WO2003034616A1 - Station radio fixe pour communications mobiles - Google Patents

Station radio fixe pour communications mobiles Download PDF

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Publication number
WO2003034616A1
WO2003034616A1 PCT/JP2002/010545 JP0210545W WO03034616A1 WO 2003034616 A1 WO2003034616 A1 WO 2003034616A1 JP 0210545 W JP0210545 W JP 0210545W WO 03034616 A1 WO03034616 A1 WO 03034616A1
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WO
WIPO (PCT)
Prior art keywords
base station
mobile terminal
frequency
radio base
mobile communication
Prior art date
Application number
PCT/JP2002/010545
Other languages
English (en)
Japanese (ja)
Inventor
Yoshihiko Saito
Original Assignee
Nec 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 Nec Corporation filed Critical Nec Corporation
Publication of WO2003034616A1 publication Critical patent/WO2003034616A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field

Definitions

  • the present invention relates to a radio base station for mobile communication and a diversity receiving method used therefor, and more particularly to a mobile communication radio base station and a diversity receiving method suitable for a mobile terminal used in a high-speed moving vehicle such as a Shinkansen vehicle.
  • the frequency for land mobile communications is shifting from the 400MHz band to the 800MHz band, and further to the 1.5GHz band. In the next generation of mobile communications, frequencies in the 2 GHz band will be used.
  • Frequency drift means the amount of frequency offset from the center frequency. For example, if the frequency is 800 Hz, the maximum Doppler frequency is about 185 Hz even when the mobile terminal is moving at 250 km / h, so special measures must be taken to maintain good reception. No action is required.
  • Japanese Patent Application Laid-Open No. 2001-194449 discloses the following technology. To avoid the Doppler shift included in the received signal, the signal input to the frequency converter is shifted by the Doppler shift. Hereinafter, this is referred to as a second conventional technology.
  • the sign of Doppler shift when a mobile terminal moving at high speed moves in a direction approaching and away from the radio base station changes. You can't solve it.
  • the second conventional technology when used, it is possible to solve the change of the Doppler shift sign when a mobile terminal moving at high speed moves in the direction of moving away from the base station. It is. However, since each area is covered by one frequency or one antenna, it can have only one Doppler shift code. Thus, if the mobile terminal is set to correct the Doppler shift that occurs when it moves in a certain direction, it cannot be corrected when the mobile terminal moves in the opposite direction.
  • an object of the present invention is to provide a mobile communication radio base station capable of reducing the influence of Doppler shift even when a mobile terminal is traveling not only in one direction but also in the opposite direction without using a plurality of frequencies. Is to provide.
  • Another object of the present invention is to provide a diversity receiving method used for the mobile communication radio base station. Disclosure of the invention
  • a radio base station for mobile communication is a diversity receiver having a plurality of antennas for receiving a radio signal from a mobile terminal and a frequency offset for canceling a Doppler frequency in a reception signal of each of the plurality of antennas.
  • the diversity receiving method according to the present invention cancels a Doppler frequency in a reception signal of each of a plurality of antennas for receiving a radio signal from a mobile terminal with a frequency offset set corresponding to each of the plurality of antennas.
  • the frequency shift between the radio base station and the mobile terminal is caused by the Doppler effect, especially when the mobile terminal is moving at high speed. Therefore, good calls (reception conditions of the mobile communication radio base station) can be performed without adding new functions to the mobile terminal. Therefore, in the diversity receiving method for a mobile communication radio base station according to the present invention, the mobile communication radio base station is provided with a plurality of antennas, and each antenna is provided with a frequency offset for canceling the Doppler frequency. . This makes it possible to reduce the effects of Doppler shift even when the mobile terminal is traveling not only in one direction but also in the opposite direction, without using multiple frequencies. In this case, the frequency offset is set to a different value for each receiver constituting the diversity receiver.
  • FIG. 1 is a block diagram showing a configuration of a mobile communication radio base station according to an embodiment of the present invention.
  • FIG. 2 is a block diagram showing a configuration example of a PLL section used in the local oscillator of FIG. 1,
  • FIG. 3 is a diagram for explaining a diversity receiving method used for a mobile communication radio base station according to one embodiment of the present invention
  • FIG. 4 is a diagram for explaining an example of an operation when the mobile terminal is moving from the left to the right with respect to the mobile communication radio base station according to one embodiment of the present invention.
  • FIG. 3 is a diagram for explaining Doppler frequency generated in mobile communication in which a mobile terminal is moving at high speed,
  • FIG. 6 is a characteristic diagram showing a relationship between Doppler frequency and time generated in mobile communication in which a mobile terminal is moving at high speed.
  • FIG. 1 is a block diagram showing the configuration of a mobile communication radio base station (hereinafter abbreviated as a radio base station) according to a preferred embodiment of the present invention.
  • a radio base station a mobile communication radio base station
  • an RXO antenna 2 and an RX 1 antenna 3 are arranged in a radio base station 1.
  • Frequency converters 11 and 12 are connected to RX 0 antenna 2 and RX 1 antenna 3, respectively.
  • the frequency converters 11 and 12 offset the reception frequency by the local oscillation signals RX0 and RX1 from the local oscillators 13 and 14, and output the RXO reception signal and the RX1 reception signal.
  • the local oscillators 13 and 14 are used to convert the frequency to the RF (Radio Frequency) symbol received by RX 0 antenna 2 and RX "I antenna 3 3 ⁇ 4 IF (Intermediate Frequency) 1 symbol. It is provided independently for RX 0 and for RX 1. Local oscillators 13 and 14 have frequency offsets for canceling the Doppler frequency for each of RX 0 antenna 2 and RX 1 antenna 3, respectively. The frequency offsets of the oscillators 13 and 14 can be independently set at different values, and can be changed arbitrarily.
  • one local oscillator is usually provided for RX0 and RX1.
  • the output of one local oscillator is divided into two and input to two frequency converters.
  • FIG. 2 is a block diagram showing a configuration example of a PLL (Phase Locked Loop) unit incorporated in the local oscillators 13 and 14 of FIG.
