CN1330114C - Method and apparatus for frame synchronization of WCDMA system - Google Patents
Method and apparatus for frame synchronization of WCDMA system Download PDFInfo
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- CN1330114C CN1330114C CNB2004100628144A CN200410062814A CN1330114C CN 1330114 C CN1330114 C CN 1330114C CN B2004100628144 A CNB2004100628144 A CN B2004100628144A CN 200410062814 A CN200410062814 A CN 200410062814A CN 1330114 C CN1330114 C CN 1330114C
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Abstract
A method for performing frame synchronization in a WCDMA system includes first, correlating a received signal with a plurality of predetermined correlators to obtain a plurality of frame synchronization correlation results, then, coherently combining frame synchronization correlation results with a slot synchronization phase when a test phase difference is less than a threshold phase difference, or, coherently combining frame synchronization correlation results with a linear combination of slot synchronization phases when the test phase difference is greater than or equal to the threshold phase difference. The slot synchronization phase is determined by correlating the received signal with a slot synchronization sequence. Lastly, the method determines a frame boundary of the received signal based on the coherent combination results. The method accommodates for a changing signal to noise ratio to improve frame synchronization speed and accuracy.
Description
Technical field
The present invention relates to a kind ofly be used for Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division MultipleAccess, WCDMA) communications zone in the system (Cell) method for searching particularly relates to a kind of frame synchornization method that is used for broadband CDMA system.
Background technology
The importance of spread-spectrum communication system in beehive network system grows with each passing day, and particularly when broadband CDMA system was business-like gradually, this system had more the market potential of remarkable lifting usefulness and reliability.
In order to set up network connections in broadband CDMA system, (User Equipment UE) at first will carry out the communications zone searching procedure to subscriber equipment.This communications zone search utility makes subscriber equipment realize the synchronous of sequential and coding with following chain frequency range (Downlink Channel).Known in known technology have many diverse ways to carry out the communications zone searching procedure.The part that known technology has disclosed, as publish in No. 8 (in August, 2000 version) (Vol.18 of international motor electronic engineering communication field periodical the 18th volume, No.8 (August 2000 edition) of IEEE Journal on Selected Areas inCommunications) in " CellSearch in W-CDMA " literary composition of being delivered by Yi-Pin Eric Wang and Tony Ottosson narration is arranged promptly, and quoted as proof by the application.
Then will do a briefly narration to the communications zone searching method.Please refer to Fig. 1, Fig. 1 is the public control frequency range of a following chain (Common Control Channel, CCH) 10 the calcspar in broadband CDMA system.Public control frequency range 10 may be partitioned into a succession of frame 12.Each frame 12 comprises 15 time slots (Slot) 14.Each time slot 14 has 10 symbols, and wherein each symbol has 256 substrates (chip) again.Therefore, each time slot is the length of 2560 substrates.Please in the lump with reference to Fig. 2 and Fig. 1, Fig. 2 is the calcspar of a time slot 14 in public control frequency range 10.Wherein first symbol 16 in each time slot 14 has main frequency range (Primary Synchronization Channel, PSCH) 16p and less important synchronizing band section (Secondary Synchronization Channel, a SSCH) 16s synchronously.All the other 18 of nine symbols be connected on become after first symbol 16 main public controlled entity frequency range (Primary Common Control Physical Channel, P-CCPCH).Main frequency range 16p and less important synchronous frequency range 16s mutually orthogonal synchronously, thereby superposition transmission mutually.(Primary Synchronization Code's main frequency range 16p synchronously PSC) is encoded, and this coding can not change by the main synchronous code identical with all base stations.Less important synchronous frequency range 16s is formed by 15 modulation code sequences that repeat to transmit, and wherein the length of each modulation code is 256 substrates.What these 15 modulation codes claimed is that (Secondary Synchronization Codes SSC), transmits in the mode parallel with main frequency range synchronously secondary synchronization code.Each secondary synchronization code is selected from one and is comprised 16 different sign indicating numbers and each yard is in the set of 256 substrate length.The sequence of less important synchronous frequency range is represented the code group group under the chain scrambler under the communications zone (Scrambling Code).Please refer to Fig. 3, Fig. 3 is a public guiding frequency range (Common Pilot Channel, CPICH) 20 calcspars of together propagating with public