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WO2001073993A1 - Dispositif et procede de communication - Google Patents

Dispositif et procede de communication Download PDF

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Publication number
WO2001073993A1
WO2001073993A1 PCT/JP2001/002288 JP0102288W WO0173993A1 WO 2001073993 A1 WO2001073993 A1 WO 2001073993A1 JP 0102288 W JP0102288 W JP 0102288W WO 0173993 A1 WO0173993 A1 WO 0173993A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
mobile station
despreading
station device
communication terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2001/002288
Other languages
English (en)
Japanese (ja)
Inventor
Hiroki Haga
Katsuhiko Hiramatsu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to AU42753/01A priority Critical patent/AU4275301A/en
Publication of WO2001073993A1 publication Critical patent/WO2001073993A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H04B1/7097—Interference-related aspects
    • H04B1/7103—Interference-related aspects the interference being multiple access interference
    • H04B1/7105—Joint detection techniques, e.g. linear detectors

Definitions

  • the present invention relates to a communication device and a communication method used in communication of a code division multiple access (CDMA) system.
  • CDMA code division multiple access
  • a base station device performs wireless communication with a plurality of mobile station devices.
  • the base station device receives a signal in which a signal transmitted by each mobile station device is multiplexed in the same frequency band.
  • the base station apparatus uses a technique called joint detection (Joint Detection; hereinafter referred to as “JD”) from a received signal (received signal) to perform interference due to multipath fading, interference between symbols, and multiple factors.
  • JD Joint detection
  • Various interference such as connection interference is removed, and demodulated data for each mobile station device is extracted.
  • FIG. 1 is a schematic diagram showing an example of a frame format used by a mobile station device in a digital mobile communication system to which JD is applied.
  • the mobile station device converts the information signal spread by the spreading code unique to the mobile station device into the data portion 101 and the data portion 101 in the frame format shown in FIG.
  • the data is transmitted to the base station apparatus using the data section 103.
  • the mobile station device transmits a known signal unique to the mobile station device to the base station device using the midamble section 102 in the frame format.
  • the base station apparatus receives a signal obtained by multiplexing a signal transmitted from each mobile station apparatus in the same frequency band using the frame format shown in FIG.
  • the base station apparatus uses the signal corresponding to the midamble section 102 in the received signal (received signal) and a known signal unique to each mobile station apparatus to obtain a channel for each mobile station apparatus. Get an estimate.
  • the base station apparatus generates a coefficient used for interference removal processing on a received signal using a channel estimation value for each mobile station apparatus and a spreading code unique to each mobile station apparatus.
  • the base station apparatus multiplies the data part 101 and the data part 103 of the received signal by the generated coefficient to generate a demodulated signal that minimizes the interference component. obtain.
  • the base station apparatus can perform a hard decision on the obtained demodulated signal, thereby obtaining demodulation data for each mobile station apparatus.
  • the mobile station apparatus is transmitted by the data section 101 and the data section 103 in the frame format shown in FIG. 1 in order to reduce interference with other mobile station apparatuses. If there is no information signal available, only the midamble 102 in the above frame format is transmitted. That is, when the mobile station device has no information signal to be transmitted, the mobile station device performs communication called DTX that transmits only the midamble portion 102 in the frame format.
  • the conventional digital mobile communication system using JD has the following problems. That is, if a mobile station device that performs DTX (hereinafter referred to as “target mobile station device”) does not transmit any information indicating that DTX is to be performed to the base station device, the base station device performs The station equipment cannot recognize that DTX is being performed. Therefore, the base station apparatus recognizes that the target mobile station apparatus is transmitting the data section 101 and the data section 103, and To generate the coefficients. Therefore, since the generated coefficients include errors, the demodulated signal obtained by multiplying the generated coefficients by the received signal also includes the error power S. As a result, the accuracy of the demodulated data obtained using the demodulated signal deteriorates.
  • the base station apparatus demodulates the information signal about the target mobile station apparatus which is not originally included in the received signal so as to extract the information signal from the received signal.
