CN101674588B - Dummy burst detection method and device - Google Patents

Abstract

The embodiment of the invention discloses a dummy burst detection method and a dummy burst detection device. The method comprises the following steps: obtaining initial decision information of previous three time slots of a data block; performing at least one decision again on a corresponding slot of the dummy burst DB to obtain decision result information if the initial decision information of the previous three time slots contains the dummy burst DB; and determining a modulation mode of the data block according to the decision result information. The device comprises an acquisition module for acquiring the initial decision information of the previous three time slots of the data block; a decision acquisition module for performing the at least one decision again on the corresponding slot of the dummy burst DB to obtain the decision result information if the initial decision information of the previous three time slots contains the dummy burst DB; and a determination module for determining the modulation mode of the data block according to the decision result information. The dummy burst detection method and the device help solve the problem of detecting the DB modulated by GMSK in case of simultaneous presence of the DB and NB.

Description

Dummy burst detection method and device

Technical field

The embodiment of the invention relates to the communications field, relates in particular to a kind of dummy burst detection method and device.

Background technology

Global system for mobile communications (Global System for Mobile communication; Hereinafter to be referred as: GSM), (User Equipment is hereinafter to be referred as UE) transmission rate in order to improve subscriber equipment; European telecommunications standards institute has been released EDGE (Enhanced Data Rate for GSMEvolution; Enhanced data rates for gsm evolution) standard, wherein GSM adopts GMSK (Gaussian Minimum-Shift Keying is hereinafter to be referred as GMSK) modulation system; EDGE then adopts the octal system phase shift keying, and (Octal Phase-shift Keying is hereinafter to be referred as 8PSK) modulation system.Various network can select different modulation modes to carry out transfer of data according to channel quality and business demand.Correspondingly, at receiving terminal, then need adopt different demodulation methods for the data of different modulation modes.

In order the data block that receives to be used correct demodulation method at receiving terminal, must introduce modulation blind Detecting mechanism, promptly at first need judge the modulation system of the data block that receives, select the demodulation method corresponding that data block is carried out demodulation then with this modulation system.For GPRS (General PacketRadio Service, hereinafter to be referred as: GPRS), be to adopt normal burst (Normal Burst is hereinafter to be referred as NB) carry data information on transmission and control channel.Existing modulation blind Detecting mechanism can utilize the symbol of corresponding training sequence in the data block of reception and the local NB training sequence that produces to carry out binary phase shift keying (Binary Phase-shift Keying; Hereinafter to be referred as: BPSK) carry out related operation after the mapping, judge the modulation system of the data block that receives through comparing the energy size.When network strictly only sent NB, this machine-processed probability of miscarriage of justice was very low.But under some network, when not having transmission of data blocks, network can to UE send dummy burst (Dummy Burst, hereinafter to be referred as: DB), connect to keep network.In existing protocol, DB adopts the GMSK modulation.

The inventor is in realizing process of the present invention; Find that there is following problem at least in prior art: at receiving terminal; The DB of GMSK modulation is mistaken for the NB of 8PSK modulation easily, thereby makes signal to noise ratio significantly descend, and then causes network to connect interruption; Therefore, the DB that how to detect GMSK modulation becomes problem demanding prompt solution.

Summary of the invention

The embodiment of the invention provides a kind of dummy burst detection method and device, to solve the problem of the DB that how to detect the GMSK modulation in the prior art.

The embodiment of the invention provides a kind of dummy burst detection method, comprising:

Obtain the initial discriminative information of first three time slot of data block;

If have dummy burst DB in the initial discriminative information of said first three time slot, then, obtain court verdict information at least once adjudicating again with said DB time slot corresponding;

Confirm the modulation system of said data block according to said court verdict information.

The embodiment of the invention provides a kind of dummy burst checkout gear, comprising:

Acquisition module is used to obtain the initial discriminative information of first three time slot of data block;

The judgement acquisition module is used for when there is dummy burst DB in the initial discriminative information of said first three time slot, at least once adjudicating with said DB time slot corresponding, obtains court verdict information again;

Determination module is used for confirming according to said court verdict information the modulation system of said data block.

The embodiment of the invention; On the basis of existing modulation blind Detecting scheme; Increased the DB blind Detecting, on the basis of the initial discriminative information that obtains first three time slot of data block, if at least one initial discriminative information is the DB of GMSK modulation; Then on the basis of initial judgement at least once adjudicating again for the DB time slot corresponding that GMSK modulates with judgement, and confirm the modulation system of this data block according to final court verdict information.Present embodiment provides the technical scheme of the DB that detects the GMSK modulation, and when having solved the DB that how to detect the GMSK modulation, the NB that can effectively reduce the 8PSK modulation judges the probability for the DB of GMSK modulation by accident.

Description of drawings

In order to be illustrated more clearly in the technical scheme of the embodiment of the invention; To do to introduce simply to the accompanying drawing of required use among the embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the flow chart of an embodiment of DB detection method of the present invention;

Fig. 2 is the flow chart of another embodiment of DB detection method of the present invention;

The theory diagram of Fig. 3 for initially adjudicating among the DB detection method embodiment shown in Figure 2;

Fig. 4 is the structural representation of an embodiment of DB checkout gear of the present invention;

Fig. 5 is the structural representation of another embodiment of DB checkout gear of the present invention.

