CN1820423A - Frame synchronization using soft decisions in universal mobile telephone system receiver - Google Patents
Frame synchronization using soft decisions in universal mobile telephone system receiver Download PDFInfo
- Publication number
- CN1820423A CN1820423A CNA03826871XA CN03826871A CN1820423A CN 1820423 A CN1820423 A CN 1820423A CN A03826871X A CNA03826871X A CN A03826871XA CN 03826871 A CN03826871 A CN 03826871A CN 1820423 A CN1820423 A CN 1820423A
- Authority
- CN
- China
- Prior art keywords
- correlator
- ssch
- metric
- symbol
- time slot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/70735—Code identification
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7075—Synchronisation aspects with code phase acquisition
- H04B1/708—Parallel implementation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7083—Cell search, e.g. using a three-step approach
Abstract
A Universal Mobile Telephone System (UMTS) receiver performs frame synchronization in accordance with a soft decision technique. Illustratively, the UMTS receiver first forms a matrix of correlation peak values (350) from at least one received frame, each row of the matrix representing a possible SSCH code and each column of the matrix representing a slot position of an SCH frame. The UMTS receiver then forms a metric (355) for each cyclic shift of each one of 64 possible scrambling code groups from the matrix of correlation peak values and identifies the metric with the highest value (360). Having identified the highest metric value (360), the UMTS receiver uses the scrambling code group (365) and offset associated thereto (370) to complete frame synchronization.
Description
Technical field
The present invention relates generally to radio receiver, more specifically, relate to for example universal mobile telephone system (UMTS), based on the subscriber equipment in the wireless system of spread spectrum (UE).
Background technology
Basic time unit in the UMTS radio signal is 10 milliseconds of (ms) radio frames, and it is divided into 15 time slots of each 2560 chip.(or base station) is " downstream signal " to the UMTS radio signal of UMTS receiver from the sub-district, and reverse radio signal is called as " upward signal ".When at first opening the UMTS receiver, the UMTS receiver is carried out " Cell searching " and is searched for the sub-district that will communicate with it.Particularly, and be described below, initial UMTS receiver is sought the descending synchronous signal channel (SCH) that sends from the sub-district, so as synchronous with it on time slot and frame grade, and the specific scramble codes group of definite sub-district.Only after the Cell searching of success, just can begin voice/data communications.
For Cell searching, SCH is a sparse downlink channel effective during preceding 256 chips of each time slot.SCH is become with time two groups of subchannels of SCH (SSCH) by main SCH (PSCH).For all sub-districts, PSCH 256 chip sequences or PSCH code all are identical in all time slots of SCH.On the contrary, SSCH 256 chip sequences or SSCH code can be different in each of 15 time slots of radio frame, and are used to discern one of 64 possible scrambler groups.In other words, each radio frame of SCH repeats to transmit the scrambler group sequence that the sub-district is associated with each.Each SSCH code is taken from the alphabet of 16 possibility SSCH codes.
As the part of Cell searching, the UMTS receiver at first uses PSCH to realize slot synchronization.In this, the UMTS receiver is correlated with known PSCH 256 chip sequences (all is identical for all time slots) to the sampling of reception that receives PSCH, according to the position of relevant peaks, determines the time slot reference time.When definite time slot during the reference time, the UMTS receiver is carried out slot synchronization, and the UMTS receiver can determine that each time slot is in the time started that receives in the radio frame.
After slot synchronization, the UMTS receiver stops processing and the beginning treatment S SCH of PSCH.Particularly, the UMTS receiver carries out relevant to the particular sequence that receives 15 SSCH codes in the radio frame and known sequence, synchronous with achieve frame, and the scrambler group of definite sub-district.Equally, the UMTS receiver must at first determine to receive 64 in may the scrambler group which, determines the number of time slot in estimation that the UTMS receiver frame begins and the actual frame side-play amount between beginning then, to obtain frame synchronization.Typical method is to use hard decision technique.For example, in each time slot, carry out relevant with 16 SSCH codes in the alphabet to received signal.The SSCH code that will have strong correlation is used for the estimation that receives the SSCH code of this time slot.Then, with resulting, across 15 SSCH codes of 15 time slots estimate with all 64 may the scrambler groups institute might 15 displacements compare, received scrambler group and definite frame shifting amount with identification.(in UMTS, pre-defined scrambler group sequence, so that its cyclic shift is unique, that is, the cyclic shift of any scrambler group sequence is all different with any other scrambler group sequence).So the sign of scrambler group makes the UMTS receiver carry out descrambling to all other down channels (for example Common Pilot Channel (CPICH)) of sub-district, so that the beginning voice/data communications.
