WO2001020797A1 - Procede de generation de sequences pilotes inverses en duplex a repartition dans le temps - Google Patents

Procede de generation de sequences pilotes inverses en duplex a repartition dans le temps Download PDF

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Publication number
WO2001020797A1
WO2001020797A1 PCT/CN2000/000152 CN0000152W WO0120797A1 WO 2001020797 A1 WO2001020797 A1 WO 2001020797A1 CN 0000152 W CN0000152 W CN 0000152W WO 0120797 A1 WO0120797 A1 WO 0120797A1
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WO
WIPO (PCT)
Prior art keywords
sequence
reverse pilot
gold
time division
generating
Prior art date
Application number
PCT/CN2000/000152
Other languages
English (en)
Chinese (zh)
Inventor
Gengshi Wu
Original Assignee
Huawei Technologies Co., Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd filed Critical Huawei Technologies Co., Ltd
Priority to AU53863/00A priority Critical patent/AU5386300A/en
Publication of WO2001020797A1 publication Critical patent/WO2001020797A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/10—Code generation
    • H04J13/102—Combining codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/004—Orthogonal
    • H04J13/0048—Walsh

Definitions

  • the present invention relates to time division multiplexed communication, and more particularly to a reverse pilot sequence generation method for use in time division duplexing.
  • Time Division Duplex (TDD) mode the uplink transmission often occupies a common time-division pilot channel, enabling the base station to search for all user equipments (UEs) to be accessed during this period.
  • this uplink common pilot is similar to the preamble in frequency division duplex mode (FDD) during the access process.
  • FDD frequency division duplex mode
  • the base station searches for the largest correlation peak using the matching technique to find the current attempted access.
  • the user equipment and during this period, performs multipath search and channel estimation, thereby demodulating the related physical access channel and obtaining information of the user equipment to be accessed.
  • TDD time division duplex
  • Siemens broadband time division duplex
  • TD-SCDMA narrowband code division multiple access
  • the known Gold sequence set is used as the uplink pilot channel, and the base station identifies the Gold sequence sent by the user equipment through the matched filter. Thereby, the user equipment currently trying to access the base station is obtained.
  • UpPTS uplink pilots
  • the uplink pilot of the time division duplex (TDD) mode has a shorter time, and the number of short Gold sequences is small, resulting in insufficient available pilot sequences and the disadvantage of using the Gold sequence.
  • the m-sequence is used as the uplink pilot sequence, there is also a disadvantage that the cross-correlation is poor and the number of sequences is small.
  • the object of the present invention is to provide a method for generating a reverse pilot sequence for time division duplexing in view of the above disadvantages of using the m or Gold sequence for piloting in time division duplexing.
  • the reverse pilot sequence generating method of the present invention includes the following steps:
  • the Walsh sequence is extended in a repeated manner to obtain a sequence r;
  • step C multiplying the sequence r obtained in step A by the sequence r obtained in step B to obtain a codeword sequence h, and the codeword sequence h is used as a reverse pilot sequence.
  • Figure 1 is a schematic view showing the production method of the present invention.
  • Figure 2 is a schematic diagram of the frame structure of TD-SCDMA.
  • Figure 3 - Figure 5 is a schematic diagram showing the change of the mutual change when the user equipment and the base station have different frequency offsets when the Gold sequence is used as the reverse pilot frequency.
  • FIG. 6 to FIG. 8 are schematic diagrams showing changes in cross-correlation when the user equipment and the base station have different frequency offsets when the h sequence generated by the present invention is used as the reverse pilot frequency.
  • the method of the present invention utilizes the properties of the above two, and the Walsh sequence is first extended in a repeated manner to obtain a sequence.
  • the repetition is to extend the Walsh sequence, that is, if the input is x and the number of repetitions is 4, then the output is ⁇ , ⁇ , ⁇ , ⁇ ⁇
  • the Walsh sequence is repeatedly generated to produce a sequence r of the same length as the m or Gold sequence.
  • the sequence k is generated by the m or Gold sequence; the sequence r is multiplied by the obtained sequence k to obtain the codeword sequence h, and the codeword sequence h is used as the reverse pilot sequence.
  • the m or Gold sequence may also be sampled by 2, and the 2 samples are extracted every two elements of the sequence, and the resulting sequence is output.