Embodiment

To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.

Fig. 1 is the flow chart of an embodiment of DB detection method of the present invention, and as shown in Figure 1, the method for present embodiment can comprise:

Step 101, obtain the initial discriminative information of first three time slot of data block;

A data block can comprise four time slots (Burst), all can carry out a blind Detecting judgement for each Burst, thereby can obtain the initial discriminative information of four Burst of data block.In order to improve the real-time of modulation blind Detecting, reduce computation complexity, present embodiment is only adjudicated the modulation system of first three Burst of a data block, obtains the initial discriminative information of first three Burst.

In another embodiment of DB detection method of the present invention, step 101 can be specially:

In a time slot, receive the first via signal and the second road signal; To carrying out relevant treatment with the training sequence that passes through the NB after BPSK shines upon respectively through the first via signal after the GMSK derotation and the second road signal; Obtain first group of correlation energy value; To carrying out relevant treatment with the training sequence that passes through the NB after BPSK shines upon respectively through the first via signal after the 8PSK derotation and the second road signal; Obtain second group of correlation energy value; To carrying out relevant treatment with the training sequence that passes through the DB after BPSK shines upon respectively, obtain the 3rd group of correlation energy value through the first via signal after the GMSK derotation and the second road signal; Confirm the maximum in first group of correlation energy value, second group of correlation energy value and the 3rd group of correlation energy value respectively, and in three maximums will confirming the modulation system of a maximum correspondence as the initial discriminative information of this time slot; Repeat above-mentioned steps, obtain the initial discriminative information of said first three time slot of data block.

With a Burst for instance, the initial judging process of its blind Detecting can for, receive the first via signal in the Burst; Be the I road signal and the second road signal; Be Q road signal, wherein I road signal be this Burst solid part signal, Q road signal is the imaginary signals of this Burst.The first via signal and the second road signal are carried out the GMSK derotation respectively; And the first via signal after the derotation and the second road signal carried out amplitude limit; Then the first via signal behind the amplitude limit and the second road signal are sent into the tap coefficient computing module; With the data of the corresponding training sequence of current Burst position with shine upon through BPSK after local NB training sequence carry out relevantly, obtain first group of correlation energy value; The first via signal and the second road signal are carried out the 8PSK derotation respectively; And the first via signal after the derotation and the second road signal carried out amplitude limit; Then the first via signal behind the amplitude limit and the second road signal are sent into another tap coefficient computing module; With the data of the corresponding training sequence of current Burst position with shine upon through BPSK after local NB training sequence carry out relevantly, obtain second group of correlation energy value; The first via signal and the second road signal are carried out the GMSK derotation respectively; And the first via signal after the derotation and the second road signal carried out amplitude limit; Then the first via signal behind the amplitude limit and the second road signal are sent into another tap coefficient computing module; With the data of the corresponding training sequence of current Burst position with shine upon through BPSK after local DB training sequence carry out relevantly, obtain the 3rd group of correlation energy value.The function class of this tap coefficient computing module is similar to channel estimation module.

First group of aforementioned calculation all can adopt with the process of second group of correlation energy value: with the data of the corresponding training sequence of the first via signal behind amplitude limit position with shine upon through BPSK after local NB training sequence carry out relevant; Obtain the correlation energy value of one group of first via signal; Carry out relevant with the local NB training sequence that passes through after BPSK shines upon the data of the corresponding training sequence of the second road signal behind amplitude limit position; Obtain the correlation energy value of one group of the second road signal; With the corresponding addition of these two groups of correlation energy values, can obtain first group of correlation energy value and second group of correlation energy value respectively.The process of calculating the 3rd group of correlation energy value can adopt: carry out relevant with the local DB training sequence that passes through after BPSK shines upon the data of the corresponding training sequence of the first via signal behind amplitude limit position; Obtain the correlation energy value of one group of first via signal; Carry out relevant with the local DB training sequence that passes through after BPSK shines upon the data of the corresponding training sequence of the second road signal behind amplitude limit position; Obtain the correlation energy value of one group of the second road signal; With the corresponding addition of these two groups of correlation energy values, can obtain the 3rd group of correlation energy value.

Particularly; With the process of obtaining first group of correlation energy value for instance; At first can read in 28 complex valued signals (comprising I road and Q road signal, also is the first via signal and the second road signal) and 26 local NB training sequences that generate through the BPSK mapping after the derotation; Use the signal after 16 signals and 28 derotation of reading in the middle of 26 NB training sequences to carry out relevant treatment then, promptly to use length be 16 window slides in length is 28 data, slides altogether 13 times, can obtain 13 correlations; Using length is that 5 window slides in 13 correlations; Every slip once; Correlation real part in the window square is added the correlation energy value of square the adding up again of its corresponding correlation imaginary part (adding up for totally 5 times) as this time slip, thereby can obtain 9 correlation energy values, be i.e. first group of correlation energy value.Second group of correlation energy value and the 3rd group of correlation energy value repeat no more by that analogy.