Unfortunately, the SSCH of above-mentioned cell search process partly is a part the most consuming time.Particularly, because UMTS system possible operation is in low signal-to-noise ratio, the UMTS receiver is handled the radio frame of reception of predetermined number, and for example 10 to 20, so that obtain the good estimation of the sequence of 15 SSCH codes sending from the sub-district.Similarly, long because each radio frame is 10ms, the user may experience at least 100 delays to the 200ms order of magnitude before the beginning voice/data communications.
Summary of the invention
As mentioned above, the UMTS receiver is carried out the SSCH part of Cell searching by handling the radio frame of reception of predetermined number.Yet, can observe, because in case which SSCH code decision receives in particular time-slot, will abandon with other of this time slot and may receive the information that the SSCH code is associated, under abominable channel condition, in particular time-slot, use hard decision technique to determine to have received the deterioration that the SSCH code causes performance.For example, hard decision technique is selected the SSCH code be associated with maximum correlation peak.Equally, when one of received signal and 16 possibility SSCH codes are compared, if maximum correlation peak has numerical value 1025 and next maximum correlation peak (may be associated with correct SSCH code) has numerical value 1020, then abandon a back information (with correct SSCH code) that is associated with next maximum correlation peak.Equally, in some cases, especially when under abominable channel condition, operating, when being received, discerned wrong SSCH code by wireless receiver.
Therefore, according to principle of the present invention, a kind of wireless receiver receives synchronization character, and described synchronization character comprises a plurality of code words or the symbol based on a plurality of time slots, and wherein S symbol is associated with synchronization character from the set of M synchronization character, wherein S＞1 and M＞1; And by according to M synchronization character in each metric that is associated estimate the associated synchronisation word, obtain frame synchronization with respect to a plurality of time slots.
According to embodiments of the invention, the UMTS receiver is the part of UMTS subscriber equipment (UE), and comprises processor and relevant memory.Processor at first utilizes PSCH to carry out slot synchronization.After realizing slot synchronization, processor is by according at least one received frame, in relational storage, form matrix of correlation peak and carry out frame synchronization, each line display possibility SSCH code of described matrix, and the time slot position of SCH frame is shown in each tabulation of described matrix.Then, according to matrix of correlation peak, at 64 may scrambler each each cyclic shift in the group, processor form tolerance also identification have the tolerance of correlator peak values.When the identification correlator peak values, processor uses relative scrambler group and side-play amount to finish frame synchronization.
According to another embodiment of the invention, a kind of UMTS receiver is carried out frame synchronization according to soft decision method.Demonstration ground, UMTS receiver is at first according at least one formation matrix of correlation peak of received frame, and each line display of described matrix may SSCH code, and the time slot position of SCH frame is shown in each tabulation of described matrix.Then, at from matrix of correlation peak, 64 may scrambler each each cyclic shift in the group, the UMTS receiver form tolerance also identification have the tolerance of correlator peak values.When the identification correlator peak values, the UMTS receiver uses relative scrambler group and side-play amount to finish frame synchronization.
Description of drawings
Fig. 1 shows the part of illustrative wireless communications system in accordance with the principles of the present invention;
Fig. 2 and 3 shows the demonstration embodiment of wireless receiver in accordance with the principles of the present invention;
Fig. 4 shows illustrative flow chart in accordance with the principles of the present invention;
Fig. 5 shows the demonstration embodiment of correlator configuration in accordance with the principles of the present invention;
Fig. 6 shows the illustrative matrix structure that is used to store correlator value in accordance with the principles of the present invention;
Fig. 7 shows another illustrative flow chart in accordance with the principles of the present invention;
Fig. 8 shows illustrative metric matrix structure in accordance with the principles of the present invention;
Fig. 9,10 and 11 further shows the matrix of Fig. 6 and 8;
Figure 12 shows in accordance with the principles of the present invention, and illustrative pseudo code realizes; And
Figure 13 and 14 shows illustrative simulation results.
