WO2008117992A1 - Répéteur de ligne de type asymétrique utilisant des doubles bandes - Google Patents

Répéteur de ligne de type asymétrique utilisant des doubles bandes Download PDF

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Publication number
WO2008117992A1
WO2008117992A1 PCT/KR2008/001714 KR2008001714W WO2008117992A1 WO 2008117992 A1 WO2008117992 A1 WO 2008117992A1 KR 2008001714 W KR2008001714 W KR 2008001714W WO 2008117992 A1 WO2008117992 A1 WO 2008117992A1
Authority
WO
WIPO (PCT)
Prior art keywords
frequency band
high frequency
signal
low
amplifier
Prior art date
Application number
PCT/KR2008/001714
Other languages
English (en)
Inventor
Seung Ha Yoo
Beom Yong Lee
Original Assignee
A & P Technology Co.
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 A & P Technology Co. filed Critical A & P Technology Co.
Publication of WO2008117992A1 publication Critical patent/WO2008117992A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/297—Bidirectional amplification
    • H04B10/2972—Each direction being amplified separately
    • 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
    • H04B1/59—Responders; Transponders
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/20—Repeater circuits; Relay circuits

Definitions

  • the present invention relates to a cellular communication system and, in particular, to a dual-band asymmetric line repeater for a cellular communication system that is capable of improving communication service quality in a service shadow area such as in-building environment by using a band-selective signal amplification mechanism while maintaining a cost- effective compact design.
  • a repeater is a device that receives a signal from a base station and retransmits the signal at an appropriately amplified level through a terminal service antenna for extending service coverage of a cellular communication system.
  • the repeater is installed a service shadow area such as subway station, basement parking lot and shopping mall, and inside of a building for guaranteeing quality of service.
  • CDMA Code Division Multiple Access
  • CDMA2000- Ix EV-DO CDMA 2000-lx Evolution-Data Optimized
  • CDMA2000-lx Evolution-Data Voice over IP
  • CDMA2000-lx EV-DV wideband CDMA (WCDMA), Satellite
  • S-DMB Digital Multimedia Broadcasting
  • WiBro wireless broadband
  • (3G) CDMA system operates at over 2GHz.
  • different types of repeaters for supporting the respective 2G and 3G CDMA systems should be deployed.
  • FIG. 1 is a schematic diagram illustrating a configuration of a conventional repeater system.
  • the repeater system is composed of an 8-way divider 7 and a 4-way divider 9 for relaying the signals, in an 8- story building, received through different frequency bands .
  • the repeater system includes a low frequency band repeater 1 for amplifying a low frequency band signal, a high frequency band repeater 3 for amplifying a relatively high frequency band signal, a diplexer 5 for multiplexing the low and high frequency band signals and outputting the multiplexed signals through a signal line, a 8-way divider 7 for dividing the signal received through the signal line and outputting the divided signal through respective output lines, 4-way divider 9 for receiving the signal through a corresponding output line of the 8-way divider 7 and outputting the signal through its four output lines, and an antenna 11 for transmitting the signal in a shadow area.
  • a low frequency band repeater 1 for amplifying a low frequency band signal
  • a high frequency band repeater 3 for amplifying a relatively high frequency band signal
  • a diplexer 5 for multiplexing the low and high frequency band signals and outputting the multiplexed signals through a signal line
  • a 8-way divider 7 for dividing the signal received through the signal line and outputting the divided
  • the low frequency band repeater 1 receives a CDMA or a Personal Communications Service (PCS) signal transmitted by a base station on a relatively low frequency band and retransmits the signal at an appropriately amplified level.
  • the high frequency band repeater 3 receives a WCDMA or DMB signal transmitted by a base station on a relatively high frequency band and retransmits the signal at an appropriately amplified level.
  • PCS Personal Communications Service
  • the diplexer 5 multiplexes the low and high frequency band signals output by the low and high frequency band repeaters 1 and 3 and outputs the multiplexed signal through the signal line.
  • the 8-way divider 7 is arranged on the signal line such that the multiplexed signal is distributed to 8 floors of the building through the respective 8 output signal lines.
  • the 4-way divider 9 is installed at each floor and retransmits the multiplexed signal through 4 antennas .
  • the low and high frequency band signals received by the respective low and high frequency band repeaters 1 and 3 propagate on the same signal line so as to be retransmitted through each antenna.
