CN101401318B - An inserting method and device for inserting control information, and a measuring method and device - Google Patents
An inserting method and device for inserting control information, and a measuring method and device Download PDFInfo
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Abstract
An inserting method and device for inserting control information, and a measuring method and device. The inserting method comprises the steps of: setting the location parameter and width parameter of the measuring window, inserting the measuring window, measuring contend and control information into the transport stream of the terrestrial digital broadcast in the single frequency network, using the location parameter to determine the starting point of performing the measurement, using the width parameter to determine the time zone of performing the measurement and using the measuring content and control information to control the measurement. The present invention monitors the synchronization quality and coverage quality correctly and flexibly by inserting the measuring control information into the transport stream, it ensures the stability and possibility to control the terrestrial digital broadcast system. Even in the case that some GPS receivers using by the transmitters are failure, the system can still work normally.
Description
Technical field
The present invention relates to the communications field, relate in particular to the device, the system and method that insert measuring control information in received terrestrial digital broadcasting SFN MPTS the inside.
Background technology
SFN is exactly that each transmitter that is distributed on the diverse geographic location sends identical symbol with identical frequency, the identical moment.SFN is a kind of networking mode of received terrestrial digital broadcasting, and this networking mode has higher frequency spectrum service efficiency.
In Digital Terrestrial Television Broadcast SFN based on COFDM (Coded Orthogonal Frequency Division Multiplexing); In DVB-T/H (Digital Video Broadcasting-Terrestial/Handset) SFN, all special equipment---single frequency adapter is realized through adding for frequency and time synchronized.Obtain reference frequency and pps pulse per second signal (1pps) from gps satellite, to the Frequency Synchronization requirement, with all cascade generators in every transmitter of reference frequency driving of GPS (Global Positioning Systems); And through the on-site single frequency adapter of program source in MPEG-2TS (Transport Stream) code stream, add comprise time tag in TS stream, periodically insert MIP (million frame initialization bags, its group character PID (PACKET iDENTIFIER)=15) 101.When setting up SFN, during the TS stream process transmission adaptor of SFN (single-frequency network) adapter output, transmission adaptor must not handled the MIP bag, and just the TS stream to the output of SFN adapter carries out transparent adaptive, transmission.MIP has comprised the transmission parameter of system, is lock in time sign (STS) and maximum delay parameter to the synchronization onwards important function wherein.It is identical that thereby the digital baseband signal in the assurance SFN is transferred to the time delay of distinct transmit point; Through elementary distributed network (PDN) program stream is sent to each cell site then; The single-frequency network synchronization system of each cell site from the MIP of code stream bag extraction time label; The local pps pulse per second signal of receiving of contrast to the time-delay adjustment that code stream adds, is sent code stream into modulator afterwards; Transmit a common time, to realize time synchronized.
The output of single frequency adapter is the mpeg 2 transport stream of a standard, and many packets form one group, constitutes a huge level frame 102 (as shown in fig. 1); Each huge level frame is made up of n packet, and n is an integer, and its size depends in the DVB-T transmission mode; The quantity of RS (Reed-Solomon) bag of each supeframe (Super Frame); N is that the RS data packet number takes advantage of 2 in each supeframe in the 8k pattern, and in the 2k pattern, n is that the RS data packet number takes advantage of 8 in each supeframe.
Fig. 1 representes the insertion method of existing Synchronization Control parameter.Single frequency adapter is inserted into standard time and the standard frequency of GPS in the TS stream.It inserts jumbo frame initial packages (MegaFrame Initialization Packet=MIP) 101 to huge level frame (Mega Frame) 102 the insides that the integral multiple of 8 frames of 8k pattern or 32 cards in the 2k pattern constitutes; Distribute a standard P ID=0x15 for it in the DVB standard; MIP 101 can be inserted into any position of a jumbo frame, and the MIPn that is inserted into n jumbo frame can help to confirm the original position of n+1 jumbo frame through pointer.Indicate that 103 (synchronization_time_stamp=STS) are important parameters the lock in time in the MIP bag; Its content is to be base unit with 100ns, describes time difference of starting point 104 and the actual start 105 of this MIP bag of the 1pps clock of n+1 MIP bag front.The command transmitting TPS relevant information 106 that the SFN signal is arranged in the huge level frame (Mega Frame) 102, such as: signal modulation system, layered mode, protection at interval, the 2k/8k pattern information such as select for use.
