WO2008133443A1 - Duplexeur pour bande complète et système de communication radio associé - Google Patents

Duplexeur pour bande complète et système de communication radio associé Download PDF

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Publication number
WO2008133443A1
WO2008133443A1 PCT/KR2008/002350 KR2008002350W WO2008133443A1 WO 2008133443 A1 WO2008133443 A1 WO 2008133443A1 KR 2008002350 W KR2008002350 W KR 2008002350W WO 2008133443 A1 WO2008133443 A1 WO 2008133443A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
reception
transmission
full band
converter
Prior art date
Application number
PCT/KR2008/002350
Other languages
English (en)
Inventor
Yong Sik Shin
Se Hyun Oh
Jong Tae Ihm
Jong Guk Ahn
Byung Suk Lee
Kyoung Joon Kim
Seong Hoon Jeon
Hyun Mo Ko
Sung Ho Shin
Jae Woan Byun
Original Assignee
Sk Telecom 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
Priority claimed from KR1020070040363A external-priority patent/KR100813238B1/ko
Priority claimed from KR1020080027021A external-priority patent/KR101431528B1/ko
Application filed by Sk Telecom Co., Ltd. filed Critical Sk Telecom Co., Ltd.
Publication of WO2008133443A1 publication Critical patent/WO2008133443A1/fr

Links

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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/50—Circuits using different frequencies for the two directions of communication
    • H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver

