CN100591063C - Method and apparatus for acquiring circulating prefix-length information - Google Patents
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Abstract
The method comprises: based on the received data sequence, getting the symbol location of synchronous channel; according to the symbol location and the foreknowledge information of the symbol locationof the synchronous channel, estimating the differential correlation values of two reference symbol columns being in different cyclic prefix lengths and having correlation; comparing said each deferential correlation value, and taking the cyclic prefix length correlative to the maximum different correlation value as true. Said method can be realized after the rough synchronization of the synchronous channel and has no influence on the fine synchronization.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of acquisition methods and device of circulating prefix-length information.
Background technology
The frame structure form of the TD-SCDMA system of evolution as shown in Figure 1.Among the figure, each wireless sub-frame is by 7 common time slots (TS0～TS6) constitute with three special time slots.Wherein, common time slot is used for transmitting data; three special time slots are respectively the transmission that DwPTS (downlink pilot frequency channel) is used for the down-going synchronous information of system); UpPTS (ascending pilot channel) is used for the uplink synchronous information transmission that the user inserts, and GP (translation and protection time slot) is used to provide the time interval of descending sending time slots to up sending time slots conversion.In order to make mobile communication technology in the longer time, keep certain technology competition advantage, carried out the Long Term Evolution plan (LTE) of 3GPP at present in the world.In a kind of TDD evolution standard of this plan is worked out, in order to take into account the demand with existing TD-SCDMA coexistence of systems, adopted essentially identical with it frame structure, as shown in Figure 1, but on the multi-access mode that physical layer adopted, abandoned the existing C dma mode, and adopted OFDM (OFDM) mode and corresponding multiple access technology.In this TDD evolution system,, in the DwPTS special time slot, there is 1 OFDM symbol to be used for the estimation of down-going synchronous and frequency deviation as descending synchronous signal channel according to system requirements.Can obtain the subframe timing information by down-going synchronous OFDM symbol in the DwPTS time slot, for simplicity, referred to herein as evolution TD-SCDMA system.
Ofdm system generally need adopt cyclic prefix CP to overcome the influence of multidiameter delay.In the LTE system, at present clear and definite different CP length user demand., need the OFDM symbol to have long cyclic prefix CP and partly overcome big multidiameter delay problem under the big or multicast service situation at radius of society.Therefore the CP of OFDM symbol partly has long CP and two kinds of selections of short CP, is applied to different scenes respectively.According to system requirements, all there are two reference signals in each time slot, is used for channel estimating and carries some sub-district relevant informations.According to the regulation of 3GPP 25.814 technical reports, first reference signal (referencesymbol) is arranged in first OFDM character position of time slot, and second reference signal is arranged in third from the bottom OFDM character position of time slot, (R1 and R2) as shown in Figure 2.
The CP length of each time slot can be different in a radio frames, and CP length difference will cause OFDM symbol quantity and reference signal position difference in each time slot, and then has influence on the detection and the demodulation of OFDM symbol.Generally speaking, for short CP, 9 OFDM symbols are arranged in the time slot; For long CP, 8 OFDM symbols are arranged in the time slot.As seen, according to the CP length information, just can determine the timing information of OFDM quantity and reference signal.
In addition, the SCH signal is positioned at the DwPTS special time slot, and CP length in TS 0 to the TS6 time slot and SCH character position are irrelevant.Only can not obtain the timing information of other time slots CP length and reference signal according to the timing information of SCH signal.Therefore, how detecting CP length and reference signal position is the problem that is faced at present.
At present, DoCoMo company proposes a kind of method that detects CP length that solves.Please shown in Figure 3 in conjunction with reference.Its main thought is to allow the SCH symbol take last OFDM character position in the FDD subframe, no matter adopts the still short CP of long CP, and the position of SCH symbol in subframe is identical, simultaneously, carries the CP length information in the SCH signal.Therefore, in the cell initial search process,, just can know the timing information of reference signal by inference by the CP length information among the demodulation SCH.
