CN101102147B - A time advance estimation method applicable to GSM/EDGE system - Google Patents
A time advance estimation method applicable to GSM/EDGE system Download PDFInfo
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- CN101102147B CN101102147B CN2007101123583A CN200710112358A CN101102147B CN 101102147 B CN101102147 B CN 101102147B CN 2007101123583 A CN2007101123583 A CN 2007101123583A CN 200710112358 A CN200710112358 A CN 200710112358A CN 101102147 B CN101102147 B CN 101102147B
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Abstract
The invention is concerned with the time advance prediction method for GSM/EDGE system. The method is to find the time advance precision quickly, according to the obtained time advance early volume that is obtained with the energy computing, comparing method within the channel. The method is simple and can be sued in all situations such as multi-pathway environment, voice or data operation, and to the final terminal situation and basic station system.
Description
Technical field
The invention belongs to field of mobile communication, relate in particular to Timing Advance (TA-TimingAdvance) method of estimation of a kind of GSM/EDGE of being applicable to system.
Background technology
GSM has obtained extensive use as second generation mobile cellular communication system in worldwide.But along with the variation with bearer service of developing rapidly of mobile communication technology, people constantly increase the demand of data business.Therefore, producers one after another exploitation new, speed mobile data communication technology faster, wherein most typical is exactly HCSD (two-forty circuit switched data) and GPRS (general packet radio service) technology.The flank speed of HCSD can reach 57.6kbit/s.GPRS has introduced the mode of classification exchange first at core network, become GSM the only way which must be passed to the evolution of third generation network, can provide flank speed to the user is the link of 171kbit/s, though HSCSD and GPRS have improved message transmission rate to a certain extent, but because it still adopts is the modulation system of GMSK (GMSK (Guassian Minimum Shift Keying)), thereby the transmission rate that it provided still can not satisfy people's requirement more and more higher to communication system far away, therefore be necessary to adopt more advanced communication and signal processing technology, with the capacity of further expansion gsm system.Ever-increasing in order to satisfy people to the demand of high-speed data service and the demand of whole Communications Market, strengthen the competitiveness of existing system, the TIA of the U.S. and European Telecommunication Standard chemistry can ETSI be united and has been proposed a kind of wireless access technology-EDGE based on TDMA (Enhanced Data Rates for GSM Revolution), provides data communication service at a high speed with existing GSM frequency range.
In order to provide higher data communication rates in existing cellular system, EDGE has introduced many level digitals modulation system---the 8PSK modulation.For the 8PSK modulation, each modulation symbol can be mapped as 3 bits, thereby compares the bit rate and the spectrum efficiency that can provide higher with GMSK modulation mode, and its implementation complexity does not increase a lot.The modulation system of the GMSK that uses in the gsm system also is the part of EDGE modulation system.The character rate of two kinds of modulation systems all is 271kbit/s, and the net bit rate of every time slot is respectively 22.8kbit/s (GMSK) and 69.2kbit/s (8PSK).
Still be new EDGE system for original gsm system no matter, the signal that transmitter sent all will be through the influence of multipath channel, thereby in order to overcome the intersymbol interference that multi-path environment causes, all needs a channel equalizer at receiving terminal usually.According to gsm protocol, send according to burst (Burst) in the data to be sent of making a start, and in the middle of each burst, placed one long be 26 training sequence.In order to guarantee the equalization performance of equalizer, the general original position that requires to obtain split-hair training sequence of receiving terminal promptly need obtain precise time lead (TA) at receiving terminal.In conventional method, receiving terminal carries out relevant in each character position and the burst that receives with known training sequence, and have the TA that maximum related value corresponding symbol position is estimation.In real system, the influence that this method is subjected to multi-path environment is very big, thereby causes the inaccurate of TA calculating, and then influences the equilibrium result of system.