Obtain the peak value of three groups of correlation energy values respectively, and compare the size of three peak values, and the modulation system that largest peaks is corresponding, as the modulation system of this Burst.For example, if the peak value of the 3rd group of correlation energy value is maximum,, thereby obtain the initial discriminative information of this Burst then with the DB of GMSK modulation modulation system as this Burst.

The rest may be inferred, can obtain the initial discriminative information of first three Burst of data block.

Step 102, if the initial discriminative information of said first three time slot in have dummy burst DB, then, obtain court verdict information at least once adjudicating again with said DB time slot corresponding;

Simulation result shows; Directly adopt the initial discriminative information of first three Burst to carry out the DB blind Detecting, for example, if the modulation system of preceding two Burst is identical; Then with its modulation system as current block; If the modulation system of preceding two Burst is different, then with the modulation system of the 3rd the Burst modulation system as this data block, then the misjudged probability of NB of 8PSK modulation significantly increases; The probability of DB that wherein is mistaken for GMSK modulation is the highest, therefore causes the blind Detecting performance of the NB of 8PSK modulation that bigger decline is arranged.Therefore; In order to eliminate since the blind Detecting decreased performance of the NB of 8PSK modulation to the influence of subsequent demodulation, decoding performance; Present embodiment can be that the Burst of the DB of GMSK modulation at least once adjudicates again to initial judgement; Thereby further confirm the DB whether this Burst modulates for GMSK really, thereby can obtain court verdict information according to this perhaps more times judgement.

In another embodiment of DB detection method of the present invention, to be the example, obtain court verdict information to once adjudicating again with the DB time slot corresponding, can comprise:

DB training sequence to after shining upon with process BPSK through the signal after the GMSK derotation carries out relevant treatment, obtains first group of energy value, and calculates the second group of energy value that obtains through the signal after the GMSK derotation; Judge whether the maximum of first group of energy value and the peaked ratio of second group of energy value surpass predetermined threshold value, and when surpassing predetermined threshold value, the modulation system of obtaining this time slot is the court verdict information of the DB of GMSK modulation.

With concerning carrying out again adjudicating more than twice or twice with said DB time slot corresponding, obtain court verdict information, can comprise:

Reselect the above judgement of twice or twice required through the length of the signal after the GMSK derotation and through the length of the DB training sequence after the BPSK mapping; Obtain first group of energy value and second group of energy value according to reselecting recomputating of obtaining, and obtain court verdict information according to recomputating first group of energy value and second group of energy value of obtaining through the signal after the GMSK derotation and through the DB training sequence after the BPSK mapping.

In actual implementation procedure, can select to adjudicate number of times as required, the realization principle of each judgement is identical, repeats no more.

Step 103, confirm the modulation system of said data block according to said court verdict information.

According to the initial discriminative information of first three Burst of data block, present embodiment can be divided into two kinds of situation:

1, the initial discriminative information of first three Burst of current data block does not all have the DB of GMSK modulation.

In this case, if the modulation system of preceding two Burst is identical, then with the modulation system of first time slot modulation system as current data block; Otherwise, with the modulation system of the 3rd time slot modulation system as current data block.

2, to have the initial discriminative information of a Burst at least be the DB of GMSK modulation to current data block.

In this case, present embodiment can at least once be adjudicated again, and confirms the modulation system of this data block according to the court verdict information of at least once judgement.

Therefore, in another embodiment of DB detection method of the present invention, step 103 is described to be confirmed to comprise the modulation system of said data block according to said court verdict information:

If in the initial discriminative information of said first three time slot with the DB time slot corresponding in, the court verdict information that a time slot is arranged is the DB of GMSK modulation, then the modulation system of said data block is the DB that GMSK modulates;

If the court verdict information with the DB time slot corresponding in the initial discriminative information of said first three time slot all is not the DB of GMSK modulation, then adjudicate the modulation system of said data block again.

Present embodiment is on the basis of existing modulation blind Detecting scheme; Increased the DB blind Detecting; On the basis of the initial discriminative information that obtains first three time slot of data block; If at least one initial discriminative information is the DB of GMSK modulation, then on the basis of initial judgement at least once adjudicating again for the DB time slot corresponding that GMSK modulates with judgement, and confirm the modulation system of this data block according to final court verdict information.Present embodiment provides the technical scheme of the DB that detects the GMSK modulation, and when having solved the DB that how to detect the GMSK modulation, the NB that can effectively reduce the 8PSK modulation judges the probability for the DB of GMSK modulation by accident.

Be elaborated with the technical scheme of an instantiation below to DB detection method of the present invention.

