CN1744466A - Method and device for increasing synchronous detection performance in synchronous CDMA system - Google Patents
Method and device for increasing synchronous detection performance in synchronous CDMA system Download PDFInfo
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Abstract
The method includes steps: based on position of up doing time slot of pilot frequency, determining SYNC_UL data in received signal; correlation power sequence is obtained by calculating correlation between NSYNC_UL and data of up doing time slot of pilot frequency, shift of guard gap; each correlative power sequence constitutes overall correlation power sequence Pcorr_raw; testing Pcorr_raw, determining data of up doing time slot of pilot frequency is SYNC_UL and peak value of SYNC_UL, and testing its values of time delay and amplitude; based on determined SYNC_UL, looking up correlation power sequence Pcorr_det between SYNC_UL and NSYNC_UL, based on time delay and amplitude Pcorr_det is adjusted to Pcorr_det', calculating Pcorr_det - Pcorr_det' so as to obtain Pcorr_min us; testing Pcorr_min us till new syn code can't be examined; based on priority of SYNC_UL, FPACH is arranged. The invention also discloses relevant device. The method improves capability of synchronous performance.
Description
Technical field
The present invention relates to the method and apparatus of uplink synchronous in a kind of synchronization code multi-address division system, relate in particular to the method and apparatus that improves the synchronous detecting performance in a kind of synchronization code multi-address division system.
Background technology
At synchronization CDMA (Code Division Multiple Access, code division multiple access) in the up link of communication system, a plurality of user terminal UE (User Equipment) send signal to base station (Node B), in order to prevent the phase mutual interference between the different user signal, need carry out synchronous detecting and control to each user, guarantee that it arrives the base station simultaneously.This will improve the capacity and the availability of frequency spectrum of system greatly.
As shown in Figure 1 and Figure 2; the radio frames of synchronous CDMA communications system comprises some subframes; in each subframe except a plurality of conventional time slots; also comprise 3 special time slots; be descending pilot frequency time slot (DwPTS), protection time slot (GP) and uplink pilot time slot (UpPTS) at interval; wherein UpPTS is ascending pilot frequency and Synchronization Design, is made up of at interval the protection of uplink synchronous (SYNC_UL) sign indicating number and this time slot inside.
In synchronous CDMA communications system, what insert at random that synchronous detecting refers to is exactly the process of setting up of uplink synchronous, after user terminal UE start, must at first set up down-going synchronous with the base station, only under the condition of down-going synchronous, could begin to set up uplink synchronous.Generally speaking, in CDMA mobile communication system, down link is always synchronous, and synchronization CDMA refers to uplink synchronous especially.
The foundation of uplink synchronous is finished in random access procedure, relates to ascending pilot channel (UpPCH) and Physical Random Access Channel (PRACH).User terminal UE is when inserting at random, at first in uplink pilot time slot (UpPTS), send uplink synchronous (SYNC_UL) sign indicating number, if base station node B can successfully detect this SYNC_UL sign indicating number, then the physical access channel (FPACH) in descending correspondence goes up to user terminal UE transmission confirmation, user terminal UE can go up to base station node B at the Physical Random Access Channel of distributing (PRACH) and send access information then, last base station sends to user terminal UE with the information of necessity again, and call setup is finished.
Detect the SYNC_UL sequence in search window after, base station node B estimates corresponding time-delay, answers user terminal UE by sending adjustment information then, makes user's terminal UE adjust launch time when launching next time.This process is finished in ensuing several subframes by FPACH.Sent after the PRACH, uplink synchronous is set up.Uplink synchronous when the uplink synchronous process also can be used for uplink loss rebulids.
Synchronous detecting is discerned the SYNC_UL sign indicating number by the antenna data of analyzing protection interval and uplink pilot time slot.If detect an effective SYNC_UL sign indicating number, then finish relevant parameters and measure task.
