WO2014049907A1 - 無線送信装置、vswr判定装置およびvswr判定方法 - Google Patents
無線送信装置、vswr判定装置およびvswr判定方法 Download PDFInfo
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- WO2014049907A1 WO2014049907A1 PCT/JP2013/002852 JP2013002852W WO2014049907A1 WO 2014049907 A1 WO2014049907 A1 WO 2014049907A1 JP 2013002852 W JP2013002852 W JP 2013002852W WO 2014049907 A1 WO2014049907 A1 WO 2014049907A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
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- the present invention relates to a wireless transmission device, a VSWR determination device, and a VSWR determination method, and more particularly to a VSWR processing technique.
- LTE Long Term Evolution
- W-CDMA Wideband Code Division Multiple Access
- LTE Long Term Evolution
- SC System configuration
- the base station wireless transmitter of the own system and the base station wireless transmitter of another system are combined with an OFDM (Orthogonal Frequency Division Multiplexing) scheme such as LTE using a shared antenna, etc.
- OFDM Orthogonal Frequency Division Multiplexing
- the wireless transmitter of the other system Is input to the wireless transmission device of its own system and becomes an interference wave.
- VSWR Voltage Standing Wave Ratio
- FIG. 2 shows a VSWR measuring apparatus and method according to the first related technology.
- the baseband signal generator 2 receives the data signal generated by the MAC1 and converts it into an I / Q axis signal as a modulated baseband signal.
- the modulator 3 modulates the I / Q axis signal into an RF band modulation downlink signal based on the oscillation signal from the local oscillator 40.
- the high-power amplifier 4 increases the RF band modulation downlink signal to a predetermined transmission power and outputs it to the filter 5.
- the filter 5 reduces transmission spurious of the RF band modulation downlink signal.
- the RF band modulated downlink signal is radiated into space by the antenna 7.
- a VSWR measuring device is installed in the front stage of the antenna 7.
- a directional coupler 6 is inserted in front of the antenna 7 in order to detect a traveling wave and a reflected wave for VSWR measurement.
- the directional coupler 6 outputs a traveling wave to the traveling wave detector 8.
- the directional coupler 6 outputs the reflected wave to the reflected wave detector 9.
- the traveling wave detector 8 detects the detection voltage value of the traveling wave.
- the reflected wave detector 8 detects the detection voltage value of the reflected wave.
- the difference detector 10 detects the difference between the traveling wave detection voltage and the reflected wave detection voltage. Based on this difference detection voltage, the VSWR calculator 11 calculates the VSWR, and the VSWR averager 12 smoothes the VSWR.
- the VSWR smoothed by the VSWR averager 12 is output and displayed as it is as the final report value.
- a large error occurs in the VSWR measurement in the environment described later.
- FIG. 5 shows a case where a base station wireless transmission apparatus of the own system and an OFDM system such as LTE are combined with a base station wireless transmission apparatus of another system using a shared antenna or the like.
- an interference wave from the wireless transmission device of another system is input to the wireless transmission device of the own system.
- FIG. 6 shows a time waveform of the LTE downlink signal.
- E-TM1.1 and E-TM2 signals exist densely on the time axis.
- Reference Signal that becomes a training signal on the terminal side with a shorter duration exists sparsely on the time axis.
- the VSWR measurement value is a bad value. turn into.
- the VSWR is a correct measurement value.
- the VSWR measurement value is considerably degraded.
- the VSWR report when the antenna is expected is misrecognized as a total reflection aspect, so that an erroneous alarm or the like is activated in the monitoring station and the own system stops.
- a directional coupler inserted to detect a traveling wave and a reflected wave for VSWR measurement is provided between a filter (bandpass filter) connected to an antenna and a wireless transmission device.
- a filter bandpass filter
- bandpass filters are also inserted between the traveling wave detector and the reflected wave detector branched from the directional coupler to sufficiently suppress out-of-band interference and interference before detection. It corresponds with.
- FIG. 1 Another configuration example related to the above three cases is shown in FIG.