Fig. 2 is the flow chart of another embodiment of DB detection method of the present invention, and as shown in Figure 2, the method for present embodiment can comprise:

Step 201, obtain the initial discriminative information of first three time slot of data block;

The theory diagram of Fig. 3 for initially adjudicating among the DB detection method embodiment shown in Figure 2; As shown in Figure 3; With a Burst for instance, the initial judging process of its blind Detecting can for, receive I road signal and Q road signal in the Burst; Wherein I road signal is the solid part signal of this Burst, and Q road signal is the imaginary signal component of this Burst.I road signal and Q road signal are carried out the GMSK derotation respectively; And I road signal after the derotation and Q road signal carried out amplitude limit; Then I road signal behind the amplitude limit and Q road signal are sent into the first tap coefficient computing module; With the data of the corresponding training sequence of current Burst position with shine upon through BPSK after local NB training sequence carry out relevantly, obtain first group of correlation energy value; I road signal and Q road signal are carried out the 8PSK derotation respectively; And I road signal after the derotation and Q road signal carried out amplitude limit; Then I road signal behind the amplitude limit and Q road signal are sent into the second tap coefficient computing module; With the data of the corresponding training sequence of current Burst position with shine upon through BPSK after local NB training sequence carry out relevantly, obtain second group of correlation energy value; I road signal and Q road signal are carried out the GMSK derotation respectively; And I road signal after the derotation and Q road signal carried out amplitude limit; Then I road signal behind the amplitude limit and Q road signal are sent into the 3rd tap coefficient computing module; With the data of the corresponding training sequence of current Burst position with shine upon through BPSK after local DB training sequence carry out relevantly, obtain the 3rd group of correlation energy value.The function class of this tap coefficient computing module is similar to channel estimation module.

First group of aforementioned calculation all can adopt with the process of second group of correlation energy value: with the data of the corresponding training sequence of the I road signal position behind the amplitude limit with shine upon through BPSK after local NB training sequence carry out relevant; Obtain the correlation energy value of one group of I road signal; Carry out relevant with the local NB training sequence that passes through after BPSK shines upon the data of the corresponding training sequence of the Q road signal position behind the amplitude limit; Obtain the correlation energy value of one group of Q road signal; With the corresponding addition of these two groups of correlation energy values, can obtain first group of correlation energy value and second group of correlation energy value respectively.The process of calculating the 3rd group of correlation energy value can adopt: carry out relevant with the local DB training sequence that passes through after BPSK shines upon the data of the corresponding training sequence of the I signal behind amplitude limit position; Obtain the correlation energy value of one group of I road signal; Carry out relevant with the local DB training sequence that passes through after BPSK shines upon the data of the corresponding training sequence of the Q road signal position behind the amplitude limit; Obtain the correlation energy value of one group of Q road signal; With the corresponding addition of these two groups of correlation energy values, can obtain the 3rd group of correlation energy value.

Three groups of correlation energy values that obtain are sent into modulation blind Detecting module; This modulation blind Detecting module can be obtained the peak value of three groups of correlation energy values respectively; And compare the maximum in three peak values, and the modulation system that largest peaks is corresponding, as the modulation system of this Burst.For example, if the peak value of the 3rd group of correlation energy value is maximum,, thereby obtain the initial discriminative information of this Burst then with the DB of GMSK modulation modulation system as this Burst.

In said process,, when carrying out relevant treatment, it is also conceivable that the time of reaching, (Timing Of Arrival was hereinafter to be referred as TOA) sync bit information for the sync bit of harmonizing.

In the present embodiment, the modulation system of the data block of can configuration parameter ModulationType confirming to receive promptly work as ModulationType=0, and the data block that expression receives is the NB that GMSK modulates; Work as ModulationType=1, the data block that expression receives is the NB of 8PSK modulation; Work as ModulationType=2, the data block that expression receives is the DB of GMSK modulation.

The rest may be inferred, can obtain the initial discriminative information of first three Burst of data block.

Step 202, judge whether there is DB among first three Burst, if there is then execution in step 203, otherwise execution in step 213.

Step 203, judge whether the ModulationType of first Burst equals 2, if execution in step 204 then, otherwise execution in step 207;

Step 204, first Burst is carried out N judgement, N >=2 wherein;

For instance, present embodiment can begin to adjudicate one by one to the 3rd Burst from first Burst.If the initial court verdict of first Burst is the DB of GMSK modulation; And the DB that also modulates after carrying out adjudicating for N time for GMSK; Then need not adjudicate second Burst and the 3rd Burst again, and will judge that directly the modulation system of this data block is the DB of GMSK modulation; If the initial court verdict of first Burst is the DB of GMSK modulation but is not the DB of GMSK modulation after carrying out N judgement that perhaps the initial court verdict of first Burst is not the DB of GMSK modulation, then second Burst is carried out N judgement, by that analogy.As long as if there is a Burst to carry out the DB that adjudicates the back for the GMSK modulation N time among first three Burst; Then the modulation system of this data block is the DB of GMSK modulation; If neither one Burst is the DB of GMSK modulation carrying out after N the judgement among first three Burst, then adjudicate the modulation system of this data block again.Specifically; Again the method for judgement can be the process that repeats once initial judgement; Select initially to declare and calculate in three groups of correlation energy values that obtain modulation system that time big correlation energy value is corresponding modulation system as current Burst; Upgrade the modulation type of three Burst of this piece, and then with the modulation type of this piece of identical method judgement, if the modulation system that promptly obtains is identical; Then use the modulation system of the modulation system of first Burst as current data block, otherwise with the modulation system of the 3rd the Burst modulation system as current data block.

