WO2002054628A1 - Repetiteur sans fil large bande utilisant la technique de mise en forme de faisceaux pour service de telecommunication sans fil - Google Patents

Repetiteur sans fil large bande utilisant la technique de mise en forme de faisceaux pour service de telecommunication sans fil Download PDF

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Publication number
WO2002054628A1
WO2002054628A1 PCT/KR2001/002266 KR0102266W WO02054628A1 WO 2002054628 A1 WO2002054628 A1 WO 2002054628A1 KR 0102266 W KR0102266 W KR 0102266W WO 02054628 A1 WO02054628 A1 WO 02054628A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
interference
antenna
formulating
receiving
Prior art date
Application number
PCT/KR2001/002266
Other languages
English (en)
Inventor
Joo-Wan Kim
Chong-Hyun Lee
Original Assignee
Kmtelecomm Inc.
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
Priority claimed from KR1020000085725A external-priority patent/KR20010067033A/ko
Application filed by Kmtelecomm Inc. filed Critical Kmtelecomm Inc.
Publication of WO2002054628A1 publication Critical patent/WO2002054628A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15564—Relay station antennae loop interference reduction
    • H04B7/15571—Relay station antennae loop interference reduction by signal isolation, e.g. isolation by frequency or by antenna pattern, or by polarization
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0848—Joint weighting
    • H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion

