CN101162918B - Method and system for detecting the third symbol of SCDMA system access exploration sequence - Google Patents
Method and system for detecting the third symbol of SCDMA system access exploration sequence Download PDFInfo
- Publication number
- CN101162918B CN101162918B CN2006101407631A CN200610140763A CN101162918B CN 101162918 B CN101162918 B CN 101162918B CN 2006101407631 A CN2006101407631 A CN 2006101407631A CN 200610140763 A CN200610140763 A CN 200610140763A CN 101162918 B CN101162918 B CN 101162918B
- Authority
- CN
- China
- Prior art keywords
- symbol
- result
- module
- sync1
- vector projection
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The invention relates to a test method and a system of a third signal of SYNC1 in a SCDMA system. The method is that the received third signal of SYNC1 is processed with a matched filtering in an access time slot window. A received first signal and a second signal of SYNC1 are processed with a vector projection by using the result of the matched filtering treatment of the third signal. The result of the vector projection treatment is processed with a united decision to find out a Walsh code used by the third signal. The system includes a receiving module, a matched filtering module, a vector projection module, a united-decision module and a decision measurement module. The invention effectively improves the test probability of the third signal of SYNC1 when regular signal interference exists; consequently a base station can reliably detect the most possible SYNC1 in the interference situation and reduces the influence of the interference to the minimum.
Description
Technical field
The present invention relates to the detection method of access exploration sequence in a kind of TDD wireless communication system, relate in particular to the detection method and the system of the 3rd symbol of access exploration sequence in a kind of SCDMA system.
Background technology
In time division duplex (TDD) wireless communication system, the access procedure of terminal normally, access terminal and launch a specific access exploration sequence in a certain position of ascending time slot earlier, the base station is by knowing the access of terminal to the detection of access exploration sequence in this position, and then in descending time slot, send signaling, so that further get in touch, and then control and finish the process that terminal inserts with terminal.Therefore, send access exploration sequence and can set up the first step of calling at last.
The TDD wireless communication system has all defined the access slot window, base station detection of (being access exploration sequence) to received signal in this access slot window adopts matched filtering to realize usually, the base station judges according to testing result whether it receives access exploration sequence afterwards, and understands the information of carrying in the access exploration sequence.Wherein, access exploration sequence is generally one or several possible known particular sequence, and the base station need judge whether to receive access exploration sequence, and which access exploration sequence is.
In the SCDMA system, access exploration sequence (SYNC1) is detected in the original position of each ascending time slot in the base station.In the SCDMA system, SYNC1 comprises three symbols, and wherein preceding two symbols are the spreading codes that carry out spread spectrum with the Walsh0 sign indicating number, and the spreading code of the 3rd symbol can have some kinds (maximum 8 kinds) to select.In the SCDMA system, three symbols of SYNC1 are carried out the operating process of spread spectrum shown in Figure 1A and 1B; Wherein, Figure 1A is the operational flowchart that preceding two symbols of SYNC1 is carried out spread spectrum, and Figure 1B is the operational flowchart that the 3rd symbol of SYNC1 is carried out spread spectrum.From Figure 1A and 1B as can be seen, what both difference were the 3rd symbol carried out that spread spectrum uses is the PN_Walshx sequence, rather than employed PN_Walsh0 sequence when preceding two symbols are carried out spread spectrum.Because the Walsh0 sign indicating number is complete 0 sequence, the result of Walsh0 sign indicating number XOR PN sequence is exactly a PN sequence itself.And when the 3rd symbol to SYNC1 carries out spread spectrum, employing be x=4m+1 (m=0,1 ..., 7) one of them and PN sequence of these 8 Walsh sign indicating numbers carry out XOR, thereby make the spreading code of the 3rd symbol of SYNCI that some kinds of selections can be arranged.