The detailed process that first Burst is adjudicated can for: to through the signal after the GMSK derotation with carry out relevant treatment through the DB training sequence after the BPSK mapping; Obtain first group of energy value, and calculate the second group of energy value that obtains through the signal after the GMSK derotation through auto-correlation.

Above-mentionedly obtain first group of energy value, and calculate the second group of energy value that obtains through the signal after the GMSK derotation, can comprise:

Application of formula (1) is calculated and is obtained said first group of energy value, and application of formula (2) is calculated and obtained said second group of energy value;

$\mathrm{DBEnergy}\left[i\right]={\left\{\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}(\mathrm{DataRe}[i+3+\mathrm{SyncPos}-2+j]\×\mathrm{DB}[j+6])\right\}}^2$ (1)

$+\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}\left(\mathrm{DataIm}\right[i+3+\mathrm{SyncPos}-2+j]\×\mathrm{DB}[j+6\left]\right){\}}^2,i=0,..,K-M$

$\mathrm{DataEngery}\left[i\right]=\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}({\mathrm{DataRe}[i+3+\mathrm{SyncPos}-2+j]}^2+\mathrm{DataIm}{[i+3+\mathrm{SyncPos}-2+j]}^2),---\left(2\right)$

i＝0，...，K-M

Wherein, DBEnergy [i] is first group of energy value, and DataEnergy [i] is second group of energy value; DataRe is the real part through the signal after the GMSK derotation; DataIm is the imaginary part through the signal after the GMSK derotation, and DB is the DB training sequence after shining upon through BPSK, and SyncPos is a sync bit information; K is the length through the signal after the GMSK derotation, and M is the length through the DB training sequence after the BPSK mapping.

Specifically, adopt the method for calculating tap coefficient, utilization length after the GMSK derotation is K _i(26≤K _i≤142, i=1 ..., the length of input data N-1) and the local DB training sequence after the BPSK mapping is M _i(M _i＜K _i, i=1 ..., data N-1) are correlated with, and promptly sliding window length is M _i, (i+1) inferior judgement can obtain K _i-M _i+ 1, (i=1 ..., N-1) individual correlation energy value is got maximum energy value MaxDBEnergy then respectively _i, i=1 ..., N-1 does like this and can avoid sync bit inaccurate, causes correlation energy very little.Wherein adjudicate times N and data length K _i, M _i, i=1 ..., the selection of N-1 is looked concrete implementation complexity and performance requirement and is decided.Below with N=2, promptly first Burst is once adjudicated to example again and describe.

Utilization is separated supination length through GMSK and is K ₁The training sequence length of=142 input data and the local DB after the BPSK mapping is M ₁=130 data are correlated with, and promptly sliding window length is 130, can obtain K ₁-M ₁+ 1=13 correlation energy value got maximum energy value MaxDBEnergy then.

Detailed process can for:

$\mathrm{CorrData}1\left[i\right]=\underset{j=0}{\overset{129}{\mathrm{\Σ}}}\left(\mathrm{DataRe}\right[i+3+\mathrm{SyncPos}-2+j]\×\mathrm{DB}[i+6]),$ i＝0，..，12

$\mathrm{CorrData}2\left[i\right]=\underset{j=0}{\overset{129}{\mathrm{\Σ}}}\left(\mathrm{DataIm}\right[i+3+\mathrm{SyncPos}-2+j]\×\mathrm{DB}[j+6\left]\right),$ i＝0，..，12

$\mathrm{CorrData}3\left[i\right]=\underset{j=0}{\overset{129}{\mathrm{\Σ}}}(\mathrm{DataRe}{[i+3+\mathrm{SyncPos}-2+j]}^2+\mathrm{DataIm}{[i+3+\mathrm{SyncPos}-2+j]}^2),$

i＝0，..，12

DB [i] wherein, i=0 ..., 135 for through 136 hybrid bitstream in the middle of the training sequence of BPSK mapping DB; DataRe and DataIm are respectively real part and the imaginary part through the input data after the GMSK derotation.The sync bit SyncPos of TOA is subtracted 2, and purpose is to find first path position, the original position of reading in as data.Because the length of DataRe [i] and DataIm [i] definition is 156, and TOA positional fluctuation scope be ± 4, so array may cross the border, and when program realizes, can increase Array Bound protection, promptly when data are crossed the border, makes that the data of reading in are zero.

According to 13 correlations of trying to achieve, can obtain maximum energy value, MaxDBEnergy and MaxDataEnergy,

$\mathrm{MaxDBEnergy}=\underset{i}{\max }\{\mathrm{CorrData}1{\left[i\right]}^2+{\mathrm{CorrData}2\left[i\right]}^2\},$ i＝0，..，12

$\mathrm{MaxDataEnergy}=\underset{i}{\max }\left\{\mathrm{CorrData}3\right[i\left]\right\},$ i＝0，..，12

A threshold T hreshold is set then, and relatively the size between MaxDBEnergy and the MaxDataEnergy is judged the modulation system of first Burst with this.

