CN102882622A - Method and device for analyzing transmitter identification information - Google Patents

Abstract

The invention relates to a method and a device for analyzing transmitter identification information. The method includes: extracting first data Y1 including the transmitter identification information from invisible symbols of a received digital audio broadcasting stream and performing Fourier transformation for the first data Y1 so that second data yi are obtained; according to a DAB (digital audio broadcasting) transmission mode, extracting data B at the corresponding positions of current sub-identifiers c from the second data yi; obtaining style values of the second data yi according to amplitude values of the data B, and using the style values to determine a main identifier p corresponding to the current sub-identifiers c; and determining the transmitter identification information according to the main identifier p and the sub-identifiers c. By the method and the device, the transmitter identification information is effectively identified, storage resources can be saved, cost is lowered, and reliability of TII (transmitter identification information) signal detection results is improved.

Description

The analytic method of transmitter identification information and device

Technical field

The present invention relates to digital communication technology field, relate in particular to a kind of analytic method and device of transmitter identification information.

Background technology

Digital audio broadcasting (Digital Audio Broadcast, DAB), the third generation broadcasting after AM, FM case of conventional analog broadcast, refer to the audio signal after the digitlization, vision signal and various data-signal, under digital state, carry out the processing such as various codings, modulation, transmission, and by the cell site, ground, reach high-quality broadcasting and data information transmission purpose with the emission digital signal.The DAB system is comprised of the single-frequency module, by adopting orthogonal frequency division multiplexi (OFDM), can under extremely low distortion rate, transmit the broadcasting of high-quality stereo or monophone, also can transmit text and data, solve case of conventional analog broadcast and receive bad and interference problem, the data, services of accessible reception is provided.

In the DAB system, know the source that receives signal in order to make things convenient for receiving terminal, usually can in signal, add one section transmitter identification information (TII), each transmitter in the unifrequency network is distributed a clearly sign.The TII signal is comprised of the paired adjacent carrier of some in the OFDM symbol, selected carrier wave is by two parameter-definitions of marking emitter, comprise model number and numerical value, these two parameters correspond to respectively main identifier p and the sub-identifier c of transmitter, are used for the description of the characteristic of TII.In the TII signal carrier wave sign of actual selection specific transmitter, namely after having determined model number and numerical value, also just determined corresponding transmitter, thereby utilized the TII signal can differentiate the signal strength signal intensity of sender unit identification number and each transmitter, and then judged that receiving terminal receives the source of signal.

Therefore need to provide a kind of transmitter identification information is resolved, thereby realize that fast searching is to corresponding transmitter identification information.

Summary of the invention

The purpose of this invention is to provide a kind of analytic method and device of transmitter identification information, transmitter identification information is carried out effectively identification, can save storage resources, reduce cost, improve the reliability of TII signal detecting result.

For achieving the above object, the invention provides a kind of analytic method of transmitter identification information, described method comprises:

From the sky symbol that the digital audio broadcasting that receives is flowed, extract the first data Y that contains transmitter identification information _i

To described the first data Y _iCarry out Fourier transform and obtain the second data y _i

According to the transmission mode of digital audio broadcasting DAB, from described the second data y _iThe data B of the current sub-identifier c correspondence position of middle extraction;

Range value according to described data B obtains described the second data y _iPattern value, utilize described pattern value to determine primary identifier p corresponding to described current sub-identifier c;

Determine described transmitter identification information according to described primary identifier p and sub-identifier c.

On the other hand, the present invention also provides a kind of resolver of transmitter identification information, and described device comprises:

The first extraction unit is used for extracting the first data Y that contains transmitter identification information from the sky symbol that the digital audio broadcasting that receives is flowed _i, and to described the first data Y _iCarry out Fourier transform and obtain the second data y _i

The second extraction unit is used for the transmission mode according to digital audio broadcasting DAB, from described the second data y _iThe data B of the current sub-identifier c correspondence position of middle extraction;

Resolution unit, the range value that is used for the described data B that extracts according to described the second extraction unit obtains described the second data y _iPattern value, utilize described pattern value to determine primary identifier p corresponding to described current sub-identifier c;

Determining unit is used for determining described transmitter identification information according to described primary identifier p and sub-identifier c.

The analytic method of transmitter identification information provided by the invention and device are determined corresponding primary identifier p by given sub-identifier c, carry out confidence level again and detect, and obtain the high testing result of accuracy rate thereby resolve.Analytic method provided by the invention and device, because each to given sub-identifier c, only extract a small amount of valid data, can save storage resources, reduce cost, and to the transmitter identification information employing confidence level detection that parsing obtains, effectively improved the reliability of TII signal detecting result.

Description of drawings

Fig. 1 is the frame structure schematic diagram of digital audio broadcasting DAB transport layer;

Fig. 2 is the schematic diagram of transmission mode II TII signal in the constant situation of sub-identifier c value;

Fig. 3 is the schematic diagram of transmission mode II TII signal in the constant situation of primary identifier p value;

The analytic method flow chart of the transmitter identification information that Fig. 4 provides for the embodiment of the invention one;

The resolver schematic diagram of the transmitter identification information that Fig. 5 provides for the embodiment of the invention two.

Embodiment

Below by drawings and Examples, technical scheme of the present invention is described in further detail.

Fig. 1 is the frame structure schematic diagram of digital audio broadcasting DAB transport layer, and as shown in Figure 1, the transmission system of digital audio broadcasting mainly is comprised of three transmission channels, comprises MSC (MSC), fast information channel in dab receiver (FIC) and synchronizing channel.

MSC is used for transmitting audio frequency and data service component, and MSC is time-interleaved (Interwave) data channel, and this channel is divided into some subchannels that even or non-homogeneous error protection are arranged, and they independently carry out convolutional encoding separately.Every sub-channels can transmit one or several service components.The tissue of subchannel and service components is called multiplexing configuration.

FIC is used for receiver quick obtaining information, especially is used for sending multiplexing configuration information (MCI) and optional choose a job affair information and data service.FIC is one to be had fixing even error protection, not to have the data channel that the elapsed time interweaves.

Synchronizing channel is used for the basic demodulation function in transmission system, as transmission frame synchronously, automatic frequency control, channel status is estimated and transmitter identification etc.

