CN101034943A - WCDMA optical fiber direct amplifying station - Google Patents
WCDMA optical fiber direct amplifying station Download PDFInfo
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- CN101034943A CN101034943A CNA2006100245396A CN200610024539A CN101034943A CN 101034943 A CN101034943 A CN 101034943A CN A2006100245396 A CNA2006100245396 A CN A2006100245396A CN 200610024539 A CN200610024539 A CN 200610024539A CN 101034943 A CN101034943 A CN 101034943A
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Abstract
A fiber WCDMA Repeater comprises the proximal and distal machine connected by the fiber. The proximal and distal machine has a module for other switching power supply to provide power supply, followed by tandem with the base station-duplex ports and the launch of mobile-duplex between the downlink driver amplifier, downlink channel election Optional, proximal optical transceivers, fiber, remote optical transceiver, power amplifier and mobile downlink - diplexer constitute downlink; followed in the mobile-duplex serial-port and base stations receiving end diplexer uplink between the low-noise amplifier, remote optical transceiver, optical fiber, optical transceiver proximal, uplink driver amplifier and uplink channel selector constitute uplinks; each of the proximal source control module interface with intelligent monitoring proximal control interface module attached to the distal end of each module of the remote control interface with intelligent monitoring control interface module connected.
Description
Technical field
The present invention relates to a kind of mobile communication radio frequency transmission equipment, particularly a kind of WCDMA optical fiber repeater.
Background technology
Growing along with mobile communication market professionally developed into value-added service from original voice service.Be accompanied by the continuous development of mobile value-added service, the 3G that marches toward (3rd Generation, 3G (Third Generation) Moblie) then is the inevitable choice of mobile operator.With preceding two generation system compare, the principal character of 3-G (Generation Three mobile communication system) is that colourful mobile multi-media service can be provided, its transmission rate is supported 144kb/s in high-speed mobile environment, walking is supported 384kb/s in the mobile environment at a slow speed, supports 2Mb/s under the inactive state.Its design object is for power system capacity, the better communication quality bigger than second-generation system is provided, and want to realize seamless roam in the world better and, also will consider favorable compatibility simultaneously with existing second-generation system for the user provides the multiple business that comprises speech, data and multimedia etc.
The 3G standard of International Telecommunication Association's acceptance at present mainly contains following three kinds: WCDMA, CDMA2000 and TD-SCDMA.CDMA is the abbreviation of Code Division Multiple Access (code division multiple access), is the technical foundation of 3-G (Generation Three mobile communication system).First generation mobile communication system adopts the analogue modulation system of frequency division multiple access (FDMA), and the major defect of this system is that the availability of frequency spectrum is low, and signaling is disturbed voice service.Second generation mobile communication system mainly adopts the digital modulation mode of time division multiple access (TDMA), improved power system capacity, and adopted independent channel to transmit signaling, systematic function is greatly improved, but the power system capacity of TDMA is still limited, and handover switching performance is imperfection still.Characteristics such as cdma system is simple with its frequency planning, power system capacity is big, frequency reuse is high, ability of anti-multipath is strong, good communication quality, soft capacity, soft handover demonstrate huge development potentiality.
The WCDMA full name is Wideband CDMA, and this is based on the 3G technology standard that the GSM net develops out, is the wideband CDMA technology that Europe proposes.This standard has proposed the evolution strategy of GSM (2G)-GPRS-EDGE-WCDMA (3G).GPRS is the abbreviation of General PacketRadio Service (GPRS), EDGE is the abbreviation of Enhanced Datarate for GSM Evolution (strengthening the GSM evolution of data rate), and these two kinds of technology are called as 2.5 third-generation mobile communication technology.China Mobile has been GPRS network and EDGE network with original GSM network upgrade at present.