In following document, introduced prior art about synchronous detecting:
The patent application document that is entitled as " Synchronization detection circuit for radio communication; has matched filterto output correlation val UE between spreading code and data obtained by samplingspread signal using one-chip cycle sampling clock ", US publication: US20030152138, the open date: on August 14th, 2003; Japanese publication number: JP2003234677, the open date: on August 22nd, 2003; China publication number: CN1437323, the open date: on August 20th, 2003.
The patent application document that is entitled as " synchronization detecting apparatus has synchronization detector whichdetects synchronization using demodulated synchronization signal depending on channelestimation result using pilot signal ".US publication: US20020093988, the open date: on July 18th, 2002; Japanese publication number: JP2002217775, the open date: on August 2nd, 2002.
The patent application document that is entitled as " a kind of method and apparatus of catching the Random Access Channel preamble in the WCDMA system ", Chinese publication number: CN01113042, open date: on January 8th, 2003.
The patent application document that is entitled as " a kind of be used to detect the method that user terminal inserts at random ", Chinese publication number: CN1533199A, open date: on September 29th, 2004.
The patent application document that is entitled as " a kind of method and apparatus that improves synchronous detecting precision ".China publication number: CN1595835A, the open date: on March 16th, 2005.
" the access performance analysis at random of TD-SCDMA system ", Zhou Haijun, Yan Xiaoli, Xiong Simin, Xie Xianzhong work, Post and Telecommunications Institutes Of Chongqing's journal, the 14th the 4th phase of volume, in December, 2002, the 19th～23 page.
In the prior art, the process of synchronous detecting all is that all SYNC_UL are carried out simultaneously, that is to say if there are a plurality of UE to insert simultaneously, and synchronization detection process is differentiated simultaneously so has several SYNC_UL to initiate to insert.In fact, the their cross correlation of SYNC_UL sign indicating number is not desirable especially, and any one SYNC_UL will produce the correlated results of other SYNC_UL and disturb, thereby the synchronous detecting performance is reduced.
Summary of the invention
At synchronous existing problem and shortage in the cut-in method in the above-mentioned existing synchronization code multi-address division system, the purpose of this invention is to provide a kind of precision that improves synchronous detecting, realize improving in the simple synchronization code multi-address division system method and apparatus of synchronous detecting performance.
The present invention is achieved in that the method that improves the synchronous detecting performance in a kind of synchronization code multi-address division system, may further comprise the steps:
(1) after each antenna of base station side receives signal, determines the data segment of possible uplink synchronous code according to the position of uplink pilot time slot;
(2) with all uplink synchronous codes of described base station side respectively with uplink pilot time slot on antenna receive data and corresponding protection thereof and be shifted relevantly at interval, obtain the related power sequence; Each antenna of described base station receives the related power sequence of data and forms total correlation power sequence P
Corr_raw
(3) according to the preset detection condition to total correlation power sequence P
Corr_rawDetect, if the related power sequence has the item that meets the predetermined detection condition, the data that then corresponding uplink pilot time slot sends are uplink synchronous codes, enter step (4), otherwise enter step (8);
(4) in the uplink synchronous code that meets the predetermined detection condition, find out of power peak maximum as uplink synchronous code, and detect its delay parameter and range parameter;
(5) find out the corresponding uplink synchronous code that is pre-stored in the look-up table and the related power sequence P of described all uplink synchronous codes of base station side according to the sequence number of the uplink synchronous code that finds in the step (4)
Corr_det
(6) according to detected delay parameter and range parameter in the step (4) to P
Corr_detCarry out the adjustment on timing and the amplitude, obtain P
Corr_det', calculate P
Corr_raw-P
Corr_det', obtain the result of relevant power sequence newly, be designated as P
Corr_min us
(7) with related power sequence P
Corr_min usReturning step (3) detects again;
(8) judge whether the total correlation power sequence is detected first, if then think do not have uplink synchronous to insert, step finishes; Otherwise the priority level according to detected uplink synchronous code respective user is carried out the physical access channel arrangement, carries out uplink synchronous respectively and sets up.