  • the signals are attenuated as they propagate through the signal line and the attenuation rate increases in proportion of frequency, the signal loss is greater in the high frequency band than in the low frequency band. Accordingly, in a case that more than two different frequency band signals are relayed through the same signal line, the high frequency band signal is significantly weaken, resulting in low throughput of the antenna.
  • the transmission power amplification method is limited to preventing the signal loss since the signal throughput decreases as the length of the signal line increases.
  • Another approach to solve this problem is to use an additional signal line having a relatively large diameter.
  • this method has a shortcoming to increase the implementation cost.
  • the present invention has been made in an effort to solve the above problems, and it is an object of the present invention to provide a dual-band asymmetric line repeater that is capable of improving communication service quality in a service shadow area such as in- building environment with low additional cost while maintaining its compact design.
  • a dual-band asymmetric line repeater includes a signal splitter for splitting multiple signals of distinctive frequency bands multiplexed in a received signal; a bypass unit for bypassing at least one of multiple signals split by the signal splitter; an amplifier for amplifying at least one of multiple signals split by the signal splitter; and a multiplexer for multiplexing the signals output by the bypass unit and the amplifier into a multiplexed signal and retransmitting the multiplexed signal.
  • the signal splitter includes a first low frequency band pass filter for filtering a low frequency band signal from the received signal and a first high frequency band pass filter for filtering a high frequency band signal form the received signal, wherein the bypass unit bypasses the low frequency band signal output by the first low frequency band pass filter to the multiplexer, and the amplifier amplifies the high frequency band signal output by the first high frequency band pass filter.
  • the amplifier includes a drive amplifier for amplifying the high frequency band signal output by the high frequency band pass filter at a predetermined amplification rate.
  • the amplifier includes a low-noise amplifier for low-noise amplifying the high frequency band signal; a band pass filter for filtering the high frequency band signal output by the low-noise amplifier; and a damper for adjusting an output level of the high frequency band signal output by the band pass filter, wherein the drive amplifier amplifies the high frequency band signal output by the damper at a predetermined amplification rate.
  • the multiplexer includes a second low frequency band pass filter for filtering the low frequency band signal output by the bypass unit and a second high frequency band pass filter for filtering the high frequency band signal output by the amplifier, wherein the multiplexer multiplexes the low frequency band signal output by the second low frequency band pass filter and the high frequency band signal output by the second uplink high frequency band pass filter and retransmits the low and high frequency band signals in the form of a multiplexed signal.
  • a dual-band asymmetric line repeater includes a first triplexer for splitting relatively low frequency band uplink and relatively high frequency band downlink signals from an input signal in which multiple cellular communication signals having different characteristics are multiplexed; a bypass unit for bypassing the uplink low frequency band signal; an amplifier for amplifying the uplink high frequency band signal; and a second triplexer for multiplexing the low frequency band signal output by the bypass unit and the high frequency band signal output by the amplifier; wherein, in a case that relatively low frequency band downlink and relatively high frequency band downlink signals, having different characteristics, multiplexed in a transmission signal are received, the second triplexer demultiplexes the downlink low and high frequency band signals, the bypass unit bypasses the downlink low frequency band signal output by the second triplexer, the amplifier amplifies the downlink high frequency band signal output by the second triplexer, the first triplexer multiplexes the downlink low frequency band signal output by the bypass unit and the downlink high frequency band signal
  • the dual-band asymmetric line repeater of the present invention is configured to amplify the signal received through only the high frequency band of two frequency bands, thereby improving the communication service quality in a service shadow area such as in- building environment with low additional cost while maintaining its compact design.
  • FIG. 1 is a schematic diagram illustrating a configuration of a conventional repeater system
  • FIG. 2 is a schematic diagram illustrating a configuration of a repeater system according to an exemplary embodiment of the present invention.