In the patent No. is that the method for employing is for the N that receives earlier burst, makes training sequence carry out related operation with them respectively in the United States Patent (USP) " Timing Estimation for GSM Bursts Basedon Past History " of US6724837; The maximum of the correlated series that obtains by searching obtains this N burst TA separately respectively then, and this N TA that obtains is asked average; At last, on the basis of the TA mean value of being tried to achieve, estimate the TA separately of follow-up M burst.In this patent, accuracy for guarantee to obtain follow-up M burst Timing Advance, the number N value of burst that just requires to be used to calculate initialization TA is big as far as possible, this patent does not guarantee to be used to calculate the accuracy of N TA that happens suddenly of initialization TA value, if thereby the N value is excessive, because the performance of N the burst that receives in advance can't be guaranteed, thereby the overall performance of receiver can't be guaranteed.On the other hand, this patent requires the TA of the burst of receiving is continuously averaged, and for based on Circuit-switched speech business, this method is feasible; But for based on the packet-switched data business, because the data of adjacent 2 bursts that receive front and back may not be all from same transmitter, thereby concerning based on the business of packet switching, this patent can't be used, especially for the gsm system with EDGE function, this method has lost practical significance especially.
In the patent No. is in the European patent " Iterative Estimation of Timing in GSMBursts " of US6859491 correspondence, has proposed the go forward side by side method of line data equilibrium of a kind of iteration lead estimated time.For each burst that receives, this patent supposes that at first TA has an initial value, then all making TA add 1 in the circulation each time, up to being recycled to a certain times N; And in each circulation, all carry out equalizing demodulation to receiving data according to given TA; On this basis, make in known training sequence and the equilibrium result sequence on the correspondence position carry out relevant and the record correlation; At last, having the pairing TA value of maximum related value in the sequence of correlation values that obtains is exactly the real value that requires.This patent is compared with top patent, has overcome the shortcoming of above-identified patent, and it not only can be used for based on Circuit-switched speech business, and can be used for based on the packet-switched data business.This patent will be carried out N demodulation to received signal when asking TA, if N is too big, then calculates too complexity, thereby is difficult to be applied in the real system.
The shortcoming of technical scheme that above patent discloses is not too suitable to existing GSM/EDGE system, is not that computation complexity is too high, is exactly application difficult, thereby is necessary to find a kind of actual, method of hunting time lead more flexibly.
Summary of the invention
Technical problem to be solved by this invention provides a kind of actual, method of hunting time lead faster.
For solving the problems of the technologies described above, the invention provides the time advance estimation method of a kind of GSM/EDGE of being applicable to system, comprising:
A) carry out the symbol despining according to the difference of the modulation system of the burst that receives;
B) utilize data estimation channel parameter sequence after the despining;
C) calculating preestablishes the average of the channel guess value energy of length;
D) seek the position of energy, be designated as L greater than the footpath of average energy
0～L
N
E) judge L
N-L
0Whether less than K
1* M and L
0＞K
2* M is that the initial value that Timing Advance then is set is L
0-K
2* M; Not that the initial value that Timing Advance then is set is L
0
Wherein, M is the sampling multiple, and K1 is the disperse length of channel, and K2 is a predefined thresholding;
F) initial value with the Timing Advance of above-mentioned setting is a starting point, calculates the continuous K of each sampling
1The energy in root footpath and; Seek M energy and middle ceiling capacity corresponding sampling points m; It is that the aforementioned initial value that Timing Advance is set adds m that the acquisition precise time shifts to an earlier date value.
According to the method for the invention, to search out the initial value of Timing Advance than fast speeds, can find the exact value of Timing Advance fast according to the initial value of the Timing Advance that obtains, this method computation complexity less and in various situations (system is in static state or multi-path environment, be used for speech business or data service, for terminal system or base station system) under all be suitable for.
Description of drawings
Fig. 1 has provided the basic schematic diagram of GSM/EDGE system transceiver.
Fig. 2 is the data format of conventional burst in the GSM/EDGE system.
Fig. 3 is that Timing Advance is estimated flow chart.