Patent application US20050037711; " A kind of digital broadcast networks measurement mechanism and the radio network (Metrology device for the automatic monitoring of a digitalsignal broadcast network and a broadcast network comprising one suchmetrology device) that comprises this measurement mechanism "; the method that provides is a kind of measurement mechanism that can be inserted into existing radio network the inside, and this device is used in the different links of digital broadcasting headend equipment to trunking and terminal equipment.The method of work of this measuring equipment is from the broadcasting code stream, to obtain (decomposition) to go out control information, these control informations is monitored, and according to these control informations broadcasted content is monitored and reported.
The shortcoming of prior art is following:
At present based on the Digital Terrestrial Television Broadcast system of COFDM exist at present signal cover not enough, overlapping area of coverage some areas reception on the contrary unreliable, the networking of variation, synchronization mechanism coordinate a series of problems such as complicacy and poor efficiency, automatic recovery ability difference, this need find the technical scheme of properly settling these problems.Present SFN networking technology and corollary equipment be comparative maturity; But owing to except digital television transmission system, also have an independently gps system, in case lacked GPS information, system is with in paralyzed state; Manual intervention also can't be saved, and this is very unreliable and unsafe behave.
Make the reliable and stable work of SFN, each transmitter all will postpone according to transmitting power and the signal emission that the requirement of received field strength is coordinated separately.Because the difference of geographical environment, city building distribution, coverage and the broadcast transmission condition of various places; Guaranteeing under the prerequisite that signal covers; Various places must be carried out networking according to the characteristics of self and coordinated; At the preprocessed signal of making a start, as far as possible in the limit of power of receiver, guarantee the reception of the area of coverage with condition of acceptance that guarantee to receive end.Co-ordination requires, and simple, reliable, emergent automatic recovery ability is strong.
Patent application US20050037711, " a kind of digital broadcast networks measurement mechanism with comprise the radio network (Metrology device for the automatic monitoring of a digitalsignal broadcast network and a broadcast network comprising one suchmetrology device) of this measurement mechanism " provided a kind of method and apparatus that control information in the broadcast system and signal quality are monitored but this device does not solve the synchronous monitoring and covering monitoring problem under the SFN situation.
The synchronization mechanism that existing SFN uses can only ensure that each launch point synchronously sends broadcast singal, can't measure control to synchronizing quality, the covering quality of SFN.On the practical work, existing received terrestrial digital broadcasting standard is a standard that open circuit sends, and can't satisfy the requirement of closed loop test.
Disclosure of the Invention
Technical problem to be solved by this invention provides a kind of insertion method, device and method of measurement, device that inserts measuring control information, and solving prior art can't be to the synchronizing quality of SFN, the technical problem that covering quality is measured control.
For realizing the foregoing invention purpose; The invention provides a kind of insertion method of inserting measuring control information, its characteristics are, comprising: setting measurement position of window parameter and width parameter; Measurement window, measurement contents and control information are inserted in the MPTS of received terrestrial digital broadcasting SFN; Utilize said location parameter to confirm to implement the starting point of measurement, utilize said width parameter to confirm to implement the time interval of measurement, utilize said measurement contents and control information to come control survey.
Above-mentioned insertion method, its characteristics are that said measurement contents comprises: to the time of advent and the poor measurement time of advent that closes on transmitter, with Synchronization Analysis and the Synchronization Control that is used for SFN; Said control information comprises: emission control information and the transmitter information of closing on.
Above-mentioned insertion method, its characteristics are that said measurement contents also comprises: to closing on the measurement of transmitter in the signal strength signal intensity or the signal power at measurement mechanism place, to be used to analyze the covering quality monitoring of digital broadcast networks; Said emission control information comprises: the measuring signal form of the confession that transmitter will send; Said transmitter information of closing on comprises: the number of closing on transmitter that measure, the identifier that closes on transmitter perhaps close on the Pseudo-Random Noise Code of transmitter use, the frequency point information of closing on the transmitter use.
Above-mentioned insertion method, its characteristics are that said measurement contents also comprises: the measurement of frequency offset estimating and idle frequence.
Above-mentioned insertion method; Its characteristics are; One of in the following manner said measurement window, measurement contents and control information are inserted in the MPTS of received terrestrial digital broadcasting SFN: mode one; As the part of the jumbo frame initial package in the said MPTS, be inserted into the location parameter of measurement window and width parameter in some or all jumbo frame initial packages to said measurement contents and control information; Mode two is inserted the location parameter of measurement window and width parameter in the said MPTS as the independent packets of information that has group character.