Improve the device of synchronous detecting performance in a kind of synchronization code multi-address division system, include:
Signal receiving device is connected with the antenna that receives upward signal, this signal receiving device with the wireless signal that described antenna receives amplify, filtering, down-conversion, analog-to-digital conversion becomes digital baseband signal;
Matched filter and local uplink synchronous code generating apparatus: this this locality uplink synchronous code generating apparatus produces all uplink synchronous codes that adopt this base station; Described matched filter then with described uplink synchronous code respectively with protection at interval and the antenna data on the uplink pilot time slot interval be shifted relevantly, and obtain the related power sequence;
The signature recognition device, this signature recognition device is adjudicated according to certain predetermined detection condition the related power sequence, and one that finds out power peak maximum wherein as the uplink synchronous signature, and detects time-delay and the amplitude that this uplink synchronous is signed;
Uplink synchronous code related power component look-up table, store the related power sequence of each uplink synchronous code and these all uplink synchronous codes of base station, can find this uplink synchronous code that is pre-stored in the form and the related power sequence of these all uplink synchronous codes of base station according to the uplink synchronous code sequence number that the signature recognition device is determined;
Uplink synchronous code related power adjusting device is according to the time-delay of signature recognition device detected uplink synchronous code with amplitude information is delayed time to the related power component that finds in the described look-up table and the adjustment of amplitude;
Interference blanking unit is used for deducting from the related power sequence related power adjustment result of detected uplink synchronous code;
Related power sequence buffer is stored related power sequence to be detected, is used for doing the circulation synchronous detecting;
The physical access channel arrangement responds uplink synchronous in order successively according to the priority level of signature and signs and distribute corresponding physical access channel;
Detected uplink synchronous signature and data logging plant are noted the uplink synchronous signature of detected power peak maximum in the signature recognition device and time-delay and range parameter, are used for determining the arrangement of physical access channel;
Multiplexer, the related power sequence of when signing identification for the first time matched filter being exported is carried out multiplexing, and the related power sequence after the detected synchronous code of when follow-up identification the reception interference blanking unit being exported of process is eliminated is carried out multiplexing.
Among the present invention, possible uplink synchronous code data segment is at first determined according to uplink pilot time slot position in the base station, all uplink synchronous codes that utilize base station side again are shifted relevant with possible uplink synchronous code data segment respectively, and determine the uplink synchronous code of maximum possible, and in the total correlation power sequence, deduct this uplink synchronous code of determining and all uplink synchronous code related power sequences of base station side, thereby in the total correlation power sequence, eliminate the influence of the uplink synchronous code of determining, utilize identical method that the total correlation power sequence of eliminating after influencing is detected again, up to detecting all uplink synchronous codes.When same synchronous access slot inserted, the present invention can obviously improve the performance of synchronous access as a plurality of synchronous codes, improved the precision of synchronous detecting.The present invention realizes that simply, required hardware cost is lower.
