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WO2007000079A1 - Procédé de configuration et de démodulation de codes brouillés multiples dans un système cdma - Google Patents

Procédé de configuration et de démodulation de codes brouillés multiples dans un système cdma Download PDF

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Publication number
WO2007000079A1
WO2007000079A1 PCT/CN2005/000939 CN2005000939W WO2007000079A1 WO 2007000079 A1 WO2007000079 A1 WO 2007000079A1 CN 2005000939 W CN2005000939 W CN 2005000939W WO 2007000079 A1 WO2007000079 A1 WO 2007000079A1
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WO
WIPO (PCT)
Prior art keywords
code
scrambling
user
scrambling codes
cell
Prior art date
Application number
PCT/CN2005/000939
Other languages
English (en)
Chinese (zh)
Inventor
Zhaohua Zeng
Ping Li
Hai Jiang
Original Assignee
Zte Corporation
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 Zte Corporation filed Critical Zte Corporation
Priority to CN2005800487562A priority Critical patent/CN101133581B/zh
Priority to PCT/CN2005/000939 priority patent/WO2007000079A1/fr
Publication of WO2007000079A1 publication Critical patent/WO2007000079A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/16—Code allocation

Definitions

  • the present invention relates to a method for configuring a plurality of scrambling codes in a cell to increase system capacity in a system, and is particularly suitable for a multi-scrambling code configuration method in a TD-SCDMA system in the field of mobile communications.
  • the method of the present invention can also be applied to all CDMA systems in the field of mobile communications, and is particularly suitable for TDD-CDMA systems and all SCDMA systems. Background technique
  • a multiple access system is usually constructed by using one or several combinations of frequency division (FDMA), time division (TOMA) or code division (CDMA) characteristics of radio resources, for a large number of mobile users.
  • FDMA frequency division
  • TOMA time division
  • CDMA code division
  • 3G mobile system with CDMA as its main feature the same frequency network coverage is usually achieved by configuring one scrambling code for each cell (different adjacent cell scrambling codes).
  • the wireless resources occupied by different users are different, which greatly limits the system bandwidth utilization and limits the user capacity in the unit frequency band.
  • any introduction of wireless resource independent features will bring about a significant increase in frequency band utilization.
  • TD-SCDMA allocates resources in FDMA/TDMA/CDMA mode, and its frequency band utilization is far from Other systems.
  • the data on the channel is subjected to spreading and scrambling.
  • the object of the present invention is to provide a multi-scrambling code configuration in a CDMA system and its associated demodulation method, which is fully beneficial.
  • any multi-antenna system especially the spatial division (SOMA) feature brought by multiple antennas in the TD-SCDMA system, multiple scrambling codes and their corresponding channel estimation and joint detection methods are simultaneously configured in the same cell, and full consideration is given.
  • SOMA spatial division
  • SDMA Secure Digital Multi-access technology
  • the user channelization code resources are fully multiplexed, thereby multiplying the system capacity and improving the frequency band utilization.
  • Multi-scrambling code configuration in a CDMA system and its associated demodulation method In a multi-antenna system, the system capacity is increased by configuring a multi-scrambling code, which includes - a), configuring multiple scrambling codes per cell, each scrambling code
  • a multi-scrambling code which includes - a
  • multiple scrambling codes per cell each scrambling code
  • the method for generating the user training sequence is consistent with the current TD protocol, except that when the multi-scrambling code is likely to occur, the channel impulse response window width of each user becomes shorter.
  • the method further includes:
  • the system groups the users served by the cell, the number of groups is equal to the number of scrambling codes, and each group of users allocates a channelization code according to a conventional orthogonal variable spreading factor code method;
  • N is greater than or equal to 1 and less than or equal to the scrambling code of the code group.
  • G matrix is a cyclic right shift matrix consisting of a basic Midamble code
  • h is the user's channel impulse response
  • n is Gaussian white noise
  • the method further includes: ⁇ using the following method to perform channel estimation: using a basic Midamble code, a total of NK voice users, K is the number of users using one scrambling code, for counting natural numbers, each user's
  • the channel estimation window length W is reduced to ⁇ .
  • the method wherein the method is applied to a TD-SCDMA system, and further includes the step of assigning a plurality of scrambling codes:
  • a total of 128 scrambling codes are defined, and are divided into 32 groups, each of which has 4 scrambling codes. 4 scrambling codes in the group are used for cross correlation;
  • the method further includes: a channel estimation step for multiple scrambling codes:
  • the method further includes a joint detection step of multiple scrambling codes - demodulating multi-user joint detection data of multiple scrambling codes, specifically, using respective spreading spread scrambling codes of the user and after passing through the channel
  • the processed channel impulse response fi generates a matrix A, which demodulates the user data: wherein the matrix A is a matrix composed of a convolution vector of each user spread spectrum scrambling code sequence and a channel impulse response using a plurality of scrambling codes, To ensure normal demodulation, it needs to be satisfied:
  • the number of antennas is Ka ⁇ N.
  • the multi-scrambling code configuration and related demodulation method in a CDMA system utilizes any multi-antenna system, especially the spatial division (SDMA) characteristic brought by multiple antennas in the TD-SCDMA system, A specific radio resource configuration method and corresponding demodulation technology are adopted to re-allocate the scrambling code resources, and multiple scrambling codes are used in one cell, compared with a scrambling code corresponding to an existing cell.
  • the method can greatly improve the user capacity of the system, improve the frequency band utilization, and save frequency resources.
  • FIG. 1 is a structural diagram of a system transmission matrix A of the method of the present invention, A is composed of the same V block;
  • FIG. 2 is a structural diagram of the block V shown in FIG. 1, and V is a composite spread scrambling code volume of each user.
  • the b-vector obtained by the accumulative channel impulse response, the different blocks in the picture represent the b-vectors obtained by using the same spreading code for different scrambling codes;
  • 3(a) and (b) are respectively schematic diagrams of system signal transmission and signal reception demodulation corresponding to the present invention. detailed description