Step 205, judge that whether court verdict is the DB of GMSK modulation, if execution in step 206 then, otherwise execution in step 207.

If MaxDBEnergy >=Threshold * MaxDataEnergy; The modulation system of then judging this first Burst is the DB of GMSK modulation; If MaxDBEnergy＜Threshold * MaxDataEnergy, the modulation system of then judging this first Burst is not the DB of GMSK modulation.

If threshold value is too high, then can cause the misjudged probability of DB of GMSK modulation to increase; If thresholding is too low, the NB that then can not reduce the 8PSK modulation is mistaken for the probability of the DB of GMSK modulation, through emulation testing, threshold T hreshold=20 can be set.

For carrying out three judgements or the judgement more than three times, can reselect required K _iAnd M _i, carry out above-mentioned judgement again according to reselecting the DB training sequence that obtains after the signal length through after signal after the GMSK derotation and the process BPSK mapping, its principle is identical to repeat no more.

Step 206, the modulation system of confirming this data block are the DB of GMSK modulation, finish.

Step 207, judge whether the ModulationType of second Burst equals 2, if execution in step 208 then, otherwise execution in step 210;

Step 208, second Burst carried out N judgement, N >=2 wherein;

The process of second Burst being carried out N judgement is identical with the process of first Burst being carried out N judgement, repeats no more.

Step 209, judge that whether court verdict is the DB of GMSK modulation, if execution in step 206 then, otherwise execution in step 210.

Step 210, the 3rd Burst carried out N judgement, N >=2 wherein;

Step 211, judge that whether court verdict is the DB of GMSK modulation, if execution in step 206 then, otherwise execution in step 212.

Step 212, confirm the modulation system of preceding two Burst again, if identical, then the modulation system of specified data piece is the modulation system of first Burst, otherwise the modulation system of specified data piece is the modulation system of the 3rd Burst.

In the present embodiment; Modulation system to confirm first Burst again is an example; Which maximum in the inferior big correlation energy value of three groups of correlation energy values that can comparison of aforementioned obtain, the maximum corresponding modulation system of value in the correlation energy value that then will be time big is as the modulation system of first Burst; By that analogy, can obtain the modulation system of second Burst.If first Burst is identical with the modulation system of confirming again of second Burst; The modulation system of first Burst that then will confirm again is as the modulation system of this data block, otherwise with the modulation system of the 3rd the Burst modulation system as this data block.

Step 213, judge whether the modulation system of preceding two Burst is identical, if identical, then the modulation system of specified data piece is the modulation system of first Burst, otherwise the modulation system of specified data piece is the modulation system of the 3rd Burst.

Present embodiment is on the basis of existing modulation blind Detecting scheme; Increased the DB blind Detecting; On the basis of the initial discriminative information that obtains first three time slot of data block; If at least one initial discriminative information is the DB of GMSK modulation, then on the basis of initial judgement at least once adjudicating again for the DB time slot corresponding that GMSK modulates with judgement, and confirm the modulation system of this data block according to final court verdict information.Present embodiment provides the technical scheme of the DB of complete detection GMSK modulation, when having solved the DB that how to detect the GMSK modulation, can effectively reduce the probability of the DB that the NB erroneous judgement of 8PSK modulation is modulated for GMSK.

Fig. 4 is the structural representation of an embodiment of DB checkout gear of the present invention; As shown in Figure 4; The device of present embodiment can comprise: acquisition module 11, judgement acquisition module 12 and determination module 13, and wherein acquisition module 11 is used to obtain the initial discriminative information of first three time slot of data block; Judgement acquisition module 12 is used for when there is dummy burst DB in the initial discriminative information of said first three time slot, at least once adjudicating with said DB time slot corresponding, obtains court verdict information again; Determination module 13 is used for confirming according to said court verdict information the modulation system of said data block.

The device of present embodiment is identical with the realization principle of method embodiment shown in Figure 1, repeats no more.

Fig. 5 is the structural representation of another embodiment of DB checkout gear of the present invention; As shown in Figure 5; The device of present embodiment is on the basis of device shown in Figure 4; To once adjudicating again with said DB time slot corresponding, when obtaining court verdict information, said judgement acquisition module 12 specifically be used for to through the signal after the GMSK derotation with carry out relevant treatment through the DB training sequence after the BPSK mapping; Obtain first group of energy value, and calculate the second group of energy value that obtains through the signal after the GMSK derotation; Judge whether the maximum of said first group of energy value and the peaked ratio of second group of energy value surpass predetermined threshold value, and when surpassing said predetermined threshold value, the modulation system of obtaining this time slot is the court verdict information of the DB of GMSK modulation.If in said judgement acquisition module 12 first three time slot of judgement the court verdict information of a time slot being arranged is the DB of GMSK modulation, then said determination module confirms that the modulation system of said data block is the DB of GMSK modulation; If the court verdict information of said first three time slot of judgement acquisition module judgement all is not the DB of GMSK modulation, then said determination module is confirmed the modulation system of said data block again.