According to the cell initial search flow process of the TD-SCDMA system of evolution, it is synchronously thick and to carry out frequency rough synchronous at first to carry out time of SCH downlink synchronous signal, then will utilize two reference signals of TS0 to carry out that frequency deviation is smart to be calculated synchronously.In SCH, carry the CP length information if adopt scheme shown in Figure 3, just need SCH descending thick synchronously after to the demodulation of SCH signal, obtain CP length and know the reference signal position by inference, after this could carry out the smart follow-up cell initial search process such as synchronous of frequency deviation by two reference signals.
But, in that the smart CP length information that demodulation obtains to the SCH signal before synchronously of whole and time is not inaccurate through the overdeviation accurate adjustment, and then must cause reference signal inaccurate, the synchronous calculating of carrying out according to reference signal of smart frequency deviation also can be inaccurate at last, can cause the cell initial search failure when serious, so adopt scheme shown in Figure 3 also inapplicable for the TD-SCDMA system of evolution.
Summary of the invention
The object of the present invention is to provide a kind of acquisition method of circulating prefix-length, to solve TD-SCDMA and the inapplicable technical problem of existing method by in synchronization channel symbols, carrying circulating prefix-length information for evolution.
For solving the problems of the technologies described above, the objective of the invention is to be achieved through the following technical solutions a kind of acquisition methods of circulating prefix-length information:, obtain the character position of synchronizing channel according to receiving data sequence; According to the character position and the pre-known information of described synchronizing channel, the difference correlation of estimating under the different circulating prefix-lengths, having two row reference symbols of correlation; More above-mentioned each difference correlation, the circulating prefix-length of maximum difference correlation correspondence is true.
Preferably, also comprise by broadcast channel and read the time slot circulating prefix-length information that other are not known.
According to the character position and the pre-known information of synchronizing channel, the position of calculating under the different circulating prefix-lengths, having two row reference symbols of correlation; According to described reference symbol position, calculate the difference correlation of reference symbol in the receiving data sequence.
Preferably, described maximum difference correlation corresponding reference character position is the physical location of reference symbol in the described receiving data sequence.Described pre-known information comprises the timing relationship between dissimilar circulating prefix-lengths and reference symbol and the synchronization channel symbols.
Preferably, described two row reference symbols with correlation belong to the TS0 time slot.Described correlation is a relativity of time domain.
A kind of deriving means of circulating prefix-length information comprises thick lock unit, is used for according to receiving data sequence, obtains the character position of synchronizing channel; Suppose processing unit, be used for character position and pre-known information unit, the difference correlation of estimating under the different circulating prefix-lengths, having two row reference symbols of correlation according to described synchronizing channel; Comparing unit is used for each difference correlation that more described hypothesis processing unit draws, and the circulating prefix-length of maximum difference correlation correspondence is true.
Preferably, also comprise the broadcast channel reading unit, be used for reading the time slot circulating prefix-length information that other are not known by broadcast channel.
Described hypothesis processing unit specifically comprises the locator unit, is used for according to synchronization channel symbols position and pre-known information the position of calculating under the different circulating prefix-lengths, having two row reference symbols of correlation; Difference correlation value calculation subelement is used for according to described reference symbol position, calculates the difference correlation of reference symbol in the receiving data sequence.
Dissimilar circulating prefix-length informations is preserved in described pre-known information unit, and the timing relationship between reference symbol and the synchronization channel symbols.
Preferably, described two row reference symbols belong to the TS0 time slot, have relativity of time domain between them.
Above technical scheme in the present invention, is obtained the character position of synchronizing channel as can be seen according to receiving data sequence; Then according to the character position and the pre-known information of described synchronizing channel, the difference correlation of estimating under the different circulating prefix-lengths, having two row reference symbols of correlation, each difference correlation that relatively calculates at last, the circulating prefix-length that maximum difference correlation adopts is exactly real circulating prefix-length, and promptly hypothesis is set up.As seen, the acquisition methods of this circulating prefix-length, not just to finish the thick inaccurate CP length information that just utilizes SCH to demodulate after synchronously of SCH, carry out the subsequent fine adjustment, but simultaneously at the timing position that detects reference symbol with correlation, can know real circulating prefix-length, therefore be applicable to the cell initial search flow process of evolution TD-SCDMA system fully.