In order better to realize the object of the invention; The present invention also provides a kind of insertion device that inserts measuring control information; Its characteristics are, comprise the insertion unit that is arranged in the single frequency adapter, and said insertion unit comprises that information generates part and information writes part; Said information generates part and is used to realize control the code table mapping that requires to meet jumbo frame initial package form from measuring, and said information writes part and is used for being written to the jumbo frame initial package to the code table that meets jumbo frame initial package form; Said information generates part setting measurement position of window parameter and width parameter; Said information writes part and measurement window, measurement contents and control information is inserted in the MPTS of received terrestrial digital broadcasting SFN; Thereby utilize said location parameter to confirm to implement the starting point of measurement; Utilize said width parameter to confirm to implement the time interval of measurement, utilize said measurement contents and control information to come control survey.
In order better to realize the object of the invention; The present invention also provides a kind of and has carried out measuring method for measuring according to above-mentioned insertion method; Its characteristics are, comprising: location parameter, width parameter and said measurement contents and the said control information of from the MPTS of said received terrestrial digital broadcasting SFN, obtaining measurement window; Confirm the starting point that enforcement is measured through said location parameter, confirm the time interval that enforcement is measured, in the width range of said measurement window, measure according to said measurement contents and said control information through said width parameter.
In order better to realize the object of the invention; The present invention also provides a kind of measurement mechanism of measuring according to above-mentioned method of measurement; Its characteristics are; Comprise the antenna, multiband bank of filters, multiband passage, parameter measurement unit and the measure-controlling unit that are linked in sequence, said measure-controlling unit also connects said multiband passage; Said measure-controlling unit obtains location parameter, width parameter and said measurement contents and the said control information of measurement window from the MPTS of said received terrestrial digital broadcasting SFN; Confirm the starting point that enforcement is measured through said location parameter, confirm the time interval that enforcement is measured, in the width range of said measurement window, measure according to said measurement contents and said control information through said width parameter.
Above-mentioned measurement mechanism, its characteristics are that said antenna is the multiband aerial combination that a multiband aerial or a plurality of antenna are formed; Said multiband passage is made up of the ultra broadband amplifier or is made up of low noise amplifier; Said parameter measurement unit is made up of baseband processing module, has time domain and frequency domain disposal ability, have signal amplitude and the time of advent parameter measurement capability; Said measure-controlling unit is made up of digital processing unit, controls said multiband passage, said parameter measurement unit gets into corresponding measurement pattern, and sends the measurement result of said parameter measurement unit to network.
In order better to realize the object of the invention; The present invention also provides a kind of digital broadcast signal monitoring system that includes above-mentioned measurement mechanism; Its characteristics are, comprise that the bilayer of being made up of main emission layer and auxiliary emission layer is collaborative with the digital broadcasting web frame that takes place frequently and penetrate; Said main emission layer can be made up of by tranmitting frequency electromagnetic master transmitter identical, that cover certain zone a plurality of; Said auxiliary emission layer can be made up of by tranmitting frequency electromagnetic booster transmitter identical, that cover certain zone a plurality of, includes said measurement mechanism in the said booster transmitter, and said measurement mechanism is measured the signal of said master transmitter emission.
The invention has the advantages that: the present invention is through inserting measuring control information in TS stream; Can keep watch on synchronizing quality, the covering quality of terrestrial digital broadcasting signal accurately, flexibly, according to the monitoring result of synchronizing quality, covering quality launch time of transmitter and emissive porwer dynamically adjusted and guaranteed the stable, controlled of received terrestrial digital broadcasting system.Even if under the situation of the GPS receiver fault that some transmitter uses, system still can operate as normal.
In addition; From angle to the radio network monitoring; The invention provides a cover wide coverage, system that the networking cost is low, fail safe, quality, the content of broadcasting signal in the radiated television network are monitored in real time, these monitorings comprise: 1) timely awareness network ruuning situation; Find the harmful interference signal, and accurately understand the position that has an accident; 2) broadcast quality (like technical parameters such as level, carrier-to-noise ratios) is monitored, in time find the great differential mode that each programs of front end broadcasts, gather, handle, analyze Monitoring Data; 3) each programs content of each front end being broadcasted is carried out itinerant monitor system or the monitoring of logging on to a TV channel, and in time understands the channel of broadcast and the programme content of broadcast.
Brief Description Of Drawings
Fig. 1 is the existing sketch map that in MPEG-2TS stream, inserts the method for MIP bag;
Fig. 2 is a kind of sketch map that inserts the method for measuring control information provided by the invention;
Fig. 3 is the sketch map of a kind of digital broadcast signal measurement mechanism provided by the invention;
Fig. 4 is a kind of sketch map that in DMBTS stream, inserts the instance of measurement window position and window width provided by the invention;
Fig. 5 is the sketch map of a kind of digital broadcast signal monitoring system instance provided by the invention.
