WO2001099308A1 - Repeteur - Google Patents
Repeteur Download PDFInfo
- Publication number
- WO2001099308A1 WO2001099308A1 PCT/JP2000/004018 JP0004018W WO0199308A1 WO 2001099308 A1 WO2001099308 A1 WO 2001099308A1 JP 0004018 W JP0004018 W JP 0004018W WO 0199308 A1 WO0199308 A1 WO 0199308A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wave
- relay device
- station
- phase shifter
- phase
- Prior art date
Links
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
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/15535—Control of relay amplifier gain
Definitions
- the present invention relates to a relay device used for terrestrial broadcasting or the like, using the same reception frequency and transmission frequency.
- relay devices are installed at relay stations in order to transmit broadcast waves to areas where radio waves are difficult to reach, such as mountainous areas.
- This repeater receives, amplifies, and retransmits the broadcast wave from the master station.
- OFDM OrthogonalFrequenchnCyDivsiolonMltip1e
- S F N Single eFrequencyNetwork: single frequency network
- a condition of D> U is required between the received power D of the master station wave and the received power U of the transmitted wave (wraparound wave) of the own station.
- D> U is required between the received power D of the master station wave and the received power U of the transmitted wave (wraparound wave) of the own station.
- FIG. 1 is a block diagram showing a configuration of a conventional relay device disclosed in Japanese Patent Application Laid-Open No. 11-92484.
- 1 is the main receiving antenna that receives the master station wave (1 in frequency) and the wraparound wave from the local station
- 2 is the auxiliary receiving antenna that receives the wraparound wave from the local station
- 3 is the auxiliary receiving antenna 2.
- 4 is a phase shifter that changes the phase of the signal output from the variable attenuator 3 by a predetermined amount of phase
- 5 is a main phase shifter.
- a combiner that combines the master station signal and the wraparound wave signal received by the receiving antenna 1 with the signal from the phase shifter 4
- 6 is an amplifier that amplifies the signal from the combiner 5
- 7 is an amplifier. It is a transmitting antenna that transmits its own transmission wave (frequency 1) by the signal from 6.
- the main receiving antenna 1 has directivity in the direction of the master station, and mainly receives the master station wave, but also includes a sneak wave from the transmitting antenna 7 of the own station.
- the received signal in which the master station wave and the loop wave are mixed is input to the combiner 5.
- the auxiliary receiving antenna 2 is directed toward the transmitting antenna 7 and receives a wraparound wave from the transmitting antenna 7 of the own station.
- the variable attenuator 3 changes the amplitude of the received signal at a predetermined attenuation rate, and the phase shifter 4 changes the phase of the received signal by a predetermined amount of phase and outputs it to the combiner 5.
- the combiner 5 mixes the master station wave and the loop-back wave received by the main receiving antenna 1.
- the multiplexed signal and the wraparound signal received by the auxiliary receiving antenna 2 and adjusted in amplitude and phase are combined.
- the attenuation factor of the variable attenuator 3 is set so that the wraparound wave signal received by the main reception antenna 1 and the wraparound wave signal received by the auxiliary reception antenna 2 are combined with the same amplitude and opposite phases. If the phase amount of the phase shifter 4 is set, the signal of the wraparound wave is canceled, and the output of the combiner 5 becomes only the signal of the master station wave component.
- the conventional repeater Since the conventional repeater is configured as described above, if the characteristic change of the main receiving antenna 1, the auxiliary receiving antenna 2, and the transmitting antenna 7 changes due to environmental changes due to wind and snow, it is input to the combiner 5. There is a problem that the condition that the two wraparound waves have the same amplitude and opposite phases is broken, and the wraparound waves cannot be completely removed.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a relay device capable of canceling a sneaking wave following an environmental change due to wind or snow without superimposing a self-identification signal. With the goal. Disclosure of the invention
- a relay device is a relay device for receiving and amplifying a master station wave and transmitting a transmission wave having the same frequency as the master station wave, wherein a main reception for receiving the master station wave and a loop-back wave from the own station is provided.