Definitions

  • the present invention relates to a full band duplexer and a radio communication system therefor. More particularly, the present invention relates to a full band duplexer that can output a signal, obtained by removing an interference signal attributable to a transmission signal from a received signal, using a digital filtering technique, thereby being able to utilize a full band without separating transmission and reception bands, and a radio communication system therefor.
  • Background Art
  • FDD Frequency Division Duplexing
  • TDD Time Division Duplexing
  • an object of the present invention is to provide a a full band duplexer that can output a signal, obtained by removing an interference signal, attributable to a transmission signal, from a received signal, using a digital filtering technique, thereby being able to utilize a full band without separating transmission and reception bands.
  • the present invention provides a full band duplexer for transmitting and receiving radio signals, and enabling transmission and reception signals to be stably transmitted and received without experiencing interference
  • the full band duplexer including a directional coupler for coupling a transmission signal; a transmission Analog/Digital (A/D) converter for receiving the coupled signal, and outputting a first signal, which is a digital signal; a reception A/D converter for outputting a second signal, which is a reception signal converted into a digital signal; and a digital processing unit for removing an interference signal from the second signal using correlation between the first signal from the transmission A/D converter and the second signal from the reception A/D converter, and outputting only a target reception signal, from which the interference signal has been removed.
  • A/D Analog/Digital
  • the present invention provides a full band duplexer for transmitting and receiving radio signals, and enabling transmission and reception signals to be stably transmitted and received without experiencing interference
  • the full band duplexer including a directional coupler for coupling a transmission signal; a transmission A/D converter for receiving the coupled signal, and outputting a first signal, which is a digital signal; a reception A/D converter for outputting a second signal, which is a reception signal converted into a digital signal; and a digital processing unit for using the first signal from the transmission A/D converter and the second signal from the reception A/D converter as input signals, correcting the first signal so that a mean square error between the corrected first signal and the second signal is minimized, and outputting a target reception signal through combination of the corrected first signal with the second signal.
  • the present invention provides a full band duplexer, including a directional coupler for coupling a transmission signal; a transmission A/D converter for receiving the coupled signal, and outputting a first signal, which is a digital signal; a reception A/D converter for outputting a second signal, which is a reception signal converted into a digital signal; and a digital processing unit for performing control to predict a channel in connection with a mobile communication terminal communicating with an antenna, to perform pre-distortion on the first signal, to remove an interference signal from the second signal using a correlation with the second signal, and to output only a target reception signal, from which the interference signal has been removed, over the predicted channel.
  • the present invention provides a radio communication system for a full band duplexer, including the full band duplexer for coupling a transmission signal, converting the coupled signal into a first signal, which is a digital signal, converting a reception signal into a second signal, which is a digital signal, and outputting only a target reception signal, from which an interference signal, included in the second signal, has been removed using a correlation between the first signal and the second signal; a radio communication device for performing radio communication using the full band duplexer; and a mobile communication terminal for receiving the reception signal from the radio communication device, and transmitting the reception signal related to the transmission signal over a time band different from a time band over which the transmission signal was received.
  • the present invention provides a full band duplexer, including a directional coupler for coupling a transmission signal; a transmission A/D converter for receiving the coupled signal, and outputting a first signal, which is a digital signal; a reception A/D converter for outputting a second signal, which is a reception signal converted into a digital signal; and a digital processing unit for performing control to predict a channel in connection with a mobile communication terminal communicating with an antenna, to perform pre-distortion on the first signal, to correct the first signal using a factor, which minimizes a square of a difference with the second signal, and to output a target reception signal, in which the corrected first signal and the second signal are combined together, over the predicted channel.
  • the present invention provides a radio communication system for a full band duplexer, including the full band duplexer for coupling a transmission signal, converting the coupled signal into a first signal, which is a digital signal, converting a reception signal into a second signal, which is a digital signal, using the first signal and the second signal as inputs, correcting the first signal using a factor that minimizes a square of a difference between the second signal and the first signal, and outputting a target reception signal through combination of the corrected first signal with the second signal; a radio communication device for performing radio communication using the full band duplexer; and a mobile communication terminal for receiving the reception signal from the radio communication device, and transmitting the reception signal related to the transmission signal over a time band different from a time band over which the transmission signal was received.
  • a transmission signal is coupled and the coupled signal is used to remove noise from a reception signal, and thus it is expected that interference attributable to the transmission signal can be effectively removed and a contribution can be made to the improvement of the efficiency of use of frequencies and the improvement of the quality of service provided by communication service providers.