  • the base station device an abnormal operation of the entire device occurs. Disclosure of the invention
  • An object of the present invention is to provide a communication device (base station device) that maintains good demodulated data quality irrespective of DTX by a transmitting device (mobile station device).
  • the purpose of this is to receive a signal in which signals transmitted by a plurality of transmitting devices are multiplexed in the same frequency band, and to use the spreading code unique to the transmitting device for the received signal (received signal). This is achieved by performing interference cancellation on a received signal by using a despread signal for each of the plurality of transmitting-side devices obtained by performing the spreading process.
  • Fig. 1 is a schematic diagram showing an example of a frame format used by a mobile station device in a digital mobile communication system to which JD is applied;
  • FIG. 2 is a block diagram illustrating a configuration of the communication device according to the embodiment of the present invention.
  • the base station device including the communication device according to the present embodiment performs wireless communication of the CDMA system with a plurality of mobile station devices (transmitting devices).
  • each mobile station device follows the frame format shown in FIG. Then, transmission to the base station apparatus is performed. Specifically, each mobile station device uses the data part 101 and the data part 103 in the frame format shown in FIG. 1 to convert the information signal spread by the spreading code unique to the mobile station device. And transmits it to the base station apparatus. In addition, the mobile station device transmits a known signal unique to the mobile station device to the base station device using the midamble section 102 in the frame format.
  • the base station device receives a signal in which a signal transmitted by each mobile station device is multiplexed in the same frequency band.
  • This base station apparatus removes various interferences from a received signal using joint detection and extracts demodulated data for each mobile station apparatus.
  • FIG. 2 is a block diagram showing a configuration of a base station device provided with a communication device according to an embodiment of the present invention.
  • the number of mobile station devices that perform wireless communication with the base station device is n.
  • a delay unit 201 delays a received signal by a predetermined time and sends it to a multiplication unit described later.
  • the channel estimating units 202-1-2 to 202-n extract the channel estimation values for the mobile station devices l to n by correlating using the received signals, and switch the extracted channel estimation values respectively. 2 0 5 1 Send to 1 2-5—n.
  • the despreading sections 203-1 to 203-n respectively perform despreading processing using the received signals and spreading codes specific to the mobile station apparatuses 1 to n, and are obtained by the despreading processing.
  • the signal is sent to the control unit 204.
  • the control unit 204 uses the signals obtained by the despreading processing in the despreading units 203-l to 203-n to determine whether each of the mobile station devices l to n applies DTX. Determine whether or not.
  • the control section 204 sends a control signal according to the result of the determination to the switches (SW) 205-5-1 to 205-n.
  • Switches 205 to 1 to 205-n respectively calculate the channel estimation values from the channel estimator 202 to 1 to 202 based on the control signal from the controller 204.
  • Reset section 206-1-2 to 06-n or joint detection (hereinafter referred to as “JD”) section 207 Reset section 206-1-2 to 06-n or joint detection (hereinafter referred to as “JD”) section 207.
  • the reset sections 206-1-1 to 206-11 reset the channel estimation values from the switches 205-1-205-n, respectively, and output them to the JD section 207.
  • the JD unit 207 performs a matrix operation using the channel estimation values from the switches 205-1 to 205-n or the reset units 206-:! To 206-n. And outputs the result of the matrix operation to the multiplication unit 208.
  • the multiplication unit 208 multiplies the result of the matrix operation from the JD unit 207 by the received signal from the delay unit 201, and sends the multiplication result to the discriminator 209.
  • the classifier 208 performs hard decision on the result of the multiplication from the multiplication unit 209, and extracts demodulated data.
  • the signals transmitted by each mobile station apparatus according to the above-described frame format are multiplexed on the same frequency band and received by an antenna (not shown).
  • a signal (received signal) received by the antenna is subjected to predetermined reception processing such as frequency conversion by a radio unit (not shown).
  • the received signal subjected to the reception processing is used as a received signal shown in FIG. 2 as a delay unit 201, a channel estimating unit 202——! To 202—n, and a despreading unit 203__1 ⁇ 203-sent to n.
  • the received signal delayed by the predetermined time by the delay unit 201 is sent to the multiplication unit 208.