Description of drawings
Fig. 1 is the frame structure schematic diagram of the TD-SCDMA system of evolution;
Fig. 2 is reference signal structure schematic diagram in the evolution TD-SCDMA TS0 of the system time slot;
Fig. 3 is a kind of frame structure schematic diagram of existing detection CP length;
Fig. 4 is the acquisition methods embodiment flow chart of circulating prefix-length information of the present invention;
Fig. 5 is the structural representation of TS0 time slot in the tdd frame structure;
Fig. 6 is the topology example figure of the deriving means of circulating prefix-length information of the present invention.
Embodiment
Core concept of the present invention is that the difference correlation that calculates under the different circulating prefix-lengths, has two row reference symbols of correlation judges that according to the size of difference correlation being assumed to be of which Cyclic Prefix is true then.
See also Fig. 4, the acquisition methods embodiment flow chart of a kind of circulating prefix-length information disclosed by the invention.
Step 110:, obtain the character position of synchronous channel SCH according to receiving data sequence.In the cell initial search process, need the SCH symbol be positioned according to receiving data sequence at first, so that determine the original position of received signal subframe.Concrete implementation has multiple, the relevant coarse synchronizing method of thick synchronous searching method of time domain and difference for example, and these can know the character position of SCH, because this step can realize by existing multiple mode, therefore no longer describe in detail.
Step 120: the difference correlation of according to the character position and the pre-known information of described synchronous channel SCH, estimating under the different circulating prefix-lengths, having two row reference symbols of correlation.Described correlation both can be a relativity of time domain, also can be frequency domain correlation.Preferably, utilize the processing procedure of relativity of time domain more easy, but utilize frequency domain correlation to adopt similar principles also can realize.
Described pre-known information comprises dissimilar circulating prefix-lengths, and why the timing relationship between reference symbol and the synchronization channel symbols says that dissimilar cyclic prefix CP length is the information that can predict, be that CP length kind can be not too many because in present various communication systems.For example the CP length in the evolution scheme of TD-SCDMA only is two kinds, is 1.25M in bandwidth, and sample rate is under the situation of 1.92M, and the FFT partial-length of OFDM symbol is 128 sampling points, and long CP length is 32 sampling points, and short CP length is 14 sampling points.As seen, for user terminal UE, all kinds CP length information that the storage base station system is used is to realize very easily.For the timing relationship between reference symbol and the synchronization channel symbols, normally by standard code, for example according to the regulation of 3GPP 25.814, first reference signal (referencesymbo l) is arranged in first OFDM character position of time slot (being called first reference symbol again), second reference signal is arranged in third from the bottom OFDM character position of time slot (being called second reference symbol again), therefore, user terminal UE also can predict these information.
This step specifically comprises: (1) according to the character position and the pre-known information of synchronizing channel, the position of calculating under the different circulating prefix-lengths, having two row reference symbols of correlation.The front is talked about through after the step 110, can know the SCH character position, knows above-mentioned pre-known information so again, the position that can know by inference under the different circulating prefix-lengths, have two row reference symbols of correlation.(2), calculate the difference correlation of reference symbol in the receiving data sequence according to described reference symbol position.
Be example with the TS0 time slot in the evolution TD-SCDMA system below, sketch the specific implementation process of this step.In this system, the CP length of each time slot has two kinds of configurations, and for the 1.25M bandwidth, sample rate is 1.92MHz, and a slot time length is 675 μ s, and short CP is 14 sampling points, and long CP is 32 sampling points.And first reference signal (reference symbol) is arranged in first OFDM character position of time slot, and second reference signal is arranged in third from the bottom OFDM character position of time slot, and two reference symbols have relativity of time domain.Please refer to shown in Figure 5ly, it is the structural representation of TS0 time slot in the tdd frame structure.