  • 128 scrambling codes are defined and divided into 32 groups, each of which has 4 scrambling codes.
  • the prior art protocol only supports only one scrambling code per cell. .
  • the SDMA characteristics brought by the use of multiple antennas can be fully utilized, and the system capacity can be improved by configuring a multi-scrambling code, specifically: each cell is configured with multiple scrambling codes;
  • the method and quantity of the spreading code generation under each scrambling code are consistent with the conventional method;
  • the generation method of the user training sequence is consistent with the current TD protocol, and the only difference is that the channel impulse response of each user may be caused by the multi-scrambling code.
  • the window width becomes shorter, but this has little effect in the urban environment.
  • the method of user channel impact window width dynamic allocation can also be adopted to solve the problem that the window width may be insufficient, and the technical content of this aspect is adopted. It is also within the scope of protection of this patent.
  • the users served by the cell are grouped, the number of groups is equal to the number of scrambling codes, and each group of users allocates a channelization code according to a conventional orthogonal variable spreading factor of 0 VSF code.
  • the data is processed at the transmitting end, spread spectrum, scrambling (packet scrambling), modulation and raised cosine filtering, and transmitted through the air interface, equivalent to over the wireless channel.
  • the training sequence received signal is separated from the received data, and channel estimation and channel post-processing for each user are completed.
  • the received training sequence can be expressed as
  • G matrix is a cyclic right shift matrix consisting of a basic Midamble code
  • h is the user's channel impulse response
  • n is Gaussian white noise
  • the present invention can use the following method for channel estimation: Using a basic Midamble code, a total of NK voice users, K To use the number of users of one scrambling code, the channel estimation window length w of each user is reduced to ⁇ .
  • d is the column vector composed of the symbols of all users.
  • A [A kl A k2 LA Ka ]', Ka is the number of antennas, Ka ⁇ N (5) Demodulation of user data,
  • a to is a block diagonal matrix, the block to can be expressed as
  • 3 ⁇ 4 is a matrix consisting of the k-th user's spread spectrum scrambling code composite sequence of the first scrambling code, w is Use the first
  • the matrix consisting of the k-th users of the k-th users of the spread spectrum of the scrambling code is the channel impulse response of the kth user using the Nth scrambling code.
  • the method of the present invention is a scheme of using multiple scrambling codes in one cell, and a method of channel estimation and joint detection in this case, as shown in Figs. 3(a) and (b), which includes the following Steps:
  • the first step In the TD-SCDMA system, a total of 128 scrambling codes are defined and divided into 32 groups, each of which has 4 scrambling codes, and the four scrambling codes in the selected group are mutually Correlation.
  • Step 2 The scrambling code with small cross-correlation is preferentially selected as the scrambling code used by the cell, and the value of the number of scrambling codes N is 2 ⁇ N ⁇ 4.
  • Step 1 Generate a G matrix.
  • a cyclic right shift matrix G consisting of a basic Midamble code, assuming that N scrambling codes are simultaneously used in one cell, the number of users is increased by N times, a total of NK voice users, and the channel estimation window length W of each user is reduced to
  • ⁇ , K is the number of users using a scrambling code.
  • Step 2 Present the training sequence of the received data for channel estimation.
  • the estimated channel post-processing, the retention greater than the decision threshold, is less than the decision threshold is set to zero.
  • Step 3 Obtain the channel impulse response for each user.
  • Multi-user joint detection data demodulation of multiple scrambling codes specifically using user's respective spread spectrum scrambling code and channel post-processing channel impulse response generation matrix A to demodulate user data:
  • the matrix A is a matrix composed of a convolution vector of each user spread spectrum scrambling code and a channel impulse response using a plurality of scrambling codes. To ensure normal demodulation, it is necessary to satisfy: the number of antennas Ka ⁇ N.
  • the data is processed at the transmitting end, spread spectrum, scrambling, modulation, and raised cosine filtering, and transmitted through the antenna.
  • the training sequence for receiving data is proposed for channel estimation, and the data portion is subjected to joint detection and demodulation by multiple users to complete data separation.
  • the training sequence received signal is separated from the received data, and channel estimation and channel post-processing for each user are completed.
  • the received training sequence can be expressed as
  • G matrix is a cyclic right shift matrix consisting of a basic Midamble code
  • h is the user's channel impulse response
  • n is Gaussian white noise
  • the power of each tap of the impulse response is judged. If it is greater than or equal to the set threshold, the position of the tap is retained; otherwise, the response of the tap is removed.
  • the user data arrives at the receiver through the spread spectrum scrambling and air channel, and the received signal e can be expressed as:
  • d is the column vector composed of the symbols of all users, the user's respective spread spectrum scrambling code and the post-processed channel impulse response £ generation system transmission matrix A, the structure of the A matrix is as shown in Fig. 1, where Ns is the user symbol The length of the number, K is the number of users using a scrambling code, and Q is the spreading factor, as shown in the following equation -
  • Ka [A kl A kz LA Ka ]', Ka is the number of antennas, Ka ⁇ N (14)
  • a to is a block diagonal array
  • the block ⁇ " can be expressed as
  • the method disclosed in the method of the present invention uses multiple scrambling codes and their corresponding channel estimation and joint detection to increase system capacity in one cell, which greatly improves the capacity of the TD-SCDMA system. , improve the frequency band utilization, or equivalently improve the data throughput rate of a single cell.
  • the present invention is applicable to all applications to all CDMA systems, particularly TDD-CDMA systems and SCDMA systems, and improvements to other systems can also be made with reference to the above-described concepts of the method of the present invention.
  • Any engineer having a background in signal processing, communication, etc. can design corresponding channel estimation and joint detection devices in accordance with the present invention, which are all included in the spirit and scope of the present invention, and thus are protected by the appended claims. range.