Realize best mode of the present invention
Below in conjunction with accompanying drawing and embodiment the present invention is explained further details.
Angle from digital broadcasting SFN steady operation; In digital broadcast transmission stream, insert measuring control information and can realize that measurement contents comprises to the measurement of the signal of the signal of the broadcast transmitter emission on upper strata and the emission of the broadcast transmitter in the same aspect: the synchronized relation between the time of advent poor, signal strength signal intensity, each transmitter etc.
In addition; Introduce after the measurement capability; Even if the gps signal forfeiture that certain or some transmitters use or unusual; These transmitters also can utilize the signal of the broadcast transmitter emission on the upper strata that self measures, the signal of the emission of the broadcast transmitter in the same aspect and the time relationship between this transmitter, estimate the launch time of oneself, ensure that the work of SFN can not paralysed.
From angle to the radio network monitoring; Present needs one cover wide coverage, the system that the networking cost is low; Fail safe, quality, content to broadcasting signal in the radiated television network are monitored in real time; These monitorings comprise: 1) timely awareness network ruuning situation, and find the harmful interference signal, and accurately understand the position that has an accident; 2) broadcast quality (like technical parameters such as level, carrier-to-noise ratios) is monitored, in time find the great differential mode that each programs of front end broadcasts, gather, handle, analyze Monitoring Data; 3) each programs content of each front end being broadcasted is carried out itinerant monitor system or the monitoring of logging on to a TV channel, and in time understands the channel of broadcast and the programme content of broadcast.
Enforcement of the present invention mainly comprises A), B), C) three parts.
A) part: a kind of method of in mpeg 2 transport stream TS, inserting measuring control information
The basic parameter that inserts is as shown in Figure 2, comprises the steps:
The first step is confirmed the method for expressing of measurement window
See Fig. 2, the expression of measurement window comprises: the width (parameter) 205 of the position of measurement window (parameter) 204 and measurement window;
The position of measurement window (parameter) 204 can be represented with the starting point of window, also can represent with the central point of window, usually, uses measurement window starting point t0 to represent the time location 201 of measurement window;
The time interval TW (202) of measurement is implemented in the width of measurement window (parameter) 205 expressions;
Second goes on foot, and confirms the position and the window size of measurement window;
The position 201 of measurement window 202 (the starting point t0 of window) is used and is represented with respect to the time t0 of GPS pulse per second (PPS) 104, sees Fig. 2; T0 can be the time with respect to several pulse per second (PPS)s before the measurement window 202, and usually, t0 is the time with respect to first pulse per second (PPS) before the measurement window 202;
The time interval TW (202) of measurement is implemented in the width of measurement window (parameter) 205 expressions; The width of TW (202) can be the part of an OFDM character length overall; Like width is the protection interval delta, also can be the integral multiple of an OFDM character length overall, like 1～N OFDM character length overall;
In the 3rd step, confirm measurement contents and the measuring control information that to insert
At first, confirm the basic measurement contents that to measure.
Basic measurement contents comprises: close on the transmitter (the transmitter here can be the transmitter of digital television broadcasting, also can be the transmitter of other system) time of advent (TOA:TIME OF ARRIVAL) and the time of advent poor (TDOA:TIME DIFFERENCE OF ARRIVAL) and measure; This measuring amount is used for SFN Synchronization Analysis and Synchronization Control.
Further; (the transmitter here can be the transmitter of digital television broadcasting to close on transmitter; Also can be the transmitter of other system) at the signal strength signal intensity or the signal power measurement at measurement mechanism place, the covering quality monitoring that is used to analyze digital broadcast networks (when the transmitter to other system, as is operated in the GSM that uses frequency spectrum in the television broadcast band flexibly; When measuring, just can be used for the covering quality analysis of this system);
Further, measurement contents can also comprise: frequency offset estimating, idle frequence are measured (when the uncertain frequency range of certain operating position is measured, being exactly the monitoring to spectrum environment);
Then, confirm in order to accomplish the control information that above-mentioned measurement contents need be sent.
Basic control information comprises: emission control information.