- An antenna, an auxiliary receiving antenna for receiving the wraparound wave from the own station, a variable attenuator for changing the amplitude of the wraparound signal received by the auxiliary reception antenna, and changing a phase of the wraparound wave signal A phase shifter and a master station wave received by the main receiving antenna.
- a synthesizer for synthesizing the signal and the sneak wave signal from the own station, a signal whose amplitude is changed by the variable attenuator and whose phase is changed by the phase shifter, and a signal output from the synthesizer.
- a directional coupler for extracting a combined voltage
- a power detector for obtaining a combined power from the combined voltage extracted by the directional coupler, and an average value of the combined power determined by the power detector.
- a microcomputer for controlling a change in amplitude by the variable attenuator and a change in phase by the phase shifter.
- the relay device includes an output controller that controls the output of the transmission wave from the own station when the power is turned on based on an instruction from the microcomputer. There is an effect that oscillation of the device can be suppressed.
- the microcomputer automatically detects the initial operating points of the variable attenuator and the phase shifter by obtaining the minimum value of the combined power obtained by the power detector.
- the output control for controlling the output of the transmission wave from the own station based on the instruction from the microcomputer. It is equipped with a vessel.
- FIG. 1 is a block diagram showing the configuration of a conventional relay device.
- FIG. 2 is a block diagram showing a configuration of the relay device according to Embodiment 1 of the present invention.
- FIG. 3 is a diagram showing a change characteristic of the average value of the combined power when the attenuation rate of the variable attenuator according to the second embodiment of the present invention is changed.
- FIG. 4 is a diagram showing a change characteristic of an average value of a combined power when the phase shifter according to the second embodiment of the present invention changes the amount of phase shifted.
- FIG. 5 is a block diagram showing a configuration of a relay device according to Embodiment 3 of the present invention.
- FIG. 2 is a block diagram showing a configuration of the relay device according to Embodiment 1 of the present invention.
- reference numeral 8 denotes a directional coupler that extracts a combined voltage output from the combiner 5
- 9 denotes a power detector that obtains combined power from the combined voltage extracted by the directional coupler 8
- 10 denotes a power detector 9.
- This is a microcomputer that controls the attenuation rate of the variable attenuator 3 and the amount of phase shifted by the phase shifter 4 so that the average value of the combined power obtained by the above becomes minimum.
- the rest is the same as the conventional configuration shown in FIG.
- the directional coupler 8 extracts the combined voltage output from the combiner 5, the power detector 9 calculates the combined power from the combined voltage extracted by the directional coupler 8, and sends the calculated combined power to the microcomputer 10. input.
- the master station voltage V M1 input to the main receiving antenna 1 is
- V M2 ui e J - ei f (t _ ⁇ t) becomes (2).
- V d is the average voltage of the master station wave
- V is the average voltage of the loop wave input to main receiving antenna 1
- ⁇ 1 is the phase of the loop wave input to main receiving antenna 1
- At is This is the time required from the reception of the master station wave to the transmission from the transmitting antenna 7 through this relay device to the input to the main receiving antenna 1 or the auxiliary receiving antenna 2, and in the case of a TV relay device, Usually it is 1 ns or more.
- V S2 V provoke 2 e J - e2 f (t- ⁇ t) (3)
- V n2 the auxiliary reception
- ⁇ 2 the phase of the loop wave input to auxiliary receiving antenna 2.
- the voltage V S2 of the loop wave input to the auxiliary receiving antenna 2 is subjected to a change of amplitude Q: times (attenuation rate is high) by the variable attenuator 3 and a phase change of 0 by the phase shifter 4 (shifting phase). If the quantity is, the synthesized voltage V output from the synthesizer 5 is
- V 0 V d f (t) + (V n e j01 + a V felicit 2 e j (02 + 9i) ) f (t- ⁇ t)
- V 0 2 V d 2 f 2 (t) + (V ni ea V iz e j (02+ (i)) 2 f 2 (t - ⁇ t) + 2 V d (V n ea V B2 e j ( e2 + 0) ) f (t) f (t - ⁇ t)
- IaI shows the average value of a.