  • channel estimation sections (202-1 to 202-2-n) obtain channel estimation values (matrices) for mobile station apparatuses l to n, respectively.
  • the channel estimation value is represented by a complex number composed of an I component and a Q component.
  • Channel estimation unit The channel estimation values obtained from 202-1-2 to 205-n are sent to switches 205-1-205-n, respectively.
  • the despreading sections 203-1-2 to 203-n respectively perform despreading processing on signals corresponding to the data portion of the received signal using spreading codes unique to the mobile station apparatuses 1 to n. Done.
  • the spreading codes unique to the mobile station devices l to n correspond to the spreading codes used by the mobile station devices 1 to n when performing the spreading process on the information signal.
  • the mobile station apparatus i When the mobile station apparatus i applies DTX, the mobile station apparatus i transmits the spread-processed information signal to the data portion 1 in the frame format shown in FIG.
  • the despread signal obtained by despreading section 203-i is equivalent to the despread signal obtained when mobile station apparatus i is not present. That is, the level of the despread signal obtained by the despreading unit 203-i becomes very small.
  • the mobile station apparatus i when the mobile station apparatus i does not apply DTX, the mobile station apparatus i transmits the spread information signal to the data section 101 and the data section 1 in the frame format shown in FIG. It is transmitted using 03. Therefore, the level of the despread signal obtained by the despreading section 203-i has a certain level.
  • a signal (level) obtained by despreading a received signal using a spreading code unique to this mobile station device is detected. It can be said that it can be recognized.
  • the control section 204 determines whether or not each of the mobile station apparatuses 1 to n uses DTX using the despread signal from the despreading section 203-to 203-n. That is, based on the despread signals from despreading sections 203_1 to 203-n, it is determined whether or not mobile station apparatuses l to n respectively apply DTX. Specifically, for example, when the level of the despread signal from despreading section 203—i (1 ⁇ i ⁇ n) is equal to or higher than the threshold, mobile station apparatus i does not apply DTX Is determined.
  • the threshold value is determined by, for example, performing a despreading process using a spreading code unique to the predetermined mobile station device on a received signal in which a signal transmitted by the predetermined mobile station device is reliably multiplexed. It can be set using the level of the obtained despread signal.
  • the switch 205— :! Control signals for ⁇ 205-n are generated. Specifically, when it is determined that the mobile station device i (1 ⁇ i ⁇ n) applies DTX, the channel estimation value from the channel estimation unit 202-i is determined for the switch 205-i. A control signal to be sent to the reset unit 206—i is generated. Conversely, if it is determined that the mobile station apparatus i does not apply DTX, a control signal indicating that the channel estimation value from the channel estimation section 202 -i is sent to the JD section 207 for the switch 205 -i Is generated. The control signal generated in this way is a switch 205— :! ⁇ 205— sent to n.
  • the channel estimation value is output based on the control signal from the control unit 204. Specifically, in switch 205-i, which has received a control signal to output the channel estimation value from channel estimation section 202-i to reset section 207, the channel estimation value is output to reset section 206-i. Is done. Conversely, the channel from the channel estimation unit 202—i In the switch 205 i receiving the control signal indicating that the channel estimation value is output to the JD unit 207, the above channel estimation value is output to the JD unit 207 instead of the reset unit 206-i Is done.
  • the reset units 206-1-2 to 206-n reset the channel estimation values from the switches 205-1-205-n, respectively.
  • the reset channel estimation value is sent to JD section 207. Note that the channel estimation value reset by the reset unit 2061-i is equivalent to the channel estimation value for the mobile station device i when the mobile station device i does not exist.
  • the JD unit 207 the channel estimation value from the switch 205-1-2 to 205-n or the channel estimation value from the reset unit 206-1-206-n and each mobile station A matrix operation using a spreading code unique to the device is performed.
  • this matrix operation is performed, a channel estimation value for a mobile station device to which DTX is applied is treated as a channel estimation value for a nonexistent mobile station device. That is, a mobile station device to which DTX is applied is treated as a nonexistent mobile station device.
  • the JD unit 207 performs the following matrix operation. That is, first, the channel estimation value for each mobile station device, the spreading code unique to each mobile station device, and the convolution operation are performed to obtain the convolution operation result (matrix ) Is obtained.