R1 is first reference symbol among the figure, and R2 is second reference symbol.If the CP of TS0 partly is short CP, then first reference signal R1 position is 14-142, second reference signal R2 position 866-944, and the interval sampling point between two reference symbols is 852; Partly for long CP, then first reference signal R1 position is 32-160 as CP, and second reference signal R2 position is 832-960, and the interval sampling point between two reference symbols is 800.As seen, under different CP length, first reference symbol and the interval difference between second reference symbol with relativity of time domain can reach 52 sampling points, and such difference can produce significant difference for the difference correlation computations.
The CP configuration mode of at first supposing the TS0 time slot is short CP.
According to the SCH character position that step 110 obtains, can calculate the position of first reference symbol R1 and second reference symbol R2, be designated as P respectively
s 1And P
s 2, wherein,
And then calculate short CP hypothesis down, the difference correlation V of two row reference symbols in the receiving data sequence
1:
Wherein, N is an OFDM symbol FFT partial-length, is 128 herein; { r
iIt is receiving data sequence;
Secondly, suppose that the CP configuration mode of TS0 time slot is long CP.
According to the SCH character position that step 110 obtains, can calculate the position of first reference symbol R1 and second reference symbol R2, be designated as P respectively
l 1And P
l 2, wherein,
And then calculate long CP hypothesis down, the difference correlation V of two row reference symbols in the receiving data sequence
2:
Wherein N is an OFDM symbol FFT partial-length, is 128 here; { r
iIt is receiving data sequence;
Execution mode by reference symbol in the above-mentioned evolution TD-SCDMA TS0 of the system time slot as can be seen, CP length has several types, just can correspondence calculate several difference correlations.Here only be to be example, have in the time slot of equal conditions (having time domain or frequency domain correlation between reference symbol), also can adopt same procedure to handle for other with the TS0 time slot.Need explanation, the CP length of different system or standard-required and the timing relationship between reference symbol and the synchronization channel symbols may be not quite similar, but the principle of using technical solution of the present invention is identical, believes that those skilled in the art can analogize by the description of above-mentioned embodiment.
Step 130: more above-mentioned each difference correlation, the circulating prefix-length of maximum difference correlation correspondence is true.
In step 120, carry out the hypothesis of various CP length and handled, thereby obtained a plurality of difference correlations.The difference correlation calculates according to receiving data sequence, and the reference symbol position that has correlation in the receiving sequence is fixed, in other words, having only the location of reference symbol in a kind of hypothesis is accurately, and then the difference correlation maximum that calculates.Therefore can find out maximum difference correlation by comparing each difference correlation, the hypothesis of its correspondence is really set up.Length of the cycle in this hypothesis is true, is the length of the cycle of the actual employing of receiving data sequence; And then the reference symbol position that calculates in this hypothesis for true, is the physical location of reference symbol in the receiving data sequence also.
Specific to the example of aforementioned TS0 time slot, be exactly to compare V
1And V
2, the corresponding hypothesis of expression bigger among both is correct.That is, as V
1＞V
2, supposing that 1 sets up, TS0 uses short CP; As V
1＜V
2, supposing that 2 set up, TS0 uses long CP, can obtain the physical location (timing information of reference signal) of two reference symbols simultaneously.After this, just can utilize among the TS0 that obtains reference symbol to carry out that frequency deviation is smart synchronously, integer is adjusted by frequency deviation and time domain is smartly adjusted synchronously, sub-district ID number differentiates and read CBCH BCH information releasing, promptly finish the cell initial search process of whole evolution TD-SCDMA system.
Preferably, step 140: read the time slot circulating prefix-length information that other are not known by broadcast channel.