Embodiment
Except notion of the present invention, unit shown in the drawings is known, is not elaborated.In addition, suppose to know wireless communication system, and be not elaborated at this based on UMTS.For example, except notion of the present invention, spread spectrum transmission and reception, sub-district (base station), subscriber equipment (UE), down channel, up channel and RAKE receiver are known, do not describe at this.In addition, can use traditional programming technique to realize notion of the present invention, not describe at this equally.At last, the similar similar unit of numeral in the accompanying drawing.
The demonstration part of UMTS wireless communication system 10 in accordance with the principles of the present invention has been shown among Fig. 1.Sub-district (or base station) 15 broadcasting comprise descending synchronous signal channel (SCH) signal 16 of above-mentioned PSCH and SSCH subchannel.As mentioned above, (UE) is synchronous with SCH signal 16 by the UMTS subscriber equipment, as the prerequisite of voice/data communications.For example, UE is at " Cell searching " operating period treatment S CH signal.In this example, when for example opening or start shooting UE 20, for example cellular UE 20 starts Cell searchings.The purpose of cell search comprises that (a) determines the scrambler group of sub-district (for example the sub-district 15), and (b) on the time slot of UMTS radio frame and frame level synchronized cells send.As described below, and according to principle of the present invention, UE 20 uses soft decision technique to determine the scrambler group and obtain frame synchronization.It should be noted that, although in the context of following example based on search of initial zone (promptly when opening UE 20) notion of the present invention has been shown, notion of the present invention is not limited to this, but can be applicable to other example of Cell searching, for example when UE is in " idle pulley ".
Turn to Fig. 2 now, show the illustrative block diagram of the part of UE 20 in accordance with the principles of the present invention.UE 20 comprises front end 105, analog to digital (A/D) transducer 110, cell search unit 115, searcher unit 120, rake receiver 125, host interface block 130 and processor 135.Shall also be noted that except notion of the present invention, in piece shown in Figure 2, can also comprise other unit known in the field, yet not describe in order to simplify.For example, A/D converter 110 can comprise digital filter, buffer etc.
Turn to Fig. 3 now, show the illustrative block diagram of cell search unit 115.Cell search unit 115 comprises PSCH unit 205 and SSCH unit 210.Now also should be with reference to figure 4, Fig. 4 shows illustrative flow chart in accordance with the principles of the present invention, is used to utilize the cell search unit 115 of Fig. 3 to handle descending PSCH and SSCH subchannel.In step 305, the processor 135 of UE 20 starts Cell searching, by handling descending PSCH subchannel, attempts realizing slot synchronization in step 305.Particularly, processor 135 activates PSCH unit 205 via signaling 206, makes it receive sampling 111 according to handle well known in the artly.For example, because descending PSCH subchannel is known PSCH 256 chip sequences or the PSCH code that periodically occurs (promptly repeating) in each time slot of descending SCH signal, 205 pairs of PSCH unit have received sampling 111 and PSCH code and have carried out relevantly, and provide the peak correlation value that is associated.In this, PSCH unit 205 comprises the buffer (two all do not illustrate) of the output signal of matched filter and storage matched filter.PSCH unit 205 offers processor 135 via signaling 206 with peak correlation value.Can (for example four to 20 time slots) average this peak correlation value on a plurality of time slots of radio frame receiving, reduce the probability of " spurious lock ".(because PSCH uses a plurality of time slots rather than frame synchronously, it is more a lot of soon than the SSCH frame synchronization of above-mentioned prior art.) if peak correlation value is not more than predetermined threshold, processor 135 control PSCH unit 305 continue to handle any received signal, continue to search the sub-district.Yet, if peak correlation value greater than predetermined threshold, UE 20 finishes slot synchronization.Optionally method is when peak correlation value exceeds predetermined additive factor of the highest correlation of the next one or multiplication factor, is considered as having finished slot synchronization.