  • system matrix a matrix in which the convolution operation results for each user are regularly arranged.
  • system matrix is expressed as [A].
  • a matrix [B] is obtained by performing a matrix multiplication according to the following equation (1) using the system matrix.
  • [A] H is the conjugate transpose of the system matrix
  • ([ ⁇ ] ⁇ ⁇ [ ⁇ ])- 1 is the inverse matrix of [ ⁇ ] ⁇ ⁇ [ ⁇ ].
  • the matrix [B] obtained by the above matrix operation is sent to the multiplication unit 208.
  • a multiplication process is performed between the signal corresponding to the data part in the received signal transmitted from the delay unit 201 and the matrix transmitted from the JD unit 207, and The data for each mobile station device from which the interference has been removed can be obtained. That is, in the multiplication unit 208, interference is removed from the received signal transmitted from the delay unit 201.
  • the obtained data for each mobile station device is sent to the discriminator 209.
  • demodulated data is obtained by making a hard decision on the data for each mobile station apparatus sent from the multiplication unit 208.
  • a despreading process is performed on a received signal using a spreading code unique to the mobile station device, thereby generating a despread signal for the mobile station device. I do. Further, based on the generated despread signal, the mobile station device detects whether or not DTX is applied. Thereafter, as a channel estimation value for the mobile station apparatus determined to apply DTX, when this mobile station apparatus does not exist instead of the actually generated channel estimation value for the mobile station phase apparatus A matrix operation is performed using the channel estimation for this mobile station device in.
  • the base station apparatus can perform an accurate matrix operation without transmitting information indicating that DTX has been applied to the base station apparatus from the mobile station apparatus to which DTX has been applied. Therefore, the accuracy of the obtained demodulated data can be kept good.
  • the mobile station device can reduce transmission power by applying DTX, interference with other mobile station devices can also be reduced.
  • the base station device is equipped with the communication device according to the present invention in order to disclose the best embodiment. That is, now In the digital mobile communication system to which the CDMA method is applied, in the present embodiment, in consideration of the fact that the base station apparatus receives signals transmitted by a plurality of mobile station apparatuses, the base station apparatus The case where the communication device according to the present invention is mounted has been described.
  • the communication device according to the present invention is used as a mobile station device. It can be mounted.
  • the mobile station device equipped with the communication device according to the present invention can keep good demodulation quality of each base station device (each transmitting device).
  • “mobile station device (communication terminal device)” is replaced with “base station device” and “base station device” is replaced with “mobile station device ( (Communication terminal device) ”can be easily derived by reading it, so detailed description is omitted.
  • a signal in which signals transmitted by a plurality of transmitting apparatuses are multiplexed in the same frequency band is received, and the received signal (received signal) is unique to the transmitting apparatus. Since the interference removal for the received signal is performed by using the despread signal for each of the plurality of transmitting devices obtained by performing the despreading process using the spreading code, the transmitting device (mobile station device) ), It is possible to provide a communication device (base station device) that maintains good demodulated data quality regardless of DTX. As will be apparent to those skilled in the art, the present invention can be implemented using a general-purpose commercially available digital computer and microprocessor programmed according to the techniques described in the above embodiments. Things.
  • a computer program product that is a recording medium containing instructions that can be used to program a computer that implements the present invention is within the scope of the present invention.
  • This recording medium corresponds to a disk such as a floppy disk, an optical disk, a CD-ROM and a magnetic disk, a ROM, a RAM, an EPROM, an EEPROM, a magneto-optical card, a memory card or a DVD, but is not particularly limited thereto. is not.
  • the JD used in the present embodiment includes not only the technology disclosed in “Zero Forcing and Minimum Mean-Square-Error Equalization for Multiuser Detection in Code-Division Multiple-Access Channels” described above, but also this technology. Can be used as appropriate. This description is based on Japanese Patent Application No. 2000-089360 filed on Mar. 28, 2000. This content is included here. Industrial applicability
  • the present invention is suitable for use in the field of communication devices and communication methods used in code division multiple access communication.