control frequency range 10.Public guiding frequency range 20 employed being encoded to are propagated the special use of base station institute.In a broadband CDMA system, a base station can be selected one and is used for public guiding frequency range 20 in 512 different main scramblers, these 512 main scramblers by 8 in 64 code group groups and each the code group group separately independently sign indicating number institute formed.Main synchronous code among the main frequency range 16p synchronously is public by all base stations, also therefore can be used for the synchronous of time slot 14.Though the secondary synchronization code of less important synchronous frequency range 16s can change along with the substrate of time slot 14 on time slot 14, the sequence pattern of the code change of less important synchronous frequency range 16s (pattern) still depends on the coding that is used for public guiding frequency range 20 in the code group group.That is less important synchronous frequency range 16s has 64 coded sequence patterns to adopt, and each coded sequence pattern is corresponding to a special code group that uses coding to combine with public guiding channel 20.By the be cross-linked with each other computing (Correlating) and find out maximum crosslinked value (Maximum Correlation Value) of the coded sequence of the public control access channel signal that will receive 10 and all possible less important synchronization channels 16s, can draw the code group group of common pilots channel 20, and achieve frame 12 is synchronous.Because less important synchronous frequency range 16s changes according to a predefined sequence, the sequence of beginning is all beginning known and that be placed in each frame 12 and partly transmits, but therefore achieve frame is synchronous.When the code group group of public guiding frequency range 20 when being known, can obtain the used main scrambler of communications zone by the relevance of calculating being used for discerning between per 8 signals of code group group of public guiding frequency range 20.And when the used main scrambler in base station was identified, (Broadcast Channel, BCH) message can be read the particular propagation frequency range between system and the communications zone.
According to the above, the communications zone method for searching is generally divided into following three steps:
Step 1: time slot is synchronous
It is synchronous to utilize main frequency range 16p synchronously to carry out time slot.Usually by the coupling between a matched filter (Matched Filter) or similar devices is realized and all base stations the are public main synchronous code.Generally speaking, useful time slot is the combination of non-link up (Non-coherently) after the output of matched filter in frame, therefrom find a peak-peak after, obtain the length range of this time slot again according to this peak-peak.
Step 2: frame synchronization and the identification of code group group
Be used to less important synchronous frequency range 16s and all possible secondary synchronization code is made correlation at the time slot length that step 1 drew.Form sign indicating number sequence from secondary synchronization code 1 to secondary synchronization code 16 with 16 secondary synchronization code.The value of all time slots is made correlation and is accumulated all possible frame scope and produce a numerical tabular in these secondary synchronization code and the frame.Each value in the table is represented the scope of scrambler group and frame time slot with the ranks position at its place in this table.Value maximum in the table is chosen as the candidate value that can determine frame scope and code group group.
Step 3: scrambler identification
In public guiding frequency range 20, carry out correlation between signal and signal to be implemented in the affirmation of scrambler and code group group in the step 2.Maximum crosslinked value be chosen as this base station main scrambler.And only in the crosslinked value of maximum during greater than critical value, the crosslinked value of this maximum just can be accepted.
See also Fig. 4, Fig. 4 is the calcspar that becomes known for the synchronous subscriber equipment of communications zone 30, and for ease of explanation, the composition assembly of subscriber equipment 30 reality of the present invention does not show in Fig. 4 fully, only shows necessary assembly.Subscriber equipment 30 comprises a transceiver 39 and a synchronizer 38.Transceiver 39 receives from the propagation signal of base station (figure does not show) and with the technology of similar known wireless module propagation data is sent to synchronizer 38.Synchronizer 38 comprises the first order 31, the second level 32 and the third level 33.It is synchronous that the first order 31 is used for carrying out the time slot of above-mentioned steps 1.The result that the first order 31 is produced is sent to the second level 32 with the 12 synchronous and code group group identifications of the frame in the execution in step 2.The result that the second level 32 is produced then is sent to the scrambler identification that the third level 33 goes execution in step 3.