- the average value of the combined power may be determined by the power detector 9 and output to the microcomputer 10 or the microcomputer 10 may determine the average value.
- the setting of the attenuation factor ⁇ of the variable attenuator 3 is as follows.
- the environment changes due to the snow and the like. If so, the average value of the combined power IV. Controlling the attenuation rate of the variable attenuator 3 and the amount of phase shifted by the phase shifter 4 using the microcomputer 10 so that 2 I is minimized, canceling the looping waves following environmental changes The effect that can be obtained is obtained. According to this algorithm, it is not necessary to superimpose the own-station identification signal for identifying the wraparound wave.
- the initial operating points of the variable attenuator 3 and the phase shifter 4 are set at the time of installation of the relay device, and that the variable attenuator 3 and the phase shifter 4 can follow even when the environment changes. However, it is also possible to automatically obtain the initial operating point.
- FIG. 3 is a graph showing a change characteristic of the average value IV Q 2 I of the combined power when the attenuation factor of the variable attenuator 3 is changed.
- the average value IV of the combined power. 2 I became attenuation factor Hino quadratic curve of the variable attenuator 3, the operating point of canceling around Write-waves, in Figure 3, is where the average value IV 0 2 I of synthesized power is minimized. Therefore, when the power is turned on, the minimum point may be found by gradually changing the attenuation factor ⁇ by the microcomputer 10.
- Fig. 4 shows the average value IV of the combined power when the phase amount ⁇ shifted by the phase shifter 4 is changed.
- FIG. 3 is a diagram showing a change characteristic of 2 I.
- the average value of the synthesized power IV. 2 I is the cosine curve of the shifting phase amount ⁇ , and the operating point for canceling the loop interference is the average value IV of the combined power in Fig. 4.
- 2 I is at a minimum.
- the minimum point may be found by gradually changing the phase amount ⁇ to be shifted by the microcomputer 10.
- the microcomputer 10 calculates the average value IV of the synthesized power. 2 Automatically find the initial operating point where I is minimum Therefore, it is not necessary to measure the amplitude and phase of the loop interference wave and determine the operating points of the variable attenuator 3 and the phase shifter 4 when installing the repeater.
- Embodiment 3
- the initial operating points of the variable attenuator 3 and the phase shifter 4 are obtained and set by measurement at the time of installation of the repeater.
- the loop interference can be sufficiently canceled, and the repeater may oscillate.
- the initial operating points of the variable attenuator 3 and the phase shifter 4 are automatically detected by the microcomputer 10.However, during the detection, the sneak wave can be sufficiently canceled. Similarly, determine whether the repeater may oscillate.
- FIG. 5 is a block diagram showing a configuration of a relay apparatus according to Embodiment 3 of the present invention.
- reference numeral 11 denotes an output from an amplifier 6 controlled by a microcomputer 10 and output to a transmission antenna 7. Output controller.
- the output of the output controller 11 is set to zero by the microcomputer 10 so that the transmission wave is not output from the repeater, and the output value of the power detector 9 at that time is controlled by the microcomputer 10 Keep it. This value indicates the reception level of the master station wave since there is no sneak wave. After that, the output controller 11 is controlled by the microcomputer 10 and the output level of the relay device is gradually increased to a specified output level, whereby oscillation of the relay device can be avoided.
- the power detected by the power detector 9 is set to a preset threshold value (the threshold value is maintained by the microcomputer 10) with respect to the value previously held by the microcomputer 10. If the value is more than 1.0 to 2.0 times the value held, the settings of the variable attenuator 3 and the phase shifter 4 are incorrect, and the wraparound wave is canceled. It is not shown.
- the output controller 11 fixes the output of the repeater at that point, and in the same way as in the case of an environmental change, the microcomputer 10 searches for the optimum operating point and then adjusts the output of the repeater. I just want to raise it.
- the output level of the output controller 11 is set to the specified output level based on the instruction from the microcomputer 10. On the other hand, if it is fixed to an appropriate level of 0.5 times or less, oscillation can be avoided because the oscillation condition of the repeater is not satisfied.