- down-converters are provided in the traveling wave path and the reflected wave path branched by the directional coupler, and the local oscillator frequency is changed.
- the baseband or IF frequency after the converter is passed through a narrower band filter while changing the target passband, so that the external out-of-band interference wave / jamming wave is attenuated more steeply.
- the error of the VSWR measurement value by these interference waves and interference waves is reduced.
- the configuration shown in the above three prior arts is effective when the frequency band of the external interference wave / jamming wave is far from the desired transmission band.
- the transmission band of the own system and the interference band from another system are close to each other or overlap in the band, there arises a problem that the frequency selectivity by the filter cannot be expected.
- a steep filter characteristic is required, which causes a problem in that the design difficulty is greatly increased, leading to an increase in the shape of the apparatus and the price.
- a configuration in which a fixed-band filter is inserted into the detection system there is a problem that frequency flexibility is lost.
- the baseband signal generator 2 receives the data signal generated by the MAC1 and converts it into an I / Q axis signal as a modulated baseband signal.
- the modulator 3 modulates the I / Q axis signal into an RF band modulation downlink signal based on the oscillation signal from the local oscillator 40.
- the high-power amplifier 4 increases the RF band modulation downlink signal to a predetermined transmission power and outputs it to the filter 5.
- the filter 5 reduces transmission spurious of the RF band modulation downlink signal.
- the RF band modulated downlink signal is radiated into space by the antenna 7.
- a VSWR measuring device is installed in the front stage of the antenna 7.
- a directional coupler 6 is inserted in front of the antenna 7 in order to detect a traveling wave and a reflected wave for VSWR measurement.
- the directional coupler 6 outputs a traveling wave to the traveling wave detector 8.
- the directional coupler 6 outputs the reflected wave to the reflected wave detector 9.
- the traveling wave detector 8 detects the detection voltage value of the traveling wave.
- the reflected wave detector 8 detects the detection voltage value of the reflected wave.
- the difference detector 10 detects the difference between the traveling wave detection voltage and the reflected wave detection voltage. Based on this difference detection voltage, the VSWR calculator 11 calculates the VSWR, and the VSWR averager 12 smoothes the VSWR.
- the baseband signal generated by the baseband signal generator 2 is branched and input to the baseband signal amplitude integrator 14 to determine whether the signal is in a dense state giving VSWR accuracy. Take the cumulative total.
- FIG. 4 shows a procedure for masking a low-level VSWR report value by baseband level threshold determination.
- the VSWR average value by the VSWR averager 12 is updated once per second.
- the baseband signal integrator 14 accumulates the baseband level corresponding to 10 msec ⁇ 100 sample for 1 second. .
- the latest VSWR report value (output of the VSWR averager 12) smoothed at the determination time is sure. Judge that it seems. In that case, SW 13 is switched to the VSWR output display direction, and VSWR is reported to the outside.
- the latest VSWR report value (VSWR averaged) smoothed at the determination time point. It is determined that the output of the device 12 is not accurate. Then, the SW 13 is switched to the VSWR invalid display direction, and the VSWR report to the outside is invalidated.
- Patent Document 8 discloses a method of confirming the VSWR normality of the receiving antenna instead of confirming the VSWR normality of the transmitting antenna.
- a separate and dedicated PN (Pseudorandom Noise) spread signal generator and demodulator are required in combination with the main signal receiving system. is there.
- a PN spread signal different from the operation transmission signal is radiated as unnecessary radiation from the reception antenna at the time of VSWR measurement.
- Patent Document 9 in the antenna (ANT) VSWR measurement, when the electrical length between the antenna (ANT) load and the coupling port (CPL) is different, and the traveling wave component leaks to the reflected wave port due to poor CPL-directivity. Then, an error occurs as a combined vector of reflected waves, and a VSWR error occurs. Then, by inserting a phase shifter between the antenna and the coupling port and changing the electrical length, the traveling wave leakage component is removed from the calculation of the maximum reflected wave vector and the minimum reflected vector, and the VSWR accuracy is improved. Therefore, the example shown in Patent Document 9 provides an improvement in VSWR accuracy in the absence of an external interference wave, and does not show consideration for the sparse density of the traveling wave and the external interference wave.