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

Abstract

L'invention concerne une unité de désétalement conçue pour désétaler le signal reçu avec un code de désétalement propre à un dispositif de station mobile. Un commutateur juge, sur la base du niveau de corrélation du signal désétalé pour chaque dispositif de station mobile, s'il produit ou non une estimation de canal déterminée pour un dispositif de station mobile par rapport à une unité de réenclenchement ou une unité JD. Cette dernière effectue un calcul de détection commune à l'aide de l'estimation de canal à partir de l'unité de réenclenchement ou de l'estimation de canal à partir du commutateur et produit une matrice servant à éliminer les interférences du signal reçu. Ce dernier, retardé d'une durée prédéterminée, est multiplié par la matrice à partir de l'unité JD, les données, dont on a éliminé les interférences, étant ainsi obtenues pour chaque dispositif de station mobile.
PCT/JP2001/002288 2000-03-28 2001-03-22 Dispositif et procede de communication Ceased WO2001073993A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU42753/01A AU4275301A (en) 2000-03-28 2001-03-22 Communication device and communication method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000-89360 2000-03-28
JP2000089360A JP2001285254A (ja) 2000-03-28 2000-03-28 通信装置及びその方法

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WO (1) WO2001073993A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003083598A1 (fr) * 2002-03-29 2003-10-09 Linkair Communications, Inc. Procede de detection conjointe de porteuse de correlation
WO2004110091A1 (fr) * 2003-06-05 2004-12-16 Keio University Appareil et procede de communication radio et procede et appareil d'attribution de canal de communication
CN100391269C (zh) * 2002-11-29 2008-05-28 重庆重邮信科股份有限公司 移动通信系统中估计移动终端用户数的方法
CN101179832B (zh) * 2006-11-07 2011-08-10 中兴通讯股份有限公司 业务承载信道迁移方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3522678B2 (ja) * 2000-09-27 2004-04-26 松下電器産業株式会社 通信端末装置及び復調方法
AU2001290287A1 (en) 2000-09-29 2002-04-15 Matsushita Electric Industrial Co., Ltd. Demodulator and demodulating method

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WO1996042146A1 (fr) * 1995-06-13 1996-12-27 Ntt Mobile Communications Network Inc. Demodulateur amdc
JPH11168408A (ja) * 1997-12-05 1999-06-22 Fujitsu Ltd 干渉キャンセラ装置
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JPH11251959A (ja) * 1998-03-05 1999-09-17 Fujitsu Ltd 干渉キャンセラ装置及び無線通信装置
JP2000013360A (ja) * 1998-06-25 2000-01-14 Nec Corp Ｄｓ−ｃｄｍａマルチユーザ干渉キャンセラ
JP2000261412A (ja) * 1999-03-06 2000-09-22 Matsushita Electric Ind Co Ltd 干渉信号除去装置
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JPH11510332A (ja) * 1995-08-01 1999-09-07 シーメンス アクチエンゲゼルシヤフト セルラ無線システムにおける同一チャネル干渉の低減方法および低減装置
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JPH11251959A (ja) * 1998-03-05 1999-09-17 Fujitsu Ltd 干渉キャンセラ装置及び無線通信装置
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003083598A1 (fr) * 2002-03-29 2003-10-09 Linkair Communications, Inc. Procede de detection conjointe de porteuse de correlation
CN100391269C (zh) * 2002-11-29 2008-05-28 重庆重邮信科股份有限公司 移动通信系统中估计移动终端用户数的方法
WO2004110091A1 (fr) * 2003-06-05 2004-12-16 Keio University Appareil et procede de communication radio et procede et appareil d'attribution de canal de communication
CN101179832B (zh) * 2006-11-07 2011-08-10 中兴通讯股份有限公司 业务承载信道迁移方法

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AU4275301A (en) 2001-10-08

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