In case obtained slot synchronization in step 305, which in 64 scrambler groups of sub-district 15 uses UE 20 must determine, wherein has the particular sequence of 15 SSCH codes to discern each scrambler group.As used herein, 64 scrambler groups form the set of scrambler group.In forming the scrambler group, each SSCH code or symbol are that the alphabet from for example 16 symbols of 1 to 16 obtains.Similarly, the scrambler group of demonstration for example organizes 1, can comprise 15 following SSCH symbols:
[1?1?2?8?9?10?15?8?10?16?2?7?15?7?16]
And another scrambler group for example organizes 2, can comprise 15 following SSCH symbols:
[1?1?5?16?7?3?14?16?3?10?5?12?14?12?10]
According to principle of the present invention, in the step 310 of Fig. 4, processor 135 is according to determining the scrambler group and obtain frame synchronization based on the technology of soft decision.Particularly, as described below, processor 135 forms one group of tolerance (metric set) in the scrambler group each, and wherein each metric set comprises a plurality of metrics, and each metric is associated with the particular cyclic shift of each scrambler group.Then, processor 135 is selected maximum metric from all metric set.From wherein having selected peaked specific metric set identification scrambler group, and be identified for obtaining the frame shifting amount of frame synchronization with the corresponding cyclic shift of selected metric.Should be appreciated that in order to simplify the not shown error condition of flow process described here.For example, when attempting frame synchronization,, then unfortunately, restart above-mentioned Cell searching if UE has lost slot synchronization.
According to the solution of the present invention, Fig. 5 shows the play configuration that is used for SSCH unit 210.SSCH unit 210 comprises having correlator bank 220 and the memory 230 of K correlator 220-1 to 220-K.Each correlator according to time slot to receiving sampling 111 and a plurality of code word C
1To C
kIn each be correlated with.Equally, correlator bank 220 each time slot provide K correlator value to memory 230.Memory 230 is stored correlator value in the receiving slot at S, that is, memory 230 has been stored S * K correlator value.Should be appreciated that and other memory (for example memory 140) can also be used to store correlator value.Demonstration ground, in this example, code word is the SSCH code, promptly, at each probable value of SSCH code, there is a correlator in K=16, S=15, and the frame net value (frameworth) of memory 230 storage correlator value, i.e. 240 values.As shown in Figure 6, correlator value is organized as with demonstrating the matrix or the table of correlator value based on the storage of frame in memory 230.In order to simplify, only show the form of matrix 212 among Fig. 6, that is, and the correlator crest value of not indication reality in each unit of matrix 212.Each row of matrix 212 arrives one of SSCH16 corresponding to 16 SSCH code SSCH 1; Each row is corresponding to one of 15 time slots (time slot 1 is to time slot 15).In other words, each row has been stored the correlator value of the probability that in fact is illustrated in a specific SSCH code that receives in this time slot, or confidence indicator.For example, for particular time-slot, if SSCH code 1 has correlation peak 1000, and for identical time slot, SSCH code 2 only has correlation peak 500, then in this time slot, sends SSCH code 1 rather than SSCH code 2 and has higher confidence level.Therefore, according to principle of the present invention, the matrix collection of correlator value and maintenance and at least one frame might receive the relevant information of SSCH code, therefore, as described below, when under abominable channel condition, operating, provide improved ability to obtain the SSCH channel.
