame or by the master data frame that it is formed, and accomplishes the multiple connection of Added Business and basic service;
S45 carries out subsequent treatment with the master data frame complex data that obtains after the multiple connection and obtains radiofrequency signal, and this radiofrequency signal is transmitted on physical layer channel;
Among the step S42 Added Business data are encoded and modulation comprises following substep:
S421 ' carries out outer error correction coding with the Added Business incoming bit stream and seals dress with the TS that meets pattern of the input, obtains Added Business equivalence TS input packet;
S422 ' carries out randomization, Bose-Chaudhuri-Hocquenghem Code, LDPC coding successively to Added Business equivalence TS input packet, obtains Added Business LDPC code word;
S423 ' carries out repeated encoding to Added Business LDPC code word;
S424 ' carries out planisphere mapping or planisphere expansion mapping with the output behind the repeated encoding, obtains the LDPC frame or by its master data frame of forming.
2. the method for claim 1 is characterized in that,
If during the symbol interleaving parameter M=720 of transmitting terminal:
In step S1, the number of basic channel unit is 10, and the interlacing frames of transmitting terminal is divided into 10 groups, and basic channel unit is used for transmitting interlacing frames and divides the data of dividing into groups in the back;
Or in step S1; The number of basic channel unit is 5L, and the sub-interlacing frames of all of transmitting terminal is divided into the 5L group, and basic channel unit is used for transmitting sub-interlacing frames and divides the data of dividing into groups in the back; The constellation mapping pattern decision of being adopted when wherein L is modulated by transmitting terminal, 2L is counting of planisphere.
3. the method for claim 1 is characterized in that,
If during transmitting terminal symbol interleaving parameter M=240,
Among the step S1, the number of basic channel unit is 10, and all sub-interlacing frames of transmitting terminal are divided into 10 groups, and basic channel unit is used for transmitting sub-interlacing frames and divides the data of dividing into groups in the back.
4. the method for claim 1 is characterized in that,
Between receiving terminal and the transmitting terminal all newly-increased physical-layer sub-channel parameters are arranged in this method;
Perhaps, a newly-increased physical-layer sub-channel is set to be used for the signaling channel of command transmitting, and said signaling comprises all newly-increased physical-layer sub-channel parameters, only the signaling channel parameter is arranged between receiving terminal and the transmitting terminal.
5. the method for claim 1 is characterized in that, the method for planisphere expansion mapping is among the step S424 ': keep the invariant position of planisphere inner constellation point,
The constellation point on planisphere border that will be except that the summit is expanded according to setting factor a to the outside on border, place;
To each summit, expand according to setting factor a to the outside on two borders at its place simultaneously, wherein a＞0.
6. an emission system of using the said physical-layer sub-channel allocation method of claim 1 is characterized in that, this emission system comprises:
Physical layer channel is divided module, is used for physical layer channel is divided into several basic channel units on time or Time And Frequency, and basic channel unit is at time or Time And Frequency fragment transmitting data that correspondence is divided;
Scheduler module; Confirm the transmission required basic channel unit of Added Business and it is preengage based on transmitter parameter and system business demand; The basic channel unit of reservation is merged into newly-increased physical-layer sub-channel and distributed to Added Business, the schedule information when producing basic service coding and modulation, Added Business coding with modulation and basic service and Added Business multiple connection;
Transport module after being used for basic service and Added Business encoded respectively and modulate, transmits Added Business according to said schedule information in newly-increased physical-layer sub-channel, basic service is transmitted in all the other physical layer channel;
This emission system also comprises:
Sub-interlacing frames or interlacing frames are divided module, are used to adopt the dividing mode corresponding with the division of physical layer channel that all sub-interlacing frames of transmitting terminal or interlacing frames are divided, take said basic channel unit during transmitted in packets after dividing;
LDPC frame or master data frame are divided module, are used for accomplishing the division to LDPC frame or the grouping of master data frame according to the dividing mode of sub-interlacing frames or interlacing frames;
Said scheduler module also comprises LDPC frame or master data frame reservation module, is used for the transmission rate according to Added Business, preengages required basic channel unit, and the grouping in LDPC frame or the master data frame is preengage;