Emission control information comprises: the measuring signal form of the confession that transmitter will send, and the sort signal form can be carried with TS, also can produce at the transmitter place, and these signal forms identify with coded system;
Measuring control information comprises: the transmitter information of closing on; The transmitter that closes on here is meant near one or more transmitter certain digital broadcast transmitter that is present in measurement mechanism or has measurement mechanism; These transmitters usually are meant digital broadcast transmitter; Perhaps having the transmitter of emission digital broadcast signal function, also can be the transmitter of other types
The transmitter information of closing in the measuring control information comprises: the number of closing on transmitter that measure, the identifier (ID) that closes on transmitter perhaps close on PN (Pseudo-Random Noise Code, the Pseudonoise Code) sign indicating number of transmitter use, the frequency point information of closing on the transmitter use;
The 4th step, definite mode of inserting measuring control information;
Can insert measuring control information in any position of the huge level frame 102 of the mpeg 2 transport stream that constitutes standard,
A kind of inserted mode is that position (parameter) 204 and the width (parameter) 205 of measurement window measurement window can be the part as jumbo frame initial package (MIP) 101; The width (parameter) 205 of the position of measurement window (parameter) 204 and measurement window during as jumbo frame initial package (MIP) 101 a part of; Can be that each (MIP) 101 inserts measuring control information continuously, also can only in part jumbo frame initial package (MIP) 101, insert measuring control information.
A kind of inserted mode is that position (parameter) 204 and width (parameter) 205 of measurement window measurement window inserted in the mpeg 2 transport stream as the independent packets of information that has PID.
B) part: a kind of device of realizing that measuring control information is inserted
A kind of device of realizing that measuring control information is inserted is formed by increasing measuring control information insertion unit in the single frequency adapter.
Measuring control information is inserted the unit and is comprised that measuring control information generates and measuring control information writes.
Measuring control information generates part and realizes controlling the code table mapping that requires to meet the MIP form from measuring, and is written to jumbo frame initial package (MIP) to the code table that meets jumbo frame initial package (MIP) form in the measuring control information ablation process.
C) part: a kind of digital broadcast signal measurement mechanism.
The digital broadcast signal measurement mechanism is used for parameters such as the time of advent of the digital broadcast signal of its position, signal amplitude, working frequency points are measured.Realize that the device that measuring control information is inserted is inserted into measuring control information in the transport stream TS; The digital broadcast signal measurement mechanism then obtains these measuring control information from transport stream TS; According to the mode that provides in the measuring control information (, needing the transmitter number and the ID of transmitter measured) like the moment of start measuring obtain the interior appointment of measuring control information measurement parameter (as each close on transmitter signal reach the time difference, each closes on the signal amplitude etc. of transmitter).
The digital broadcast signal measurement mechanism comprises antenna 301, multiband bank of filters 302, multiband passage 303, parameter measurement unit 304, measure-controlling unit 305.
Measure-controlling unit 305 obtains the measuring control information the jumbo frame initial package (MIP) 101 from the MPEG-2 demultiplexing unit, as, the time interval TW (202) that obtains measurement window starting point t0 (201) and implement to measure;
Various measuring control information in 305 pairs of jumbo frame initial packages of measure-controlling unit (MIP) 101 are resolved, and the corresponding measurement of control.
A kind of implementation of digital broadcast signal measurement mechanism is: receiver chip structure multiband passage 303, the parameter measurement unit 304 of utilizing the business terminal use of using in the terminal.This implementation method can reduce the realization cost of digital broadcast signal measurement mechanism, shortens design time.Such as, use the tuner of mobile TV receiver or use UWB to intercept and capture and bring in structure multiband passage 303 before the machine of searching and television broadcasting signal is received, measures.
The digital broadcast signal measurement mechanism can or be total to the location with the digital broadcast transmitter comprehensive Design and install, and also can and be installed separately with the digital broadcast transmitter separate design.
The digital broadcast signal measurement mechanism is before receiving the measurement control command; Periodically the television broadcasting signal of its position is measured; After transmitter receives measuring command; In order to reach to closing on the measurement effect that transmitter transmits, can close local transmitter, its shut-in time is consistent with the measurement window width;
The digital broadcast signal measurement mechanism parses the ID of the measurement mechanism of implementing measurement from emission control information; (or ID of the base station of its support); If the digital broadcast signal measurement mechanism obtains starting the information that this device is measured, just begin in the window of regulation, to measure;
Ground digital multimedia TV broad cast (DMB-T) agreement is based on the TDS-OFDM technology, and its physical channel frame structure is as shown in Figure 4.Frame structure is classification, and 1 basic frame structure is called 1 signal frame.The frame crowd is defined as 255 signal frames, and its first frame definition is a frame crowd head.Signal frame among the frame crowd has unique frame number, and label is from 0～254, and signal frame number (FN) is encoded in the frame synchronization PN sequence of current demand signal frame.