The first order 31 comprises a peak value register (Peak Profiler) 34.Peak value register 34 comprises the main synchronous code 35 identical with all base stations, and compare main synchronous code 35 producing peak value record data 36 by the main frequency range 16p synchronously that foundation transceiver 39 is received, this peak value is by on the non-frame 12 that is incorporated into time slot 14 consistently.Peak value record data 36 will keep the data in the substrate of predetermined number, and as main synchronous frequency range 16p during in each time slot 14 repetition, will possess the data of a complete time slot 14 of enough coverings jointly, be 2560 substrates.In the substrate of record peak value record data 36, the substrate with a peak-peak is used for the main frequency range 16p synchronously of mark, and therefore is used as time slot scope side-play amount 37.As shown in Figure 5, Fig. 5 is the example figure (not display scale) of peak value record data 36.The first order 31 one of mark in peak value record data 36 comes across the peak-peak of No. 1658 substrate.Time slot scope side-play amount 37 thereby have a numerical value that is used to indicate the peak value path that is positioned at No. 1658 substrate.Time slot scope side-play amount 37 is sent to the second level 32 as time slot 14 synchronous points.Utilize time slot 14 positions of 37 marks of time slot scope side-play amount, the second level 32 is carried out above-mentioned steps 2 and is produced a code group group 32g and time slot numbering 32s.
The second level 32 has a correlation unit 32c and produces a crosslinked value table 32t with the crosslinked value according to time slot scope side-play amount 37 and less important synchronous frequency range 16s and secondary synchronization code gained.Correlation unit 32c comprises the correlation device of 16 secondary synchronization code.Suppose that α 0～α 15 is the output valve (time slot rate) of 16 less important synchronous frequency range correlation devices.Table c below in Fig. 6 is the allocation list of secondary synchronization code in less important synchronous frequency range, can be used for tabling look-up.The table w on the right is used to note down the accumulation result of 15 time slots.Following step will know how description determines frame scope and code group group:
for?slot＝0∶14
for?group＝0∶63
for?shift＝0∶14
w(group，shift)+＝α(c(group，(shift+slot)mod15))
next?shift
next?group
next?slot
This maximum is corresponding to a code group group and time slot numbering.This corresponding time slot numbering 32s is the difference on time slot quantity and present time slot border, also can obtain the border of this frame.This corresponding code group group 32g is the group number that is used for this scrambler of present communications zone.
The third level 33 also comprises a correlation unit 33c, and it is used for that public guiding frequency range 20 is comprised all possible main scrambler with code group group 32g and makes correlation.By the method, correlation 33r as a result can be by obtaining respectively in the main scrambler.The main scrambler that has only corresponding crosslinked value to surpass critical value 33x and have a maximum crosslinked value can be chosen as main scrambler 33p.For instance, if each code group group comprises 8 main scrambler S0-S7, its main crosslinked value 33r is: C0, C1, C2, C3, C4, C5, C6, C7 are respectively the main crosslinked value to S7 by 8 main scrambler S0 in the indicated code group group of code group group # 32g.Suppose that C6 has the highest main crosslinked value and surpasses critical value 33x, then the third level 33 promptly can be made as " 6 " with the value of main scrambler numbering 33p.
Traditionally, the main phase estimation value of frequency range synchronously in the second level 32 is that contrast correlation unit 32c is when carrying out the combinatorial operation that links up and the crosslinked value table 32t that produces.Also be, the phase place correction value that is used for less important synchronous frequency range 16s signal is according to the corresponding main phase difference of frequency range 16p signal synchronously, because less important synchronous frequency range is to transmit to be parallel mode with main frequency range synchronously in each time slot 14, and mainly frequency range is as the same synchronously, and Here it is, and why we can use the reason of the phase reference value that gets from the estimation of main frequency range synchronously.(Signal toNoise Ratio, under situation SNR), and when the situation of low signal-to-noise ratio, the usefulness of correlation unit 32c can reduce the method applicable to high s/n ratio.Therefore, do not consider the variation of noise with reference to the phase place of main frequency range synchronously, will cause slower frame synchronization time and slower communications zone search.
Summary of the invention
Therefore but main purpose of the present invention provides the frame synchornization method of a reducing noise influence and relevant apparatus to solve the above problems.
The invention provides a kind of method that realizes to receive the frame synchronization of signal, receive signal and can be divided into a plurality of frames, each frame comprises a plurality of time slots, and the step that this method comprises has: with a plurality of default these reception signals of correlation device correlation to obtain the crosslinked value of a plurality of frame synchronization; When it is that the test phase difference of root-mean-square deviation of time slot locking phase of a predetermined number is during less than the critical phase potential difference that determined according to an expection signal to noise ratio scope that receives signal, the crosslinked value of frame synchronization is combined consistently with a time slot locking phase, and the time slot locking phase is done correlation and is decided by receiving a signal and a time slot synchronizing sequence; When test phase difference during more than or equal to the critical phase potential difference, associated value is consistently done in the linear combination of crosslinked value of frame synchronization and time slot locking phase, and wherein this linear combination mean value of calculating the phase difference between time slot locking phase at that time and time slot locking phase that at least one is previous and trying to achieve this time slot phase difference obtains; And; And decide the frame boundaries of accepting signal according to coherent associated value.