- Japanese Patent No. 4390334 Japanese Patent Laid-Open No. 03-051772 JP 2004-286632 A Japanese Patent No. 4062023 JP 04-357471 A Japanese Patent No. 3271277 Japanese Patent No.2697342 JP 2011-010185 A JP2005-017138
- each prior art has a problem that the VSWR measurement value deteriorates due to the density of the transmission signal density.
- the present invention has been made to solve such a problem, and an object thereof is to provide a wireless transmission device, a VSWR determination device, and a VSWR determination method capable of reporting a good VSWR measurement value.
- a wireless transmission device includes a VSWR measurement unit that measures VSWR, and a VSWR determination unit that determines reliability of a measurement value of the VSWR measured by the VSWR measurement unit, wherein the VSWR determination unit includes a baseband signal And a baseband signal analyzing means for analyzing the baseband signal by detecting a difference between the delayed signal obtained by delaying the baseband signal, and the baseband signal analyzed by the baseband signal analyzing means, A baseband signal sparseness determining unit that determines the sparseness of the baseband signal based on a difference from the delayed signal, and the baseband signal sparseness determining unit determines that the baseband signal is sparse A VSWR output switching means for restricting the output of the VSWR measuring means.
- a VSWR determination apparatus is a VSWR determination apparatus that determines the reliability of a measured value of VSWR, and detects a difference between a baseband signal and a delayed signal obtained by delaying the baseband signal.
- Baseband signal analysis means for analyzing the baseband signal, and sparse density of the baseband signal based on the difference between the baseband signal analyzed by the baseband signal analysis means and the delayed signal
- a baseband signal sparseness determining unit that, when the baseband signal sparseness determining unit determines that the baseband signal is sparse, includes a VSWR output switching unit that limits the output of the VSWR measuring unit. Is.
- the VSWR determination method includes a step of detecting a difference between a baseband signal and a delayed signal obtained by delaying the baseband signal, and the baseband signal based on the detected difference.
- a wireless transmission device a VSWR determination device, and a VSWR determination method capable of reporting good VSWR measurement values.
- FIG. 1 is a diagram of a wireless transmission device and a VSWR measurement device according to a first exemplary embodiment; It is a figure of the wireless transmitter by the conventional method, and a VSWR measuring apparatus. It is a figure of the wireless transmitter by the conventional method, and a VSWR measuring apparatus. It is a figure of the VSWR report value mask at the time of the low level by baseband level threshold value determination. It is a figure in case the base station type
- Embodiment 1 Embodiments of the present invention will be described below with reference to the drawings with regard to the wireless transmission device and the VSWR measurement device of the present application.
- FIG. 1 shows the configuration of the wireless transmission apparatus according to the first embodiment.
- the wireless transmission device 100 includes a VSWR measurement unit 101 and a VSWR determination unit 102.
- the MAC 1 generates a data signal and outputs it to the baseband signal generator 2.
- the baseband signal generator 2 converts the data signal as a modulated baseband signal into an I / Q axis signal and outputs it to the modulator 3.
- the modulator 3 Based on the oscillation signal from the local oscillator 40, the modulator 3 modulates the I / Q axis signal into an RF band modulation downlink signal.
- the high-power amplifier 4 increases the RF band modulation downlink signal to a predetermined transmission power and outputs it to the filter 5.
- the filter 5 performs transmission spurious reduction on the RF band modulated downlink signal. Thereafter, the RF band modulated downlink signal is radiated from the antenna 7 into space as it passes through the filter 5.
- a directional coupler 6 is inserted in front of the antenna 7. A traveling wave and a reflected wave are detected through the directional coupler 6 for VSWR measurement.