Suppose how UE, know it also is an important technical problem for the CP length of these six business time-slots of TS1-TS6 so if having obtained the CP length information of TS0 time slot by the invention described above technical scheme.If CP length is provided with identically in above-mentioned six business time-slots and the TS0 time slot, so apparent described six business time-slot CP length also are equivalent to know; But in a radio frames, the CP length of each business time-slot can be different, and such as having only the TS2 descending time slot to be assigned with as the multicast service time slot, the part of the CP among the TS2 should be selected long CP for use so, and all the other time slots adopt short CP.
For this reason, technical solution of the present invention gives the acquisition methods of unknown time slot CP length, and promptly the time slot CP length information for the unknown can obtain by the information that reads on the broadcast channel.Particularly, the CP length of each business time-slot is described by system in the broadcast channel BCH of sub-district, UE is after the essence of carrying out time and frequency by the reference symbol of TS0 time slot is synchronous, just can receive broadcast channel BCH information releasing accurately, and then obtain unknown time slot CP length information (as TS1-TS6), and the position of calculating reference signal in the corresponding time slot in view of the above.
In addition, for the TS0 time slot, it is mainly used in theaomni-directional transmission in the sub-district, can not carry multicast service in TS0, only just disposes long CP among the TS0 under the very big situation of radius of society; And for ascending time slot, do not have the demand of multicast service, and as seen the same with the TS0 time slot, only under the very big situation of radius of society, just dispose long CP.Therefore, just can judge the CP length information of ascending time slot, can further reduce the amount of information of BCH broadcasting like this, save system resource as long as know the CP length information of TS0 time slot.
The invention also discloses a kind of deriving means of circulating prefix-length information, see also Fig. 6, it is the structural representation of circulating prefix-length information deriving means.Described device comprises thick lock unit 11, pre-known information unit 12, supposes processing unit 13 and comparing unit 16.Preferably, also comprise smart lock unit 14 and broadcast channel BCH reading unit 15.Operation principle below in conjunction with this device is further introduced its internal structure.
At first, the thick lock unit 11 of described device obtains the character position of synchronous channel SCH according to receiving data sequence.The concrete reality of thick lock unit 11 has multiple, and for example relevant thick synchronous or the like the character position that can know SCH of thick synchronous searching of time domain or difference because this unit internal structure can be achieved by known technology, therefore no longer describes in detail.
Second, thick lock unit 11 sends to hypothesis processing unit 13 with SCH character position information, be used for character position and pre-known information unit 12, the difference correlation of estimating under the different circulating prefix-lengths, having two row reference symbols of correlation according to described synchronizing channel.Suppose that processing unit 13 specifically comprises locator unit 131 and difference correlation value calculation subelement 132.Locator unit 131 not only obtains SCH character position information from thick lock unit 11, also obtains the pre-known information that subsequent treatment needs from pre-known information unit 12.Described pre-known information comprises the timing relationship between dissimilar circulating prefix-lengths and reference symbol and the synchronization channel symbols, why say that dissimilar cyclic prefix CP length is the information that can predict, be because CP length kind can be not too many in present various communication systems, and the timing relationship between reference symbol and the synchronization channel symbols is normally by standard code, so UE also can predict above-mentioned information.
The information that locator unit 131 provides according to synchronization channel symbols position and pre-known information unit, the position of calculating under the different circulating prefix-lengths, having two row reference symbols of correlation.Then the reference symbol positional information that calculates is sent to difference correlation value calculation subelement 132, it calculates the difference correlation of reference symbol in the receiving data sequence according to described reference symbol position.As can be seen, suppose different circulating prefix-lengths, can obtain different reference symbol positions and corresponding difference correlation, in other words, several CP length of precognition are supposed, will obtain several different difference correlations.Fix owing to have the reference symbol position of correlation in the actual reception data sequence, therefore having only a kind of hypothesis is accurately.