Fig. 4 is a NB single-time sampling channel guess value energy diagram.
Embodiment
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme.For those skilled in the art that, from the description to the inventive method, above-mentioned and other purposes of the present invention, feature and advantage will be apparent.
With reference to Fig. 1, at transmitting terminal, the data of source encoding module 101 output are sent into behind the chnnel coding interleaving block 102 through sending into wireless channel behind base band GMSK/8PSK modulation module 103, up-conversion module 104 and the transmitting antenna 105; At receiving terminal, the signal that reception antenna 106 is received is sent into signal demodulation module 109 and Timing Advance and channel parameter estimation module 108 respectively through down conversion module 107, module 108 is also sent into signal demodulation module 109 after estimating channel parameter and Timing Advance, signal demodulation module 109 is collected mail according to the information butt joint of receiving and number is carried out demodulation then, demodulation result is sent into deinterleaving and decoder module 110, and finally through 111 outputs of source coding module.
Fig. 2 is the data format of conventional burst in the GSM/EDGE system.For conventional burst NB (Normal Burst), its information data is divided into two groups of each 58 symbols, and wherein 57 is data, and another one represents that for stealing the frame bit these data are user data or signaling.Inserted 26 training sequence between this two segment data, wherein each 5bit of the beginning and end of 26bit is the protection interval, and middle 16bit data are used for estimating channel parameter and Timing Advance.3 tail bits " 0 " are added on the both sides of useful information section.The last of NB data is the time of 8.25bit, do not send out signal any, as the protection section of adjacent time-slots.
With reference to Fig. 3, the estimation of Timing Advance of the present invention follows these steps to carry out:
Step 301, receiving terminal 106,107 modules receive burst and send into Timing Advance and channel parameter estimation module 108.
Step 302, the difference of the modulation system of the burst that foundation receives is carried out the symbol despining according to GMSK or 8PSK respectively.
Step 303 is utilized the data estimation channel parameter sequence after the despining.
Step 304, the average of the channel guess value energy of calculating certain-length, this length span is 22～24; For NB with insert pulse AB (Access Burst) because the length of search is different, the length difference of calculating energy average.
Step 305 is sought the position of energy greater than the footpath of average energy, is designated as L
0～L
N
Step 306 is judged L
N-L
0Whether less than K
1* M and L
0＞K
2* M, if then change step 308, wherein M is sampling multiple, K
1Be the disperse length of channel, K
2Be one and get fixed thresholding that span is 1～3; If not then entering step 307.
Step 307, it is L that the TA initial value is set
0
Step 308, it is L that the TA initial value is set
0-K
2* M.
Step 309 is a starting point with the TA initial value, calculates the continuous K of each sampling
1The energy in root footpath and.
Step 310 is sought M energy and middle ceiling capacity corresponding sampling points m
Step 311 is exported accurate TA value and is added m for the TA initial value.
Step 312 utilizes this accurate TA value to carry out follow-up signal demodulation.
Fig. 4 is the channel guess value energy diagram of the NB of single-time sampling, and what horizontal solid line was represented among the figure is average energy.Utilize method of the present invention to carry out TA and estimate, then L
0=3, L
N=12, at K
2The TA exact value that obtained at last in=1 o'clock is 2.
The time advance estimation method of the pin of the present invention at first method of the average by simple calculating channel valuation energy obtains the initial value of TA, on the basis of the initial TA value of gained, further obtains accurate TA and estimate in sampled point then.This method is compared with existing method, and no matter receiving system is in static state or multi-path environment, no matter is used for speech business or data service, can both finish the Timing Advance estimation of degree of precision with low computation complexity.
The front provides the description to preferred embodiment, so that any technical staff in this area can use or utilize the present invention.Various modifications to these embodiment are conspicuous to those skilled in the art, can be applied to total principle described here each other embodiment and do not use creativeness.Thereby, the embodiment shown in the present invention will be not limited to here, and the wide region of principle that should disclose and new feature according to meeting here.