  • FIG. 1 is a diagram showing an example of the use of frequency bands in a prior art
  • FIG. 2 is a diagram showing an example of the use of frequency bands in a conventional FDD system using a PIM eliminator
  • FIG. 3 is a diagram showing an example of the use of frequency bands according to the present invention.
  • FIG. 4 is a diagram showing the construction of a full band duplexer according to an embodiment of the present invention.
  • FIG. 5 is a diagram showing a first embodiment of a digital processing unit
  • FIG. 6 is a diagram showing a second embodiment of the digital processing unit
  • FIG. 7 is a diagram showing a third embodiment of the digital processing unit.
  • Fig. 8 is a diagram illustrating a method in which the full band duplexer processes signals in conjunction with a mobile communication terminal.
  • reception A/D converter reception A/D converter
  • Fig. 3 is a diagram showing an example of the use of frequency bands according to the present invention.
  • the full band duplexer of the present invention removes a transmission signal and interference attributable to the transmission signal from a received signal, thereby enabling the same frequency band to be used as transmission and reception bands.
  • the full band duplexer of the present invention couples a transmission signal using a directional coupler, removes the transmission signal and noise attributable to the transmission signal, which flow into a reception antenna, using the coupled signal, and utilizes a digital filtering technique in order to remove the noise.
  • FIG. 4 is a diagram showing the construction of a full band duplexer according to an embodiment of the present invention.
  • the full band duplexer 100 of the present invention includes a high-power amplifier 111, a transmission filter 112 and a direction coupler 113 as constructions for processing transmission signals input from the transmitting end of a radio communication device, such as a base station or a repeater, and a reception filter 121, a low-noise amplifier 122, a reception A/D converter 123, a transmission A/D converter 124 and a digital processing unit 125 as constructions for processing wirelessly received signals and inputting the signals to the receiving end.
  • a radio communication device such as a base station or a repeater
  • a reception filter 121, a low-noise amplifier 122, a reception A/D converter 123, a transmission A/D converter 124 and a digital processing unit 125 as constructions for processing wirelessly received signals and inputting the signals to the receiving end.
  • the high-power amplifier 111 amplifies a transmission signal and inputs the signal to the transmission filter 112, and the transmission filter 112 removes frequencies outside of a transmission band from the amplified signal and inputs the signal to the directional coupler 113.
  • the direction coupler 113 couples the signal input through the transmission filter
  • the antenna used for the full band duplexer 100 according to the embodiment of the present invention shown in Fig. 4, is a separate transmission and reception antenna having high transmission and reception isolation.
  • the full band duplexer 100 does not employ a typical analog antenna, but employs a separate transmission and reception antenna having high transmission and reception isolation, thereby being able to maximize the performance of the digital processing unit 125 in removing an interference signal from a second signal.
  • the reception filter 121 removes frequencies outside of a reception band from a signal received through the antenna and outputs a resulting signal, and the low-noise amplifier 122 amplifies an input signal from the reception filter 121 and inputs the signal to the reception A/D converter 123.
  • the transmission A/D converter 124 receives the signal coupled by the directional coupler 113, converts the signal into a digital signal, that is, a first signal, and inputs the first signal to the digital processing unit 125, and the reception A/D converter 123 converts the reception signal, output through the reception filter 121, into a digital signal, that is, a second signal, and inputs the second signal to the digital processing unit 125.
  • the digital processing unit 125 uses the first signal from the transmission A/D converter 124 and the second signal from the reception A/D converter 123 as inputs, and removes the transmission signal (first signal) and interference signals, attributable to the transmission signal, from the reception signal using a digital filtering technique.
  • the digital filtering technique includes a method using the correlation between two signals and a filter method. Descriptions thereof will be given with reference to Figs. 5 to 7 below.
  • the full band duplexer 100 sets a Frequency Reuse Factor (FRF) to a value other than 1.
  • FPF Frequency Reuse Factor
  • the FRF may be set to 1. Since the full band duplexer 100 of the present invention uses a separate transmission and reception antenna having high transmission and reception isolation, different frequencies, other than the same frequency, are used for respective sectors, with the result that the FRF is set to a value other than 1.
  • interference signals may be generated due to the same frequency, with the result that interference signals are prevented from being generated by setting the FRF to a value other than 1, and using a separate transmission and reception antenna having high transmission and reception isolation.
  • the digital processing unit 125 functions to perform control to extract a channel in connection with the mobile communication terminal communicating with the separate transmission and reception antenna and to output a target reception signal over the extracted channel.
  • the extraction of a channel in connection with the mobile communication terminal communicating with the full band duplexer 100 is technology that is used in a Multiple Input Multiple Output (MIMO) system.
  • MIMO Multiple Input Multiple Output
  • the full band duplexer 100 can reduce the number of antennas required for communication in such a way as to communicate with the mobile communication terminal over the extracted channel.
  • Fig. 5 is a diagram showing a first embodiment of a digital processing unit, and relates to a digital filtering technique using the correlation between signals.
  • the digital processing unit 125-1 of Fig. 5 is implemented using an anti-phase coupler.