- the output level of the relay device is controlled by the output controller 11 based on the control of the microcomputer 10, so that when the power of the relay device is The effect of being able to suppress oscillation of the repeater when the initial operating point is automatically detected by 0 is obtained.
- the relay apparatus transmits a transmission wave having the same frequency as the received master station wave, and cancels the wraparound wave following an environmental change such as wind and snow. Are suitable.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Relay Systems (AREA)
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002504046A JP3989831B2 (ja) | 2000-06-20 | 2000-06-20 | 中継装置 |
DE60033666T DE60033666D1 (de) | 2000-06-20 | 2000-06-20 | Verstärker |
US10/049,906 US6888881B1 (en) | 2000-06-20 | 2000-06-20 | Repeater |
PCT/JP2000/004018 WO2001099308A1 (fr) | 2000-06-20 | 2000-06-20 | Repeteur |
EP00937322A EP1204223B1 (en) | 2000-06-20 | 2000-06-20 | Repeater |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2000/004018 WO2001099308A1 (fr) | 2000-06-20 | 2000-06-20 | Repeteur |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001099308A1 true WO2001099308A1 (fr) | 2001-12-27 |
Family
ID=11736164
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2000/004018 WO2001099308A1 (fr) | 2000-06-20 | 2000-06-20 | Repeteur |
Country Status (5)
Country | Link |
---|---|
US (1) | US6888881B1 (ja) |
EP (1) | EP1204223B1 (ja) |
JP (1) | JP3989831B2 (ja) |
DE (1) | DE60033666D1 (ja) |
WO (1) | WO2001099308A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006033446A (ja) * | 2004-07-16 | 2006-02-02 | Hitachi Kokusai Electric Inc | 無線中継装置 |
JP2010503272A (ja) * | 2006-09-01 | 2010-01-28 | クゥアルコム・インコーポレイテッド | アイソレーション向上のための適応が行われたデュアル受信機アンテナ構成またはデュアル送信機アンテナ構成を有するリピータ |
US8885688B2 (en) | 2002-10-01 | 2014-11-11 | Qualcomm Incorporated | Control message management in physical layer repeater |
JP2022051333A (ja) * | 2020-09-18 | 2022-03-31 | 日本通信機株式会社 | Fm中継装置 |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BR0311966A (pt) * | 2002-06-21 | 2005-04-26 | Widefi Inc | Aparelho para facilitar a comunicação sem fios em uma rede entre um primeiro dispositivo de comunicação e um segundo dispositivo de comunicação, rede de área local sem fios, repetidor para uma rede incluindo pelo menos primeira e segunda frequências de comunicação bidirecionais, rede operando em pelo menos primeira e segunda frequências de comunicação bidirecionais, dispositivo de extensão de cobertura sem fios, e, métodos para retransmitir um sinal detectado com amplificação e/ou conversão de frequência em um dispositivo de comunicação sem fios |
GB2409616B (en) * | 2002-10-11 | 2006-02-01 | Widefi Inc | Reducing loop effects in a wireless local area network repeater |
BR0315372A (pt) * | 2002-10-15 | 2005-08-23 | Widefi Inc | Repetidor de translação de frequência, e, método para translação de frequência |
US8078100B2 (en) * | 2002-10-15 | 2011-12-13 | Qualcomm Incorporated | Physical layer repeater with discrete time filter for all-digital detection and delay generation |
US7230935B2 (en) * | 2002-10-24 | 2007-06-12 | Widefi, Inc. | Physical layer repeater with selective use of higher layer functions based on network operating conditions |