Description of drawings
Fig. 1 is the physical channel wireless frame structure schematic diagram of synchronization code multi-address division system;
Fig. 2 is the uplink pilot time slot structural representation in the radio frames among Fig. 1;
Fig. 3 is a structural representation of the present invention;
Fig. 4 is signaling process figure of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 3, the inventive system comprises signal receiving device 201, matched filter 202, local uplink synchronous code (SYNC_UL) generating apparatus 203, signature recognition device 204, uplink synchronous code related power look-up table 205, uplink synchronous code related power processing unit 206, interference blanking unit 207, related power sequence buffer 208, physical access channel arrangement 209, detected uplink synchronous signature and data logging plant 210 and multiplexer 211, it connects by diagram respectively.Wherein, receiving system 201 is provided with antenna, after antenna receives the up-link wireless signal, converts digital baseband signal to after the processing such as the amplification of process signal receiving device 201, filtering, down-conversion, analog to digital conversion; And the function of local uplink synchronous (SYNC_UL) sign indicating number generating apparatus 203 is to produce the N that adopt this sub-district
SYNC_UL(N
SYNC_ULFor more than or equal to 1 integer, concrete number is decided on concrete system) individual SYNC_UL sign indicating number; 202 of matched filters are used this N
SYNC_ULIndividual SYNC_UL sign indicating number respectively with the uplink pilot time slot interval on antenna data and corresponding protection thereof be shifted relevantly at interval, and obtain the related power sequence, and each related power sequence addition that will obtain obtains the total correlation power sequence; 211 pairs of matched filters of multiplexer 202 output the related power sequence carry out multiplexingly, the related power sequence is cached to related power sequence buffer 208; The related power sequence of buffer memory is adjudicated according to certain predetermined detection condition in 204 pairs of related power sequences of signature recognition device buffer 208, find out a wherein uplink synchronous signature of power peak maximum, and detect the time-delay and the amplitude of this uplink synchronous signature; The signature result of detected uplink synchronous signature and 204 identifications of data logging plant 210 record signature recognition devices; The N that uplink synchronous code related power look-up table 205 finds this uplink synchronous code of being pre-stored in the form 205 and this sub-district to adopt according to detected uplink synchronous signature sequence number
SYNC_ULThe related power sequence of individual uplink synchronous code; Uplink synchronous code related power processing unit 206 is according to the time-delay of signature recognition device 204 detected these uplink synchronous codes and amplitude information is delayed time to the related power that finds in the look-up table 205 and the adjustment of amplitude; Deduct the adjusted related power of detected uplink synchronous code in the related power sequence of interference blanking unit 207 from related power sequence buffer 208; Gating by multiplexer 211 makes the result of related power sequence buffer 208 buffer memory interference blanking units 207; The result of interference components cancellation element 207 also sends to the identification that signature recognition device 204 carries out the uplink synchronous signature of maximum power peak simultaneously; Physical access channel arrangement 209 responds according to the priority level of signing in order successively for the information of detected uplink synchronous signature and data logging plant 210, promptly distributes corresponding physical access channel.
It should be understood by one skilled in the art that above-mentioned each device with functional specification all can realize.For example, interference blanking unit 207 can be realized by subtraction circuit; Uplink synchronous code related power look-up table 205, related power sequence buffer 208 can be realized by common memory device.The realization principle of all the other devices repeats no more.
As shown in Figure 4, method of the present invention specifically may further comprise the steps:
1, after each antenna of base station side receives signal, determine the data segment at uplink synchronous (SYNC_UL) place, detection window comprises protection (GP) and uplink pilot time slot (UpPTS) at interval.Here, data segment comprises L
DataIndividual chip comprises promptly and protecting at interval and the number of chips summation of uplink pilot time slot that length is L
Data* SR sampled point, SR are sample rate, and desirable in the present invention SR=1 is promptly based on the synchronous detecting of single-time sampling.According to different synchronization accuracy requirements, SR also desirable 2,4,8.
2, whether there to be SYNC_UL to insert in order detecting on protection interval and uplink pilot time slot interval, at first to need N with current area
SYNC_UL(N
SYNC_ULFor more than or equal to 1 integer, concrete number decide on concrete system) individual SYNC_UL sign indicating number respectively with protection at interval and the reception of the antenna on uplink pilot time slot interval data be shifted relevantly, obtain the related power sequence; Each antenna of described base station receives the related power sequence of data and forms total correlation power sequence P
Corr_raw
The relevant step that specifically comprises of displacement: a) data on the uplink pilot time slot and corresponding protection thereof are carried out Fourier transform at interval; B) all uplink synchronous codes to base station side carry out Fourier transform; C) with the transformation results that obtains in the step b) respectively with step a) in transformation results carry out dot product respectively, and the dot product result is carried out inverse-Fourier transform.Perhaps, the step that displacement is relevant: a) prior all uplink synchronous codes to base station side carry out Fourier transform, and preserve each transformation results; B) data on the uplink pilot time slot and corresponding protection thereof are carried out Fourier transform at interval; C) invocation step a) in each transformation results respectively with step b) in transformation results carry out dot product respectively, and the dot product result is carried out inverse-Fourier transform.Specifically also can be referring to the application documents that are entitled as " a kind of be used to detect the method that user terminal inserts at random " (China's application, publication number: CNl533199A) or be entitled as application documents (China application, the publication number: CN1595835A) of " a kind of method and apparatus that improves synchronous detecting precision "; The calculating of related power sequence equally can be referring to above-mentioned file.