  • the PLL section 20 is composed of a VCO (Voltage Controlled Oscillator) 21, an amplifier 22, a PLLIC (Integrated Circuit) 23, and an LPF (Low Pass Filter) 24. And generates a local oscillation signal.
  • VCO Voltage Controlled Oscillator
  • PLLIC Integrated Circuit
  • LPF Low Pass Filter
  • a commercially available PLLIC23 can be used, and frequency designation data for changing the frequency can be input. That is, the frequency offset can be changed by changing the frequency indication data input to the PLLIC 23.
  • Different values are set for the frequency specification data for PL LI C23 for RX0 and RX1. In other words, different values By setting, different offsets are set in the local oscillators 13 and 14, respectively.
  • FIG. 3 is a diagram illustrating a diversity receiving method for a radio base station according to an embodiment of the present invention.
  • FIG. 4 is a diagram illustrating an example of an operation when the mobile terminal moves from the left to the right with respect to the radio base station according to the embodiment of the present invention.
  • FIGS. 5 and 6 are diagrams for explaining that the radio frequency between the mobile terminal moving at high speed and the radio base station has a frequency shift due to the Doppler effect. In Fig. 6, the relationship between Doppler frequency and time is shown with Doppler frequency on the vertical axis and time on the horizontal axis.
  • the diversity receiving method for the radio base station 1 according to the present embodiment is based on the following points.
  • the mobile terminal 6 since the mobile terminal 6 is in a vehicle such as a Shinkansen vehicle and moving at high speed, a frequency shift occurs due to the Doppler effect on the radio frequency between the radio base station 1 and the mobile terminal 6. Used in certain areas.
  • a radio base station capable of compensating for the Doppler effect of the X-ray frequency from the mobile terminal 6 to the radio base station 1 (reception by the radio base station 1) without adding a new function to the mobile terminal 6
  • the diversity reception method of station 1 will be described.
  • the sector ⁇ of the wireless base station 1 covers an area of 180 ° around the wireless base station 1, and the area covers the direction of the line 4 of the Shinkansen.
  • the boundary 5 of the sector or is indicated by a dotted line.
  • the radio base station 1 is provided with two receivers (R X0 antenna 2 and R X1 antenna 3) for receiving a signal from the mobile terminal 6 in the sector ⁇ .
  • Sector ⁇ is composed of di-parity reception.
  • the mobile terminal 6 is moving from left to right in the figure.
  • the mobile terminal 6 is used in a Shinkansen vehicle moving at high speed on the track 4, and passes through the positions A, B, and C as time passes.
  • the shortest distance from the wireless base station 1 to the track 4 is 20 m, and the area of the wireless base station 1 is 3 km in radius.
  • the Doppler frequency f d (H z) when the radio frequency used for communication between the radio base station 1 and the mobile terminal 6 is 200 OM Hz is expressed by the following equation.
  • ⁇ is the wavelength (m) of the radio frequency.
  • V is the moving speed (mZs) of the mobile terminal 6.
  • S is an angle formed by the traveling direction of the mobile terminal 6 and a straight line connecting the mobile terminal 6 and the wireless base station 1.
  • the parameters are determined with the goal of keeping the deviation of the radio frequency received by the mobile terminal 6 from the center frequency within ⁇ 30 OHz.
  • This value of ⁇ 300 Hz is ⁇ 0.15 ppm for the radio frequency of 200 OHz. It can be said that it is appropriate to target this value when designing a normal mobile communication system.
  • the sector or of the radio base station 1 is configured by diversity reception. That is, the radio base station 1 has two receivers for receiving radio signals from the mobile terminals 6 in the sector ⁇ .
  • the receiver connected to RX0 antenna 2 is expressed as RX0
  • the receiver connected to RX1 antenna 3 is expressed as RX1.
  • RX0 antenna 2 when mobile terminal 6 moves from left to right, RX0 antenna 2 is When the mobile terminal 6 is approaching the wireless base station 1, it receives a wireless signal from the mobile terminal 6.
  • the RX 1 antenna 3 receives a radio signal from the mobile terminal 6 when the mobile terminal 6 is moving away from the radio base station 1.
  • the RX 1 antenna 3 receives a radio signal from the mobile terminal 6 when the mobile terminal 6 is approaching the wireless base station 1.
  • the RXO antenna 2 receives a radio signal from the mobile terminal 6 when the mobile terminal 6 is moving away from the radio base station 1.
  • the radio base station 1 receives a signal having the center frequency of 2000.0002 MHz.
  • RXO receives a radio signal from mobile terminal 6.
  • the radio base Chikyoku 1 from mobile terminals 6 in the receiver RX 1 having a center frequency of 1 999. 9998 MH Z Receiving the wireless signal.
  • the receiver RX0 and the receiver RX1 are configured to have different frequency offsets. As a result, mobile terminal 6 is moving at high speed Thereby, even when a Doppler frequency is generated, the radio base station 1 can maintain a good reception state.
  • each parameter uses the value used in the above description.
  • the Doppler frequency at point A of the mobile terminal 6 traveling at 250 kmZh / h on the track 4 from the left direction is +460 Hz when read from FIG.
  • the radio base station 1 receives the radio signal shifted by + 460 H Z radio signal to the frequency 200 OM H Z from the mobile terminal 6 in the point A. However, the radio base station 1 receives the radio signal from the mobile terminal 6 with the receiver RX 0 given the offset of +200 Hz. As a result, the Doppler frequency +460 Hz is reduced by +200 Hz, and the radio base station 1 receives a radio signal having a frequency offset of +260 Hz with respect to the center frequency 200 OMHz.
  • the mobile terminal 6 passes through the boundary between the direction toward the radio base station 1 and the direction away from the radio base station 1.
  • the radio base station 1 receives a radio signal shifted from the mobile terminal 6 by a frequency of 200 Hz with respect to the frequency of 200 MHz. However, the radio base station 1 receives one 2 0 0 H Z only receiver RX 1 given an offset. As a result, the Doppler frequency minus 46 OHz is reduced by 200 Hz, and a radio signal having a frequency offset 260 Hz with respect to the center frequency 200 MHz is received.
  • the radio frequency between the radio base station 1 and the mobile terminal 6 is increased by the Doppler effect. Even if a frequency shift occurs, good communication can be maintained without adding a new function to the mobile terminal 6. That is, it is possible to reduce the influence of Doppler shift even when the mobile terminal 6 is traveling not only in the minus direction but also in the opposite direction without using a plurality of frequencies.
  • the radio base station for mobile communication and the diversity receiving method according to the present invention are particularly suitable for mobile communication using a mobile terminal used in a vehicle moving at high speed.