Definitions

  • This invention is related to a repeater system repeating a received signal
  • a repeater is used to remove a shadowing region in which
  • the repeater equipment receives weak signal
  • the repeater cannot operate properly if the
  • an existing repeater uses separate
  • a repeater can be designed by placing the receiving and
  • broadband-WLL network (the required bandwidth: more than 1.25MHz), broadband-WLL network (the required bandwidth: more than 1.25MHz), broadband-WLL network (the required bandwidth: more than 1.25MHz), broadband-WLL network (the required bandwidth: more than 1.25MHz), broadband-WLL network (the required bandwidth: more than 1.25MHz), broadband-WLL network (the required bandwidth: more than 1.25MHz), broadband-WLL network (the required bandwidth: more than 1.25MHz), broadband-WLL network (the required bandwidth: more than 1.25MHz), broadband-WLL network (the required bandwidth: more than 1.25MHz), broadband-WLL network (the required bandwidth: more than 1.25MHz), broadband-WLL network (the required bandwidth: more than 1.25MHz), broadband-WLL network (the required bandwidth: more than 1.25MHz), broadband-WLL network (the required bandwidth: more than 1.25MHz), broadband-WLL network (the required bandwidth: more than 1.25MHz), broadband-WLL network (the required bandwidth: more than 1.25MHz), broadband-WLL network (the required bandwidth: more than 1.25
  • I T-2000 network (the required bandwidth: more than 5MHz).
  • the object of this invention is to supply a repeater system for
  • broadband wireless network by developing the broad-band interference
  • the present invention comprises a receiving
  • array antenna a multi-channel receiver, a spatial signal processor, a modulator &
  • the receiving antenna is to receive weak signal from base station and
  • the multi-channel receiver receives signals from the receiving array antenna, converts the frequency of signals into base-band frequency, and then
  • the spatial signal processor converts analog signals to digital signals
  • ADC analog to digital converter
  • DAC digital to analog converter
  • the modulator & amplifier converts the base-band signal to the original
  • RF-signal amplifies the signal, and sends this signal into transmitting antenna.
  • the transmitting antenna transmits the signal to a shadowing region.
  • FIG 1 illustrates an overall setting of the present invention.
  • Figure 2 shows a block diagram of the proposed repeater system
  • Figure 3 shows a block diagram of a proposed algorithm of the present
  • Figure 4 is a block diagram of a hardware structure related to the proposed algorithm.
  • FIG. 5 is a flowchart of the proposed algorithm.
  • Figure 6 shows a waveform of an original received signal.
  • Figure 7 shows a waveform of Interference added signal.
  • Figure 8 shows beam patterns obtained via with and without spatial
  • Figure 9 shows a waveform of a recovered signal.
  • the repeater 107 is placed between base station
  • receiving antenna 101 and transmitting antenna 103 are separated vertically more
  • the number of the feed line of receiving antenna is need only one.
  • the repeater system amplifies the weak signal coming
  • the interference signal becomes stronger as the receiving and the transmitting antennas become closer. Since the distance
  • the receiving array antenna box 101 As shown in figure 1, the receiving array antenna box 101 and
  • transmitting antenna 103 is placed 2 ⁇ 4m apart. As shown in figure 2, the
  • receiving array antenna box for forward link comprises a receiving array antenna
  • 201 indicates a receiving array antenna
  • 202 indicate a multi-channel
  • receive indicates a spatial signal processor
  • 204 indicates a modulator
  • the receiving array antenna 201 and the transmitting antenna 205 are identical to each other.
  • the spatial signal processor 203 is needed.
  • the spatial signal processing technique has the merit of treating wideband signal
  • This invention is focused on the interference cancellation technique
  • antenna 201 antenna elements are aligned vertically and they receive weak
  • antenna 201 faces to the base station, the wanted original signals which is fed into
  • Captured signals are fed into input ports of the multi-channel receiver 202). And then those are fed into the spatial signal processor 203 after being
  • spatial signal processor 203 converts these signals to digital signals with ADC
  • the spatial signal processor which is explained in detail further.
  • GSC generalized side-lobe canceller
  • the GSC based beamforming algorithm is designed to extract
  • interference signal component has the same statistical properties as the original
  • this invention is composed of the following steps:
  • Step 1 Signal Extraction by facing the receiving array antenna to the
  • Step 2 Extraction of the interference and the noise components which
  • Step 3 Original signal extraction which can be obtained by subtracting
  • Wg Linearly constrained vector 301 designed for looking at the direction
  • noise components is orthogonal to Wg.
  • P Projection matrix 303, which is to project the signal passed through
  • Wa Beamforming vector 304, which is obtained by minimizing the error
  • the interference cancellation can occur in the
  • Signal processing part 305 The part, which subtracts the signal passing
  • the RLS is well known for its fast conversion
  • the field programmable gate array (FPGA) 401 is used for the arithmetic logic
  • DSP digital signal processor
  • the algorithm is composed of the linearly constrained vector
  • the algorithm performs the following:
  • the base station by shifting the phase of array.
  • orthogonal matrix which is orthogonal to Wg.
  • the orthogonal matrix can be found
  • the output signal is mainly composed of the original signal.
  • the output signal is mainly composed of the original signal.
  • the output signal is mainly composed of the
  • the forward or backward smoothing is performed to produce
  • the final dot product When using SS, the effective array aperture is reduced but the coherent signals can be detected and processed.
  • noise signal is obtained via multiplying the data with SS in S3 and the matrix Ca
  • S4 is accumulated to form the covariance matrix or the inverse covariance matrix.
  • This matrix is used for processing the RLS algorithm in computing the
  • the EVD method can be used. However, because the computational cost of
  • the covariance matrix itself can be used for formulating the
  • rows of the covariance matrix span the same subspace of the current signal.
  • the resulting signal passing through P is the interference only.
  • the projected vector is obtained by multiplying the vector Wa in S7 with the projection matrix P in
  • the beam pattern of the original signal With the projected beamforming vector, the beam pattern of the original signal.
  • proposed algorithm is capable to cancel the interference by forming deep nulls in
  • this invention is applicable to develop wideband wireless repeater
  • broadband wireless networks e.g., cellular network, PCS network, broadband-

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Radio Relay Systems (AREA)

Abstract

La présente invention concerne un système répétiteur sans fil large bande utilisé pour la communication mobile, comprenant: une antenne réseau de réception servant à recevoir un signal d'origine faible d'une station de base et des signaux d'interférence forts produits par l'antenne d'émission; un récepteur à canaux multiples servant à convertir des signaux à fréquence radio en signaux à fréquence propre, et à amplifier les signaux; un processeur de signal spatial servant à supprimer le signal d'interférence compris dans le signal issu du récepteur à canaux multiples; un modulateur et amplificateur servant à convertir le signal de sortie du processeur de signal spatial en signal à fréquence radio, et à amplifier le signal; une antenne d'émission servant à émettre le signal vers la zone d'ombre. Lorsque l'antenne de réception et l'antenne d'émission sont disposés verticalement, cette invention peut s'appliquer à la mise en place d'un système répétiteur sans fil large bande qui est fiable et résistant à différentes erreurs. Ceci est rendu possible par l'amplification efficace du signal d'origine faible reçu, par suppression de la forte interférence avec la technique de traitement de signal rapide proposée qui résiste également à différentes erreurs des éléments d'antenne.
PCT/KR2001/002266 2000-12-29 2001-12-26 Repetiteur sans fil large bande utilisant la technique de mise en forme de faisceaux pour service de telecommunication sans fil WO2002054628A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1020000085725A KR20010067033A (ko) 2000-12-29 2000-12-29 이동통신용 광대역무선중계장치
KR2000/85725 2000-12-29
KR2001/74281 2001-11-27
KR1020010074281A KR100354173B1 (ko) 2000-12-29 2001-11-27 빔 형성 기술을 이용한 이동통신용 광대역무선중계장치 및 광대역무선중계장치에서의 간섭신호 제거방법