In the SCDMA system, the base station is after the access slot windows detecting goes out to receive the SYNC1 of terminal emission, also need respectively every kind at the 3rd symbol of SYNC1 may (i.e. the various Walsh sign indicating numbers of the 3rd symbol correspondence) detect, testing process is the base station and may does matched filter processing to the various of the 3rd symbol earlier as shown in Figure 2; Then all matched filtering results are carried out cascading judgement, seek a most probable SYNC1, promptly judge Walsh sign indicating number selected when terminal sends this SYNC1, measure the power of this SYNC1 simultaneously and receive the skew of synchronous points, so that control and finish the access procedure of terminal with ideal.In ensuing control procedure, the base station responds detected matched filtering result (Walsh sign indicating number) (SS Enable) message and sends to terminal by inserting together with the adjustment information such as skew, power that receive synchronous points with ideal; Terminal can be judged consistent when whether the Walsh sign indicating number in the SS Enable message of receiving sends SYNC1 with oneself; If unanimity then continues access procedure; Otherwise stop this time to insert, retransmit new SYNC1 so that restart access procedure, the flow chart of relevant judgement Walsh sign indicating number as shown in Figure 3.By the judgement of Walsh sign indicating number, can avoid terminal to insert the influence that collision brings the SCDMA system to a certain extent.
Yet, when there is the interference (for example remote co-channel interference of TDD wireless communication system) of stronger regular signal in the access slot window, can cause access exploration sequence to be polluted, thereby the base station is reduced the power that is detected as of access exploration sequence.Also can see from Fig. 3, in the SCDMA system, even the base station detects the existence of SYNC1, influence but if the matched filtering result of the 3rd symbol of SYNC1 is interfered, the detection of the 3rd symbol in base station can be judged by accident, can send wrong SS Enable message when serious, thereby cause terminal to insert the further reduction of the probability of success.
In view of above-mentioned, being necessary to design a kind of the existence in the SCDMA system in fact can be to the 3rd method that symbol detects of SYNC1, so that the base station can detect most possible SYNC1 reliably and the influence that interference causes is reduced to minimum under the situation that has interference under the situation about disturbing.
Summary of the invention
Technical problem to be solved by this invention is in the SCDMA system, and how the base station is detected the 3rd symbol of the SYNC1 of detected terminal emission existing under the situation about disturbing.
For achieving the above object, the present invention proposes the detection method of the 3rd symbol of a kind of SCDMA SYNC1 of system, and wherein the detection to the 3rd symbol of this SYNC1 that has received comprises the steps: after detection receives described SYNC1
Step 1: the 3rd symbol to the described SYNC1 that has received in the access slot window carries out matched filter processing;
Step 2: utilize the result of the matched filter processing of described the 3rd symbol that first and second symbol of the described SYNC1 that has received carried out the vector projection process;
Step 3: the result to the vector projection process carries out cascading judgement, seeks out described the 3rd the Walsh sign indicating number that symbol is selected, and measures power and and the desirable skew that receives synchronous points of this SYNC1 simultaneously.
Further, be under several the situation at the number of the selected Walsh sign indicating number of described the 3rd symbol,
Step 1 is: all the Walsh sign indicating numbers to described the 3rd symbol in the access slot window carry out matched filter processing respectively;
Step 2 is: utilize set that the result of all matched filter processing forms that described first and second symbol are carried out the vector projection process.
Wherein, the matched filter processing of carrying out in the step 1 is handled by despreading and is realized.
Further, described step 2 is specially:
Step 21: utilize the amplitude of described first and second symbol and result that phase information is handled the despreading of described the 3rd symbol to carry out beam forming processing;
Step 22: the result who utilizes described beam forming processing carries out the vector projection to described first and second symbol.
Wherein, the result that the despreading of described the 3rd symbol handled for the amplitude of utilizing described first and second symbol and the resulting wave beam forming vector of phase information of step 21 carries out beam forming processing.Described wave beam forming vector is by described first and the amplitude of second symbol and on average obtaining of phase information, and promptly described wave beam forming vector is:
Wherein, S
N, jThe despreading information of n symbol on j radio-frequency channel of SCDMA system for the described SYNC1 that has received; Wherein, j is 0～7 positive integer.
Further, the method for in the step 3 result of vector projection process being carried out cascading judgement is: select the result of maximum among the result of a vector projection process result as cascading judgement.
For achieving the above object, the present invention proposes the detection system of the 3rd symbol of a kind of SCDMA SYNC1 of system again, comprising: receiver module, matched filtering module, cascading judgement module and judgement and measurement module wherein also comprise:
The vector projection module, first of the SYNC1 that the output result who is used to utilize described matched filtering module has received to described receiver module and second symbol carry out the vector projection process;
Wherein, described vector projection module is connected between described matched filtering module and the described cascading judgement module; And described cascading judgement module is used to receive the output of vector projection module, and the output result of vector projection module is carried out cascading judgement.