Claims (4)
1. a time advance estimation method that is applicable to the GSM/EDGE system is characterized in that, comprising:
The difference of the modulation system of the burst that A, foundation receive is carried out the symbol despining;
B, utilize the data estimation channel parameter sequence after the despining;
C, calculating preestablish the average of the channel guess value energy of length;
D, seek the position of energy, be designated as L greater than the footpath of average energy
0～L
N
E, judgement L
N-L
0Whether less than K
1* M and L
0＞K
2* M is that the initial value that Timing Advance then is set is L
0-K
2* M; Not that the initial value that Timing Advance then is set is L
0
Wherein, M is sampling multiple, K
1Be the disperse length of channel, K
2It is a predefined thresholding;
F, be starting point, calculate the continuous K of each sampling with the initial value of the Timing Advance of above-mentioned setting
1The energy in root footpath and; Seek M energy and middle ceiling capacity corresponding sampling points m; It is that the aforementioned initial value that Timing Advance is set adds m that the acquisition precise time shifts to an earlier date value.
2. the time advance estimation method that is applicable to the GSM/EDGE system as claimed in claim 1 is characterized in that: the span of channel length is 22～24 among the described step C.
3. the time advance estimation method that is applicable to the GSM/EDGE system as claimed in claim 1 is characterized in that: described thresholding K
2Span be 1～3.
4. the time advance estimation method that is applicable to the GSM/EDGE system as claimed in claim 1 is characterized in that: channel length is got different length to conventional burst respectively with the access pulse among the described step C.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101741785B (en) * | 2009-12-21 | 2012-12-19 | 中兴通讯股份有限公司 | Methods and system for recognizing random access pulse signals |
| CN102158949A (en) * | 2011-03-22 | 2011-08-17 | 京信通信系统（中国）有限公司 | Synchronous extraction method of GSM (global system for mobile communications)/EDGE (enhanced data rates for GSM evolution) communication system and device thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5711003A (en) * | 1993-05-14 | 1998-01-20 | Alcatel Mobile Communication France | Method for determining timing advance during handover |
| EP0996237A1 (en) * | 1998-10-19 | 2000-04-26 | Lucent Technologies Inc. | Timing estimation for GMS bursts based on previously determined average values |
| CN1913421A (en) * | 2005-08-08 | 2007-02-14 | 中兴通讯股份有限公司 | Time lead estimating method suitable for GSM/EDGE system |
-
2007
- 2007-06-11 CN CN2007101123583A patent/CN101102147B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5711003A (en) * | 1993-05-14 | 1998-01-20 | Alcatel Mobile Communication France | Method for determining timing advance during handover |
| EP0996237A1 (en) * | 1998-10-19 | 2000-04-26 | Lucent Technologies Inc. | Timing estimation for GMS bursts based on previously determined average values |
| CN1913421A (en) * | 2005-08-08 | 2007-02-14 | 中兴通讯股份有限公司 | Time lead estimating method suitable for GSM/EDGE system |
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Effective date of registration: 20171206 Address after: Tiefu iron rich street Pizhou city 221331 Jiangsu city of Xuzhou province (Cultural Center) Patentee after: Pan Rongqiong Address before: 510640 Guangdong City, Tianhe District Province, No. five, road, public education building, unit 371-1, unit 2401 Patentee before: GUANGDONG GAOHANG INTELLECTUAL PROPERTY OPERATION Co.,Ltd. Effective date of registration: 20171206 Address after: 510640 Guangdong City, Tianhe District Province, No. five, road, public education building, unit 371-1, unit 2401 Patentee after: GUANGDONG GAOHANG INTELLECTUAL PROPERTY OPERATION Co.,Ltd. Address before: 518057 Guangdong Shenzhen City, Nanshan District high tech Industrial Park, Zhongxing communication building, south of science and technology road, A Patentee before: ZTE Corp. |
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