  • the anti-phase coupler uses a reception signal (a reception signal + noise) and a noise signal (the transmission signal of the present invention), and outputs only a target reception signal, from which the noise has been removed. That is, the anti-phase coupler generates the anti-phase signal of an interference signal (a first signal), included in a second signal, to remove interference using the correlation between the first signal from the transmission A/D converter 124 and the second signal from the reception A/D converter 123, extracts a target reception signal by combining the generated anti-phase signal with the second signal, and provides the target reception signal to the receiving end, thereby suppressing interference attributable to the transmission signal.
  • an interference signal a first signal
  • the full band duplexer 100 functions to perform control to perform pre- distortion on the first signal using the extracted channel, and to output a target reception signal, from which an interference signal included in the second signal has been removed using the correlation of the second signal.
  • pre-distortion is a technique that is used for a Digital Pre-Distortion (DPD) amplifier, and is used to maximize the performance of the digital processing unit 125 in removing an interference signal included in the second signal.
  • DPD Digital Pre-Distortion
  • the full band duplexer 100 functions to perform control to perform previous modulation so that terminal signals, included in the first signal and the second signal, can be orthogonal, and to output a target reception signal, from which an interference signal included in the second signal has been removed using the correlation between the first and second signals.
  • the terminal signals are signals that are transmitted from the mobile communication terminal to the base station.
  • FIG. 6 is a diagram showing a second embodiment of the digital processing unit.
  • Fig. 7 is a diagram showing a third embodiment of the digital processing unit. These drawings show embodiments using a filtering technique.
  • the digital processing unit 125-2 of Fig. 6 is implemented using a Wiener filter.
  • Wiener filter is a filter that converts an input into an output that resembles a desired output as closely as possible.
  • a Wiener filter is also referred to as a least squares filter.
  • a Wiener filter employs an algorithm for minimizing the square of the difference with a noise component when a signal and noise are present together at the input end, and is widely applied to time-invariant systems.
  • the Wiener filter uses the first signal from the transmission A/D converter 124 and the second signal from the reception A/D converter as inputs, corrects the first signal using a factor W, which minimizes the square of the difference between the second signal and the first signal, and filters the first signal (filters out noise), output from the transmission A/D converter 124, using the combination of the corrected first signal and the second signal.
  • the digital processing unit 125-2 of the second embodiment outputs a target signal (target reception signal), from which noise has been removed as much as possible, through the combination of the signal filtered by the Wiener filter, that is, the corrected first signal, with the second signal (target signal + noise) output from the reception A/D converter 123.
  • the digital processing unit may be implemented using an adaptive filter, which is more suitable for time variation than the Wiener filter, which is illustrated in Fig. 7.
  • the digital processing unit 125-3 of the present embodiment is implemented using an adaptive filter.
  • the adaptive filter is the same as the Wiener filter in that the adaptive filter filters the first signal (filters out noise) from the transmission A/D converter 124 using a factor W, which minimizes the mean squares error between the corrected first signal and the second signal from the reception A/D converter 123. Meanwhile, the Wiener filter determines the value of the factor at some time intervals, while the adaptive filter determines the value of the factor for each signal sample, thereby performing filtering adapted to time variation.
  • the digital processing unit 125-3 of the present embodiment provides a target signal (target reception signal), from which noise has been removed as much as possible, to the receiving end through the combination of the signal filtered by the adaptive filter and the second signal (target signal + noise) output from the reception A/D converter 123, as in the embodiment of Fig. 6.
  • Fig. 8 is a diagram illustrating a method in which the full band duplexer processes signals in conjunction with the mobile communication terminal.
  • the radio communication equipment can transmit transmission signals over the entire time band using the full band duplexer 100, as shown in Fig. 8(A).
  • the radio communication equipment previously sets up a scheduler for signals transmitted and received in connection with the mobile communication terminal, and transmits a reception signal related to a transmission signal over a time band, different from the time band over which the transmission signal was received, as shown in Figs. 8(B) to 8(E), thereby preventing the mobile communication terminal from performing an additional process of removing interference.
  • the mobile communication terminal when the mobile communication terminal receives a transmission signal from the radio communication equipment, it transmits a reception signal related to the transmission signal over a time band, different from the time band over which the transmission signal was received, in accordance with the scheduler previously set up in conjunction with the radio communication equipment. Accordingly, a transmission signal and a reception signal occur in the same time band, and thus interference phenomena, occurring in the mobile communication terminal, can be reduced.
  • the present invention can be applied to the field of a full band duplexer that can output a signal, obtained by removing an interference signal attributable to a transmission signal from a received signal, using a digital filtering technique, thereby being able to utilize a full band without separating transmission and reception bands, and thus the present invention is a very useful invention having advantages in that a separate guard band is not required and a complete band is available without requiring frequency division or time division.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)