Wherein, the described matched filtering module matched filter processing of carrying out is handled by despreading and is realized.Described cascading judgement module is selected the result of maximum among the output result of a vector projection module result as cascading judgement.
In the SCDMA system, after the base station detection has received the SYNC1 of terminal emission, compare with the detection method of the 3rd symbol of SYNC1 in the existing SCDMA system, the result of the matched filter processing of three symbol of the present invention by utilizing the SYNC1 received carries out the vector projection process to preceding two symbols of the SYNC1 that received, improved the detection probability of the 3rd symbol of SYNC1 under the situation of the interference that is subjected to regular signal effectively, thereby made the base station under the situation that has interference, detect most possible SYNC1 reliably and the influence that interference causes is reduced to minimum.
Description of drawings
Figure 1A is for carrying out the operating process schematic diagram of spread spectrum to preceding two symbols of SYNC1 in the SCDMA system;
Figure 1B is the operating process schematic diagram that in the SCDMA system the 3rd symbol of SYNC1 is carried out spread spectrum;
Fig. 2 is three the schematic flow sheet that symbol detect of base station in the SCDMA system to SYNC1;
Fig. 3 is the schematic flow sheet of the selected Walsh sign indicating number of the 3rd symbol of judgement SYNC1 in the SCDMA system;
Fig. 4 is the schematic flow sheet of detection method of the present invention;
Fig. 5 is the structural representation of detection system of the present invention.
Embodiment
Below in conjunction with accompanying drawing, concrete enforcement of the present invention is further described in detail; Wherein, it should be noted that the present invention only describes the detection that base station in the SCDMA system detects behind the SYNC1 the 3rd symbol of SYNC1, prolong with the existing detection technique that exists in the TDD wireless communication system the detection of SYNC1 relevant base station.
As shown in Figure 4, detection method of the present invention in the present embodiment mainly comprises the steps.
Step 1: the base station is carried out despreading respectively to all Walsh sign indicating numbers of the 3rd symbol of the SYNC1 that received and is handled in the access slot window.
Because the SCDMA system has adopted intelligent antenna technology, the base station can utilize amplitude and the phase information of preceding two symbols on each root antenna of detected SYNC1, obtain corresponding wave beam forming vector (WEIGHT), thereby be used for the 3rd symbol of SYNC1 made wave beam forming.
Therefore, step 2: the amplitude and the resulting wave beam forming vector of the phase information W of first of the SYNC1 that the base station utilization has received and second symbol
jBeam forming processing is carried out in the set that the result that all despreadings of the 3rd symbol of SYNC1 on each root antenna of smart antenna are handled forms; Wherein the result that obtains of beam forming processing is Y
m
Wherein, the beam forming processing of present embodiment is to utilize many antennas the set of result's composition of the despreading processing of all Walsh sign indicating numbers of the 3rd symbol to be carried out the process of airspace filter.
Described wave beam forming vector W
jBy first and the amplitude of second symbol and on average the obtaining of phase information of the SYNC1 that has received, promptly described wave beam forming vector W
jFor:
Wherein, S
N, jBe the despreading information of n symbol on j radio-frequency channel of SCDMA system of the SYNC1 that received, j is 0～7 positive integer.
In the present embodiment, base station wave beam forming vector W
jThe X as a result that the despreading of the 3rd symbol of SYNC1 on each root antenna of smart antenna is handled
mCarry out beam forming processing, wherein beam forming processing is according to Y
m=X
m* W
HCarry out; Wherein, X
m=[S
3.1, S
3.2..., S
3.8] SYNC1 that receives on expression smart antenna 8 antennas the 3rd symbol to each may form the result that handles of despreading, promptly the despreading result of Walshx (x=4m+1, m=0 wherein, 1 ..., 7); Y
mBe the result after the 3rd symbol of SYNC1 on each root antenna of smart antenna carries out wave beam forming (being airspace filter).
Step 3: the base station utilizes the Y as a result of beam forming processing
mFirst and second symbol to the SYNC1 that received carry out the vector projection;
Because wave beam forming vector W
jBe that despreading result from preceding two symbols of the SYNC1 that received tries to achieve, therefore, the result who on the engineering first and second symbol of the SYNC1 that received is carried out the vector projection process can directly get Y
mReal part, promptly the result of vector projection process is: Y
m'=Re (Y
m)=Re (X
m* W
H).