The present invention also provides a kind of wireless device, and it comprises: a receiver, and in order to receive a signal, this signal has a plurality of frames, and wherein each frame has a plurality of time slots; One first order is in order to obtain the time slot locking phase of this reception signal; A plurality of correlation devices are in order to export the crosslinked value of a plurality of frame synchronization of this reception signal; One colligator, in order to being that the test phase difference of root-mean-square deviation of time slot locking phase of a predetermined number is during less than the critical phase potential difference that determined according to an expection signal to noise ratio scope that receives signal at it, the crosslinked value of this frame synchronization done consistently with a time slot locking phase combine, and when this test phase difference during more than or equal to this critical phase potential difference, then the crosslinked value of this frame synchronization is done consistently combining with a linear combination of this time slot locking phase, wherein this linear combination mean value of calculating the phase difference between time slot locking phase at that time and time slot locking phase that at least one is previous and trying to achieve this time slot phase difference obtains; And a selected cell, in order to select a frame boundaries value according to the output of this colligator.
Another object of the present invention is by crosslinked value of combinatorial operation frame synchronization and the synchronous linear combination of time slot consistently, can reduce high signal The noise.
A further object of the present invention is that selectable critical value can make frame synchronization and corresponding code group group selection optimization.
Description of drawings
Fig. 1 is the calcspar of the public control frequency range of following chain in the broadband CDMA system.
Fig. 2 is a time slot calcspar in the public control frequency range shown in Figure 1.
Fig. 3 is the calcspar that the public control frequency range among a public guiding frequency range and Fig. 1 is together propagated.
Fig. 4 is the calcspar that becomes known for the synchronous subscriber equipment of communications zone
Fig. 5 is the example figure of the record of subscriber equipment peak value shown in Fig. 4 data.
Fig. 6 is the crosslinked value figure shown in Fig. 4.
Fig. 7 is the calcspar of subscriber equipment of the present invention.
Fig. 8 is the calcspar of second level circuit among Fig. 7.
Fig. 9 is decision mean value and root-mean-square deviation (Mean SquareError, flow chart MSE) among first embodiment.
Figure 10 is the flow chart of communications zone method for searching among the present invention.
Figure 11 is the second embodiment of the present invention, in order to the flow chart of decision mean value and root-mean-square deviation.
Figure 12 and Figure 13 are the PHASE DISTRIBUTION areal map of method shown in Figure 11.
The reference numeral explanation
14 main public controlled entity frequency ranges
16 symbols
The main frequency range synchronously of 16p
The less important synchronous frequency range of 16s
18 symbols
20 public guiding frequency ranges
30 subscriber equipmenies
31 first order
32 second level
32c correlation unit
32g code group group
32s time slot numbering
The crosslinked value table of 32t
33 third level
33c correlation unit
The main scrambler of 33p
The crosslinked value of 33r
The 33x critical value
34 peak value registers
The 34m matched filter
34s SRRC
35 main synchronous codes
36 peak values record data
37 main frequency range path positions (time slot scope side-play amount) synchronously
38 synchronizers
39 transceivers
100 subscriber equipmenies
101 transceivers
110 first order
120 second level
122 receive signal
124 code group groups
130 third level
132 main correlation devices
The less important correlation device of 134a
The less important correlation device of 134b
The less important correlation device of 134k
140 colligators
142 simple average processors
144 conjugate complex number processors
145 decision logic devices
150 selected cells
152 accumulators
154 controllers
156 CFRS unit
158 internal memories
160 selectors
Embodiment
See also Fig. 7, Fig. 7 is the calcspar of subscriber equipment 100 of the present invention.Though in Fig. 7, do not show detailed composition assembly, but these different assembly functions can utilize a CPU (Central Processing Unit in the subscriber equipment 100, CPU) carry out suitable program code to realize method of the present invention, below detailed implementation method will be described.Existingly in the known technology carry out the searching procedure of communications zone by a CPU and corresponding program code, in the preferred embodiment of following detailed description the present invention can one suitable technology realized.In addition, also can be by some specific hardware to realize part or all of function of the present invention.In addition, these different functional units and data structure might not be according to the arrangements of each several part described in Fig. 7.