3, signature identification: according to the preset detection condition to total correlation power sequence P
Corr_rawDetect, if the related power sequence has the item that meets the predetermined detection condition, the data that then corresponding uplink pilot time slot sends are uplink synchronous codes, enter step 4, otherwise enter step 8; Concrete signature recognizer can be referring to the application documents that are entitled as " a kind of be used to detect the method that user terminal inserts at random " (China's application, publication number: CN1533199A) or be entitled as application documents (China application, the publication number: CN1595835A) of " a kind of method and apparatus that improves synchronous detecting precision ".The predetermined detection condition here is: at total correlation power sequence P
Corr_rawEach related power sequence in the positional information of search maximum power value and this power peak, setting signal peak value detection window, this window is included this maximum power peak position; At forward and backward leading window, the lag windwo of being provided with respectively of peak value detection window, whether the difference of judging the average power in maximum power value and leading, the lag windwo in the peak value detection window is greater than setting threshold, then do not have uplink synchronous to insert if not, detect if then carry out access interference; Promptly at first to the identification of signing of corresponding uplink synchronous, whether the detection peak detection window exists the position greater than setting power outward then, access interference does not then take place if do not exist, detected uplink synchronous code is effective, if exist access interference has taken place then, detected uplink synchronous code is invalid.The length of peak value detection window, leading window and lag windwo can be set as the case may be.
4, find out one of the power peak maximum among result's (uplink synchronous code that meets the predetermined detection condition) of the identification of the signature from step 3, and detect its delay parameter and range parameter;
5, find out the corresponding uplink synchronous code that is pre-stored in the look-up table and the N of current area according to the sequence number of the uplink synchronous code that finds in the step 4
SYNC_ULThe related power sequence P of individual SYNC_UL sign indicating number
Corr_det
6, according to detected delay parameter and range parameter in the step 4 to P
Corr_detCarry out the adjustment on timing and the amplitude, obtain P
Corr_det', calculate P
Corr_raw-P
Corr_det', obtain the result of relevant power sequence newly, be designated as P
Corr_min us
7, with related power sequence P
Corr_min usReturning step 3 detects again;
8, judge whether the total correlation power sequence is detected first, if then think do not have uplink synchronous to insert, step finishes; Otherwise the priority level according to detected uplink synchronous code respective user is carried out the physical access channel arrangement, carries out uplink synchronous respectively and sets up.
The present invention is applicable to synchronous CDMA communications system, is particularly useful for TD-SCDMA system in the 3-G (Generation Three mobile communication system) (1.28Mcps TDD and 3.84Mcps TDD), but is applicable to the frequency division multiple access of employing synchronization CDMA and the system of time division multiple access too.Above-mentioned only is description to preferred embodiment of the present invention, so that those of ordinary skills can use or utilize the present invention.It should be understood by one skilled in the art that the method and apparatus that any corresponding synchronous that designs according to inventive concept detects, all should be included in thought of the present invention and the protection range.