Forward Fig. 7 now to, show illustrative flow chart in accordance with the principles of the present invention, be used to realize the step 310 of Fig. 4.Particularly, in step 350, SSCH unit 210 is in the SSCH code each of may receiving of at least one frame (that is, 15 time slots), a plurality of correlations of storage in the matrix of above-mentioned correlator value 212.(should be noted that and in the matrix of correlator value, to add up and to store a plurality of frame net value of related data).In step 355, processor 135 is by signaling paths 211 references to storage 230 of Fig. 3, and uses numerical value in the matrix that is stored in correlator value 212 to come the matrix or the table (metric matrix) of degree of certainty value.Fig. 8 shows illustrative metric matrix 213.Equally,, only show the structure of matrix 213 among Fig. 8 in order to simplify, that is, and the metric of not indication reality in each unit of matrix 213.Each row of matrix is corresponding to one of predetermined scrambler group, and each row of matrix are corresponding to the particular cyclic shift of scrambler group.As from Fig. 8 finding, each clauses and subclauses in the metric matrix are associated with metric set, and described metric set comprises a plurality of metrics that are associated with the different cyclic shifts of shown in Figure 8 group 64 scrambler group.At the given displacement of given scrambler group, processor 135 is determined each metric, as the summation of the confidence value of this sequence.After the degree of certainty moment matrix, in step 360, the correlator peak values in the processor 135 selectance moment matrixs then.Because each metric is associated with the particular cyclic shift of specific scramble codes group, in step 365, the scrambler group that processor 135 selections are associated with correlator peak values (promptly, associated line), and (promptly in the definite slot offset amount that is associated with correlator peak values of step 370, associated column), to finish frame synchronization.
As further demonstration, consider the following example of simplifying.Suppose the SSCH code alphabet comprise 4 codes or symbol 1,2,3,4}, and the number of time slot is 2 in each frame.Further hypothesis predefine following scrambler group:
Group 1=[1,4],
Group 2=[1,2],
Group 3=[3,1], and
Group 4=[2,3].
For example, according to above-mentioned definition, will organize 1 and be defined as SSCH symbol sebolic addressing 1,4.
Equally, SSCH unit 210 comprises four correlators, and { 1,2,3, each among the 4} compares each correlator to receiving 111 and four possibilities of sampling symbol according to time slot.According to the step 350 of Fig. 7, may receive the SSCH code at each each in two time slots, a plurality of correlation peaks have been stored in SSCH unit 210 in the matrix of correlator value.At specific two time slots, Fig. 9 shows the illustrative matrix of correlator value.As from Fig. 9 finding, for symbol 1, correlator value 2 and the probability correlation connection that in first time slot, receives symbol 1, and correlator value 7 and the probability correlation connection that in second time slot, receives symbol 1, or the like.Then, according to the step 355 of Fig. 7, processor 135 is at each scrambler group formation metric matrix as shown in figure 10.For example, for group 1, processor 135 is at first determined the tolerance with cyclic shift zero correlation connection.This carries out by following operation: with reference to the matrix of correlator value, correlator value (numerical value 2) that will be associated with the symbol 1 in first time slot and correlator value (numerical value 6) addition that is associated with symbol 4 in second time slot are to produce metric 8.Figure 11 has further demonstrated this calculating.Then, processor 135 is determined remaining metric according to similar mode.For example, for group 1, the tolerance that is associated with cyclic shift 1 (that is, the probability of actual reception sequence [4,1]) equals 10, or the like.
Continue this example, return Fig. 7, after degree of certainty moment matrix, processor 135 the highest metric in step 360 selectance moment matrix then.In example, be numerical value 33.As from Figure 10 finding, numerical value 33 corresponding to group 4 row that are associated and with displacement 0 row that are associated.Therefore, processor 135 as the scrambler group, and determine to need displacement to use separately in frame synchronization in step 370 in step 365 selection group 4.
In case SSCH handles and completes successfully in step 370, the sign of the scrambler group of sub-district 15 makes UE 20 (comprise for example Common Pilot Channel (CPICH) to all other down channels of sub-district, be used for Frequency Synchronization, also be used for determining the actual scrambler of sub-district according to the scrambler group of being discerned) carry out descrambling, so that the beginning voice/data communications.
Forward Figure 12 now to, showing in accordance with the principles of the present invention, false code realizes.In the false code of Figure 12, symbol rx_data is 256 samplings of reception of given time slot, SSC[i, j] be j sampling in i the SSCH code, group_seq is the matrix look-up table in all 64 scrambler group sequences, group is the transmission code-group of identification, and offset is the frame slot side-play amount.