Subscriber equipment 100 of the present invention has many similar locating to the subscriber equipment 30 of known technology.Particularly subscriber equipment 100 all has a transceiver 101, a first order 110 and a third level 130 with subscriber equipment 30.And subscriber equipment 100 also comprises a second level 120 to carry out the method that frame synchronization of the present invention and communications zone are searched.
See also Fig. 8, Fig. 8 is the calcspar of the second level 120.The second level 120 comprises a plurality of correlation devices (Correlator) 130, a colligator (Combiner) 140 and a selected cell 150.A plurality of correlation devices 130 comprise one corresponding to the correlation device 132 of main frequency range time slot sync signal synchronously and correlation device 134a-p corresponding to 16 less important (frame) synchronous codes.The output signal 122 of the first order 110 inputs among correlation device 132, the 134a-p, and each correlation device 132,134a-p are all exported crosslinked a value in the colligator 140.
Colligator 140 comprises a simple average, and (Simple Average, SA) processor 142 mean value, a decision logic device 145, the conjugation plural number processor 144 that are used to calculate the output of correlation device 132 is used to obtain the correlation value combination consistently that the conjugate complex number of decision logic device 145 output valves and a plurality of multiplier 146 are used for frame synchronization that correlation device 134a-p is obtained with the estimation phase place of correlation device 132 gained.Specifically, simple average processor 142 receives and handles by the output that restriction produced of correlation device 132 according to decision logic device 145 with conjugate complex number processor 144, and then the value that will handle outputs to each multiplier 146.Comprise critical value according to root-mean-square deviation via the processing procedure of decision logic device 145 and decide with main (time slot) locking phase or the linear combination of main (time slot) locking phase as output valve, this part will be described in detail after a while again.In addition, simple average processor 142, decision logic device 145 and conjugate complex number processor 144 can do according to Specialty Design person's design requirement rearrange, in conjunction with or the configuration that separates.Each less important correlation device 134a-p exports a crosslinked multiplier 146 that is worth a correspondence, and then multiplier 146 combines the crosslinked value of frame synchronization consistently with the output valve of conjugate complex number processor 144.The output valve of multiplier 146 is linked to selected cell 150.
Selected cell 150 comprises a plurality of accumulators (Accumulator) 152, wherein each accumulator 152 is connected to a corresponding multiplier 146, a controller 154, one no space code Li De-Saloman coding unit (Comma-Free Reed-Solomon Unit, CFRS Unit) 156, one internal memory 158 and a selector 160.The crosslinked value table 32t that accumulator 152, controller 154, CFRS unit 156 and internal memory 158 produce as shown in Figure 6.Particularly, these assemblies add up and tabular goes out to represent the crosslinked value W of the code group group sequence of less important synchronous frequency range 16s (as shown in Figure 2)
X, xAfter table 32t produced, selector 160 then therefrom selected maximum with decision frame boundaries and code group group.In fact selected cell 150 is the selection circuit of a frame boundaries and code group group, and it can determine and export the code group group 124 that receives signal 122.
Generally speaking, the function mode of second level circuit 120 is as described below.Main correlation device 132 is exported the crosslinked value of a plurality of frame synchronization with less important correlation device 134a-p and is given colligator 140.Decision logic device 145 judges that the crosslinked value of frame synchronization of less important correlation device 134a-p output will combine consistently with the time slot locking phase output valve of main correlation device 132, or combines consistently with the linear combination of at that time time slot locking phase place value and received before time slot locking phase place value.In order to improve the possibility that obtains correct code group group 124, the standard of judgement is according to deciding with received before time slot locking phase place value and a root-mean-square deviation of selected critical value especially at that time.
The 142 performed computings of simple average processor are according to following equation (1), equation (2) and equation (3):
Δ P (n)=P (n)-P (n-1) equation (1)
Wherein Δ P (n) is the phase difference of gained after the time slot computing,
P (n) is the locking phase of time slot at that time,
P (n-1) is the locking phase of previous time slot.