Step 4: the base station is to the Y as a result of vector projection process
m' carry out cascading judgement, seek out the 3rd the Walsh sign indicating number that symbol is selected of the SYNC1 that has received, and measure simultaneously this SYNC1 power and with the desirable skew that receives synchronous points; Wherein, in the present embodiment, the Y as a result of base station selected vector projection process
mA result of ' middle maximum is as the result of cascading judgement, thereby can obtain good detection probability.
In addition, the structural representation of the detection system of the 3rd of the SCDMA SYNC1 of system of the present invention the symbol as shown in Figure 5.This detection system comprises:
Receiver module is used for the access exploration sequence in the emission of access slot window receiving terminal;
The despreading module, the output that is used to obtain receiver module, and all Walsh sign indicating numbers of the 3rd symbol of the SYNC1 that receiver module has been received carry out despreading respectively and handle; Wherein the number at the selected Walsh sign indicating number of the 3rd symbol of SYNC1 is under several the situation, and the number of despreading module is identical with the number of Walsh sign indicating number, and the parallel connection of each despreading module;
The vector projection module, first of the SYNC1 that the output result who is used to utilize each despreading module has received to receiver module and second symbol carry out the vector projection process;
The cascading judgement module is used to receive the output of vector projection module, and the result of vector projection process is carried out cascading judgement; Wherein, in the present embodiment, the cascading judgement module is selected the result of maximum among the output result of a vector projection module result as cascading judgement; And
Judgement and measurement module are used to receive the output of cascading judgement module, and determine the 3rd the Walsh sign indicating number that symbol is selected of the SYNC1 that received according to the result of cascading judgement, and measure simultaneously this SYNC1 power and with the desirable skew that receives synchronous points.
Should be pointed out that this paper is described in detail concrete enforcement of the present invention with top, but it is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.It will be apparent to those skilled in the art that and can also make some improvements and modifications under the prerequisite that does not break away from the principle of the invention, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. the detection method of the 3rd of a SCDMA system access exploration sequence the symbol is characterized in that, the detection to the 3rd symbol of this access exploration sequence that has received after detection receives described access exploration sequence comprises the steps:
Step 1: the 3rd symbol to the described access exploration sequence that has received in the access slot window carries out matched filter processing;
Step 2: utilize the result of the matched filter processing of described the 3rd symbol that first and second symbol of the described access exploration sequence that has received carried out the vector projection process;
Step 3: the result to the vector projection process carries out cascading judgement, seeks out described the 3rd the Walsh sign indicating number that symbol is selected, and measures the power and and the desirable skew that receives synchronous points of this access exploration sequence simultaneously.
2. detection method according to claim 1 is characterized in that, is under several the situation at the number of the selected Walsh sign indicating number of described the 3rd symbol,
Described step 1 is specially: all the Walsh sign indicating numbers to described the 3rd symbol in the access slot window carry out matched filter processing respectively;
Described step 2 is specially: utilize set that the result of all matched filter processing forms that described first and second symbol are carried out the vector projection process.
3. detection method according to claim 1 and 2 is characterized in that, the matched filter processing of carrying out in the step 1 is handled by despreading and realized.
4. detection method according to claim 3 is characterized in that, described step 2 is specially:
Step 21: utilize the amplitude of described first and second symbol and result that phase information is handled the despreading of described the 3rd symbol to carry out beam forming processing;
Step 22: the result who utilizes described beam forming processing carries out the vector projection to described first and second symbol.
5. detection method according to claim 4, it is characterized in that the result that step 21 is handled the despreading of described the 3rd symbol for the amplitude of utilizing described first and second symbol and the resulting wave beam forming vector of phase information carries out beam forming processing.
6. detection method according to claim 5 is characterized in that, described wave beam forming vector is by described first and the amplitude of second symbol and on average obtaining of phase information, and promptly described wave beam forming vector is:
Wherein, S
N, jThe despreading information of n symbol on j radio-frequency channel of SCDMA system for the described access exploration sequence that has received; Wherein, j is 0～7 positive integer.
7. detection method according to claim 1 and 2 is characterized in that, the method for in the step 3 result of vector projection process being carried out cascading judgement is: select the result of maximum among the result of a vector projection process result as cascading judgement.
8. the detection system of the 3rd of a SCDMA system access exploration sequence the symbol comprises: receiver module, matched filtering module, cascading judgement module and judgement and measurement module, it is characterized in that, and also comprise:
The vector projection module, first of the access exploration sequence that the output result who is used to utilize described matched filtering module has received to described receiver module and second symbol carry out the vector projection process;
Wherein, described vector projection module is connected between described matched filtering module and the described cascading judgement module; And described cascading judgement module is used to receive the output of vector projection module, and the output result of vector projection module is carried out cascading judgement.