According to the consensus standard of DAB, TII transmits in synchronizing channel, and the TII signal is optional.If the TII signal is arranged in transmitting, then fill at null symbol NULL, and fill once every a NULL.Particularly, the TII signal can be expressed as:

$S_{\mathrm{TII},k}\left(t\right)=\mathrm{Re}\{e^{j2\mathrm{\π}{f}_{c}t}+\underset{m=-\∞}{\overset{+\∞}{\mathrm{\Σ}}}\underset{k=-K/2}{\overset{K/2}{\mathrm{\Σ}}}{z}_{m,0,k}\×g_{\mathrm{TII},k}(t-m{T}_F)\}$ (formula 1)

Wherein, $g_{\mathrm{TII},k}(t-m{T}_F)=e^{2\mathrm{\πjk}(t-T_{\mathrm{NULL}}+T_U)/T_U}\×\mathrm{Rec}(t/T_{\mathrm{NULL}}).$ z _{M, 0, k}Be and the relevant plural number of carrier wave k of sky symbol NULL, when the TII signal did not transmit, it equaled 0 during transmission frame m, and when the TII signal transmitted, for transmission frame m, its value was released by the value of p and c.z _{M, 0, k}Value can be expressed as:

(formula 2)

Wherein,

Be phase value corresponding to carrier wave k, A _{C, p}(k) value is by different transmission mode definition.

Consensus standard according to DAB; DAB has four kinds of transmission modes (mode of operation); four kinds of patterns have different parameters, comprise the bit number of bandwidth, carrier spacing, carrier wave sum, significant character duration, protection interval, each OFDM symbol, firing frequency frequency etc.Four kinds of patterns are applicable to different occasions: transmission mode I and are used for VHF ground synchronous net, transmission mode II is used for individual transmitter and the following satellite/terrestrial broadcasting of 1.5GHz, the transmission mode formula III is used for satellite transmission, terrestrial transmission, the following cable transmission of 3GHz, and transmission mode IV is used for UHF ground synchronous net.

For transmission mode I, effectively sub-carrier number is that to fill each be the nil symbol of each transmission frame of forming of the CIF of 0,1,2,3 (moulds 8) by public interleaving frame (CIF) Counter Value to 1536, TII signal.

Transmission mode I:

$A_{c,p}\left(k\right)=\left\{\begin{array}{cc}\underset{b=0}{\overset{7}{\mathrm{\&Sigma;}}}\mathrm{\&delta;}(k,-768+2c+48b)\&times;a_b\left(p\right)& -768\&le;k<-384\\ \underset{b=0}{\overset{7}{\mathrm{\&Sigma;}}}\mathrm{\&delta;}(k,-384+2c+48b)\&times;a_b\left(p\right)& -348\&le;k<0\\ \underset{b=0}{\overset{7}{\mathrm{\&Sigma;}}}\mathrm{\&delta;}(k,1+2c+48b)\&times;a_b\left(p\right)& 0<k\&le;384\\ \underset{b=0}{\overset{7}{\mathrm{\&Sigma;}}}\mathrm{\&delta;}(k,385+2c+48b)\&times;a_b\left(p\right)& 385<k\&le;768\end{array}\right.$ (formula 3)

Wherein, A _{C, p}(0)=A _{C, p}(769)=0,0≤c≤23.

For transmission mode II, effectively sub-carrier number is that to fill each be the nil symbol of each transmission frame of forming of the CIF of 0 (mould 2) by the CIF Counter Value to 384, TII signal.

Transmission mode II:

$A_{c,p}\left(k\right)=\underset{b=0}{\overset{3}{\mathrm{\&Sigma;}}}\mathrm{\&delta;}(k,-192+2c+48b)\&times;a_b\left(p\right)+\underset{b=4}{\overset{7}{\mathrm{\&Sigma;}}}\mathrm{\&delta;}(k,-191+2c+48b)\&times;a_b\left(p\right)$ (formula 4)

Wherein, A _{C, p}(193)=0,0≤c≤23.

For the transmission mode formula III, effectively sub-carrier number is that to fill each be the nil symbol of each transmission frame of forming of the CIF of 0 (mould 2) by the CIF Counter Value to 192, TII signal.

The transmission mode formula III

$A_{c,p}\left(k\right)=\underset{b=0}{\overset{1}{\mathrm{\&Sigma;}}}\mathrm{\&delta;}(k,-96+2c+48b)\&times;a_b\left(p\right)+\underset{b=2}{\overset{3}{\mathrm{\&Sigma;}}}\mathrm{\&delta;}(k,-95+2c+48b)\&times;a_b\left(p\right)$ (formula 5)

Wherein, A _{C, p}(97)=0,0≤c≤23.

For transmission mode IV, effectively sub-carrier number is that to fill each be the nil symbol of each transmission frame of forming of the CIF of 0,1 (mould 4) by the CIF Counter Value to 756, TII signal.

Transmission mode IV

$A_{c,p}\left(k\right)=\left\{\begin{array}{cc}\underset{b=0}{\overset{7}{\mathrm{\&Sigma;}}}\mathrm{\&delta;}(k,-384+2c+48b)\&times;a_b\left(p\right)& -384\&le;k<0\\ \underset{b=0}{\overset{7}{\mathrm{\&Sigma;}}}\mathrm{\&delta;}(k,1+2c+48b)\&times;a_b\left(p\right)& 0<k\&le;384\end{array}\right.$ (formula 6)

Wherein, A _{C, p}(0)=A _{C, p}(385)=0,0≤c≤23.

Transmission mode I, II, a of IV _b(p) as shown in table 1 below:

Table 1

The a of transmission mode formula III _b(p) as shown in table 2 below:

Table 2

Desirable TII signal y _iCan be expressed as several groups of adjacent pulses.By table 1 and table 2 as can be known, has different pattern value a corresponding to different primary identifier p _b(p).For transmission mode I, II, IV, its pattern value a _b(p) comprise 8 data intervals (b=0 123456 7); For the transmission mode formula III, its pattern value a _b(p) comprise 4 data intervals (b=0 12 3).At pattern value a _b(p) in, 1 this data interval of expression has pulse to exist, and 0 expression does not have pulse to exist, and that is to say, by pattern value a _b(p) decide the data of each data interval to distribute.24 groups of data are arranged in each data interval, and each group data comprises 2 data, i.e. the data pulse of carrying is to occur in pairs.If data interval has pulse to exist, then this pulse is carried by a certain group of data in 24 groups of data, and specifically which group data is carried pulse and determined by the c value.