- the VSWR measurement unit 101 measures the VSWR when the antenna 7 is expected, and confirms that spatial radiation from the antenna is performed without any problem.
- the traveling wave detector 8 detects the detection voltage of the traveling wave input via the directional coupler 6.
- the reflected wave detector 9 detects the detection voltage of the reflected wave input via the directional coupler 6.
- the difference detector 10 detects the difference between the detected traveling wave detection voltage and the detected wave detection voltage.
- the VSWR calculator 11 calculates VSWR based on the difference detection voltage detected by the difference detector 10.
- the VSWR output from the VSWR calculator 11 is input to the VSWR averager 12.
- the VSWR averager 12 performs a smoothing process on the VSWR.
- the baseband signal analysis unit 90 is provided to determine whether or not the reported value of the VSWR averager is likely.
- the baseband signal analysis unit 90 includes a delay device 17 and a difference detector 18.
- the baseband signal generated by the baseband signal generator 2 is branched, one is directly input to the difference detector 18, and the other is delayed by the delay unit 17 and then input to the difference detector 18.
- the difference detector 18 outputs a difference between the directly input baseband signal and the delayed input baseband signal to the difference determiner 19.
- the difference determiner 19 determines the sparseness of the baseband signal based on the difference output result from the difference detector 18. Specifically, when the difference is less than a preset determination threshold, it is determined that the baseband signal is dense. When the difference is equal to or greater than a preset determination threshold, it is determined that the baseband signal is sparse.
- the difference determiner 19 can estimate that a dense baseband signal is output when the difference is less than the determination threshold.
- VSWR measured in the output state of a dense baseband signal it can be determined that the measurement accuracy is relatively high. Therefore, it is determined that the latest VSWR report value (output of the VSWR averager 12) smoothed at the time of determination is likely. Then, the switch (SW) 13 is switched in the direction of the VSWR output display, and the VSWR is reported to the outside.
- the difference determiner 19 can estimate that a sparse baseband signal is output.