  • FIG. 3 is a circuit diagram illustrating a configuration of a dual-band asymmetric line repeater of FIG. 2.
  • FIG. 2 is a schematic diagram illustrating a configuration of a repeater system according to an exemplary embodiment of the present invention.
  • a divider 27 is used to distribute the cellular communication signals to multiple sectors inside a building.
  • the repeater system includes a low frequency band repeater 21 for amplifying and relaying a low frequency band signal, a high frequency band repeater 23 for amplifying and relaying a high frequency band signal, a diplexer 25 for multiplexing the low and high frequency signals output from the low and high frequency band repeaters 21 and 23 and outputting the multiplexed signal through the signal line, a divider 27 for distributing the multiplexed signal input through the signal line, terminal antennas connected to ends of respective signal lines 31 extended from the divider 27, and a dual-band asymmetric line repeater 100 interposed between the divider 27 and each terminal antenna on each signal line 31.
  • the dual-band asymmetric line repeater 100 amplifies the high frequency band signal multiplexed in the signal output from the diplexer 25 and then retransmits the multiplexed signal through the antennas.
  • the low frequency band repeater 21 receives a signal transmitted by a base station of a 2G cellular communication system operating at a relatively low frequency band, such as CDMA and PCS, and amplifies to output the low frequency band signal to the diplexer 25.
  • a relatively low frequency band such as CDMA and PCS
  • the low frequency band repeater 21 is configured to process the signal received through the frequency band of 800MHz - 900MHz.
  • the high frequency band repeater 23 receives a signal transmitted by a base station of a 3G cellular communication system operating at a relatively high frequency band, such as WCDMA and CDMA2000, and amplifier to output the high frequency band signal to the diplexer 25.
  • the high frequency band repeater 23 is configured to process the signal received through the frequency band of 1,900MHz ⁇ 2,200MHz.
  • the diplexer 25 multiplexes the low and high frequency band signals and outputs the multiplexed signal 5 divider 27.
  • the divider 27 receives multiplexed signal output from the diplexer 25 and distributes the multiplexed signal through signal lines 31.
  • the dual-band asymmetric line repeater 100 detects the high frequency band signal from the multiplexed signal carrying the high and low frequency band signals and amplifies only the high frequency band signal such that the low frequency band signal and the amplified high frequency band signal are transmitted through the terminal antenna in the form of a multiplexed, simultaneously.
  • the dual-band asymmetric line repeater 100 is arranged on the signal line 31 between the divider 27 and each terminal antenna, the present invention is not limited thereto.
  • the dual- band asymmetric line repeater 100 can be arranged on the signal line between the diplexer 25 and the divider 27 or on the signal line between dividers. That is, the dual- band asymmetric line repeater 100 can be installed on any of signal line through which the multiplexed signal is transferred.
  • FIG. 3 is a circuit diagram illustrating a configuration of a dual-band asymmetric line repeater 100 of FIG. 2.
  • the dual-band asymmetric line repeater 100 includes first and second triplexers 110 and 120 for multiplexing the low frequency band signal and uplink and downlink high frequency band signals into a multiplexed signal or demultiplexing the multiplexed signal into the low frequency band signal and uplink and downlink high frequency band signals, an uplink amplifier 140 for amplifying the uplink high frequency band signal separated by the first triplexer 110, and a downlink amplifier 150 for amplifying the downlink high frequency band signal separated by the second triplexer 120.
  • the first triplexer 110 is composed of a first low frequency Band Pass Filter (BPF) 112 for filtering the low frequency band signal, a first uplink high frequency BPF 114 for filtering the uplink high frequency band signal, and a first downlink high frequency BPF 116 for filtering the downlink high frequency band signal.
  • the second triplexer 120 is composed of a second low frequency BPF 122, a second uplink high frequency BPF 124, and a second downlink high frequency BPF 126 that are operating in identical with those of the first triplexer 110.
  • the uplink low frequency band signal output from the first low frequency BPF 112 of the first triplexer 110 is input to the second low frequency BPF 122 of the second triplexer 120 through a bypass line 130 so as to be multiplexed with the high frequency band signals.
  • the downlink low frequency band signal output from the second low frequency BPF 122 of the second triplexer 120 is input to the first low frequency BPF 112 of the first triplexer 110 through the bypass line 130 so as to be multiplexed with the amplified high frequency band signals.
