WO2011157088A1 - Procédé et appareil de confirmation de code synchrone de liaison descendante de données échantillonnées individuelles en td-scdma - Google Patents

Procédé et appareil de confirmation de code synchrone de liaison descendante de données échantillonnées individuelles en td-scdma Download PDF

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Publication number
WO2011157088A1
WO2011157088A1 PCT/CN2011/073833 CN2011073833W WO2011157088A1 WO 2011157088 A1 WO2011157088 A1 WO 2011157088A1 CN 2011073833 W CN2011073833 W CN 2011073833W WO 2011157088 A1 WO2011157088 A1 WO 2011157088A1
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Prior art keywords
correlation
energy value
value
comparison
values
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PCT/CN2011/073833
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English (en)
Chinese (zh)
Inventor
徐鑫昌
程健
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中兴通讯股份有限公司
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Publication of WO2011157088A1 publication Critical patent/WO2011157088A1/fr

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    • 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
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to a downlink synchronization code confirmation method and apparatus for single-sample data in Time Division-Synchronous Code Division Multiple Access (TD-SCDMA).
  • TD-SCDMA Time Division-Synchronous Code Division Multiple Access
  • initial cell search is a very critical process. After the user terminal (UE) is powered on, it must search for a suitable cell as soon as possible, and then obtain more detailed information of the cell or information of the neighboring cell, so as to log in to the cell and use the network service, such as listening for a page or initiating a call.
  • UE user terminal
  • the initial cell search process mainly includes: searching for a downlink pilot time slot (DwPTS, Downlink Pilot Time Slot), a downlink synchronization code (SYNC_DL, Synchronous Code of Downlink), a scrambling code, and a basic training sequence (midamble).
  • DwPTS Downlink Pilot Time Slot
  • SYNC_DL Synchronous Code of Downlink
  • scrambling code a basic training sequence
  • basic training sequence basic training sequence
  • the main object of the present invention is to provide a downlink synchronization code acknowledgment method and apparatus for singular data in TD-SCDMA, which aims to ensure cell search performance while saving hardware resources.
  • the invention provides a downlink synchronization code confirmation method for single sample data in TD-SCDM A, which comprises the following steps:
  • the correlation peaks of the obtained correlation peaks larger than the first preset threshold are reserved, and the corresponding downlink synchronization codes and the positions of the downlink synchronization codes are recorded.
  • the foregoing respectively processes the correlation energy values of each of the 32 sets of related energy values, and obtains corresponding correlation peaks, including:
  • Corresponding processing is performed according to the result of the comparison to obtain a correlation peak.
  • the foregoing processing is performed according to the result of the comparison to obtain a correlation peak, which is:
  • the correlation value corresponding to the maximum correlation energy value is recorded as a correlation peak
  • the maximum correlation energy value is less than the first comparison energy value or the second comparison energy value And performing a shift addition calculation on each correlation value corresponding to the maximum correlation energy value, obtaining a processed correlation value, and calculating a correlation energy value of each correlation value after the processing;
  • the correlation value corresponding to the largest correlation energy value among the correlation energy values of the correlation values of each correlation value is recorded as a correlation peak.
  • the number of correlation peaks greater than the first preset threshold among the correlation peaks obtained by the above reservation is less than or equal to 8.
  • the received subframe data is data in a range of one subframe or single-sample data in a determined range obtained by detecting a feature window in one subframe.
  • the present invention further provides a downlink synchronization code confirming apparatus for single-sample data in TD-SCDMA, the apparatus comprising: a correlation value calculation module, a correlation energy value calculation module, a correlation peak calculation module, and a downlink synchronization code recording module; ,
  • a correlation value calculation module configured to perform sliding correlation calculation on the received subframe data and the local 32 downlink synchronization codes, to obtain 32 sets of correlation values
  • a correlation energy value calculation module configured to calculate an energy value of each of the 32 sets of correlation values obtained by the correlation value calculation module, and obtain 32 sets of correlation energy values
  • the correlation peak calculation module respectively processes the correlation energy values of each of the 32 sets of correlation energy values obtained by the correlation energy value calculation module, and obtains corresponding correlation peaks;
  • the downlink synchronization code recording module retains a correlation peak greater than the first preset threshold among the correlation peaks obtained by the correlation peak calculation module, and records the corresponding downlink synchronization code and its position.