To carrying out more than twice or twice judgement again with said DB time slot corresponding; When obtaining court verdict information; Said judgement acquisition module 12 specifically is used to reselect twice or twice above judgement is required through the length of the signal after the GMSK derotation and through the length of the DB training sequence after the BPSK mapping; Obtain first group of energy value and second group of energy value according to reselecting recomputating of obtaining, and obtain court verdict information according to recomputating first group of energy value and second group of energy value of obtaining through the signal after the GMSK derotation and through the DB training sequence after the BPSK mapping.

Further, acquisition module 11 can comprise: receiving element 111, acquiring unit 112 and definite unit 113, and wherein, receiving element 111 is used in four time slots, receiving the first via signal and the second road signal; Acquiring unit 112 is used at first three time slot; To carrying out relevant treatment with the training sequence that passes through the NB after BPSK shines upon respectively through the first via signal after the GMSK derotation and the second road signal; Obtain first group of correlation energy value; To carrying out relevant treatment with the training sequence that passes through the NB after BPSK shines upon respectively through the first via signal after the 8PSK derotation and the second road signal; Obtain second group of correlation energy value,, obtain the 3rd group of correlation energy value carrying out relevant treatment with the training sequence that passes through the DB after BPSK shines upon respectively through the first via signal after the GMSK derotation and the second road signal; Confirm that unit 113 is used for confirming the maximum in first group of correlation energy value, second group of correlation energy value and the 3rd group of correlation energy value respectively at first three time slot, and in three maximums will confirming the modulation system of a maximum correspondence as the initial discriminative information of this time slot.

The device of present embodiment is identical with the realization principle of method embodiment shown in Figure 2, repeats no more.

Said apparatus embodiment of the present invention can adopt structured flowchart shown in Figure 3 to dispose in implementation procedure, repeats no more.

Said apparatus embodiment of the present invention; On the basis of existing modulation blind Detecting scheme; Increased the DB blind Detecting, on the basis of the initial discriminative information that obtains first three time slot of data block, if at least one initial discriminative information is the DB of GMSK modulation; Then on the basis of initial judgement at least once adjudicating again for the DB time slot corresponding that GMSK modulates with judgement, and confirm the modulation system of this data block according to final court verdict information.Present embodiment provides the technical scheme of the DB of complete detection GMSK modulation, when having solved the DB that how to detect the GMSK modulation, can effectively reduce the probability of the DB that the NB erroneous judgement of 8PSK modulation is modulated for GMSK.

What should explain at last is: above embodiment is only in order to technical scheme of the present invention to be described but not limit it; Although the present invention has been carried out detailed explanation with reference to preferred embodiment; Those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technical scheme of the present invention, also can not make amended technical scheme break away from the spirit and the scope of technical scheme of the present invention and these are revised or be equal to replacement.

Claims (7)

1. a dummy burst detection method is characterized in that, comprising:

Obtain the initial discriminative information of first three time slot of data block;

If have dummy burst DB in the initial discriminative information of said first three time slot; Then the DB training sequence after shining upon with process binary phase shift keying BPSK through the signal after the GMSK GMSK derotation is carried out relevant treatment; Obtain first group of energy value; And, obtain second group of energy value to carrying out auto-correlation processing through the signal after the GMSK derotation;

Judge whether the maximum of said first group of energy value and the peaked ratio of second group of energy value surpass predetermined threshold value, and when surpassing said predetermined threshold value, the modulation system of obtaining this time slot is the court verdict information of the DB of GMSK modulation;

If in the initial discriminative information of said first three time slot with the DB time slot corresponding in, the court verdict information that a time slot is arranged is the DB of GMSK modulation, then the modulation system of said data block is the DB that GMSK modulates;

If the court verdict information with the DB time slot corresponding in the initial discriminative information of said first three time slot all is not the DB of GMSK modulation, then adjudicate the modulation system of said data block again.

2. DB detection method according to claim 1 is characterized in that, to carrying out twice or twice above judgement with said DB time slot corresponding, obtains court verdict information again, comprising:

Reselect through the length of the signal after the GMSK derotation and the length of the DB training sequence after the process BPSK mapping; Obtain first group of energy value and second group of energy value according to reselecting recomputating of obtaining, and obtain court verdict information according to recomputating first group of energy value and second group of energy value of obtaining through the signal after the GMSK derotation and through the DB training sequence after the BPSK mapping;

Repeat above-mentioned steps, up to accomplishing the operation of carrying out judgement more than twice or twice again.