Take pattern II as example, y _iEffectively sub-carrier number is 384, can resolve into 2X8X24, and wherein 384 valid data of 8 expressions are divided into 8 data intervals, and the data in these 8 data intervals distribute by a _b(p) determine a _b(p) be to represent that this data interval had pulse to exist at 1 o'clock, otherwise do not have; 24 expressions have 24 groups of data in each data interval, if data interval has pulse to exist, then this pulse is carried by a certain group of data in these 24 groups of data, and specifically which group data is carried pulse and determined by the c value; The pulse that 2 expressions are carried is to occur in pairs.

Fig. 2 is the schematic diagram of transmission mode II TII signal in the constant situation of sub-identifier c value, as shown in Figure 2, is illustrated in the TII signal of the corresponding 3 kinds of different primary identifier p values of sub-identifier c=1.Wherein, 2 (a) are illustrated in c=1, the TII signal schematic representation during p=0, and can obtain pattern value according to table 1 during p=0 is 00001111, namely is illustrated in no pulse in the 0th to the 3rd the data interval, in the 4th to the 7th data interval pulse is arranged.Being illustrated in during c=1 in the data interval of pulse and carrying pulse by the 2nd and the 3rd (2c and 2c+1 position) these group data, is that the 194th, 195,242,243,290,291,338,339 bit data are carried pulse as shown in 2 (a).For 2 (b) expression c=1, the TII signal schematic representation during p=1, can obtain pattern value according to table 1 during p=1 is 00010111, namely is illustrated in no pulse in the 0th, 1,2,4 the data interval, in the 3rd, 5,6,7 data interval pulse is arranged.Be that the 146th, 147,242,243,290,291,338,339 bit data are carried pulse as shown in 2 (b).In like manner, be that the 146th, 147,194,195,290,291,338,339 bit data are carried pulse as shown in 2 (c).

Fig. 3 is the schematic diagram of transmission mode II TII signal in the constant situation of primary identifier p value, as shown in Figure 3, is illustrated in the TII signal of the corresponding 3 kinds of sub-identifier c of the difference values of primary identifier p=0.Wherein, 3 (a) are illustrated in c=0, the TII signal schematic representation during p=0, and can obtain pattern value according to table 1 during p=0 is 00001111, namely is illustrated in no pulse in the 0th to the 3rd the data interval, in the 4th to the 7th data interval pulse is arranged.Being illustrated in during c=0 in the data interval of pulse and carrying pulse by the 0th and the 1st these group data, is that the 192nd, 193,240,241,288,289,336,337 bit data are carried pulse as shown in 3 (a).For 3 (b) expression c=12, TII signal schematic representation during p=0, being illustrated in during c=12 in the data interval of pulse and carrying pulse by the 24th and the 25th these group data, is that the 216th, 217,264,265,312,313,360,361 bit data are carried pulse as shown in 3 (b).In like manner, be that the 238th, 239,286,287,334,335,382,383 bit data are carried pulse as shown in 3 (c).

This shows, after having determined sub-identifier c value, determine that the data that primary identifier p value only needs to extract the interval neutron flag symbol of 8 data c correspondence position get final product.Can reduce like this data amount check that once extracts, save memory space, improve processing speed.The present invention then adopts above-mentioned characteristic, provides a kind of memory space of saving, the analytic method of the transmitter identification information that reduces the cost and device.

Embodiment one

Fig. 4 is the analytic method flow chart of the transmitter identification information that provides of present embodiment, and as shown in Figure 4, the analytic method of transmitter identification information of the present invention comprises:

Step S101, from digital audio broadcasting (DAB) null symbol that receives, extract the first data Y that contains transmitter identification information TII _i, and to described the first data Y _iCarry out Fourier transform and obtain the second data y _i

DAB flows to transmit the sky symbol of transmitter identification information TII and the synchronizing signal of receiver begins, that is to say, in the original position of the sky symbol that DAB flows, include transmitter identification information TII sequence, thereby can from the sky symbol, extract these a part of data, obtain the first data Y of TII _i

Because the TII signal is expressed as one group or several groups of adjacent pulses in frequency domain, to the first data Y of extracting _iCarry out fast Fourier transform FFT and obtain the second data y _i, resolve in order to carry out TII.

One preferred embodiment in, carry out fast Fourier transform FFT at step S101 and obtain the second data y _iAfterwards, also comprise: detect described the second data y _iIn whether contain transmitter identification information, if so, then continue to carry out described step S102, otherwise process ends, thereby avoid the DAB stream that does not have transmitter identification information is carried out resolving of the present invention, improve system's treatment effeciency.

According to DAB agreement regulation, transmitter identification information is filled in the sky symbol at interval, fills once every an empty symbol.Thereby the TII signal is expressed as one group or several groups of adjacent pulses in frequency domain.

Particularly, utilize through the second data y after the FFT conversion _i, according to inequality:

[max (y _i)-α max (y _I-1)] [max (y _I+1)-α max (y _i)]＜0 (inequality 1)

Wherein, max (y _i) be i the second data y _iIn the amplitude maximum, max (y _I-1) be i-1 the second data y _I-1In the amplitude maximum, max (y _I+1) be i+1 the second data y _I+1In the amplitude maximum, α is predetermined threshold value.

Judge whether above-mentioned inequality 1 is set up, if set up, then determine described the second data y _iIn contain transmitter identification information, otherwise confirm described the second data y _iIn do not contain transmitter identification information.

Step S102, according to the transmission mode of digital audio broadcasting DAB, from described the second data y _iThe data B of the current sub-identifier c correspondence position of middle extraction.

Because the TII signal shows as the pulse of paired appearance in frequency domain, according to the consensus standard of DAB, take 48 valid data as a data interval, in a data interval, there are 24 kinds of possibilities the right appearance position of pulse.