In a preferred embodiment, a frame of being made up of 15 time slots has 14 corresponding differences.It is noted that the object of the invention is synchronous at achieve frame, the processing of these 15 time slots not must corresponding to an independent frame-as long as time slot continuously.The mean value of these time slots calculates in the following manner:
Root-mean-square deviation (MSE) is calculated according to following manner:
Equation (1), equation (2) are to be carried out by decision logic device 145 with equation (3).After carrying out these calculating, decision logic device 145 will calculate the Δ P of gained
MSEThe worthwhile critical value of doing, this critical value decides according to the signal to noise ratio of received signal.But critical value can at any time be set to the arbitrary value of optimization computing of the present invention.For instance, for first mobile phone, this critical value can be set to a fixed value according to experiment value or classification when dispatching from the factory.Yet concerning second mobile phone, its critical value can constantly change its set point according to real-time snr measurement computing by the system of this phone.Can certainly use the combination of above two kinds of methods, or other has the method for effect same.
See also Fig. 9, Fig. 9 is decision mean value and root-mean-square deviation (Mean SquareError, flow chart MSE) among first embodiment.Details are as follows in the calculating of this mean value and root-mean-square deviation:
Step 300: beginning;
Step 302: the signal and the main signal of frequency range synchronously that receive are done correlation to obtain received at that time time slot locking phase P (n).This computing is to be carried out by correlation device 132 shown in Figure 8;
Step 304: calculate locking phase P of time slot (n) and previous time slot locking phase P (n-1) phase difference between the two that receives at that time according to equation (1).This step is all carried out by decision logic device 145 shown in Figure 8 with step subsequently;
Step 306: judge whether time slot at that time is the 14th (at last by the time slot of computing).If necessary, then continue next time slot is judged;
Step 308: select next time slot;
Step 310: calculate Δ P according to equation (2) and equation (3)
MEANWith Δ P
MSEValue;
Step 312: finish.
In above program, Δ P
MEANWith Δ P
MSEThe calculating of value may repeatedly be carried out between the time slot that replaces.Specifically, this a succession of value can be used for finding out mean value and root-mean-square deviation.
Please refer to flow chart shown in Figure 10, below will be described in detail circuit 120 all operation workflows in the second level of the present invention among Fig. 8:
Step 400: beginning;
Step 402: it is synchronous to carry out time slot by the first order shown in Figure 7 110;
Step 404: with correlation device 132, the received signal of 134a-p correlation.Utilize main correlation device 132 that received signal and main frequency range signal are synchronously done correlation to obtain time slot locking phase P (n).Utilize 16 less important correlation device 134a-p that received signal and less important synchronous frequency range signal are done correlation;
Step 406: judge the main average time slot locking phase difference Δ P of frequency range synchronously
MEANPhase difference P with previous frame (15) time slot
MSEThe root-mean-square deviation of value.This step can be realized by program shown in Figure 9.Then, check these phase difference P
MSEWhether the root mean square difference of value is more than or equal to critical value P
TIf, then carry out step 408, if not, then carry out step 410.As shown in Figure 8, this step is to carry out computing according to equation (1), equation (2) with equation (3) by decision logic device 145;
Step 408: utilize the multiplier 146 will be by the crosslinked value of frame synchronization of less important correlation device 134a-p gained and the average time slot locking phase difference Δ P that is produced by conjugate complex number processor 144
MEANValue is done combination consistently;
Step 410: utilize multiplier 146 to do with time slot locking phase P (n) value that is produced by conjugate complex number processor 144 and combine consistently by the crosslinked value of frame synchronization of less important correlation device 134a-p gained;
Step 412: utilize the accumulator 152 crosslinked value that adds up, and utilize controller 154, CFRS unit 156 to come tabular to go out to represent the less important crosslinked value W of the code group group sequence of less important synchronous frequency range 16s (as shown in Figure 2) with internal memory 158
X, x
Step 414: selector 160 is selected maximum tabulated value W
X, xDecide frame boundaries;
Step 416: the third level 130 is as shown in Figure 7 decided the code group group of the signal that receives according to fixed frame boundaries;
Step 418: finish.
For the present invention, the institute of said method is the most important with step 406 to 410 in steps.In addition, the comparative result in the step 406 depends on the definition of critical value and how to go to carry out the program that stores and compare on a device.That is to say that comparative result will be less than or similar in appearance to this estimated value.