Figure 13 and 14 shows in accordance with the principles of the present invention, at UMTS receiver simulation result.Figure 13 shows the simulation result under the noise-free case.In Figure 13, the metric of numeric representation metric matrix.Big peak value 401 expression maximal metric value, and discerned as correct group and scrambler group # 10 side-play amount, that have side-play amount 0.On the contrary, Figure 14 shows the simulation result under the unusual low signal-to-noise ratio situation.Equally, in Figure 14, the metric of numeric representation metric matrix.Big peak value 402 expression maximal metric value, and discerned correct group of same conduct and scrambler group # 10 side-play amount, that have side-play amount 0.Although the tolerance of Figure 14 appears to have noise, in fact peak-peak 402 is higher than next peak-peak 11%.Should be noted that for emulation same as shown in Figure 14 typical hard decision algorithm is failed and discerned the group 2 with side-play amount 1 mistakenly.Therefore, different with method based on hard decision, because the technology based on soft decision described here does not abandon and receives information or the data that the SSCH code is associated, the soft decision method of notion can execution better under abominable channel condition according to the present invention.
As mentioned above, according to principle of the present invention, a kind of wireless receiver uses to be determined the scrambler group and obtains frame synchronization based on the technology of soft decision.Should provide a kind of method and apparatus that in the UMTS receiver, carries out robust secondary cell search based on the technology of soft decision.Certainly, although need extra memory cell, memory or space, half-way house is, when when operating under the abominable channel condition (for example, very low signal-to-noise ratio), wireless receiver has the enhancing ability of obtaining the SSCH channel.Although described the situation that search of initial zone is handled, notion of the present invention can be applied to wherein to handle in the arbitrary portion of radio operation of down channel (for example SSCH subchannel).
Therefore only show principle of the present invention above, and can recognize, clearly do not illustrate, realize principle of the present invention and be in various optional setting in its spirit and scope although those skilled in the art can design at this.For example, although in the context of separate functional unit, illustrated, can realize these functional units at one or more integrated circuits (IC) and/or in one or more program stored processor controls (for example microprocessor or digital signal processor (DSP)).Similarly, although demonstrate in the context based on the system of UMTS, the present invention is applicable to other communication system.Therefore, be appreciated that and make various modifications to the embodiment that illustrates, and can design other setting, and do not break away from the defined spirit and scope of the invention of claims.
Claims (14)
1. method of using in wireless receiving comprises:
Received signal (111), described signal indication be based on S symbol of a plurality of time slots, and wherein S symbol is associated with synchronization character from the set of M synchronization character, wherein S＞1 and M＞1; And
Estimate the associated synchronisation word by basis with each metric that is associated in M the synchronization character (310), obtain frame synchronization with respect to a plurality of time slots.
2. method according to claim 1, the step of wherein obtaining frame synchronization comprises:
Storage is at K correlator value of each time slot, and each correlator value is represented the received signal and K each in the receiving symbol relevant, wherein K＞1 in one of S time slot;
Determine at each metric set in M the synchronization character according to the correlator value of being stored;
From determined all metric set, select correlator peak values; And
Determine according to selected correlator peak values: (a) one of M synchronization character, as the estimation that receives synchronization character; And (b) with respect to slot offset amount a plurality of time slots, that be used to obtain frame synchronization.
3. method according to claim 2, wherein each in M synchronization character comprises unique symbol sebolic addressing, wherein the step for each the degree of certainty duration set in M the synchronization character comprises step:
Carry out S cyclic shift of synchronization character; And
For each cyclic shift, in each of S time slot, add the corresponding correlator value that is associated with the pattern of symbol together.
4. method according to claim 1, wherein each symbol is secondary synchronization channel (SSCH) symbol of universal mobile telephone system (UMTS), and M synchronization character is 64 scrambler group sequences.
5. method according to claim 4, the step of wherein obtaining frame synchronization comprises:
Form matrix of correlation peak according to receiving synchronization character, each row of matrix is associated with a plurality of one of SSCH symbols that may receive, each row of matrix are associated with one of a plurality of time slots, wherein each correlator peaks represent S in the corresponding time slot each in the receiving symbol may receive in the SSCH symbol relevant between each with a plurality of;
For each each cyclic shift in 64 scrambler groups, form metric according to the correlation peak matrix;
The identification correlator peak values; And
Determine according to the correlator peak values of being discerned: (a) one of 64 scrambler group sequences, as the estimation that receives synchronization character; And (b) with respect to a plurality of time slots, be used to obtain frame synchronization and the related cyclic shift used.