Sub-identifier c is for the position sign of a data interval order of expression, when the value of having determined sub-identifier c, has also just determined the particular location of a pulse to occurring in each data interval, corresponds to 2c and 2c+1 position.That is to say that the sub-identifier c for determining has also just determined the appearance position that its data pulse is right.For example, when c=0, corresponding position is the 0th and 1.

According to agreement, all transmitting stations in definite scope of a Synchronization Network, use identical principal mark to know (p), have identical son sign (c) but the distance that has between two cell sites of different main marks must be far as far as possible, to avoid the mutual interference of transmitting station phase.

The c value of the TII information that therefore receives can not repeat, and the given of c value can be according to the following rules:

if(c≥23)

c＝0

else

c＝c+1

That is to say that the span of sub-identifier c is generally [0,23], from the span of sub-identifier c, choose successively a sub-identifier c as current sub-identifier c.

Particularly, according to the current sub-identifier c that chooses, from described the second data y _iThe data B of the current sub-identifier c correspondence position of middle extraction comprises:

Step S102_1, according to the transmission mode of DAB, with described the second data y _iIt is interval to be divided into n data.

Take 48 valid data as a data interval, with described data y _iIt is interval to be divided into n data.For example, data y in transmission mode II _iEffectively sub-carrier number is 384, then can be divided into 8 data intervals.For transmission mode I and IV, be equivalent to repeat respectively 4 times and 2 times.For the transmission mode formula III, can be divided into 4 data intervals.

Step S102_2, from the span of sub-identifier c, choose successively a sub-identifier c, according to the current sub-identifier c that chooses, from described n data interval, extract 2c and the 2c+1 bit data obtains data B.Namely have:

B={y _{I, 2 (c+24j)}, y _{I, 2 (c+24j)+1}J=0,1 ..., n-1 (formula 7)

For example, when choosing c=0, then correspondence is extracted corresponding the 0th and the 1st bit data from each data interval.For transmission mode II, 8 data intervals are arranged, can obtain 8 groups, 16 data: the 0th and 1, the 48th and 49, the 96th and 97, the 144th and 145, the 192nd and 193, the 240th and 241, the 288th and 289, the 336th and 337 data.

Step S103, obtain described the second data y according to the range value of described data B _iPattern value, utilize described pattern value to determine primary identifier p corresponding to described current sub-identifier c.Specifically comprise:

Step S103_1, described data B is divided into M data block, it is interval to comprise b data in each data block, and wherein, the value of M determines b=n/M according to the transmission mode of DAB.Data block is namely arranged:

B _k={ y _{I, 2*24*b*k+2 (c+24j)}, y _{I, 2*24*b*k+2 (c+24j)+1}J=0,1 ..., b-1, k=0 ..., M-1 (formula 8)

For transmission mode I, effectively sub-carrier number is 1536, take 384 valid data as a data block, can be divided into 4 data blocks, and M=4 has 8 data intervals in each data block.For transmission mode II, effectively sub-carrier number is 384, can be divided into 1 data block, and M=1 has 8 data intervals in each data block.For transmission mode IV, effectively sub-carrier number is 756, can be divided into 2 data blocks, and M=2 has 8 data intervals in each data block.For the transmission mode formula III, effectively sub-carrier number is 192, can be divided into 1 data block, and M=1 has 4 data intervals in each data block.

Certainly, this step is not to be steps necessary, for transmission mode II and transmission mode formula III, 1 data block is only arranged, and then can not carry out the piecemeal of this step yet and process, directly to the interval calculated data range value of n the data of extracting.

Step S103_2, with the conjugate multiplication of 2c+1 bit data and 2c bit data in described n the data interval, and get the range value of product as the data amplitude value in corresponding data space.

The data that odd positions in each data interval is corresponding and the conjugate multiplication of even number position corresponding data obtain the product of n corresponding data, and get the range value of product as the data amplitude value in corresponding data space.Wherein, the range value of product can but be not limited to adopt the mode of asking for the mould value to obtain, be specially:

C _{J, k}=| y ' _{I, 2*24*b*k+2 (c+24j)}* y _{I, 2*24*b*k+2 (c+24j)+1}| j=0,1 ..., b-1, k=0 ..., M-1 (formula 9)

The data amplitude value sum of the data interval of same position in step S103_3, the described M data block is the range value in b the data interval of described data B.

Utilize the piecemeal result of step S103_1, the range value that is in the data interval of data block same position in the different pieces of information piece is sued for peace, will be positioned the range value sum of the data interval of same position, as the range value C in b the data interval of described data B _jParticularly:

$C_j=\left\{\underset{k=0}{\overset{M-1}{\mathrm{\&Sigma;}}}\right|y_{i,2*24*b*k+2\&CenterDot;(c+24\&CenterDot;j)}^{\&prime;}\&CenterDot;y_{i,2*24*b*k+2\&CenterDot;(c+24\&CenterDot;j)+1}\left|\right\}j=\mathrm{0,1},\&CenterDot;\&CenterDot;\&CenterDot;,b-1$

(formula 10)

In transmission course, data pulse can occur inevitably for various reasons and lose, perhaps owing to introduce the situation that the excessive Data Position that appears at no pulse of noise shows as the errors of transmission such as pulse.Then can reduce these because the impact that error of transmission or error problem bring to the result of range value summation, so that the result who detects is more accurate.

In like manner, this step is not to be steps necessary yet, for transmission mode II and transmission mode formula III, 1 data block is only arranged, and then can not carry out the summation of this step yet and process.

It is worth mentioning that step S103_3 adopts step S103_1 and S103_2 to divide other result, to sequencing the present invention of step S103_1 and S103_2 and be not construed as limiting, that is to say that step S103_2 also can carry out before step S103_1.

Step S103_4, the range value in described b data interval is sorted, choose the value of data interval at a front b/2 place for high, the value in remainder data interval is low, obtains the pattern value A of described data.

Under ideal conditions, if current sub-identifier c has corresponding TII signal to exist, then in b data interval, have b/2 higher range value, a that the higher amplitude value is corresponding _b(p) be 1 position in.

Thereby, the range value C in b the data interval that step S103_3 is calculated _j, sorting according to the range value size, the value of choosing the data interval at a front b/2 place is height, the value in remainder data interval is low, obtains the pattern value A of described data.