The repeater equipment of 2G is by a large amount of utilizations at present, 2G repeater accepted standard is " ETSI EN300 609 ", " repeater specification requirement of 900/1800MHzTDMA digital mobile cellular telecommunication net and method of measurement " and " repeater specification requirement of 800MHzCDMA digital mobile cellular telecommunication net and method of measurement ", and 3G repeater institute accepted standard is " 3GPPTS25.143 " and " repeater specification requirement of WCDMA digital mobile cellular telecommunication net and method of measurement " (declaration original text), standard to 2G repeater and 3G repeater compares, its main difference is: 1, the linearity of 3G repeater requires high, requires very high to spuious control especially.2, the anti-interference requirement of 3G repeater is high.3, the 3G repeater requires height to the adaptability that input signal strength changes.Therefore, the 3G repeater is higher to the technical requirement of internal module, and is stricter, requires to have good inheritability, extensibility, can realize the smooth upgrade of 2G, can carry out collaborative work and carry out the network optimization easily with the mobile communications network core, base station well to 3G.Complete machine has very strong self-protection function, and the work to whole network does not bring negative interference.Simultaneously, do not make complete machine be subjected to fatal damage because the work of certain part in the repeater is undesired yet.
Because electromagnetic loss, each signal of base station coverage is limited; In addition, because the shadow effect of radio transmission, the behind that is directed at some obstacles such as high mountain, building, the woods also often forms covering shadow region and the blind zone problem that large-scale tall buildings things such as signal blind zone and mountain area, villa, highway, tourist district, holiday village, market place builet below the ground, hotel etc. are located.
Summary of the invention
The base station covers not enough in the cellular mobile network in order to remedy, extend base station coverage area, eliminate communication blind district, radio-frequency enabled good, high-fidelity is provided, effectively expand the coverage area, eliminate coverage hole, improve speech quality, lay 3G network for operator and reduce cost, the present invention aims to provide a kind of WCDMA optical fiber repeater of the WCDMA of being applicable to mobile communication system.
It is made of the near-end machine 30 and the remote termination 40 that connect by optical fiber 50, near-end machine 30 and remote termination 40 all have one to provide the power supply Switching Power Supply for other each module, wherein, near-end machine 30 also comprises near-end intelligent monitor 1, base station end duplexer 2, downlink drive amplifier 3, down channel selector 4, near-end optical transceiver 5, goes up line driver amplifier 6 and up channel selector 7, and remote termination 40 comprises far-end intelligent monitor 12, far-end optical transceiver 13, downlink power amplifier 14, mobile terminal duplexer 15 and up low noise amplifier 16; The emission port and the downlink drive amplifier 3 between the mobile terminal duplexer 15, down channel selector 4, near-end optical transceiver 5, optical fiber 50, far-end optical transceiver 13, downlink power amplifier 14 and the mobile terminal duplexer 15 that are connected on base station end duplexer 2 successively constitute down link; The receiving port and the up low noise amplifier 16 between the base station end duplexer 2, far-end optical transceiver 13, optical fiber 50, near-end optical transceiver 5, last line driver amplifier 6 and the up channel selector 7 that are connected on mobile terminal duplexer 15 successively constitute up links;
The light transmit port of near-end optical transceiver 5 links to each other with down channel selector 4, and the FSK modulation port links to each other with the monitor-interface of near-end intelligent monitor 1, and the light-receiving port links to each other with last line driver amplifier 6, and the WDM port links to each other with optical fiber 50; The light transmit port of far-end optical transceiver 13 links to each other with downlink power amplifier 14, and the FSK modulation port links to each other with the monitor-interface of far-end intelligent monitor 12, and the light-receiving port links to each other with up low noise amplifier 16, and the WDM port links to each other with optical fiber 50.
The monitor-interface that source module is respectively arranged of near-end machine 30 links to each other with the monitor-interface of near-end intelligent monitored control module 1 respectively, and the monitor-interface that source module is respectively arranged of remote termination 40 links to each other with the monitor-interface of far-end intelligent monitored control module 12 respectively.