- the wireless transmission device even if there is an interference wave from a base station wireless transmitter of another system coupled by a shared antenna, it is accurate. It is possible to automatically and immediately detect the time zone in which the VSWR expecting the outside of the antenna can be reported, and to report the acquired VSWR value to the outside. Since VSWR reporting is performed only in dense signal states where sufficient VSWR measurement accuracy can be obtained, VSWR alarms etc. due to malfunctions do not occur, and alarms are triggered only when the antenna itself or a connection problem actually occurs and the VSWR deteriorates Can be done.
- LTE has been described.
- the present invention may be applied to a communication system related to a fourth generation or higher communication standard (for example, LTE-Advanced, IMT-Advanced, WiMAX2).
- a fourth generation or higher communication standard for example, LTE-Advanced, IMT-Advanced, WiMAX2.
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Abstract
Description
・VSWR検出回路及びVSWR検出方法(特許文献1、図1)
・VSWR測定回路(特許文献2、図1)
・VSWRモニタ回路(特許文献3、図1)
・アンテナポート監視システムとその方法(特許文献4、図1)
・アンテナ監視装置(特許文献5、図1、図2)
・定在波比測定装置(特許文献6)
・電圧定在波比測定装置(特許文献7)
本発明は、このような問題を解決するためになされたものであり、良好なVSWR測定値が報告可能な無線送信装置、VSWR判定装置およびVSWR判定方法を提供することを目的とする。
以下、図面を参照して本願の無線送信装置およびVSWR測定装置について本発明の実施の形態について説明する。
MAC1は、データ信号を生成し、ベースバンド信号発生器2に出力する。ベースバンド信号発生器2は、データ信号を変調ベースバンド信号としてI/Q軸信号に変換して変調器3に出力する。変調器3は、局部発振器40からの発振信号に基づいて、I/Q軸信号をRF帯変調ダウンリンク信号に変調する。更に高出力増幅器4は、RF帯変調ダウンリンク信号を所定の送信電力まで高めて、フィルタ5に出力する。フィルタ5は、RF帯変調ダウンリンク信号に対して送信スプリアスの低減を実行する。その後、フィルタ5を通過した通り、RF帯変調ダウンリンク信号は、アンテナ7から空間に放射される。アンテナ7前段には方向性結合器6が挿入されている。方向性結合器6を通じて、VSWR測定のために、進行波と反射波が検出される。VSWR測定部101は、アンテナ7を見込んだ場合のVSWRを測定し、アンテナからの空間放射が問題なく行なわれていることを確認する。
差分検出器18は、直接入力されたベースバンド信号と、遅延後入力されたベースバンド信号との差分を差分判定器19に対して出力する。
差分判定器19は、差分検出器18からの差分出力結果に基づいて、ベースバンド信号の疎密度を判定する。具体的には、差分が予め設定された判定閾値未満の場合には、ベースバンド信号が密であると判定する。また、差分が予め設定された判定閾値以上の場合には、ベースバンド信号が疎であると判定する。
一方、差分判定器19にて、差分が判定閾値以上の場合は、疎なベースバンド信号が出力されていると推定できる。疎なベースバンド信号の出力状態において測定したVSWRについては、測定精度が相対的に低いものと判定できる。従って、その判定時点で平滑化されている最新のVSWR報告値(VSWR平均化器12の出力)は確からしくないものと判定し、スイッチ(SW)をVSWR無効表示の方向へ切り替え、外部へのVSWR報告を無効化する。
また、ベースバンド信号が疎であると判定された場合には、VSWRの出力表示を完全に停止するのではなく、出力表示を継続しつつも、測定精度が劣化状態にある旨を表示する等、様々な手段により、VSWRの出力を制限するものであればよい。
2 ベースバンド発生器
3 変調器
4 高出力増幅器
5 フィルタ
6 方向性結合器
7 アンテナ
8 進行波検出器
9 反射波検出器
10 差分検出器
11 VSWR計算器
12 VSWR平均化器
13 スイッチ
14 ベースバンド信号振幅積分器
15 振幅積分値判定器
17 遅延器
18 差分検出器
19 差分判定器
40 局部発振器
90 ベースバンド信号解析部
100 無線送信装置
101 VSWR測定部
102 VSWR判定部
Claims (10)
- VSWRを測定するVSWR測定手段と、
前記VSWR測定手段で測定したVSWRの測定値の信頼性を判定するVSWR判定手段を備え、
前記VSWR判定手段は、
ベースバンド信号と、当該ベースバンド信号を遅延させた遅延信号との間の差分を検出することによりベースバンド信号を解析するベースバンド信号解析手段と、
前記ベースバンド信号解析手段によって解析された前記ベースバンド信号と遅延信号との間の差分に基づいて当該ベースバンド信号の疎密度を判定するベースバンド信号疎密度判定手段と、
前記ベースバンド信号疎密度判定手段により当該ベースバンド信号が疎であると判定された場合には、前記VSWR測定手段の出力を制限するVSWR出力切り替え手段と、
を備える無線送信装置。 - 前記ベースバンド信号疎密度判定手段は、前記ベースバンド信号と遅延信号との間の差分と判定閾値とを比較してベースバンド信号の疎密度を判定する請求項1に記載の無線送信装置。