6. method according to claim 5 wherein forms the metric step and comprises step:
Form metric matrix, each row of metric matrix is associated with one of 64 scrambler groups, and each row of metric matrix are associated with cyclic shift; And
By adding the corresponding correlator peaks that is associated with the particular cyclic shift of specific scramble codes group, determine each metric.
7. method of using in universal mobile telephone system (UMTS) receiver comprises:
Reception is from the signal emission of UMTS transmitter, expression secondary synchronization channel (SSCH), SSCH transmits the sequence of SSCH symbol based on S time slot, described sequence is associated with the scrambler group, and described scrambler group is associated with the UMTS transmitter, wherein obtains the scrambler group from the set of 64 scrambler groups;
Storage representation receives the data of the probability of each in K the SSCH symbol, wherein K＞1 in each of S time slot;
According to the data degree of certainty value of being stored, each metric represents to receive the probability of particular cyclic shift specific in 64 scrambler groups;
The identification correlator peak values; And
According to correlator peak values, determine: (a) related scrambler group, as the scrambler group of UMTS transmitter; And (b) with respect to the slot offset amount of related cyclic shift S time slot, that be used to obtain frame synchronization.
8. method according to claim 7, wherein store data step and comprise:
With in K the SSCH symbol each with S time slot in received signal in each carry out relevant, so that K corresponding correlator value to be provided; And
The individual corresponding correlator value of each K that is associated in storage and S the time slot.
9. a universal mobile telephone system (UMTS) equipment comprises:
Front end (105), be used to receive from the wireless signal emission of UMTS transmitter, expression secondary synchronization channel (SSCH), and provide sample streams thus, SSCH transmits the sequence of SSCH symbol based on S time slot, described sequence is associated with the scrambler group, described scrambler group is associated with the UMTS transmitter, wherein obtains the scrambler group from the set of 64 scrambler groups;
Memory (230) is used for storage representation and receives the data of the probability of each in K the SSCH symbol, wherein K＞1 in each of S time slot; And
Processor (135) is used for (a) according to the data degree of certainty value of being stored, and each metric represents to receive the probability of particular cyclic shift specific in 64 scrambler groups; (b) identification correlator peak values; And, determine (c) according to correlator peak values: (1) related scrambler group, as the scrambler group of UMTS transmitter; And (2) are with respect to the slot offset amount of related cyclic shift S time slot, that be used to obtain frame synchronization.
10. UMTS equipment according to claim 9, the data of wherein representing probability are correlator value, and comprise correlator bank, be used for (a) with K SSCH symbol each with S time slot in received signal in each carry out relevant, so that K corresponding correlator value to be provided; And (b) the individual corresponding correlator value of each K that is associated in storage and S the time slot.
11. UMTS equipment according to claim 10, wherein processor is determined the metric of each particular cyclic shift in the scrambler group by add the correlator value that is associated with the pattern of symbol together in each of S time slot.
12. an equipment that uses in wireless receiver, described equipment comprises:
Front end (105) is used to receive the wireless signal of expression frame sequence, and sample streams is provided thus, and each frame is based on the sequence of a plurality of time slots transmission symbols, and described sequence is associated with radio signal source in advance;
Memory (140) is used to store the table of metric, and each row of described table is associated with one of M synchronizing symbol sequence, M＞1, and each row of described table are associated with the cyclic shift of M sequence; And
Processor (135) is used for the correlator peak values that the table of (a) resolution value is stored; (b), determine according to the correlator peak values of being discerned: one of (1) M synchronizing symbol sequence, as the estimation of receiving symbol sequence; And (2) with respect to receive wireless signal, be used to obtain the related cyclic shift that frame synchronization is used.