Superframe is defined as a framing crowd, and the top layer of frame structure is called the superframe crowd.Superframe is numbered, from 0 to largest frames crowd number.Hyper Frame Number (SFN) is encoded in first frame crowd head of superframe with superframe crowd number (SFGN).
Superframe crowd number (SFGN) is defined as the calendar date of superframe pocket transmission, and the superframe crowd is to carry out periodicity the cycle to repeat with a consecutive days, and it is encoded as preceding two bytes in first frame crowd head of a superframe among the downgoing line superframe crowd.At Pacific standard time (PST) or Beijing time 0:0:0AM, physical channel frame structure is reset and begins a new superframe crowd.
A signal frame is made up of two parts: frame synchronization and frame.Frame synchronizing signal adopts the random sequence of walsh codes, to realize many identification of base stations.Frame synchronization comprises preamble, PN sequence and back synchronously.Unlike signal frame among the signal frame crowd has the different frame synchronization signal.So frame synchronization can be made the frame synchronization characteristic of a distinctive signal frame and be used for identification.Frame synchronization adopt BPSK (binary phase shift keying) modulation with obtain stable synchronously.
The baseband signal of frame is an OFDM (OFDM) piece.An OFDM piece can further be divided into protection interval and a DFT (DFT) piece, and is as shown in Figure 4.The DFT piece has 3780 samplings in its time domain, they are contrary discrete fourier transforms of 3780 number of sub-carrier in the frequency domain.
For to synchronized relation and signal strength measurement between each ground digital multimedia TV broad cast (DMB-T) under the single frequency network, take following steps, see Fig. 4:
At first, each digital broadcast signal measurement mechanism had obtained ID number or the PN sequential value that use adjacent base station before measuring, and this acquisition can be pre-configured, also can be through the TS flow transmission;
1) the starting point of the starting point of certain frame synchronization in ground digital multimedia TV broad cast (DMB-T) the physical channel frame interval 401 as measurement window, this starting point is with respect to the time difference t0 (like the mark among Fig. 2 201) of the GPS pulse per second (PPS) value as the position (parameter) 204 of measurement window;
2) the width TW (like mark in Fig. 2 202) of the duration of certain frame synchronization in ground digital multimedia TV broad cast (DMB-T) the physical channel frame interval 401 as measurement window, this width is as the value of the width (parameter) 205 of measurement window;
3) the digital broadcast signal measurement mechanism parses the ID of the measurement mechanism of implementing measurement from emission control information, and (or ID of the base station of its support),
If the digital broadcast signal measurement mechanism obtains starting the information that this device is measured, just begin in the window of regulation, to measure;
If what the digital broadcast signal measurement mechanism obtained is the information of adjacent base station initiated measurement; Just in the window of regulation; According to the PN sequence that the own local transmitter ID of expression is sent in the instruction of measuring control information, this PN sequence supplies to close on the measurement mechanism reception and goes out parameters of interest according to this PN sequence measuring;
4) the digital broadcast signal measurement mechanism is in the window 401 of regulation, to signal amplitude (or power) measure, the time of advent difference measurements;
A kind of metering system is the PN sequence of using according to each adjacent base station to be measured of knowing in advance; Produce these PN sequences by measurement mechanism; Use the PN sequence of these generations and signal that measurement mechanism receives to carry out related operation then; Its output correlation peak is exactly the due in of signal, and the difference of different PN sequence correlation peaks is exactly that different transmitters is poor in the time of advent at measurement mechanism place.
Under multi-path environment, the method for the multiple Estimated Time of Arrival and time of advent difference is arranged, like head footpath method, centroid method, a kind of Estimated Time of Arrival and the time of advent, poor method was to use the first footpath that monitors as the time of advent.
The collaborative digital broadcasting web frame of penetrating with taking place frequently of a kind of bilayer is made up of with auxiliary emission layer 502 main emission layer 501.