- 前記VSWR出力切り替え手段は、
前記VSWR測定手段で測定したVSWR値を、前記ベースバンド信号の差分が密と判定された場合に出力する請求項1または2に記載の無線送信装置。 - 前記無線送信装置は、異なるシステムの基地局系無線送信装置とアンテナを共用している請求項1~3いずれか1項に記載の無線送信装置。
- 前記無線送信装置はLTEのOFDM方式の基地局系無線送信装置と他の基地局系無線送信装置が結合してアンテナを共用していることを特徴とする、請求項1~4いずれか1項に記載の無線送信装置。
- VSWRの測定値の信頼性を判定するVSWR判定装置であって、
ベースバンド信号と、当該ベースバンド信号を遅延させた遅延信号との間の差分を検出することによりベースバンド信号を解析するベースバンド信号解析手段と、
前記ベースバンド信号解析手段によって解析された前記ベースバンド信号と遅延信号との間の差分に基づいて当該ベースバンド信号の疎密度を判定するベースバンド信号疎密度判定手段と、
前記ベースバンド信号疎密度判定手段により当該ベースバンド信号が疎であると判定された場合には、前記VSWR測定手段の出力を制限するVSWR出力切り替え手段と、
を備えるVSWR判定装置。 - 前記ベースバンド信号疎密度判定手段は、前記ベースバンド信号と遅延信号との間の差分と判定閾値とを比較してベースバンド信号の疎密度を判定する請求項6に記載のVSWR判定装置。
- 前記VSWR出力切り替え手段は、
前記VSWR測定手段で測定したVSWR値を、前記ベースバンド信号の差分が密と判定された場合に出力する請求項6または7に記載のVSWR判定装置。 - ベースバンド信号と、当該ベースバンド信号を遅延させた遅延信号との間の差分を検出するステップと、
検出された前記差分に基づいて当該ベースバンド信号の疎密度を判定するステップと、
前記ベースバンド信号が疎であると判定された場合には、VSWR測定結果の出力を制限するステップとを備えるVSWR判定方法。 - 前記ベースバンド信号の差分が密と判定された場合には、VSWR測定結果を出力する請求項9に記載のVSWR判定方法。
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JP2697342B2 (ja) | 1991-04-10 | 1998-01-14 | 株式会社村田製作所 | 電圧定在波比測定装置 |
DE479168T1 (de) | 1990-10-01 | 1992-11-26 | Murata Mfg. Co., Ltd., Nagaokakyo, Kyoto, Jp | Antennenueberwachungsapparat mit welligkeitsfaktor-mess-einheit. |
JP3271277B2 (ja) | 1991-12-05 | 2002-04-02 | 株式会社村田製作所 | 定在波比測定装置 |
JP4062023B2 (ja) | 2002-09-04 | 2008-03-19 | 日本電気株式会社 | アンテナポート監視システムとその方法 |
JP2004286632A (ja) | 2003-03-24 | 2004-10-14 | Mitsubishi Electric Corp | Vswrモニタ回路 |
JP2005017138A (ja) | 2003-06-26 | 2005-01-20 | Nec Corp | Vswrモニタ回路及びvswrモニタ方法 |
JP4379034B2 (ja) | 2003-07-29 | 2009-12-09 | 日本電気株式会社 | Vswr検出回路及びvswr検出方法 |
JP5097175B2 (ja) | 2009-06-29 | 2012-12-12 | 株式会社日立製作所 | 無線受信装置及びその試験方法 |
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- 2013-04-26 JP JP2014538088A patent/JP5831644B2/ja active Active
- 2013-04-26 WO PCT/JP2013/002852 patent/WO2014049907A1/ja active Application Filing
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JPH0486567A (ja) * | 1990-07-30 | 1992-03-19 | Murata Mfg Co Ltd | 高周波測定装置 |
JPH04357471A (ja) * | 1990-10-01 | 1992-12-10 | Murata Mfg Co Ltd | アンテナ監視装置 |
JP2002228692A (ja) * | 2000-11-21 | 2002-08-14 | Telefon Ab L M Ericsson | データ依存性を補償する電力測定方法及び装置 |
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CN106877886A (zh) * | 2017-01-19 | 2017-06-20 | 深圳国人通信股份有限公司 | 多系统接入平台电压驻波比检测方法和装置 |
CN106877886B (zh) * | 2017-01-19 | 2019-03-15 | 深圳国人通信股份有限公司 | 多系统接入平台电压驻波比检测方法和装置 |
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JP5831644B2 (ja) | 2015-12-09 |
US9560541B2 (en) | 2017-01-31 |
US20150230116A1 (en) | 2015-08-13 |
JPWO2014049907A1 (ja) | 2016-08-22 |
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