Claims (6)
1, improve the method for synchronous detecting performance in a kind of synchronization code multi-address division system, it is characterized in that this method may further comprise the steps:
(1) after each antenna of base station side receives signal, determines the data segment of uplink synchronous code according to the position of uplink pilot time slot;
(2) with all uplink synchronous codes of described base station side respectively with uplink pilot time slot on antenna receive data and corresponding protection thereof and be shifted relevantly at interval, obtain the related power sequence; Each antenna of described base station receives the related power sequence of data and forms total correlation power sequence P
Corr_raw
(3) according to the preset detection condition to total correlation power sequence P
Corr_rawDetect, if the related power sequence has the item that meets the predetermined detection condition, the data that then corresponding uplink pilot time slot sends are uplink synchronous codes, enter step (4), otherwise enter step (8);
(4) in the uplink synchronous code that meets the predetermined detection condition, find out of power peak maximum as uplink synchronous code, and detect its delay parameter and range parameter;
(5) find out the corresponding uplink synchronous code that is pre-stored in the look-up table and the related power sequence P of described all uplink synchronous codes of base station side according to the sequence number of the uplink synchronous code that finds in the step (4)
Corr_det
(6) according to detected delay parameter and range parameter in the step (4) to P
Corr_detCarry out the adjustment on timing and the amplitude, obtain P
Corr_det', calculate P
Corr_raw-P
Corr_det＇ obtains the result of relevant power sequence newly, is designated as P
Corr_min us
(7) with related power sequence P
Corr_min usReturning step (3) detects again;
(8) judge whether the total correlation power sequence is detected first, if then think do not have uplink synchronous to insert, step finishes; Otherwise the priority level according to detected uplink synchronous code respective user is carried out the physical access channel arrangement, carries out uplink synchronous respectively and sets up.
2, improve the method for synchronous detecting performance in the synchronization code multi-address division system according to claim 1, it is characterized in that, the preset detection condition is specially in the described step (3): at total correlation power sequence P
Corr_rawEach related power sequence in the positional information of search maximum power value and this power peak, setting signal peak value detection window, this window is included this maximum power peak position; At forward and backward leading window, the lag windwo of being provided with respectively of peak value detection window, whether the difference of judging the average power in maximum power value and leading, the lag windwo in the peak value detection window is greater than setting threshold, then do not have uplink synchronous to insert if not, detect if then carry out access interference; Promptly at first to the identification of signing of corresponding uplink synchronous, whether the detection peak detection window exists the position greater than setting power outward then, access interference does not then take place if do not exist, detected uplink synchronous code is effective, if exist access interference has taken place then, detected uplink synchronous code is invalid.
3, improve the method for synchronous detecting performance in the synchronization code multi-address division system according to claim 1 and 2, it is characterized in that, displacement is relevant in the described step (2) is specially:
A) data on the uplink pilot time slot and corresponding protection thereof are carried out Fourier transform at interval;
B) all uplink synchronous codes to base station side carry out Fourier transform;
C) with the transformation results that obtains in the step b) respectively with step a) in transformation results carry out dot product respectively, and the dot product result is carried out inverse-Fourier transform.
4, improve the method for synchronous detecting performance in the synchronization code multi-address division system according to claim 1 and 2, it is characterized in that, displacement is relevant in the described step (2) is specially:
A) prior all uplink synchronous codes to base station side carry out Fourier transform, and preserve each transformation results;
B) data on the uplink pilot time slot and corresponding protection thereof are carried out Fourier transform at interval;
C) invocation step a) in each transformation results respectively with step b) in transformation results carry out dot product respectively, and the dot product result is carried out inverse-Fourier transform.
5, improve the method for synchronous detecting performance in the synchronization code multi-address division system according to claim 1 and 2, it is characterized in that the number of the uplink synchronous code of described base station side is the integer more than or equal to 1.