  • the uplink high frequency band signal is separated from the other signals by the first uplink high BPF 114 of the first triplexer 110.
  • the uplink amplifier 140 arranged on the output line of the first uplink high frequency BPF 114 is composed of a Low Noise Amplifier (LNA) 142, an uplink BPF 144, an uplink damper 146, and an uplink drive amplifier 148.
  • LNA Low Noise Amplifier
  • the uplink high frequency band signal is low-noise amplified by the LNA 142, and filtered by the uplink BPF 144 so as to be output as a target frequency band signal, adjusted in pulse by the uplink damper 146, and then input to the uplink drive amplifier 148.
  • the uplink drive amplifier 148 amplifies the uplink high frequency band signal in stepwise manner according to a preset gain and output the amplified high frequency band signal to the second uplink high frequency BPF 124 of the second triplexer 120.
  • the amplified uplink high frequency band signal is multiplexed with other signals by the second triplexer 120 and then output through a terminal antenna or another signal line.
  • the downlink high frequency band signal is separated from other signal by the second high frequency BPF 126 of the second triplexer 120.
  • the downlink amplifier 150 arranged on the output line of the second downlink high frequency BPF 126 is composed of a downlink drive amplifier 158 for amplifying the downlink high frequency band signal, a downlink damper 156, a downlink BPF 154, and an amplifier 152.
  • the downlink high frequency band signal is amplified in stepwise manner by the downlink drive amplifier 158, adjusted in output by the downlink damper 156, filtered by the downlink BPF 154, and then amplified again by the amplifier 152.
  • the amplified downlink high frequency band signal is input to the first downlink high frequency BPF 116 of the first triplexer 100 so as to be multiplexed with other signal and then output through another signal line.
  • the uplink and downlink dampers 146 and 156 are arranged to adjust the signal level of the high frequency band signals for preventing the repeater from malfunctioning by excessive output level of the high frequency band signals.
  • the uplink and downlink dampers 146 and 156 are implemented with a gain adjuster 160 installed outside of the repeater such that the damping rate is adjusted by a user.
  • the gain adjuster 160 is provided with predetermined number of buttons such that the user can increase or decrease the gain by predetermined level, e.g. IdB.
  • the transmission and reception cellular signals are separated into low frequency band signal and uplink/downlink high frequency band signals by the triplexers 110 and 112 arranged at its both ends, and the separated uplink/downlink high frequency band signals are amplified for compensating signal loss to occur on the relay signal line.
  • the first triplexer acts as a splitter for separating the uplink signals from the input signals
  • the second triplexer acts as a multiplexer for multiplexing the amplified uplink signals with other transmission signals.
  • the second triplexer acts as a splitter for separating the downlink signals from the received signals
  • the first triplexer acts as a multiplexer for multiplexing the amplified downlink signals with other received signals.
  • Performance simulations have been conducted on the repeater system with and without the dual-band asymmetric line repeater in view of received signal strength level. The simulation conditions and results are shown in the following table.
  • the simulation has been conducted on a repeater system equipped with an 8-way divider and 4-way divider (see FIG. 1) and using a 1/2" signal line of 200m long.
  • the outputs of both the low and high frequency band repeaters are set to 0.5W[27dB], a number of frequency assignment (FA) in the low frequency band is set to 10, and a number of FA in the high frequency band is set to 4.
  • the received signal strength indicators (RSSIs) measured at the low and high frequency bands were -8IdBm and -10OdBm, respectively, and this shows that the RSSI at the high frequency band decreases to 1/8 of that at the low frequency band.
  • the signal strength measured at the input terminal of the dual-band asymmetric line repeater was -10 ⁇ -15dB.
  • the received signal strength (RSSI) measured at a mobile terminal distanced as much as 30m from the antenna of the repeater system was -75dBm.
  • the simulation result shows that the RSSI of - 10OdBm measured at the remote mobile terminal, when the dual-band asymmetric line repeater 100 was not applied to the repeater system, has been improved to -75dBm by using the dual-band asymmetric line repeater.
  • the dual-band asymmetric line repeater 100 requires a relatively low maximum output level of 0.05W [17dBm] and gain about 4OdB, it can be implemented with simple structure in a compact design.