MXPA05005247A (es) * | 2002-11-15 | 2005-07-25 | Widefi Inc | Repetidor con deteccion para red de area local inalambrica. |
US8027642B2 (en) * | 2004-04-06 | 2011-09-27 | Qualcomm Incorporated | Transmission canceller for wireless local area network |
WO2005115022A2 (en) | 2004-05-13 | 2005-12-01 | Widefi, Inc. | Non-frequency translating repeater with detection and media access control |
KR20070026558A (ko) | 2004-06-03 | 2007-03-08 | 위데피, 인코포레이티드 | 저가의 고성능 국부 발진기 구조를 갖는 주파수 변환반복기 |
WO2006081405A2 (en) | 2005-01-28 | 2006-08-03 | Widefi, Inc. | Physical layer repeater configuration for increasing mino performance |
EP2002565A4 (en) * | 2006-03-31 | 2012-07-04 | Qualcomm Inc | IMPROVED PHYSICAL LAYER REPEATER FOR OPERATION IN WIMAX SYSTEMS |
CN101595657B (zh) | 2006-09-21 | 2014-07-09 | 高通股份有限公司 | 用于缓解中继器之间的振荡的方法和装置 |
CA2667470A1 (en) * | 2006-10-26 | 2008-05-15 | Qualcomm Incorporated | Repeater techniques for multiple input multiple output utilizing beam formers |
JP2010226655A (ja) * | 2009-03-25 | 2010-10-07 | Fujitsu Ltd | 中継方法及び中継装置 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11298421A (ja) * | 1998-04-13 | 1999-10-29 | Nippon Hoso Kyokai <Nhk> | 同期中継装置 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1235751A (en) * | 1985-01-09 | 1988-04-26 | Junji Namiki | One frequency repeater for a digital microwave radio system with cancellation of transmitter-to-receiver interference |
CA2208842C (en) | 1995-10-26 | 2001-01-16 | Ntt Mobile Communications Network Inc. | Booster system |
-
2000
- 2000-06-20 DE DE60033666T patent/DE60033666D1/de not_active Expired - Lifetime
- 2000-06-20 WO PCT/JP2000/004018 patent/WO2001099308A1/ja active IP Right Grant
- 2000-06-20 JP JP2002504046A patent/JP3989831B2/ja not_active Expired - Fee Related
- 2000-06-20 US US10/049,906 patent/US6888881B1/en not_active Expired - Fee Related
- 2000-06-20 EP EP00937322A patent/EP1204223B1/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11298421A (ja) * | 1998-04-13 | 1999-10-29 | Nippon Hoso Kyokai <Nhk> | 同期中継装置 |
Non-Patent Citations (2)
Title |
---|
KOUJI KAWASHIMA ET AL.: "Chijo-ha digital TV housou no SFN chuukei ni okeru mawarikomi-ha canceller", DENSHI JOHO TSUUSHIN GAKKAI GIHOU IT 98-11, May 1998 (1998-05-01), XP002907793 * |
See also references of EP1204223A4 * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8885688B2 (en) | 2002-10-01 | 2014-11-11 | Qualcomm Incorporated | Control message management in physical layer repeater |
JP2006033446A (ja) * | 2004-07-16 | 2006-02-02 | Hitachi Kokusai Electric Inc | 無線中継装置 |
JP4524148B2 (ja) * | 2004-07-16 | 2010-08-11 | 株式会社日立国際電気 | 無線中継装置 |
JP2010503272A (ja) * | 2006-09-01 | 2010-01-28 | クゥアルコム・インコーポレイテッド | アイソレーション向上のための適応が行われたデュアル受信機アンテナ構成またはデュアル送信機アンテナ構成を有するリピータ |
JP4843088B2 (ja) * | 2006-09-01 | 2011-12-21 | クゥアルコム・インコーポレイテッド | アイソレーション向上のための適応が行われたデュアル受信機アンテナ構成またはデュアル送信機アンテナ構成を有するリピータ |
JP2022051333A (ja) * | 2020-09-18 | 2022-03-31 | 日本通信機株式会社 | Fm中継装置 |
JP7113438B2 (ja) | 2020-09-18 | 2022-08-05 | 日本通信機株式会社 | Fm中継装置 |
Also Published As
Publication number | Publication date |
---|---|
EP1204223A1 (en) | 2002-05-08 |
EP1204223B1 (en) | 2007-02-28 |
EP1204223A4 (en) | 2003-02-19 |
DE60033666D1 (de) | 2007-04-12 |
JP3989831B2 (ja) | 2007-10-10 |
US6888881B1 (en) | 2005-05-03 |
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