Take transmission mode II as example, in 8 data intervals, have 4 higher range values, to choose range value and be in front 4 data space, the correspondence position in pattern value is 1, all the other are 0, can obtain 8 pattern value A, such as 11001010 etc.

Step S103_5, the standard pattern value of utilizing described pattern value A and DAB to define are mated, and the primary identifier p that the pattern value that matches is corresponding is defined as primary identifier p corresponding to current sub-identifier c.

With the standard pattern value a of described pattern value A with corresponding transmission mode _b(p) (shown in table 1 or table 2) compares, and determines primary identifier p.For example, be 11001010 for pattern value A, can obtain corresponding primary identifier p=59, thereby obtain the combination of current sub-identifier c and primary identifier p, subsequent treatment is carried out in output.

One preferred embodiment in, after determining primary identifier p corresponding to described current sub-identifier c, also comprise:

Described current sub-identifier c and primary identifier p are carried out confidence level detect, confidence level is carried out array output, execution in step S104 greater than sub-identifier c and the primary identifier p of predetermined threshold value.

Because the primary identifier p value among the step S103 is to obtain according to C ordering coupling, for current sub-identifier c, even there is not (p in the reality, c) value, the output of step S103 also can obtain (p, c) value, therefore, usually need to put to the result of step S103 letter and detect, to improve accuracy.

For current sub-identifier c, judge whether current definite described primary identifier p consistent with the last primary identifier p that determines, if consistent, then will described current sub-identifier c and the confidence level of the primary identifier p of correspondence add one, otherwise described confidence level subtracts one.

Particularly, each sub-identifier c value is had corresponding locking confidence circuit, when (p, c) value corresponding to step S103 output, that opens correspondence puts the letter circuit, and processes as follows:

The current primary identifier p value that obtains with put the p value that the letter circuit prestores and whether equate, equal then counter adds 1, otherwise subtract 1; When counter equals 0, then the p value of input is stored; When counter during greater than threshold value, output p value also provides effective indication, and (p, c) value of output correspondence is carried out subsequent treatment.Requirement when the threshold value of putting the letter circuit can be used according to reality arranges, and threshold value is higher, and the reliability of detection is higher, usually can be set to 3.

Detect by the above-mentioned letter of putting, so that method of the present invention has very high reliability, corresponding sub-identifier c ₀Value supposes there is not corresponding TII information that step S103 exports a p ₀, because corresponding c ₀Range value C can think noise, corresponding c next time then ₀The p that parses is p ₀Probability will be very little.

Step S104, determine described transmitter identification information according to described primary identifier p and sub-identifier c.

In the fast information channel in dab receiver (being FIC) of data flow, send all available primary identifier p of unifrequency network and whole tabulations of sub-identifier c.Utilize the resulting primary identifier p of step S103 and sub-identifier c, perhaps through putting primary identifier p and the sub-identifier c of letter detection, determine the information of transmitter.

More than be the detailed description that method provided by the present invention is carried out, the below is described in detail the resolver of transmitter identification information provided by the invention.

Embodiment two

Fig. 5 is the resolver schematic diagram of the transmitter identification information that provides of present embodiment, as shown in Figure 5, the resolver of transmitter identification information of the present invention comprises: the first extraction unit 10, the first detecting unit 20, the second extraction unit 30, resolution unit 40, put letter detecting unit 50 and determining unit 60.

The first extraction unit 10 is used for extracting the first data Y that contains transmitter identification information TI I from the sky symbol NULL of the digital audio broadcasting stream that receives _i, and to described the first data Y _iCarry out Fourier transform and obtain the second data y _i

DAB flows to transmit the sky symbol of transmitter identification information TII and the synchronizing signal of receiver begins, that is to say, in the original position of the sky symbol that DAB flows, include transmitter identification information TII sequence, thereby utilize the first extraction unit 10 from the sky symbol, to extract these a part of data, obtain the first data Y of TII _i

Because the TI I signal is expressed as one group or several groups of adjacent pulses, the first data Y that 10 pairs of the first extraction units extract in frequency domain _iCarry out fast Fourier transform FFT and obtain the second data y _i, resolve in order to carry out TII.

Described the second data y that the first detecting unit 20 obtains for detection of the first extraction unit 10 _iIn whether contain transmitter identification information.

Carry out fast Fourier transform FFT at the first extraction unit 10 and obtain the second data y _iAfterwards, utilize the first detecting unit 20 to detect described the second data y _iIn whether contain transmitter identification information, if so, then with the second data y _i Offer resolution unit 40, otherwise return the first extraction unit 10 or end, thereby avoid the DAB stream that does not have transmitter identification information is carried out resolving of the present invention, improve system's treatment effeciency.

According to DAB agreement regulation, transmitter identification information is filled in the sky symbol at interval, fills once every an empty symbol.Thereby the TII signal is expressed as one group or several groups of adjacent pulses in frequency domain.

Particularly, the first detecting unit 20 utilizes through the second data y after the FFT conversion _i, judge whether inequality 1 is set up, if set up, then determine described the second data y _iIn contain transmitter identification information, otherwise confirm described the second data y _iIn do not contain transmitter identification information.

Certainly, the first detecting unit 20 is not the necessary module of the present invention, when less demanding to system's processing speed or when determining to contain the TII signal, the first detecting unit 20 can be set yet.

The transmission mode that the second extraction unit 30 is used for according to digital audio broadcasting DAB is from described the second data y _iThe data B of the current sub-identifier c correspondence position of middle extraction.

Because the TII signal shows as the pulse of paired appearance in frequency domain, according to the consensus standard of DAB, take 48 valid data as a data interval, in a data interval, there are 24 kinds of possibilities the right appearance position of pulse.

Sub-identifier c is for the position sign of a data interval order of expression, when the value of having determined sub-identifier c, has also just determined the particular location of a pulse to occurring in each data interval, corresponds to 2c and 2c+1 position.That is to say that the sub-identifier c for determining has also just determined the appearance position that its data pulse is right.For example, when c=0, corresponding position is the 0th and 1.