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

Abstract

L'invention concerne un répéteur de ligne asymétrique à double bande destiné à un système de communication cellulaire et comprenant un diviseur de signaux permettant de diviser plusieurs signaux multiplexés en un signal reçu; une unité de dérivation destinée à dériver au moins un des multiples signaux divisés par le diviseur; un amplificateur destiné à amplifier au moins l'un des multiples signaux divisés par le diviseur et un multiplexeur destiné à multiplexer les signaux émis par l'unité de dérivation et l'amplificateur en un signal multiplexé et à retransmettre le signal multiplexé. Le répéteur de ligne asymétrique à double bande de l'invention améliore la qualité de service de communication dans une zone d'ombre, telle qu'un environnement de bâtiments, tout en conservant un agencement compact et économique.
PCT/KR2008/001714 2007-03-27 2008-03-27 Répéteur de ligne de type asymétrique utilisant des doubles bandes WO2008117992A1 (fr)

Applications Claiming Priority (2)

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KR20070030027 2007-03-27
KR10-2007-0030027 2007-03-27

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WO2008117992A1 true WO2008117992A1 (fr) 2008-10-02

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PCT/KR2008/001714 WO2008117992A1 (fr) 2007-03-27 2008-03-27 Répéteur de ligne de type asymétrique utilisant des doubles bandes

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KR (1) KR100862370B1 (fr)
WO (1) WO2008117992A1 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
GB2514134A (en) * 2013-05-14 2014-11-19 Toshiba Res Europ Ltd A signal manipulator for a quantum communication system

Families Citing this family (3)

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KR101023071B1 (ko) 2008-09-05 2011-03-24 주식회사 동부하이텍 이미지 센서 및 그 제조 방법
KR101298129B1 (ko) * 2011-09-15 2013-08-20 금오공과대학교 산학협력단 트리플렉서를 이용한 삼중 대역 증폭기
CN114541187B (zh) * 2022-04-14 2022-09-20 中国科学院地理科学与资源研究所 一种兼顾地铁车站减震隔振连续屏障及其施工方法

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JP2004215191A (ja) * 2003-01-08 2004-07-29 Shimada Phys & Chem Ind Co Ltd 移動体通信の中継装置
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KR100643590B1 (ko) * 2005-08-29 2006-11-10 에스케이 텔레콤주식회사 듀얼밴드 중계기의 비대칭 감쇄장치

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Publication number Priority date Publication date Assignee Title
KR20030082012A (ko) * 2002-04-15 2003-10-22 주식회사 해피컴 이동통신 시스템의 무선중계장치 및 방법
JP2004215191A (ja) * 2003-01-08 2004-07-29 Shimada Phys & Chem Ind Co Ltd 移動体通信の中継装置
KR20050119224A (ko) * 2004-06-16 2005-12-21 유비코스 주식회사 통합형 무선중계기 및 그를 이용한 신호 중계 방법
KR100643590B1 (ko) * 2005-08-29 2006-11-10 에스케이 텔레콤주식회사 듀얼밴드 중계기의 비대칭 감쇄장치

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2514134A (en) * 2013-05-14 2014-11-19 Toshiba Res Europ Ltd A signal manipulator for a quantum communication system
GB2514134B (en) * 2013-05-14 2016-05-25 Toshiba Res Europe Ltd A signal manipulator for a quantum communication system

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KR20080087610A (ko) 2008-10-01
KR100862370B1 (ko) 2008-10-13

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