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

Abstract

Cette invention concerne un procédé de configuration et de démodulation de codes brouillés multiples dans un système d’accès multiples par répartition de code, qui renforce la capacité du système en configurant des codes brouillés multiples dans des systèmes d’antennes multiples. Le procédé comprent les étapes suivantes : configurer les codes brouillés multiples pour chaque cellule, le procédé de génération et le montant de codes d’étalement pour chaque cellule étant cohérent avec cette configuration de codes brouillés multiples d’une façon conventionnelle ; le procédé de génération d’une séquence de formation des abonnés étant cohérent avec la provision d’un protocole TD actuel, et étant différent uniquement en ce qu’il réduit la taille de la fenêtre de réponse impulsionnelle du canal pour chaque abonné lorsqu’il génère probablement des codes brouillés multiples. Selon cette invention, le procédé tire pleinement avantage de tout système d’antennes multiples, fait usage en particulier d’un caractère d’accès multiple par répartition spatial (AMRS) résultant d’antennes multiples dans un système TD-SCDMA, adopte le procédé particulier de configuration de ressource sans fil et son procédé de démodulation. Le procédé attribue de nouveau la ressource de codes brouillés, utilise des codes brouillés multiples dans chaque cellule, renforçant ainsi considérablement la capacité du système, augmentant la disponibilité de la bande de fréquence et économisant la ressource de fréquence.
PCT/CN2005/000939 2005-06-28 2005-06-28 Procédé de configuration et de démodulation de codes brouillés multiples dans un système cdma WO2007000079A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2005800487562A CN101133581B (zh) 2005-06-28 2005-06-28 一种cdma系统中多扰码配置及其相关的解调方法
PCT/CN2005/000939 WO2007000079A1 (fr) 2005-06-28 2005-06-28 Procédé de configuration et de démodulation de codes brouillés multiples dans un système cdma

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Application Number Priority Date Filing Date Title
PCT/CN2005/000939 WO2007000079A1 (fr) 2005-06-28 2005-06-28 Procédé de configuration et de démodulation de codes brouillés multiples dans un système cdma

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN101483879B (zh) * 2008-01-08 2010-12-01 大唐移动通信设备有限公司 获得码道资源信道质量评估结果的方法、装置及系统
CN101689873B (zh) * 2007-11-23 2013-02-27 中兴通讯股份有限公司 一种td-scdma系统发射分集及接收机处理方法

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CN112291172B (zh) * 2020-12-24 2021-04-09 武汉慧联无限科技有限公司 一种网关及信息解调方法

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CN1738470A (zh) * 2004-08-16 2006-02-22 中兴通讯股份有限公司 一种利用阵列的空分特性提高频带利用率的方法

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FR2833116A1 (fr) * 2001-11-30 2003-06-06 Telediffusion De France Tdf Emetteur-recepteur cdma pour reseau de radiotelephonie
SG107589A1 (en) * 2002-05-03 2004-12-29 Sony Electronics Singapore Pte Receiver method and apparatus for space-time coded cdma signals
CN1627835A (zh) * 2003-12-12 2005-06-15 西门子（中国）有限公司 一种时分同步码分多址接入系统中同步码调制相位簇的检测方法
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101689873B (zh) * 2007-11-23 2013-02-27 中兴通讯股份有限公司 一种td-scdma系统发射分集及接收机处理方法
CN101483879B (zh) * 2008-01-08 2010-12-01 大唐移动通信设备有限公司 获得码道资源信道质量评估结果的方法、装置及系统

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CN101133581A (zh) 2008-02-27
CN101133581B (zh) 2012-01-18

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