  • sequence of the m or Gold sequence separated by 2 samples is subjected to positive and negative spreading (indicated by "+-" in Fig. 1), that is, each element in the output sequence after the 2 samples is multiplied by + 1 And one, get two elements, and put these two elements back to the original element position, thus getting a new sequence k whose length is twice the original sequence.
  • sequence h of the positive and negative spread spectrum is multiplied by the sequence r, and the code word sequence h is also obtained, and the code word sequence h is used.
  • code word sequence h is used for the reverse pilot sequence.
  • the length of the Walsh sequence can be 16, 32, 64, 128, 256, etc., depending on the length of the desired pilot sequence, m or Gold sequences of different lengths can be taken.
  • m or Gold sequences of different lengths can be taken.
  • To generate a pilot sequence of length 64 it can be repeated four times with a Walsh sequence of length 16 to obtain an r sequence.
  • the characteristic sequence of the Gold sequence is 1 + ⁇ + ⁇ ⁇ 6 and 1 + ⁇ + ⁇ ⁇ 3 + ⁇ ⁇
  • One of the 64 Gold sequence sets constructed by the two small m sequences of 4+ ⁇ ⁇ 6 is selected, and the corresponding pilot sequence can be generated through the process shown in FIG.
  • the sequence r which is directly repeated by the Walsh sequence is directly multiplied by the m or Gold sequence to obtain the codeword sequence h, and the codeword sequence h is used as the reverse pilot sequence ( Please refer to Figure 1) for the method of this embodiment.
  • the structure in the figure is specified in TD-SCDMA, and the method generated by the present invention can be used in the time division duplex (TDD) protocol of TD-SCDMA, and the DwPTS in FIG. 2 is the former.
  • the GP is a handover protection time slot in the middle of the uplink and downlink transmission
  • the UpPTS is a reverse pilot sequence, wherein the length of the reverse pilot sequence is 64 chips.
  • the cross-correlation mean of these anti-propagation sequences is: 0 when the offset is 0, and within 1 code when the offset is ( 8 samples for one chip) 0.0144, the offset is 0.0271 when it is within 2 chips, and the offset is 0.0300 when it is within 3 chips.
  • the cross-correlation values of the pilot sequences are smaller than the cross-correlation values of the Gold sequence, especially when one chip is within, the recommended cross-correlation average of the sequence is 4 dB smaller than the cross-correlation value of the Gold sequence.
  • the pilot sequence of this nature is particularly suitable for synchronous code division multiple access (CDMA) systems.
  • the cross-correlation sequence generated by the method of the present invention changes with the frequency offset, and the cross-correlation energy changes when the frequency offset is 400 hz.
  • the output of the correlated energy basically kept a small value.
  • the sequence r obtained by repeating the Walsh sequence is multiplied by the sequence k generated by the m or Gold sequence, thereby obtaining a reverse pilot sequence. Therefore, the generation method of the reverse pilot sequence of the present invention has the following advantages as compared with the m or Gold sequence for time division duplexing:
  • the pilot sequence has a lower cross-correlation, and the average cross-correlation is less than 30db than the autocorrelation, especially within one chip, and the cross-correlation is reduced by 4db compared with the original Gold sequence. the above.
  • the base station can use various flexible detection methods, such as coherent accumulation, non-coherent accumulation, and differential detection, etc., without increasing the cross-correlation value.

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

Abstract

La présente invention concerne un procédé qui permet de générer des séquences pilotes inverses en duplex à répartition dans le temps. Le procédé consiste à répéter la séquence de Walsh puis à la multiplier par une suite de nombres m ou de nombres d'or échantillonnée 1 sur 2 suivant le cas en spectre étalé des fréquences positives et négatives de façon à produire une séquence pilote inverse. Comparativement à la séquence de nombre m ou de nombres d'or en duplex à répartition dans le temps, la séquence pilote inverse présente l'avantage d'une intercorrélation plus faible et d'une combinatoire admettant un plus grand nombre de séquences pilotes orthogonales. Ce procédé permet d'améliorer la qualité de l'accès aléatoire et l'efficacité de la détection d'une station de base qui reçoit les dispositifs d'un utilisateur.
PCT/CN2000/000152 1999-09-16 2000-06-12 Procede de generation de sequences pilotes inverses en duplex a repartition dans le temps WO2001020797A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU53863/00A AU5386300A (en) 1999-09-16 2000-06-12 Method for generating reverse pilot sequence of time division duplex