Abstract

La présente invention concerne un duplexeur pour bande complète et un système de communication radio associé. Le duplexeur à largeur de bande complète comprend un coupleur directif qui couple un signal d'émission; un convertisseur analogique/numérique (A/N) d'émission qui reçoit le signal couplé et produit un premier signal qui est un signal numérique; un convertisseur A/N de réception qui produit un second signal qui est un signal de réception converti en signal numérique; et une unité de traitement numérique qui élimine un signal d'interférence du second signal au moyen d'une corrélation entre le premier signal provenant du convertisseur A/N d'émission et le second signal provenant du convertisseur A/N de réception, et produit un signal de réception cible, duquel a été éliminé le signal d'interférence. Selon la présente invention, une bande de garde séparée n'est pas nécessaire et une bande complète est disponible sans nécessiter de répartition fréquentielle ni de répartition temporelle.
PCT/KR2008/002350 2007-04-25 2008-04-25 Duplexeur pour bande complète et système de communication radio associé WO2008133443A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2007-0040363 2007-04-25
KR1020070040363A KR100813238B1 (ko) 2007-04-25 2007-04-25 전대역 듀플렉서
KR1020080027021A KR101431528B1 (ko) 2008-03-24 2008-03-24 전대역 듀플렉서 및 그를 위한 무선 통신 시스템
KR10-2008-0027021 2008-03-24

Publications (1)

Publication Number Publication Date
WO2008133443A1 true WO2008133443A1 (fr) 2008-11-06

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PCT/KR2008/002350 WO2008133443A1 (fr) 2007-04-25 2008-04-25 Duplexeur pour bande complète et système de communication radio associé

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WO (1) WO2008133443A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2352234A1 (fr) * 2008-11-21 2011-08-03 Huawei Technologies Co., Ltd. Procédé et dispositif de compensation de brouillage de transmission dans un émetteur-récepteur et émetteur-récepteur
US9065519B2 (en) 2010-05-27 2015-06-23 Ubiqam Ltd. Method and system of interference cancelation in collocated transceivers configurations
CN109194361A (zh) * 2018-08-10 2019-01-11 锐捷网络股份有限公司 同频段射频信号干扰抑制方法、处理器及无线接入点
CN114513215A (zh) * 2022-02-18 2022-05-17 维沃移动通信有限公司 电子设备的信号处理方法和电子设备

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060005773A (ko) * 2004-07-14 2006-01-18 에스케이 텔레콤주식회사 동일 채널 주파수를 사용하는 무선중계시스템의 다중경로간섭제거 장치 및 방법
US7076228B1 (en) * 1999-11-10 2006-07-11 Rilling Kenneth F Interference reduction for multiple signals

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7076228B1 (en) * 1999-11-10 2006-07-11 Rilling Kenneth F Interference reduction for multiple signals
KR20060005773A (ko) * 2004-07-14 2006-01-18 에스케이 텔레콤주식회사 동일 채널 주파수를 사용하는 무선중계시스템의 다중경로간섭제거 장치 및 방법

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2352234A1 (fr) * 2008-11-21 2011-08-03 Huawei Technologies Co., Ltd. Procédé et dispositif de compensation de brouillage de transmission dans un émetteur-récepteur et émetteur-récepteur
EP2352234A4 (fr) * 2008-11-21 2012-03-28 Huawei Tech Co Ltd Procédé et dispositif de compensation de brouillage de transmission dans un émetteur-récepteur et émetteur-récepteur
US8331509B2 (en) 2008-11-21 2012-12-11 Huawei Technologies Co., Ltd. Method and device for cancelling transmitter interference in transceiver, and transceiver
US9065519B2 (en) 2010-05-27 2015-06-23 Ubiqam Ltd. Method and system of interference cancelation in collocated transceivers configurations
EP2577875B1 (fr) * 2010-05-27 2016-04-20 Ubiqam Ltd. Procédé et système de suppression d'interférences dans des configurations d'émetteurs-récepteurs contigus
CN109194361A (zh) * 2018-08-10 2019-01-11 锐捷网络股份有限公司 同频段射频信号干扰抑制方法、处理器及无线接入点
CN114513215A (zh) * 2022-02-18 2022-05-17 维沃移动通信有限公司 电子设备的信号处理方法和电子设备
CN114513215B (zh) * 2022-02-18 2023-12-01 维沃移动通信有限公司 电子设备的信号处理方法和电子设备

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