13. equipment according to claim 12, also comprise memory (230), be used to store the table of correlation, each row of described table is associated with a plurality of one of receiving symbols, each row of described table are associated with one of a plurality of time slots, wherein each correlation is represented in sampling and a plurality of receiving symbols in the corresponding time slot relevant between each, wherein obtains the table of metric according to the table of correlation.
14. equipment according to claim 13, wherein processor is by adding the correlation that is associated with the pattern of symbol together in each of S time slot, the metric of each particular cyclic shift of each in definite that stored, M sequence.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2003/024527 WO2005018104A1 (en) | 2003-08-04 | 2003-08-04 | Frame synchronization using soft decisions in a universal mobile telephone system receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1820423A true CN1820423A (en) | 2006-08-16 |
Family
ID=34192549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA03826871XA Pending CN1820423A (en) | 2003-08-04 | 2003-08-04 | Frame synchronization using soft decisions in universal mobile telephone system receiver |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1652314A1 (en) |
| JP (1) | JP2007521681A (en) |
| CN (1) | CN1820423A (en) |
| AU (1) | AU2003261385A1 (en) |
| WO (1) | WO2005018104A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1864524B1 (en) * | 2005-03-28 | 2010-06-23 | Thomson Licensing | Improved cell search for handover conditions |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6363060B1 (en) * | 1999-06-30 | 2002-03-26 | Qualcomm Incorporated | Method and apparatus for fast WCDMA acquisition |
-
2003
- 2003-08-04 WO PCT/US2003/024527 patent/WO2005018104A1/en active Application Filing
- 2003-08-04 EP EP03818215A patent/EP1652314A1/en not_active Withdrawn
- 2003-08-04 JP JP2005507883A patent/JP2007521681A/en active Pending
- 2003-08-04 AU AU2003261385A patent/AU2003261385A1/en not_active Abandoned
- 2003-08-04 CN CNA03826871XA patent/CN1820423A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2005018104A1 (en) | 2005-02-24 |
| EP1652314A1 (en) | 2006-05-03 |
| JP2007521681A (en) | 2007-08-02 |
| AU2003261385A1 (en) | 2005-03-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6741578B1 (en) | Apparatus and method for synchronizing channels in a W-CDMA communication system | |
| CN1190908C (en) | PN sequence identifying device in CDMA communication system | |
| CN1087575C (en) | Method and apparatus for detecting pilot signals and subscriber | |
| CN1279569A (en) | Sation system having processor to elimnate parallel interference | |
| CN1157006C (en) | CDMA mobile communication equipment and base station test method thereof | |
| CN1856945A (en) | Initial synchronization for receivers | |
| CN1901407A (en) | Cell search procedure for tdd/cdma communications systems | |
| US7065129B2 (en) | Acquisition of a gated pilot by avoiding partial correlation peaks | |
| US6834075B2 (en) | Method for improving multipath searcher speed | |
| CN1314037A (en) | Frame synchronization techniques and systems for spread spectrum radiocommunication | |
| US20050002442A1 (en) | Method and apparatus for detection of Pilot signal with frequency offset using multi-stage correlator | |
| CN1820437A (en) | Frequency synchronization during cell searching in universal mobile telephone system receiver | |
| CN1816990A (en) | Self-adaptive frame synchronization in general mobile telephone system receiver | |
| CN1132329C (en) | Method and apparatus for configuring Rake receiver | |
| US6628634B2 (en) | Fast decoding of long codes | |
| CN1460335A (en) | System and method for radio transmitter signal acquisition | |
| JP2007521677A6 (en) | Adaptive frame synchronization in universal mobile communication systems and receivers | |
| CN1820423A (en) | Frame synchronization using soft decisions in universal mobile telephone system receiver | |
| US20060188009A1 (en) | Frame synchronization using soft decisions in a universal mobile telephone system receiver | |
| CN1627835A (en) | Method for testing modulated phase cluster of sync code in time division synchronization CDMA access system | |
| CN1809972A (en) | Cell search process for wireless communication system | |
| KR20060094076A (en) | Frame synchronization using soft decisions in a universal mobile telephone system receiver | |
| KR20060089718A (en) | Adaptive frame synchronization in a universal mobile telephone system receiver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20060816 |