Figure 11 is the second embodiment of the present invention, in order to the flow chart of the method for decision mean value and root-mean-square deviation.The method of second embodiment is that the time slot phase difference is modulated to two scopes and difference calculating mean value and root-mean-square deviation, and these two scopes are shown in Figure 12 and Figure 13.Select the pairing mean value of less root-mean-square deviation and further the calculating of the value of averaging and root-mean-square deviation repeatedly to improve accuracy rate.The determining method of mean value and root-mean-square deviation among second embodiment below will be described in detail in detail:
Step 500: beginning;
Step 502: mean value and the root-mean-square deviation of calculating the time slot phase difference in-π～π and two different range of 0-2 π according to equation (1), equation (2) and equation (3);
Step 504: select root mean square difference lower in the step 502 and with this root-mean-square deviation corresponding average.To be set at an initial average output value Δ P ' with lower root mean square difference corresponding average in the step 502
MEAN(0).In addition, m is counted in repetitive operation and be made as 0;
Step 506: utilize equation (4) to calculate repetition mean value;
Step 508: mean value and the root-mean-square deviation of calculating the time slot phase difference in-π～π scope according to equation (2), equation (3) and equation (5);
Step 510: check the limit whether arrive repetitive operation, also be, check that present repetitive operation counts the repeat number N whether m equals to preset,, otherwise carry out step 512 if then carry out step 514;
Step 512: carry out next repetitive operation, and the m value is counted in repetitive operation be made as m+1;
Step 514: finish.
Δ P ' (n)=Δ P (n)-Δ P
MEAN' equation (5)
As shown in Figure 12 and Figure 13, identical time slot locking phase place value may appear in different phase range.Above-mentioned method as shown in figure 11 can be offseted the uncertainty in the actual phase scope of time slot locking phase, and the correctness of output valve is improved.
Compared to known technology, the present invention is worthwhile work one critical value of the root-mean-square deviation of a plurality of time slot phase places, selects a corresponding time slot phase average then or according to the single time slot phase value of comparison operation gained.The setting of this critical value is discreet value or its measured value according to a signal to noise ratio.Therefore, in the environment that signal to noise ratio constantly changes, also can obtain accurate time slot easily and confirm with the search of corresponding code group group and realization communications zone synchronously.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (9)
1. signal method for synchronous is applicable to that to receive signal to one synchronous, and this reception signal has a plurality of frames, and each frame comprises a plurality of time slots, and this method comprises:
With a plurality of default these reception signals of correlation device correlation to obtain the crosslinked value of a plurality of frame synchronization;
When it is that the test phase difference of root-mean-square deviation of time slot locking phase of a predetermined number is during less than the critical phase potential difference that determined according to an expection signal to noise ratio scope that receives signal, the crosslinked value of this frame synchronization and a time slot locking phase are combined into the associated value that links up, and this time slot locking phase was done correlation and was decided by receiving a signal and a time slot synchronizing sequence;
When this test phase difference during more than or equal to this critical phase potential difference, one linear combination of the crosslinked value of this frame synchronization and this time slot locking phase is combined into the associated value that links up, and wherein this linear combination mean value of calculating the phase difference between time slot locking phase at that time and time slot locking phase that at least one is previous and trying to achieve this time slot phase difference obtains; And
Decide the frame boundaries of this reception signal according to this coherent associated value.
2. the method for claim 1, wherein a frame comprises 15 continuous time slots, and this mean value be come according to 14 time slot locking phase potential differences that calculated in these 15 continuous time slots average.
3. the method for claim 1, wherein the expection signal to noise ratio scope of this critical phase potential difference is when this signal to noise ratio during in high scope, the crosslinked value of this frame synchronization is to do consistently with this time slot locking phase to combine, and when this signal to noise ratio during in low scope, the crosslinked value of this frame synchronization is then done consistently with this linear combination and is combined.
4. the method for claim 1, wherein this frame boundaries is to be obtained by following steps:
The coherent associated value of time slot of a predetermined number adds up; And
Select the maximum in this coherent associated value to decide a frame boundaries and a corresponding code group group.