  • the correlation peak calculation module includes: a comparison energy value acquisition unit, a comparison unit, and a processing unit; wherein
  • a comparison energy value obtaining unit configured to multiply the correlation energy values of adjacent ones of the largest correlation energy values of the set of related energy values obtained by the correlation value calculation module by a second preset threshold, and obtain The product of the first comparison energy value and the second comparison energy value are respectively recorded;
  • a comparing unit configured to obtain the maximum correlation energy value and the comparison energy value respectively Comparing the first comparison energy value and the second comparison energy value obtained by the unit;
  • a processing unit configured to perform corresponding processing according to the comparison result of the comparing unit to obtain a correlation peak.
  • the processing unit includes: a first processing subunit, a shift addition computing subunit, and a second processing subunit; wherein
  • a first processing subunit configured to record a correlation value corresponding to the largest correlation energy value as a correlation peak when the maximum correlation energy value is greater than or equal to the first comparison energy value and the second comparison energy value;
  • a shift addition calculation subunit configured to: when the maximum correlation energy value is smaller than the first comparison energy value or the second comparison energy value, compare each correlation value corresponding to the maximum correlation energy value Performing a shift addition calculation to obtain a processed correlation value, and calculating a correlation energy value of each correlation value after processing;
  • the second processing sub-unit is configured to record, as the correlation peak, a correlation value corresponding to the largest correlation energy value among the correlation energy values of the processed correlation values calculated by the shift addition calculation sub-unit.
  • the downlink synchronization code recording module retains less than or equal to 8 correlation peaks greater than the first preset threshold.
  • the subframe data received by the correlation value calculation module is data within a sub-frame range or single-sample data within a determined range obtained by detecting the feature window in one sub-frame.
  • the method and device for confirming the downlink synchronization code of the single sample data in the TD-SCDM A of the present invention reduces the calculation amount and saves the hardware resources while ensuring the effective cell search performance, and can well adapt to the TD-SCDMA system. Cell search. DRAWINGS
  • FIG. 1 is a schematic diagram of a cell initial search process in a prior art TD-SCDMA
  • FIG. 2 is a schematic flow chart of an embodiment of a method for confirming a downlink synchronization code of a single data in TD-SCDMA according to the present invention
  • 3 is a schematic diagram of a frame structure of a TD-SCDM A of the present invention
  • FIG. 4 is a schematic flow chart of separately processing each group of related energy values in the above embodiment, and obtaining corresponding correlation peaks;
  • Fig. 5 is a schematic diagram of correlation peaks before and after shift addition processing in the absence of sample deviation
  • Fig. 6 is a diagram showing correlation peaks before and after shift addition processing in the case of l/2chip sample deviation
  • FIG. 7 is a schematic diagram showing the structure of an embodiment of a downlink synchronization code confirming apparatus for singular data in TD-SCDMA according to the present invention.
  • FIG. 8 is a schematic structural diagram of a correlation peak calculation module in the embodiment shown in FIG. 7.
  • FIG. 9 is a schematic structural diagram of a processing unit in the embodiment shown in FIG. detailed description
  • the prior art reduces performance loss by storing multiple data samples and performing multiple sliding correlations. Will increase the overhead of the hardware. In the present invention, only a single data is stored, which not only ensures the performance of the cell search, but also saves hardware resources and multiple related operations.
  • FIG. 2 is a flow chart showing an embodiment of a method for confirming a downlink data synchronization code of a single sample data in the TD-SCDM A of the present invention.
  • the method for confirming the downlink synchronization code of the single sample data in the TD-SCDM A in this embodiment may mainly include the following steps: Off calculation, and obtaining 32 sets of correlation values;
  • the received sub-frame data is data within a sub-frame range or single-sample data within a determined range obtained by detecting the feature window in one sub-frame.