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

Abstract

L'invention concerne une station radio fixe (1) qui comporte une antenne RX0 (2) et une antenne RX1 (3). Les antennes RX0 et RX1 sont reliées à des convertisseurs de fréquences (11 et 12), respectivement. Ces convertisseurs de fréquence sont reliés à des oscillateurs locaux (13 et 14), respectivement. En fonction des signaux provenant des oscillateurs locaux, ces convertisseurs de fréquence appliquent des décalages différents à la fréquence de réception et émettent un signal de réception RX0 et un signal de réception RX1. Chacun des oscillateurs locaux est monté séparément pour les antennes RX0 et RX1, leurs décalages de fréquences pouvant être modifiés indépendamment l'un de l'autre.
PCT/JP2002/010545 2001-10-10 2002-10-10 Station radio fixe pour communications mobiles WO2003034616A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001312311A JP2003124858A (ja) 2001-10-10 2001-10-10 移動通信用無線基地局及びそれに用いるダイバーシチ受信方法
JP2001/312311 2001-10-10

Publications (1)

Publication Number Publication Date
WO2003034616A1 true WO2003034616A1 (fr) 2003-04-24

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ID=19130992

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2002/010545 WO2003034616A1 (fr) 2001-10-10 2002-10-10 Station radio fixe pour communications mobiles

Country Status (2)

Country Link
JP (1) JP2003124858A (fr)
WO (1) WO2003034616A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03190331A (ja) * 1989-12-19 1991-08-20 Matsushita Electric Ind Co Ltd データ受信装置
JPH09284251A (ja) * 1996-04-10 1997-10-31 Jisedai Digital Television Hoso Syst Kenkyusho:Kk 受信装置
JP2000244454A (ja) * 1999-02-19 2000-09-08 Mitsubishi Electric Corp Ｃｄｍａ受信機

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03190331A (ja) * 1989-12-19 1991-08-20 Matsushita Electric Ind Co Ltd データ受信装置
JPH09284251A (ja) * 1996-04-10 1997-10-31 Jisedai Digital Television Hoso Syst Kenkyusho:Kk 受信装置
JP2000244454A (ja) * 1999-02-19 2000-09-08 Mitsubishi Electric Corp Ｃｄｍａ受信機

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Publication number Publication date
JP2003124858A (ja) 2003-04-25

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