Said transport module further comprises:
The basic service code modulation module is used for basic business data is encoded and modulated, and obtains basic service LDPC frame or by its master data frame of forming;
The Added Business code modulation module is used for the Added Business data are encoded and modulated, and obtains Added Business LDPC frame or by its master data frame of forming;
The multiple connection module; Be used for being filled into basic service LDPC frame or by the master data frame that it is formed the LDPC frame or the grouping of master data frame of not reservation according to schedule information; Be filled in the LDPC frame or the grouping of master data frame of reservation with Added Business LDPC frame or by the master data frame that it is formed, accomplish the multiple connection of Added Business and basic service;
The subsequent treatment module is carried out subsequent treatment with the master data frame complex data that obtains after the multiple connection and is obtained radiofrequency signal, and this radiofrequency signal is transmitted on physical layer channel;
Said Added Business code modulation module comprises:
Outer error correction coding module is used for the Added Business incoming bit stream is carried out outer error correction coding;
TS seals the dress module, and the TS that is used for after error correction coding the Added Business incoming bit stream is met pattern of the input seals dress, obtains Added Business equivalence TS input packet;
Input interface module is accomplished the rate adapted to Added Business equivalence TS input packet;
The randomization module is used for Added Business equivalence TS input packet is carried out scrambler;
The forward error correction coding module is used for Added Business equivalence TS input packet is carried out Bose-Chaudhuri-Hocquenghem Code and LDPC coding, obtains Added Business LDPC code word;
The repeated encoding module is used for Added Business LDPC code word is carried out repeated encoding;
The planisphere mapping block is used for planisphere mapping or planisphere expansion mapping are carried out in the output behind the repeated encoding, obtains the LDPC frame or by its master data frame of forming;
Cache module; Be used for buffer memory basic service code modulation module obtains under the control of schedule information basic service LDPC frame or by its master data frame of forming, and the Added Business code modulation module obtains Added Business LDPC frame or by its master data frame of forming;
Said subsequent treatment module comprises interleaving block, is used for forming corresponding sub-interlacing frames or interlacing frames behind LDPC frame or the master data frame process interframe symbol convolutional interleave.
7. emission system as claimed in claim 6 is characterized in that, this emission system comprises parameter agreement module, is used for receiving terminal all newly-increased physical-layer sub-channel parameters being arranged;
Or comprise signaling parameter agreement module, signaling and professional multiple connection module, wherein
Signaling and professional multiple connection module are used for that signaling and one road Added Business are carried out multiple connection and obtain one tunnel compound Added Business, and signaling comprises all newly-increased physical-layer sub-channel parameters;
Signaling parameter agreement module, be used for and receiving terminal between the shared channel parameter of signaling transmission is arranged.
8. the receiving system corresponding to the said emission system of claim 6 is characterized in that, this receiving system comprises:
Parameter agreement module is used for transmitting terminal all newly-increased physical-layer sub-channel parameters being arranged; Or comprise signaling parameter agreement module and signal demodulation module, wherein, signaling parameter agreement module, be used for and transmitting terminal between signaling transmitted shared signaling channel parameter arrange; The signal demodulation module, under the control of control module, signaling channel parameter is according to a preconcerted arrangement carried out demodulation to signaling channel, to obtain all newly-increased physical-layer sub-channel parameters;
Synchronously, channel estimating and channel equalization module, be used to accomplish to received signal synchronously, channel estimating and channel equalization, obtain through data symbol, channel condition information and synchronizing information after balanced;
Control module is used for the timing control signal according to said synchronizing information and the whole receiving system of said physical-layer sub-channel parameter generating;
Professional demodulation module under the control of control module, carries out demodulation to the physical-layer sub-channel that comprises required Added Business.
CN2009100852299A 2009-06-04 2009-06-04 Physical-layer sub-channel allocation method, emission system and receiving system Expired - Fee Related CN101562502B (en)

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