6, improve the device of synchronous detecting performance in a kind of synchronization code multi-address division system, it is characterized in that this device includes:
Signal receiving device is connected with the antenna that receives upward signal, this signal receiving device with the wireless signal that described antenna receives amplify, filtering, down-conversion, analog-to-digital conversion becomes digital baseband signal;
Matched filter and local uplink synchronous code generating apparatus: this this locality uplink synchronous code generating apparatus produces all uplink synchronous codes that adopt this base station; Described matched filter then with described uplink synchronous code respectively with protection at interval and the antenna data on the uplink pilot time slot interval be shifted relevantly, and obtain the related power sequence;
The signature recognition device, this signature recognition device is adjudicated according to certain predetermined detection condition the related power sequence, finds out wherein signing as uplink synchronous of power peak maximum, and detects the time-delay and the amplitude of this uplink synchronous signature;
Uplink synchronous code related power component look-up table, store the related power sequence of each uplink synchronous code and these all uplink synchronous codes of base station, can find this uplink synchronous code that is pre-stored in the form and the related power sequence of these all uplink synchronous codes of base station according to the uplink synchronous code sequence number that the signature recognition device is determined;
Uplink synchronous code related power adjusting device is according to the time-delay of signature recognition device detected uplink synchronous code with amplitude information is delayed time to the related power component that finds in the described look-up table and the adjustment of amplitude;
Interference blanking unit is used for deducting from the related power sequence related power adjustment result of detected uplink synchronous code;
Related power sequence buffer is stored related power sequence to be detected, is used for doing the circulation synchronous detecting;
The physical access channel arrangement responds uplink synchronous in order successively according to the priority level of signature and signs and distribute corresponding physical access channel;
Detected uplink synchronous signature and data logging plant are noted the uplink synchronous signature of detected maximum likelihood in the signature recognition device and time-delay and range parameter, are used for determining the arrangement of physical access channel;
Multiplexer, the related power sequence of when signing identification for the first time matched filter being exported is carried out multiplexing, and the related power sequence after the detected synchronous code of when follow-up identification the reception interference blanking unit being exported of process is eliminated is carried out multiplexing.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100405865C (en) * | 2006-07-19 | 2008-07-23 | 北京天碁科技有限公司 | TD-SCDMA terminal and its same-frequency cell time delay and power detecting method |
| CN101141142B (en) * | 2007-08-09 | 2010-12-29 | 中兴通讯股份有限公司 | Method to reduce leakage checking of uplink synchronous detection |
| CN101174869B (en) * | 2006-11-01 | 2011-06-22 | 中兴通讯股份有限公司 | Ascending pilot frequency transmitting method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR19990052334A (en) * | 1997-12-22 | 1999-07-05 | 서평원 | Multiuser Detection Apparatus and Method of Direct Diffusion Code Division Multiple Access System |
| US6480558B1 (en) * | 1999-03-17 | 2002-11-12 | Ericsson Inc. | Synchronization and cell search methods and apparatus for wireless communications |
| US6665288B1 (en) * | 1999-11-08 | 2003-12-16 | Ericsson Inc. | Method and apparatus for reducing synchronization code interference in CDMA communications systems |
| ES2212744B2 (en) * | 2003-01-10 | 2005-03-16 | Diseño De Sistemas En Silicio, S.A. | SYNCHRONIZATION PROCEDURE IN THE DOMAIN OF TIME AND FREQUENCY OF MULTIPLE EQUIPMENT IN A TRANSMISSION SYSTEM WITH OFDM MODULATION. |
| CN1553601A (en) * | 2003-06-03 | 2004-12-08 | 西门子（中国）有限公司 | Method for eliminating self generated interference in time division duplex system |
| CN1463104A (en) * | 2003-06-18 | 2003-12-24 | 清华大学 | Method for eliminating serial interference utilized in synchronous sode division multiple access (CDMA) system basd on reliability |
| CN100508428C (en) * | 2004-06-29 | 2009-07-01 | 大唐移动通信设备有限公司 | A method and apparatus for increasing synchronous detection precision |
| CN1595834B (en) * | 2004-07-06 | 2010-11-03 | 上海宣普实业有限公司 | Method and apparatus for initial synchronization in CDMA mobile communication system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100405865C (en) * | 2006-07-19 | 2008-07-23 | 北京天碁科技有限公司 | TD-SCDMA terminal and its same-frequency cell time delay and power detecting method |
| CN101174869B (en) * | 2006-11-01 | 2011-06-22 | 中兴通讯股份有限公司 | Ascending pilot frequency transmitting method |
| CN101141142B (en) * | 2007-08-09 | 2010-12-29 | 中兴通讯股份有限公司 | Method to reduce leakage checking of uplink synchronous detection |
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