According to agreement, all transmitting stations in definite scope of a Synchronization Network, use identical principal mark to know (p), have identical son sign (c) but the distance that has between two cell sites of different main marks must be far as far as possible, to avoid the mutual interference of transmitting station phase.

The c value of the TII information that therefore receives can not repeat, and the given of c value can be according to the following rules:

if(c≥23)

c＝0

else

c＝c+1

That is to say that the span of sub-identifier c is generally [0,23], from the span of sub-identifier c, choose successively a sub-identifier c as current sub-identifier c.

Particularly, the second extraction unit 30 comprises that subregion subelement 301 and first extracts subelement 302.

The transmission mode that subregion subelement 301 is used for according to DAB is with described the second data y _iIt is interval to be divided into n data.

Take 48 valid data as a data interval, with described data y _iIt is interval to be divided into n data.For example, data y in transmission mode II _iEffectively sub-carrier number is 384, then can be divided into 8 data intervals.For transmission mode I and IV, be equivalent to repeat respectively 4 times and 2 times.For the transmission mode formula III, can be divided into 4 data intervals.

First extracts subelement 302 is used for choosing successively a sub-identifier c from the span of sub-identifier c, and according to the current sub-identifier c that chooses, extraction 2c and 2c+1 bit data obtain data B from described n data interval, and data B as shown in Equation 7.

For example, when choosing c=0, then correspondence is extracted corresponding the 0th and the 1st bit data from each data interval.For transmission mode II, 8 data intervals are arranged, can obtain 8 groups, 16 data: the 0th and 1, the 48th and 49, the 96th and 97, the 144th and 145, the 192nd and 193, the 240th and 241, the 288th and 289, the 336th and 337 data.

Resolution unit 40 is used for obtaining described the second data y according to the range value of described data B _iPattern value, utilize described pattern value to determine primary identifier p corresponding to described current sub-identifier c.

Resolution unit 40 specifically comprises: piecemeal subelement 401, the first computation subunit 402, the second computation subunit 403, ordering subelement 404 and coupling subelement 405.

Piecemeal subelement 401 is used for described data B is divided into M data block, and it is interval to comprise b data in each data block, and wherein, the value of M determines b=n/M according to the transmission mode of DAB.

The expression formula of the M that specifically an obtains data block as shown in Equation 8.

For transmission mode I, effectively sub-carrier number is 1536, take 384 valid data as a data block, can be divided into 4 data blocks, and M=4 has 8 data intervals in each data block.For transmission mode II, effectively sub-carrier number is 384, can be divided into 1 data block, and M=1 has 8 data intervals in each data block.For transmission mode IV, effectively sub-carrier number is 756, can be divided into 2 data blocks, and M=2 has 8 data intervals in each data block.For the transmission mode formula III, effectively sub-carrier number is 192, can be divided into 1 data block, and M=1 has 4 data intervals in each data block.

The conjugate multiplication that the first computation subunit 402 is used for described n data interval 2c+1 bit data and 2c bit data, and get the range value of product as the data amplitude value in corresponding data space.

Particularly, the data that the first computation subunit 402 is corresponding with odd positions in each data interval and the conjugate multiplication of even number position corresponding data obtain the product of n corresponding data, and get the range value of product as the data amplitude value in corresponding data space.Wherein, the range value of product can but be not limited to adopt the mode of asking for the mould value to obtain, specifically as shown in Equation 9.

The second computation subunit 403 is used for the data amplitude value sum of the data interval of described M data block same position, is the range value in b the data interval of described data B.

Utilize the piecemeal result of piecemeal subelement 401, the range value that is in the data interval of data block same position in the different pieces of information piece is sued for peace, the range value sum of the data interval of same position will be positioned, as the range value C in b the data interval of described data B _j, specifically as shown in Equation 10.

In transmission course, data pulse can occur inevitably for various reasons and lose, perhaps owing to introduce the excessive situation that shows as the errors of transmission such as pulse at the Data Position of no pulse of noise.Then can reduce these because the impact that error of transmission or error problem bring to the result of range value summation, so that the result who detects is more accurate.

It is worth mentioning that, the second computation subunit 403 adopts piecemeal subelement 401 and 402 minutes other results of the first computation subunit, therefore, to sequencing the present invention of piecemeal subelement 401 and the first computation subunit 402 and be not construed as limiting, that is to say that the first computation subunit 402 also can be arranged on before the piecemeal subelement 401.

Certainly, piecemeal subelement 401 and the second computation subunit 403 are for the transmission mode of many data blocks, it is not the module for necessity of the present invention, for transmission mode II and transmission mode formula III, 1 data block is only arranged, piecemeal subelement 401 and the second computation subunit 403 then also can be set.

Ordering subelement 404 is used for the range value in described b data interval is sorted, and the value of choosing the data interval at a front b/2 place is height, and the value in remainder data interval is low, obtains the pattern value A of described data.

Under ideal conditions, if current sub-identifier c has corresponding TII signal to exist, then in b data interval, have b/2 higher range value, a that the higher amplitude value is corresponding _b(p) be 1 position in.

Thereby, the range value C in b the data interval that 404 pairs of the second computation subunit 403 of ordering subelement calculate _j, sorting according to the range value size, the value of choosing the data interval at a front b/2 place is height, the value in remainder data interval is low, obtains the pattern value A of described data.

Take transmission mode II as example, in 8 data intervals, have 4 higher range values, to choose range value and be in front 4 data space, the correspondence position in pattern value is 1, all the other are 0, can obtain 8 pattern value A, such as 11001010 etc.

Coupling subelement 405 is used for utilizing the standard pattern value of described pattern value A and DAB definition to mate, and the primary identifier p that the pattern value that matches is corresponding is defined as primary identifier p corresponding to current sub-identifier c.

With the standard pattern value a of described pattern value A with corresponding transmission mode _b(p) (shown in table 1 or table 2) compares, and determines primary identifier p.For example, be 11001010 for pattern value A, can obtain corresponding primary identifier p=59, thereby obtain the combination of current sub-identifier c and primary identifier p, subsequent treatment is carried out in output.

Put letter detecting unit 50 and be used for that resolution unit 40 determined current sub-identifier c and primary identifier p are carried out confidence level and detect, confidence level is carried out array output greater than sub-identifier c and the primary identifier p of predetermined threshold value, offer determining unit 60.