  • FIG. 3 which is a schematic diagram of a subframe structure of the TD-SCDMA
  • the subframe of the TD-SCDM A includes a time slot 0 (TS0, Time slot 0), a guard time slot (GP, Guard Period), a Sync_DL, and an uplink synchronization code.
  • Sync_UL Synchronous Code of Uplink
  • the method of establishing a "feature window" by using the power shape of the received signal may first perform coarse synchronization to obtain the approximate position of the DwPTS, and then perform sliding correlation calculation on the subframe data.
  • the received subframe data may be directly subjected to sliding correlation calculation with the local 32 downlink synchronization codes without performing any processing on the received subframe data.
  • data that has undergone coarse synchronization via the "feature window" requires fewer scan-related calculations.
  • Step S11 Calculate energy values of each of the 32 sets of correlation values, and obtain 32 sets of related energy values
  • Step S12 processing the correlation energy values of each group separately, and obtaining corresponding correlation peaks
  • Each set of correlation energy of the 32 sets of correlation energy values obtained in step S11 is processed, and a corresponding correlation peak is obtained.
  • Step S13 Keep correlation peaks larger than the first preset threshold, and record corresponding downlink synchronization codes and locations of the downlink synchronization codes.
  • the first preset threshold is set in advance, and the first preset threshold may be set according to requirements of the end user or system performance, and is not limited herein.
  • a correlation peak greater than the first preset threshold is reserved, and the corresponding downlink synchronization code and its position are recorded. Based on subsequent scrambling codes and basic training sequence codes, the correlation peaks are generally retained at a maximum of eight. If the retained correlation peak is 0, then return to step S10; if the retained correlation peak value is greater than 8, the maximum 8 correlation peaks are retained.
  • step S12 may further include the following steps: Step S121, multiplying the correlation energy values on the adjacent sides of the largest correlation energy value Pmax of the 32 sets of correlation energy values by the second preset threshold, and recording the obtained products as the first comparison energy value P1 and Second comparison energy value P2;
  • Step S122 Comparing the maximum correlation energy value Pmax with the first comparison energy value P1 and the second comparison energy value P2, respectively, determining whether the maximum correlation energy value Pmax is greater than the first comparison energy value P1, and the second Comparing the energy value P2, if yes, go to step S123, if not, go to step S124;
  • Step S123 Record the correlation value corresponding to the largest correlation energy value Pmax as the correlation peak value; Step S124, perform shift addition calculation on each correlation value of the same group, obtain the processed correlation value, and calculate the correlation value after the processing.
  • Related energy value
  • the same group refers to a correlation value group in which the correlation value corresponding to the largest correlation energy value Pmax is located.
  • Step S125 Record the correlation value corresponding to the maximum correlation energy value Pmax' among the correlation energy values of the correlation values after the processing as the correlation peak.
  • the feature window detection in the present invention uses a single data sample and has a length of 128 chips (chip).
  • the data obtained by the feature window detection includes 64 chips of the downlink synchronization code sequence and data of 32 chips before and after.
  • each downlink synchronization code has a length of 64 chips.
  • the downlink synchronization code is separately recorded as Sync_DL(0), Sync_DL(1), Sync_DL(2) ... Sync_DL(31), and the data of length 128 chips is respectively subjected to sliding correlation calculation with 32 downlink synchronization codes to obtain 32.
  • Group related values each group includes 64 correlation values.
  • the maximum correlation energy value is recorded as Pmax, and the second preset threshold is preferably 6.25.
  • the two correlation energy values adjacent to Pmax are selected and multiplied by the second preset threshold to obtain a first comparison energy value Pl and a second comparison energy value P2, respectively.
  • the maximum correlation energy value Pmax is compared with the first comparison energy value P1 and the second comparison energy value P2.
  • Pmax>Pl and Pmax>P2 the correlation value corresponding to the largest correlation energy value Pmax is recorded as the correlation peak.