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN 99116883 CN1119880C (zh) 1999-09-16 1999-09-16 移动通信系统中移动台和基站建立初始连接的方法
CN99116883.6 1999-09-16

Publications (1)

Publication Number Publication Date
WO2001020797A1 true WO2001020797A1 (fr) 2001-03-22

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Application Number Title Priority Date Filing Date
PCT/CN2000/000152 WO2001020797A1 (fr) 1999-09-16 2000-06-12 Procede de generation de sequences pilotes inverses en duplex a repartition dans le temps

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CN (1) CN1119880C (fr)
AU (1) AU5386300A (fr)
WO (1) WO2001020797A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018142206A1 (fr) * 2017-02-06 2018-08-09 Telefonaktiebolaget Lm Ericsson (Publ Combinaison de séquences de synchronisation de longueurs différentes
WO2019047060A1 (fr) * 2017-09-06 2019-03-14 Zte Corporation Procédé et dispositif de transmission de séquence de pilotes

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101166362B (zh) * 2006-10-20 2011-03-16 华为技术有限公司 发起和检测反向接入的方法及设备
US8208427B2 (en) * 2009-07-10 2012-06-26 Qualcomm Incorporated Multiple peer-to-peer signaling
CN101959289B (zh) * 2009-07-13 2013-03-27 重庆无线绿洲通信技术有限公司 周期多相互补序列集的生成方法
CN111147180B (zh) * 2018-11-05 2021-03-02 北京大学 一种伪随机长码的生成方法

Citations (3)

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Publication number Priority date Publication date Assignee Title
CN1196842A (zh) * 1995-07-26 1998-10-21 艾利森公司 用于cdma信号正交化的方法和设备
WO1998049790A1 (fr) * 1997-04-30 1998-11-05 Motorola Inc. Procede et dispositif d'emission et de reception d'un debit de transmission dans un systeme de communication amdc
WO1999013605A1 (fr) * 1997-09-08 1999-03-18 Qualcomm Incorporated Procede et appareil destines a produire des faisceaux ponctuels, des secteurs et des picocellules orthogonaux

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1196842A (zh) * 1995-07-26 1998-10-21 艾利森公司 用于cdma信号正交化的方法和设备
WO1998049790A1 (fr) * 1997-04-30 1998-11-05 Motorola Inc. Procede et dispositif d'emission et de reception d'un debit de transmission dans un systeme de communication amdc
WO1999013605A1 (fr) * 1997-09-08 1999-03-18 Qualcomm Incorporated Procede et appareil destines a produire des faisceaux ponctuels, des secteurs et des picocellules orthogonaux

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018142206A1 (fr) * 2017-02-06 2018-08-09 Telefonaktiebolaget Lm Ericsson (Publ Combinaison de séquences de synchronisation de longueurs différentes
CN110268649A (zh) * 2017-02-06 2019-09-20 瑞典爱立信有限公司 组合不同长度的同步序列
TWI714822B (zh) 2017-02-06 2021-01-01 瑞典商Lm艾瑞克生(Publ)電話公司 組合不同長度之同步序列
US11044133B2 (en) 2017-02-06 2021-06-22 Telefonaktiebolaget Lm Ericsson (Publ) Combining synchronization sequences of different lengths
CN110268649B (zh) * 2017-02-06 2021-10-29 瑞典爱立信有限公司 组合不同长度的同步序列
WO2019047060A1 (fr) * 2017-09-06 2019-03-14 Zte Corporation Procédé et dispositif de transmission de séquence de pilotes
US11546075B2 (en) 2017-09-06 2023-01-03 Zte Corporation Method and device for pilot sequence transmission

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CN1119880C (zh) 2003-08-27
AU5386300A (en) 2001-04-17
CN1289193A (zh) 2001-03-28

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