At last, by comparing unit 16 each difference correlation is compared, the hypothesis of maximum related value correspondence is really set up, and the length of the cycle in this hypothesis is true, is the length of the cycle of the actual employing of receiving data sequence; And then the reference symbol position that calculates in this hypothesis for true, is the physical location of reference symbol in the receiving data sequence also.For detail, can be referring to the example of preamble TS0 time slot, this place repeats no more.So far, described device just can parse the CP length of the corresponding time slot of receiving data sequence.
But in a radio frames, the CP length of each business time-slot can be different.In this case, can finish obtaining of unknown time slot CP length by preferred smart lock unit 14 and BCH reading unit 15.Particularly, the true reference symbol after smart lock unit 14 is confirmed according to comparing unit 16 carry out essence synchronously, follow-up cell initial search processing such as integer is adjusted by frequency deviation and time domain is smartly adjusted synchronously, sub-district ID number differentiates.Pass through the unknown time slot CP length information of BCH reading unit 15 reading system broadcast channels issue then.If the CP length configuration of all time slots employings is identical certainly, just need not the cooperation of smart lock unit 14 and BCH reading unit 15, can know the CP length of whole time slots.For example, know the CP length of TS0 time slot after, under the CP length and TS0 same case of these six business time-slots of TS1-TS6, the CP length of these six business time-slots also is equivalent to know.
Need explanation, though technical solution of the present invention can not be applicable to that based on existing circulating prefix-length information acquisition methods evolution TD-SCDMA system cell just searches process and study formation, but the present invention program's range of application is not limited to evolution TD-SCDMA system, is suitable for too for other associated communication systems.
More than the acquisition methods and the device of circulating prefix-length information provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (8)
1, a kind of acquisition methods of circulating prefix-length information is characterized in that:
According to receiving data sequence, obtain the character position of synchronizing channel;
According to the character position and the pre-known information of described synchronizing channel, the position of calculating under the different circulating prefix-lengths, having two row reference symbols of correlation; According to described reference symbol position, calculate the difference correlation of reference symbol in the receiving data sequence; Wherein, described pre-known information comprises dissimilar circulating prefix-lengths, and the timing relationship between reference symbol and the synchronization channel symbols;
More above-mentioned each difference correlation serves as true with the circulating prefix-length of maximum difference correlation correspondence.
2, the acquisition methods of circulating prefix-length information as claimed in claim 1 is characterized in that, also comprises: read the time slot circulating prefix-length information that other are not known by broadcast channel.
3, the acquisition methods of circulating prefix-length information as claimed in claim 1 is characterized in that, described maximum difference correlation corresponding reference character position is the physical location of reference symbol in the described receiving data sequence.
As the acquisition methods of any described circulating prefix-length information in the claim 1 to 3, it is characterized in that 4, described two row reference symbols with correlation belong to the TS0 time slot.
As the acquisition methods of any described circulating prefix-length information in the claim 1 to 3, it is characterized in that 5, described correlation is a relativity of time domain.
6, a kind of deriving means of circulating prefix-length information is characterized in that comprising:
Thick lock unit is used for according to receiving data sequence, obtains the character position of synchronizing channel;
Suppose processing unit, be used for character position and pre-known information, the position of calculating under the different circulating prefix-lengths, having two row reference symbols of correlation according to described synchronizing channel; According to described reference symbol position, calculate the difference correlation of reference symbol in the receiving data sequence; Wherein, described pre-known information comprises dissimilar circulating prefix-lengths, and the timing relationship between reference symbol and the synchronization channel symbols;
Comparing unit is used for each difference correlation that more described hypothesis processing unit draws, and the circulating prefix-length of maximum difference correlation correspondence is true.
7, the deriving means of circulating prefix-length information as claimed in claim 6 is characterized in that, also comprises:
The broadcast channel reading unit is used for reading the time slot circulating prefix-length information that other are not known by broadcast channel.
As the deriving means of claim 6 or 7 described circulating prefix-length informations, it is characterized in that 8, described two row reference symbols belong to the TS0 time slot, have relativity of time domain between them.
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