  • the 64 correlation values of the group corresponding to the correlation value of the largest correlation energy value Pmax are shifted forward or backward by 1 bit, and the original 64 correlation values are added to the true values of the shifted correlation values to obtain The 64 correlation values after processing, and calculate the correlation energy values of the 64 correlation values after processing.
  • the correlation value of the maximum correlation energy value Pmax' among the correlation energy values obtained after the corresponding processing is recorded as the correlation peak.
  • the 32 correlation peaks are compared with the first preset threshold, and the retention is greater than the first
  • a correlation peak of a preset threshold is recorded, and a corresponding downlink synchronization code and its position are recorded for subsequent scrambling code and identification of the basic training sequence code.
  • Reserved greater than the first preset gate The number of limited correlation peaks is preferably eight. If the retained correlation peak is 0, then the feature window detection is returned, and the new data is re-accepted; if the retained correlation peak is greater than 8, the maximum 8 correlation peaks are retained.
  • Fig. 5 is a schematic diagram showing correlation peaks before and after shift addition processing in the absence of sample deviation.
  • FIG. 5A in the case of no sample deviation, only one correlation peak obtained after the sliding correlation calculation is more prominent.
  • FIG. 5B in the case of no sample deviation, after the sliding correlation calculation, the correlation peak obtained after the shift addition processing is more prominent, and the signal-to-noise ratio relative shift true value is added. The previous signal to noise ratio is lower. Therefore, in the case of no sample deviation, no shift addition processing is required.
  • Fig. 6 is a diagram showing the correlation peaks before and after the shift addition processing in the case of the l/2chip sample deviation.
  • the correlation peaks obtained by only the sliding correlation calculation are more prominent.
  • the correlation peak obtained by the shift correlation process and then the shift correlation process is more prominent. Therefore, in the case of l/2chip sample deviation, the correlation peak obtained after the shift addition process can reach the correlation peak obtained when there is no sample deviation.
  • the downlink synchronization code confirmation method for the single sample data in the TD-SCDMA of the invention reduces the calculation amount and saves the hardware resources while ensuring the effective cell search performance, and can well adapt to the cell of the TD-SCDM A system. search for.
  • Fig. 7 is a block diagram showing an embodiment of a downlink synchronization code confirming apparatus for singular data in TD-SCDMA according to the present invention.
  • the device for verifying the downlink synchronization code of the singular data in the TD-SCDMA of the present embodiment includes: a correlation value calculation module 10, configured to perform sliding correlation calculation between the received subframe data and the local 32 downlink synchronization codes, to obtain 32 groups.
  • a correlation value calculation module 10 configured to perform sliding correlation calculation between the received subframe data and the local 32 downlink synchronization codes, to obtain 32 groups.
  • the correlation energy value calculation module 20 is configured to calculate 32 groups obtained by the correlation value calculation module 10 The energy value of each correlation value in the correlation value, obtaining 32 sets of related energy values;
  • the correlation peak calculation module 30 respectively processes the correlation energy values of each of the 32 sets of correlation energy values obtained by the correlation energy value calculation module 20, and obtains corresponding correlation peaks; the downlink synchronization code recording module 40 retains correlation
  • the correlation peak obtained by the peak calculation module 30 is greater than the correlation peak of the first preset threshold, and records the corresponding downlink synchronization code and the location of the downlink synchronization code.
  • the sub-frame data received in the correlation value calculation module 10 is data within a sub-frame range or data within a determined range obtained by detecting a feature window in one sub-frame.
  • the method of establishing the "feature window" by using the power shape of the received signal first performs coarse synchronization to obtain the approximate position of the DwPTS, and then performs sliding correlation calculation on the sub-frame data.
  • the received subframe data may be directly subjected to sliding correlation calculation with the local N downlink synchronization codes without performing any processing on the received subframe data.
  • data that has been coarsely synchronized via the "feature window" requires fewer scan-related calculations.
  • the first preset threshold in the downlink synchronization code recording module 40 can be set according to the requirements of the end user or the performance of the system, and is not limited herein.