Publications (1)

Publication Number Publication Date
WO2002054628A1 true WO2002054628A1 (fr) 2002-07-11

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PCT/KR2001/002266 WO2002054628A1 (fr) 2000-12-29 2001-12-26 Repetiteur sans fil large bande utilisant la technique de mise en forme de faisceaux pour service de telecommunication sans fil

Country Status (1)

Country Link
WO (1) WO2002054628A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1711928A1 (fr) * 2004-01-12 2006-10-18 Behzad Mohebbi Amplificateur cellulaire a faible portee
WO2008044902A1 (fr) * 2006-10-13 2008-04-17 Electronics And Telecommunications Research Institute Procédé de relais pour stations relais (rs) reposant sur l'utilisation d'une zone de relais direct dans un système de relais multi-saut
US7907513B2 (en) 2007-03-02 2011-03-15 Qualcomm Incorporated Superimposed composite channel filter
WO2012165823A2 (fr) * 2011-05-27 2012-12-06 Hoseo University Academic Cooperation Foundation Répéteur
US8606175B2 (en) 2009-11-30 2013-12-10 Electronics And Telecommunications Research Institute RF relay of full-duplex and method for removing interference of EM level thereof
US9014621B2 (en) 2009-04-10 2015-04-21 Nextivity, Inc. Short-range cellular booster

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5630208A (en) * 1994-07-19 1997-05-13 Trimble Navigation Limited Adaptive multipath equalization

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5630208A (en) * 1994-07-19 1997-05-13 Trimble Navigation Limited Adaptive multipath equalization
US6031882A (en) * 1994-07-19 2000-02-29 Trimble Navigation Limited Adaptive equalization of multipath signals

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1711928A1 (fr) * 2004-01-12 2006-10-18 Behzad Mohebbi Amplificateur cellulaire a faible portee
EP1711928B1 (fr) * 2004-01-12 2015-08-26 Nextivity, Inc. Amplificateur cellulaire a faible portee
WO2008044902A1 (fr) * 2006-10-13 2008-04-17 Electronics And Telecommunications Research Institute Procédé de relais pour stations relais (rs) reposant sur l'utilisation d'une zone de relais direct dans un système de relais multi-saut
US7907513B2 (en) 2007-03-02 2011-03-15 Qualcomm Incorporated Superimposed composite channel filter
US7907891B2 (en) 2007-03-02 2011-03-15 Qualcomm Incorporated Physical layer repeater utilizing real time measurement metrics and adaptive antenna array to promote signal integrity and amplification
US7911985B2 (en) 2007-03-02 2011-03-22 Qualcomm Incorporated Automatic gain control and filtering techniques for use in on-channel repeater
US8116239B2 (en) 2007-03-02 2012-02-14 Qualcomm Incorporated Use of a filterbank in an adaptive on-channel repeater utilizing adaptive antenna arrays
US8121535B2 (en) 2007-03-02 2012-02-21 Qualcomm Incorporated Configuration of a repeater
US9014621B2 (en) 2009-04-10 2015-04-21 Nextivity, Inc. Short-range cellular booster
US8606175B2 (en) 2009-11-30 2013-12-10 Electronics And Telecommunications Research Institute RF relay of full-duplex and method for removing interference of EM level thereof
WO2012165823A2 (fr) * 2011-05-27 2012-12-06 Hoseo University Academic Cooperation Foundation Répéteur
WO2012165823A3 (fr) * 2011-05-27 2013-03-28 Hoseo University Academic Cooperation Foundation Répéteur

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