Because the primary identifier p value in the resolution unit 40 is to obtain according to range value C ordering coupling, for current sub-identifier c, even there is not (p in the reality, c) value, the output of resolution unit 40 also can obtain (p, c) value, therefore, usually need to put to the result of resolution unit 40 letter and detect, to improve accuracy.

Putting letter detecting unit 50 specifically is used for for current sub-identifier c, judge whether current definite described primary identifier p is consistent with the last primary identifier p that determines, if consistent, then will described current sub-identifier c and the confidence level of the primary identifier p of correspondence add one, otherwise described confidence level subtracts one.

Particularly, each sub-identifier c value is had corresponding locking confidence circuit, when (p, c) value corresponding to resolution unit 40 outputs, that opens correspondence puts the letter circuit, and is configured as follows:

The current primary identifier p value that obtains with put the p value that the letter circuit prestores and whether equate, equal then counter adds 1, otherwise subtract 1; When counter equals 0, then the p value of input is stored; When counter during greater than threshold value, output p value also provides effective indication, and (p, c) value of output correspondence is carried out subsequent treatment.Requirement when the threshold value of putting the letter circuit can be used according to reality arranges, and threshold value is higher, and the reliability of detection is higher, usually can be set to 3.

Put the letter detection by the above-mentioned letter detecting unit 50 of putting, so that device of the present invention has very high reliability, corresponding sub-identifier c ₀Value is supposed not have corresponding TII information, p of resolution unit 40 outputs ₀, because corresponding c ₀Range value C can think noise, corresponding c next time then ₀The p that parses is p ₀Probability will be very little.

Determining unit 60 is used for determining described transmitter identification information according to described primary identifier p and sub-identifier c.

In the fast information channel in dab receiver (being FIC) of data flow, send all available primary identifier p of unifrequency network and whole tabulations of sub-identifier c.Utilize resolution unit 40 resulting primary identifier p and sub-identifier c, perhaps through putting primary identifier p and the sub-identifier c of 50 detections of letter detecting unit, determine the information of transmitter.

The analytic method of transmitter identification information provided by the invention and device, by giving successively stator identifier c value, data from the corresponding sub-identifier c of the extracting data obtained position, range value according to the data of extracting is determined pattern value, thereby determine primary identifier p value, only need extract each time the data of limited number, only need less storage resources, can save memory space, improve processing speed, and put letter by the number of times of verifying corresponding sub-identifier c and primary identifier p combination appearance and detect, improve the accuracy of analysis result.

The professional should further recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software clearly is described, composition and the step of each example described in general manner according to function in the above description.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.The professional and technical personnel can specifically should be used for realizing described function with distinct methods to each, but this realization should not thought and exceeds scope of the present invention.

The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can use the software module of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.

Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is the specific embodiment of the present invention; the protection range that is not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (18)

1. the analytic method of a transmitter identification information is characterized in that, described method comprises:

From the sky symbol that the digital audio broadcasting that receives is flowed, extract the first data Y that contains transmitter identification information _i

To described the first data Y _iCarry out Fourier transform and obtain the second data y _i

According to the transmission mode of digital audio broadcasting DAB, from described the second data y _iThe data B of the current sub-identifier c correspondence position of middle extraction;

Range value according to described data B obtains described the second data y _iPattern value, utilize described pattern value to determine primary identifier p corresponding to described current sub-identifier c;

Determine described transmitter identification information according to described primary identifier p and sub-identifier c.

2. the analytic method of transmitter identification information according to claim 1 is characterized in that, described method obtains the second data y at the described fast Fourier transform FFT that carries out _iAfterwards, also comprise:

Detect described the second data y _iIn whether contain transmitter identification information, if so, then continue to carry out described transmission mode according to digital audio broadcasting DAB, from described the second data y _iThe data B of the current sub-identifier c correspondence position of middle extraction.

3. the analytic method of transmitter identification information according to claim 2 is characterized in that, described the second data y of described detection _iIn whether contain transmitter identification information, be specially:

Judge inequality [max (y _i)-α max (y _I-1)] [max (y _I-1)-α max (y _i)]＜0 whether set up, wherein, max (y _i) be i the second data y _iIn the amplitude maximum, max (y _I-1) be i-1 the second data y _I-1In the amplitude maximum, max (y _I+1) be i+1 the second data y _I+1In the amplitude maximum, α is predetermined threshold value, if set up, then determines described the second data y _iIn contain transmitter identification information, otherwise confirm described the second data y _iIn do not contain transmitter identification information.

4. the analytic method of transmitter identification information according to claim 1 is characterized in that, described current sub-identifier c be from sub-identifier c span (c=0,1 ..., 23) in a sub-identifier c choosing successively.

5. according to claim 1 or the analytic method of 4 described transmitter identification information, it is characterized in that described transmission mode according to digital audio broadcasting DAB is from described the second data y _iThe data B of the current sub-identifier c correspondence position of middle extraction specifically comprises:

According to the transmission mode of DAB, with described the second data y _iIt is interval to be divided into n data;

From the span of sub-identifier c, choose successively a sub-identifier c;

According to the current sub-identifier c that chooses, extraction 2c and 2c+1 bit data obtain data B from described n data interval.

6. the analytic method of transmitter identification information according to claim 5 is characterized in that, described range value according to described data B obtains described the second data y _iPattern value, utilize described pattern value to determine primary identifier p corresponding to described current sub-identifier c, specifically comprise:

Described data B is divided into M data block, and it is interval to comprise b data in each data block, and wherein, the value of M determines b=n/M according to the transmission mode of DAB;

With the conjugate multiplication of 2c+1 bit data and 2c bit data in described n the data interval, and get the range value of product as the data amplitude value in corresponding data space;

The data amplitude value sum of the data interval of same position in the described M data block is the range value in b the data interval of described data B;

Range value to described b data interval sorts, and the value of choosing the data interval at a front b/2 place is height, and the value in remainder data interval is low, obtains the pattern value A of described data;

Utilize the standard pattern value of described pattern value A and DAB definition to mate, with the corresponding primary identifier p of the pattern value that matches, be defined as primary identifier p corresponding to described current sub-identifier c.