  • a correlation peak greater than the first preset threshold is reserved, and the corresponding downlink synchronization code and its position are recorded. Based on subsequent scrambling codes and basic training sequence codes, the correlation peaks are generally retained at a maximum of eight. If the retained correlation peak is 0, the correlation value calculation module 10 re-receives the new data and performs the calculation of the correlation value; if the retained correlation peak is greater than 8, the maximum 8 correlation peaks are retained.
  • the correlation peak calculation module 30 may include: a comparison energy value acquisition unit 31, a comparison unit 32, and a processing unit 33;
  • the comparison energy value obtaining unit 31 is configured to multiply the correlation energy values of the adjacent sides of the largest correlation energy value by the second preset threshold respectively, and record the obtained products as the first comparison energy value, respectively. Second, compare energy values;
  • the comparing unit 32 is configured to compare the maximum correlation energy value with the first comparison energy value and the second comparison energy value obtained by the comparison energy value obtaining unit 31, respectively;
  • the processing unit 33 is configured to perform corresponding processing according to the comparison result of the comparing unit 32 to obtain a correlation peak.
  • the correlation value corresponding to the maximum correlation energy value is recorded as a correlation peak.
  • the processing unit 33 may include:
  • the first processing sub-unit 331 is configured to record the correlation value corresponding to the maximum correlation energy value as a correlation peak when the maximum correlation energy value is greater than or equal to the first comparison energy value and the second comparison energy value ;
  • the shift addition calculation sub-unit 332 is configured to: when the maximum correlation energy value is smaller than the first comparison energy value or the second comparison energy value, correlate the correlation values corresponding to the maximum correlation energy value The value is subjected to shift addition calculation to obtain the processed correlation value, and the correlation energy value of each correlation value after processing is calculated;
  • the second processing sub-unit 333 is configured to record, as the correlation peak, a correlation value corresponding to the largest correlation energy value among the correlation energy values of the processed correlation values obtained by the shift addition calculation sub-unit 332.
  • the downlink synchronization code confirming apparatus for singular data in the TD-SCDMA of the invention reduces the calculation amount and saves hardware resources while ensuring effective cell search performance, and can well adapt to the cell of the TD-SCDM A system. search for.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention porte sur un procédé et un appareil de confirmation de code synchrone de liaison descendante de données échantillonnées individuelles en TD-SCDMA. Le procédé de confirmation de code synchrone de liaison descendante consiste à : réaliser un calcul de corrélation glissante sur les données de sous-trame reçues et les 32 codes synchrones de liaison descendante locaux, et obtenir 32 ensembles de valeurs de corrélation ; calculer la valeur de puissance de chaque valeur de corrélation parmi lesdits 32 ensembles de valeur de corrélation, et obtenir 32 ensembles de valeurs de puissance de corrélation ; traiter chaque ensemble de valeurs de puissance de corrélation parmi lesdits 32 ensembles de valeurs de puissance de corrélation respectivement, et obtenir des valeurs de pic de corrélation correspondantes ; réserver les valeurs de pic de corrélation qui sont supérieures au premier seuil préréglé parmi les valeurs de pic de corrélation obtenues, et enregistrer le code synchrone de liaison descendante correspondant et son emplacement. Le procédé et l'appareil de confirmation du code synchrone de liaison descendante en TD-SCDMA de la présente invention réduisent la complexité des calculs et économisent des ressources matérielles tout en garantissant des performances de recherche de cellule efficaces, et peuvent bien s'adapter à la recherche de cellule du système TD-SCDMA.
PCT/CN2011/073833 2010-06-13 2011-05-09 Procédé et appareil de confirmation de code synchrone de liaison descendante de données échantillonnées individuelles en td-scdma WO2011157088A1 (fr)

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CN106301652B (zh) * 2016-08-15 2018-03-27 中国船舶重工集团公司第七二二研究所 一种基于连续相位调制信号相位变化特征的码元同步方法
CN113078937B (zh) * 2021-03-19 2023-04-07 四川航天神坤科技有限公司 一种tdd体制下的数据链下行链路的捕获方法及其系统

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