3. DB detection method according to claim 1; It is characterized in that; Said to carrying out relevant treatment through the DB training sequence after signal after the GMSK GMSK derotation and the process binary phase shift keying BPSK mapping, obtain first group of energy value, and the signal after the process GMSK derotation is carried out auto-correlation processing; Obtain second group of energy value, comprising:

Application of formula (1) is calculated and is obtained said first group of energy value, and application of formula (2) is calculated and obtained said second group of energy value;

$\mathrm{DBEnergy}\left[i\right]=\{\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}\left(\mathrm{DataRe}\right[i+3+\mathrm{SyncPos}-2+j]\×\mathrm{DB}[j+6\left]\right){\}}^2$ (1)

$+\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}\left(\mathrm{DataIm}\right[i+3+\mathrm{SyncPos}-2+j]\×\mathrm{DB}[j+6\left]\right){\}}^2,i=0,..,K-M$

$\mathrm{DataEngery}\left[i\right]=\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}\left(\mathrm{Data\; Re}\right[i+3+\mathrm{SyncPos}-2+j{]}^2+\mathrm{Data\; Im}[i+3+\mathrm{SyncPos}-2+j{]}^2),---\left(2\right)$

i＝0，..，K-M

Wherein, DBEnergy [i] is first group of energy value, and DataEnergy [i] is second group of energy value; DataRe is the real part through the signal after the GMSK derotation; DataIm is the imaginary part through the signal after the GMSK derotation, and DB is the DB training sequence after shining upon through BPSK, and SyncPos is a sync bit information; K is the length through the signal after the GMSK derotation, and M is the length through the DB training sequence after the BPSK mapping.

4. according to the described DB detection method of arbitrary claim in the claim 1～3, it is characterized in that the said initial discriminative information that obtains first three time slot of data block comprises:

In a time slot, receive the first via signal and the second road signal;

To carrying out relevant treatment with the training sequence that passes through the normal burst NB after BPSK shines upon respectively through the first via signal after the GMSK derotation and the second road signal; Obtain first group of correlation energy value; To carrying out relevant treatment with the training sequence that passes through the NB after BPSK shines upon respectively through the first via signal after the octal system phase shift keying 8PSK derotation and the second road signal; Obtain second group of correlation energy value; To carrying out relevant treatment with the training sequence that passes through the DB after BPSK shines upon respectively, obtain the 3rd group of correlation energy value through the first via signal after the GMSK derotation and the second road signal;

Confirm the maximum in first group of correlation energy value, second group of correlation energy value and the 3rd group of correlation energy value respectively, and in three maximums will confirming the modulation system of a maximum correspondence as the initial discriminative information of this time slot;

Repeat above-mentioned steps, obtain the initial discriminative information of said first three time slot of data block.

5. a dummy burst checkout gear is characterized in that, comprising:

Acquisition module is used to obtain the initial discriminative information of first three time slot of data block;

The judgement acquisition module; Be used for when there is dummy burst DB in the initial discriminative information of said first three time slot; DB training sequence to after shining upon with process binary phase shift keying BPSK through the signal after the GMSK GMSK derotation carries out relevant treatment; Obtain first group of energy value, and, obtain second group of energy value carrying out auto-correlation processing through the signal after the GMSK derotation; Judge whether the maximum of said first group of energy value and the peaked ratio of second group of energy value surpass predetermined threshold value, and when surpassing said predetermined threshold value, the modulation system of obtaining this time slot is the court verdict information of the DB of GMSK modulation;

Determination module is used for when said first three time slot of judgement acquisition module judgement has the court verdict information of a time slot to be the DB of GMSK modulation, and the modulation system of confirming said data block is the DB of GMSK modulation; When the court verdict information of said first three time slot of judgement acquisition module judgement all is not the DB of GMSK modulation, adjudicate the modulation system of said data block again.

6. DB checkout gear according to claim 5; It is characterized in that; To carrying out more than twice or twice judgement again with said DB time slot corresponding; When obtaining court verdict information; Said judgement acquisition module specifically is used to reselect twice or twice above judgement is required through the length of the signal after the GMSK derotation and through the length of the DB training sequence after the BPSK mapping; Obtain first group of energy value and second group of energy value according to reselecting recomputating of obtaining, and obtain court verdict information according to recomputating first group of energy value and second group of energy value of obtaining through the signal after the GMSK derotation and through the DB training sequence after the BPSK mapping;

Repeat above-mentioned steps, up to accomplishing the operation of carrying out judgement more than twice or twice again.

7. according to claim 5 or 6 described DB checkout gears, it is characterized in that said acquisition module comprises:

Receiving element is used in four time slots, receiving the first via signal and the second road signal;

Acquiring unit; Be used at first three time slot; To carrying out relevant treatment with the training sequence that passes through the normal burst NB after BPSK shines upon respectively through the first via signal after the GMSK derotation and the second road signal; Obtain first group of correlation energy value,, obtain second group of correlation energy value carrying out relevant treatment with the training sequence that passes through the NB after BPSK shines upon respectively through the first via signal after the octal system phase shift keying 8PSK derotation and the second road signal; To carrying out relevant treatment with the training sequence that passes through the DB after BPSK shines upon respectively, obtain the 3rd group of correlation energy value through the first via signal after the GMSK derotation and the second road signal;

Confirm the unit; Be used for confirming the maximum in first group of correlation energy value, second group of correlation energy value and the 3rd group of correlation energy value respectively at first three time slot, and in three maximums will confirming the modulation system of a maximum correspondence as the initial discriminative information of this time slot.

Images