5. wireless device, it comprises:
One receiver, in order to receive a signal, this signal has a plurality of frames, and wherein each frame has a plurality of time slots;
One first order is in order to obtain the time slot locking phase of this reception signal;
A plurality of correlation devices are in order to export the crosslinked value of a plurality of frame synchronization of this reception signal;
One colligator, in order to being that the test phase difference of root-mean-square deviation of time slot locking phase of a predetermined number is during less than the critical phase potential difference that determined according to an expection signal to noise ratio scope that receives signal at it, the crosslinked value of this frame synchronization done consistently with a time slot locking phase combine, and when this test phase difference during more than or equal to this critical phase potential difference, then the crosslinked value of this frame synchronization is done consistently combining with a linear combination of this time slot locking phase, wherein this linear combination mean value of calculating the phase difference between time slot locking phase at that time and time slot locking phase that at least one is previous and trying to achieve this time slot phase difference obtains; And
One selected cell is in order to select a frame boundaries value according to the output of this colligator.
6. wireless device as claimed in claim 5, wherein this frame comprises 15 continuous time slots, and this mean value that this simple average processor is tried to achieve is to come on average according to 14 time slot locking phase potential differences that calculated in these 15 continuous time slots.
7. wireless device as claimed in claim 5, wherein to comprise a simple average processor poor to calculate this test phase for this colligator.
8. wireless device as claimed in claim 5, wherein this colligator can be used for setting this critical phase potential difference, when this signal to noise ratio during in high scope, the crosslinked value of this frame synchronization is to do consistently with this time slot locking phase to combine, and when this signal to noise ratio during in low scope, the crosslinked value of this frame synchronization is then done consistently with this linear combination and is combined.
9. wireless device as claimed in claim 5, wherein this selected cell comprises a plurality of accumulators, is used to add up by the output valve of this colligator according to the time slot of a predetermined number.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US46279403A | 2003-06-17 | 2003-06-17 | |
| US10/462,794 | 2003-06-17 | ||
| US10/707,663 US7254163B2 (en) | 2003-12-31 | 2003-12-31 | Method for WCDMA frame synchronization and related device |
| US10/707,663 | 2003-12-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1574704A CN1574704A (en) | 2005-02-02 |
| CN1330114C true CN1330114C (en) | 2007-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100628144A Expired - Fee Related CN1330114C (en) | 2003-06-17 | 2004-06-17 | Method and apparatus for frame synchronization of WCDMA system |
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| Country | Link |
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| CN (1) | CN1330114C (en) |
| TW (1) | TWI244277B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MY154923A (en) | 2006-11-01 | 2015-08-28 | Qualcomm Inc | Reference signal design for cell search in an orthogonal wireless communication system |
| TWI381672B (en) * | 2008-12-05 | 2013-01-01 | Nat Univ Chung Cheng | And a synchronizing means for synchronizing the communication means with the base station signal |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000201100A (en) * | 1999-01-07 | 2000-07-18 | Matsushita Electric Ind Co Ltd | Spread spectrum communication device |
| CN1279855A (en) * | 1997-11-19 | 2001-01-10 | 株式会社建伍 | Synchronization acquiring circuit |
| US6289064B1 (en) * | 1996-03-07 | 2001-09-11 | Matsushita Communication Industrial Co., Ltd. | Synchronization equipment |
| JP2001267966A (en) * | 2000-03-17 | 2001-09-28 | Matsushita Electric Ind Co Ltd | Synchronization acquisition device and synchronization acquisition method |
| EP1292063A1 (en) * | 2001-04-16 | 2003-03-12 | Matsushita Electric Industrial Co., Ltd. | Frame synchronization apparatus and frame synchronization method |
-
2004
- 2004-06-02 TW TW093115842A patent/TWI244277B/en not_active IP Right Cessation
- 2004-06-17 CN CNB2004100628144A patent/CN1330114C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6289064B1 (en) * | 1996-03-07 | 2001-09-11 | Matsushita Communication Industrial Co., Ltd. | Synchronization equipment |
| CN1279855A (en) * | 1997-11-19 | 2001-01-10 | 株式会社建伍 | Synchronization acquiring circuit |
| JP2000201100A (en) * | 1999-01-07 | 2000-07-18 | Matsushita Electric Ind Co Ltd | Spread spectrum communication device |
| JP2001267966A (en) * | 2000-03-17 | 2001-09-28 | Matsushita Electric Ind Co Ltd | Synchronization acquisition device and synchronization acquisition method |
| EP1292063A1 (en) * | 2001-04-16 | 2003-03-12 | Matsushita Electric Industrial Co., Ltd. | Frame synchronization apparatus and frame synchronization method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1574704A (en) | 2005-02-02 |
| TWI244277B (en) | 2005-11-21 |
| TW200501619A (en) | 2005-01-01 |
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