9. detection system according to claim 8 is characterized in that, the matched filter processing that described matched filtering module is carried out is handled by despreading and realized.
10. detection system according to claim 8 is characterized in that, described cascading judgement module is selected the result of maximum among the output result of a vector projection module result as cascading judgement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101407631A CN101162918B (en) | 2006-10-09 | 2006-10-09 | Method and system for detecting the third symbol of SCDMA system access exploration sequence |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101407631A CN101162918B (en) | 2006-10-09 | 2006-10-09 | Method and system for detecting the third symbol of SCDMA system access exploration sequence |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101162918A CN101162918A (en) | 2008-04-16 |
| CN101162918B true CN101162918B (en) | 2010-09-15 |
Family
ID=39297771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101407631A Expired - Fee Related CN101162918B (en) | 2006-10-09 | 2006-10-09 | Method and system for detecting the third symbol of SCDMA system access exploration sequence |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101162918B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1401197A (en) * | 2000-02-24 | 2003-03-05 | 西门子信息通讯网络公司 | Method for optimizing the random access procedures in the cdma cellular networks |
| CN1451250A (en) * | 2000-03-23 | 2003-10-22 | 西门子移动通讯公司 | Handover procedures in radio communication system |
| CN1451251A (en) * | 2000-03-23 | 2003-10-22 | 西门子移动通讯公司 | Access channel scheduling in a radio communication system |
-
2006
- 2006-10-09 CN CN2006101407631A patent/CN101162918B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1401197A (en) * | 2000-02-24 | 2003-03-05 | 西门子信息通讯网络公司 | Method for optimizing the random access procedures in the cdma cellular networks |
| CN1451250A (en) * | 2000-03-23 | 2003-10-22 | 西门子移动通讯公司 | Handover procedures in radio communication system |
| CN1451251A (en) * | 2000-03-23 | 2003-10-22 | 西门子移动通讯公司 | Access channel scheduling in a radio communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101162918A (en) | 2008-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101295999B (en) | Detection method for accidental precursor access | |
| CN101656553B (en) | Initial cell search in wireless communication systems | |
| CA2438364A1 (en) | Mobile communication system, base station, and communication control method | |
| CN101185250B (en) | Initial multi-path acquisition of random access channels | |
| CN1972165B (en) | An interference detection method and apparatus | |
| CN101316115A (en) | Detection method, equipment and system of pilot frequency sequence signal | |
| CN100459455C (en) | Random access detecting method based on intelligent antenna | |
| CN101242222B (en) | A device and method for detecting interference in uplink pilot channel | |
| CN100401660C (en) | Detection method of user terminal random access | |
| CN1606835A (en) | Cell search using peak quality factors | |
| CN101911560A (en) | Communication system, response notifying method and apparatus | |
| CN101141142B (en) | Method to reduce leakage checking of uplink synchronous detection | |
| CN102377720B (en) | ZC (zone code) sequence detection method and device in high-speed mode | |
| EP1263149A2 (en) | CDMA receiver | |
| EP1804392A1 (en) | A mobile terminal used in a code division multiple access mobile communication system | |
| CN101162918B (en) | Method and system for detecting the third symbol of SCDMA system access exploration sequence | |
| CN101026607B (en) | Common frequency community downlink synchronous code detecting method and device | |
| CN101248593A (en) | Method for accidental access detecting collision reprocessing for improving user access rate | |
| CN101170812A (en) | A signal receiving method for base station receiver | |
| CN101137189B (en) | Method and system for detecting uplink accessing test sequence of TDD communication system | |
| CN101198139B (en) | TD-SCDMA terminal and method for implementing co-channel interference subdistrict information real-time detection | |
| CN1595834B (en) | Method and apparatus for initial synchronization in CDMA mobile communication system | |
| CN102932814B (en) | Mobile terminal signal detection method, Apparatus and system | |
| CN100574296C (en) | The method and apparatus that signal is handled | |
| CN106941462A (en) | A kind of method and device of signal detection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20191121 Granted publication date: 20100915 |
|
| PD01 | Discharge of preservation of patent | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20200710 Granted publication date: 20100915 |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100915 Termination date: 20191009 |