The electromagnetic wave of the master transmitters emission in the main emission layer 501, like 501a, the overlay area greater than the electromagnetic wave of the booster transmitters emission in the auxiliary emission layer 502, like 502a, the overlay area.Usually; In the electromagnetic wave region covered of main emission layer 501 interior master transmitter emissions, there is the electromagnetic wave of several booster transmitters emissions, such as; In electromagnetic wave 501a region covered, there are electromagnetic wave 502a, 502b, 502c etc.; And, in the electromagnetic wave region covered of main emission layer 501 interior master transmitter emissions, have several digital broadcast signal measurement mechanisms of the present invention;
The electromagnetic wave of the master transmitter emission in the main emission layer 501 has identical frequency with the electromagnetic wave that the booster transmitter in the auxiliary emission layer 502 is launched.It is flowing with a kind of broadcast codes that the electromagnetic wave that master transmitter in the main emission layer 501 is launched carries identical a kind of method of information symbol with the electromagnetic wave that the booster transmitters in the auxiliary emission layer 502 are launched; Through distribution network 503; Send to all master transmitters and all booster transmitters in the auxiliary emission layer 502 in the main emission layer 501; Booster transmitter and its auxiliary master transmitter are with specific synchronized relation, sending through distribution network 503 information symbols with the master transmitter emission that send here.
A kind of implementation of the master transmitter in the main emission layer 501 is to use ground digital multimedia TV broad cast (DMB-T is based on the TDS-OFDM technology);
A kind of implementation of the master transmitter in the main emission layer 501 is to use the transmitter DVB-T of received terrestrial digital broadcasting;
A kind of implementation of the master transmitter in the main emission layer 501 is to use the transmitter DVB-H of received terrestrial digital broadcasting;
A kind of implementation of the master transmitter in the main emission layer 501 is to use the transmitter of the cellular mobile communication base station with broadcast transmission ability;
Transmitters in the auxiliary emission layer 502 have with main emission layer 501 in identical frequency spectrum and the code modulation mode of master transmitter;
A kind of mode of operation of the measuring system that this instance provides is that the signal of the master transmitter emission in the main emission layer 501 is measured, and this is the innovative content of this instance, and its method is:
The transmitter that has digital broadcast signal measurement mechanism of the present invention in the auxiliary emission layer 502 is in the measurement window (the time interval TW 202 of expression in the position 201 (the starting point t0 of window) of the position of measurement window (parameter) 204 expressions, the width (parameter) 205 of measurement window) that jumbo frame initial package (MIP) 101 carries, to measuring the amplitude and the time of advent (poor) of the signal of the master transmitters emission in the main emission layer 501;
In order to cooperate the measurement of the digital broadcast signal measurement mechanism in the auxiliary emission layer 502; The transmitter id information that will insert in measurement window master transmitter in the measuring control information that jumbo frame initial package (MIP) 101 carries (the PN sequence with specific is represented) stipulates that master transmitter sends the signal form of defined in measurement window;
The value of the time interval TW 202 of expression is 1 complete OFDM character total length in the width (parameter) 205 of the measurement window that jumbo frame initial package (MIP) 101 carries; In such OFDM character total length; Transmitter in the auxiliary emission layer 502 stops the collaborative emission to main emission layer, so that the digital broadcast signal measurement mechanism is accurately measured the signal of main emission layer emission;
In the auxiliary emission layer 502 digital broadcast signal measurement mechanism of the present invention in measurement window to the id information (the PN sequence with specific is represented) of the master transmitter in the main emission layer 501; The method of measuring is: the specific PN sequence (having the transmitter id information) that the master transmitter that the digital broadcast signal measurement mechanism receives with local PN sequence that produces and measurement mechanism sends is carried out related operation; Its output correlation peak is exactly the due in of signal, and the difference of different PN sequence correlation peaks is exactly that different transmitters is poor in the time of advent at measurement mechanism place.
Measurement result sends to digital broadcast signal monitoring center through distribution network, is used for the real-time monitoring to radio network wireless coverage quality.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Industrial applicability
The present invention is through inserting measuring control information in TS stream; Can keep watch on synchronizing quality, the covering quality of terrestrial digital broadcasting signal accurately, flexibly; Monitoring result according to synchronizing quality, covering quality is dynamically adjusted the launch time and the emissive porwer of transmitter, has guaranteed the stable, controlled of received terrestrial digital broadcasting system.Even if under the situation of the GPS receiver fault that some transmitter uses, system still can operate as normal.The present invention is applicable to the technical field of received terrestrial digital broadcasting SFN, and the inventive method is fit to exist other each fields of similar application equally.