7. the analytic method of transmitter identification information according to claim 5 is characterized in that, described range value according to described data B obtains described the second data y _iPattern value, utilize described pattern value to determine primary identifier p corresponding to described current sub-identifier c, specifically comprise:

With the conjugate multiplication of 2c+1 bit data and 2c bit data in described n the data interval, and get the range value of product as the data amplitude value in corresponding data space;

Range value to described n data interval sorts, and the value of choosing the data interval at a front n/2 place is height, and the value in remainder data interval is low, obtains the pattern value A of described data;

Utilize the standard pattern value of described pattern value A and DAB definition to mate, with the corresponding primary identifier p of the pattern value that matches, be defined as primary identifier p corresponding to described current sub-identifier c.

8. the analytic method of transmitter identification information according to claim 1 is characterized in that, after primary identifier p corresponding to described definite described current sub-identifier c, also comprises:

Described current sub-identifier c and primary identifier p are carried out the confidence level detection, confidence level is carried out array output greater than sub-identifier c and the primary identifier p of predetermined threshold value, carry out and describedly determine described transmitter identification information according to described primary identifier p and sub-identifier c.

9. the analytic method of transmitter identification information according to claim 1 is characterized in that, describedly current sub-identifier c and primary identifier p are carried out confidence level detects, and is specially:

For current sub-identifier c, judge whether current definite described primary identifier p consistent with the last primary identifier p that determines, if consistent, then will described current sub-identifier c and the confidence level of the primary identifier p of correspondence add one, otherwise described confidence level subtracts one.

10. the resolver of a transmitter identification information is characterized in that, described device comprises:

The first extraction unit is used for extracting the first data Y that contains transmitter identification information from the sky symbol that the digital audio broadcasting that receives is flowed _i, and to described the first data Y _iCarry out Fourier transform and obtain the second data y _i

The second extraction unit is used for the transmission mode according to digital audio broadcasting DAB, from described the second data y _iThe data B of the current sub-identifier c correspondence position of middle extraction;

Resolution unit, the range value that is used for the described data B that extracts according to described the second extraction unit obtains described the second data y _iPattern value, utilize described pattern value to determine primary identifier p corresponding to described current sub-identifier c;

Determining unit is used for determining described transmitter identification information according to described primary identifier p and sub-identifier c.

11. the resolver of transmitter identification information according to claim 10 is characterized in that, described device also comprises:

The first detecting unit, described the second data y that obtains for detection of described the first extraction unit _iIn whether contain transmitter identification information, if so, then with described the second data y _iOffer described resolution unit.

12. the resolver of transmitter identification information according to claim 11 is characterized in that, described the first detecting unit specifically is used for:

Judge inequality [max (y _i)-α max (y _I-1)] [max (y _I-1)-α max (y _i)]＜0 whether set up, wherein, max (y _i) be i the second data y _iIn the amplitude maximum, max (y _I-1) be i-1 the second data y _I-1In the amplitude maximum, max (y _I+1) be i+1 the second data y _I+1In the amplitude maximum, α is predetermined threshold value, if set up, then determines described the second data y _iIn contain transmitter identification information, with described the second data y _iOffer described resolution unit, otherwise confirm described the second data y _iIn do not contain transmitter identification information.

13. the resolver of transmitter identification information according to claim 10, it is characterized in that the current sub-identifier c of described the second extraction unit is span (c=0,1 from sub-identifier c, ..., 23) in a sub-identifier c choosing successively.

14. according to claim 10 or the resolver of 13 described transmitter identification information, it is characterized in that described the second extraction unit specifically comprises:

The subregion subelement is used for the transmission mode according to DAB, with described the second data y _iIt is interval to be divided into n data;

First extracts subelement, is used for choosing successively a sub-identifier c from the span of sub-identifier c, and according to the current sub-identifier c that chooses, extraction 2c and 2c+1 bit data obtain data B from described n data interval.

15. the resolver of transmitter identification information according to claim 14 is characterized in that, described resolution unit specifically comprises:

The piecemeal subelement is used for described data B is divided into M data block, and it is interval to comprise b data in each data block, and wherein, the value of M determines b=n/M according to the transmission mode of DAB;

The first computation subunit is used for the conjugate multiplication with described n data interval 2c+1 bit data and 2c bit data, and gets the range value of product as the data amplitude value in corresponding data space;

The second computation subunit is used for calculating the data amplitude value sum of the data interval of described M data block same position, as the range value in b the data interval of described data B;

The ordering subelement is used for the range value in described b data interval is sorted, and the value of choosing the data interval at a front b/2 place is height, and the value in remainder data interval is low, obtains the pattern value A of described data;

The coupling subelement is used for utilizing the standard pattern value of described pattern value A and DAB definition to mate, and with the corresponding primary identifier p of the pattern value that matches, is defined as primary identifier p corresponding to described current sub-identifier c.

16. the resolver of transmitter identification information according to claim 14 is characterized in that, described resolution unit specifically comprises:

The first computation subunit is used for the conjugate multiplication with described n data interval 2c+1 bit data and 2c bit data, and gets the range value of product as the data amplitude value in corresponding data space;

The ordering subelement is used for the range value in described n data interval is sorted, and the value of choosing the data interval at a front n/2 place is height, and the value in remainder data interval is low, obtains the pattern value A of described data;

The coupling subelement is used for utilizing the standard pattern value of described pattern value A and DAB definition to mate, and with the corresponding primary identifier p of the pattern value that matches, is defined as primary identifier p corresponding to described current sub-identifier c.

17. the resolver of transmitter identification information according to claim 10 is characterized in that, described device also comprises:

Put the letter detecting unit, be used for that the determined current sub-identifier c of described resolution unit and primary identifier p are carried out confidence level and detect, and confidence level is carried out array output greater than sub-identifier c and the primary identifier p of predetermined threshold value, offer described determining unit.

18. the resolver of transmitter identification information according to claim 17 is characterized in that, the described letter detecting unit of putting specifically is used for:

For current sub-identifier c, judge whether current definite described primary identifier p consistent with the last primary identifier p that determines, if consistent, then will described current sub-identifier c and the confidence level of the primary identifier p of correspondence add one, otherwise described confidence level subtracts one.

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