Claims (8)
1. an insertion method of inserting measuring control information is characterized in that, comprising: setting measurement position of window parameter and width parameter; Measurement window, measurement contents and control information are inserted in the MPTS of received terrestrial digital broadcasting SFN; Utilize said location parameter to confirm to implement the starting point of measurement, utilize said width parameter to confirm to implement the time interval of measurement, utilize said measurement contents and control information to come control survey; Wherein
Said measurement contents comprises: to the time of advent and the poor measurement time of advent that closes on transmitter; With Synchronization Analysis and the Synchronization Control that is used for SFN; To closing on the measurement of transmitter, to be used to analyze the covering quality monitoring of digital broadcast networks in the signal strength signal intensity or the signal power at measurement mechanism place;
Said control information comprises: emission control information and the transmitter information of closing on;
Said emission control information comprises: the measuring signal form of the confession that transmitter will send;
Said transmitter information of closing on comprises: the number of closing on transmitter that measure, the identifier that closes on transmitter perhaps close on the Pseudo-Random Noise Code of transmitter use, the frequency point information of closing on the transmitter use.
2. insertion method according to claim 1 is characterized in that, said measurement contents also comprises: the measurement of frequency offset estimating and idle frequence.
3. insertion method according to claim 1 and 2 is characterized in that, one of in the following manner said measurement window, measurement contents and control information is inserted in the MPTS of received terrestrial digital broadcasting SFN:
Mode one as the part of the jumbo frame initial package in the said MPTS, is inserted into the location parameter of measurement window and width parameter in some or all jumbo frame initial packages to said measurement contents and control information;
Mode two is inserted the location parameter of measurement window and width parameter in the said MPTS as the independent packets of information that has group character.
4. an insertion device that inserts measuring control information is characterized in that, comprises the insertion unit that is arranged in the single frequency adapter, and said insertion unit comprises that information generates part and information writes part;
Said information generates part and is used to realize control the code table mapping that requires to meet jumbo frame initial package form from measuring, and said information writes part and is used for being written to the jumbo frame initial package to the code table that meets jumbo frame initial package form; Said information generates part setting measurement position of window parameter and width parameter; Said information writes part and measurement window, measurement contents and control information is inserted in the MPTS of received terrestrial digital broadcasting SFN; Thereby utilize said location parameter to confirm to implement the starting point of measurement; Utilize said width parameter to confirm to implement the time interval of measurement, utilize said measurement contents and control information to come control survey.
5. an insertion method according to claim 1 is carried out measuring method for measuring; It is characterized in that, comprising: location parameter, width parameter and said measurement contents and the said control information of from the MPTS of said received terrestrial digital broadcasting SFN, obtaining measurement window; Confirm the starting point that enforcement is measured through said location parameter, confirm the time interval that enforcement is measured, in the width range of said measurement window, measure according to said measurement contents and said control information through said width parameter.
6. measurement mechanism that method of measurement according to claim 5 is measured; It is characterized in that; Comprise the antenna, multiband bank of filters, multiband passage, parameter measurement unit and the measure-controlling unit that are linked in sequence, said measure-controlling unit also connects said multiband passage;
Said measure-controlling unit obtains location parameter, width parameter and said measurement contents and the said control information of measurement window from the MPTS of said received terrestrial digital broadcasting SFN; Confirm the starting point that enforcement is measured through said location parameter, confirm the time interval that enforcement is measured, in the width range of said measurement window, measure according to said measurement contents and said control information through said width parameter.
7. measurement mechanism according to claim 6 is characterized in that, said antenna is the multiband aerial combination that a multiband aerial or a plurality of antenna are formed; Said multiband passage is made up of the ultra broadband amplifier or is made up of low noise amplifier; Said parameter measurement unit is made up of baseband processing module, has time domain and frequency domain disposal ability, have signal amplitude and the time of advent parameter measurement capability; Said measure-controlling unit is made up of digital processing unit, controls said multiband passage, said parameter measurement unit gets into corresponding measurement pattern, and sends the measurement result of said parameter measurement unit to network.
8. a digital broadcast signal monitoring system that includes the described measurement mechanism of claim 6 is characterized in that, comprises that the bilayer of being made up of main emission layer and auxiliary emission layer is collaborative with the digital broadcasting web frame that takes place frequently and penetrate;
Said main emission layer can be made up of by tranmitting frequency electromagnetic master transmitter identical, that cover certain zone a plurality of;
Said auxiliary emission layer can be made up of by tranmitting frequency electromagnetic booster transmitter identical, that cover certain zone a plurality of, includes said measurement mechanism in the said booster transmitter, and said measurement mechanism is measured the signal of said master transmitter emission.
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| PCT/CN2006/000674 WO2007118348A1 (en) | 2006-04-14 | 2006-04-14 | An inserting method and device for inserting control information, and a measuring method and device |
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