At down link, enter the BS port by obtaining downstream signal with the base station coupling, export by its TX end through base station end duplexer 2 backs, through downlink drive amplifier 3 signal of constant intensity is sent into down channel selector 4 then, selected by down channel selector 4 behind the channel of required amplification again that the electricity/light conversion (E/O) by near-end optical transceiver 5 becomes light signal to electrical signal conversion, the light signal after the conversion is delivered to remote termination 40 by optical fiber 50; The far-end optical transceiver 13 of remote termination 40 goes back to the signal of telecommunication with input optical signal by light/electricity conversion (O/E), import downlink power amplifier 14 again, by input mobile terminal duplexer 15 behind the linear amplification of power amplifier, send into transmitting antenna, coverage goal zone by the output of MS port at last.In up link, the upward signal that receives mobile phone from antenna enters the MS port of remote termination 50, import up low noise amplifier 16 through mobile terminal duplexer 15 backs by its RX port, electricity/light conversion (E/O) by far-end optical transceiver 13 becomes light signal to electrical signal conversion again, light signal after the conversion is delivered to near-end machine 30 by optical fiber 50, the near-end optical transceiver 5 of near-end machine 30 goes back to the signal of telecommunication with input optical signal by light/electricity conversion (O/E), send into line driver amplifier 6 again, input up channel selector 7, select input base station end duplexer 2 behind the working channel by up channel selector 7, at last by the BS port output of base station end duplexer 2.All source modules that have all have monitor-interface, by monitoring module it are implemented data acquisition and control, finally can be by this locality and the remote monitoring of software realization to equipment.
It designs according to relevant repeater standard and national regulation among the 3GPP, the near-end machine is placed near the base station, by forward signal being zoomed into suitable size with the base station coupling, through the amplification module of overdriving, signal is exported with constant intensity, by electricity/light conversion electrical signal conversion is become light signal again, the light signal after the conversion is delivered to remote termination by optical fiber.Remote termination goes back to the signal of telecommunication with input optical signal by light/electricity, enters radio frequency (RF) unit and amplifies, and signal is sent into transmitting antenna, the coverage goal zone after amplifying.In backward chaining, these operating process are just in time opposite.Complete machine has artificial gain controlling of 30dB MGC and ALC control control, realizes power invariability output, avoids interference the base station.
Description of drawings
Fig. 1 is a system configuration schematic diagram of the present invention;
Fig. 2 is a near-end machine structural representation of the present invention;
Fig. 3 is a remote termination structural representation of the present invention.
Embodiment
As Fig. 1, Fig. 2 and shown in Figure 3, it is made of the near-end machine 30 and the remote termination 40 that connect by optical fiber 50, near-end machine 30 and remote termination 40 all have one to provide the power supply Switching Power Supply for other each module, wherein, near-end machine 30 also comprises near-end intelligent monitor 1, base station end duplexer 2, downlink drive amplifier 3, down channel selector 4, near-end optical transceiver 5, last line driver amplifier 6 and up channel selector 7, remote termination 40 comprises far-end intelligent monitor 12, far-end optical transceiver 13, downlink power amplifier 14, mobile terminal duplexer 15 and up low noise amplifier 16; The emission port and the downlink drive amplifier 3 between the mobile terminal duplexer 15, down channel selector 4, near-end optical transceiver 5, optical fiber 50, far-end optical transceiver 13, downlink power amplifier 14 and the mobile terminal duplexer 15 that are connected on base station end duplexer 2 successively constitute down link; The receiving port and the up low noise amplifier 16 between the base station end duplexer 2, far-end optical transceiver 13, optical fiber 50, near-end optical transceiver 5, last line driver amplifier 6 and the up channel selector 7 that are connected on mobile terminal duplexer 15 successively constitute up links;
The light transmit port of near-end optical transceiver 5 links to each other with down channel selector 4, and the FSK modulation port links to each other with the monitor-interface of near-end intelligent monitor 1, and the light-receiving port links to each other with last line driver amplifier 6, and the WDM port links to each other with optical fiber 50; The light transmit port of far-end optical transceiver 13 links to each other with downlink power amplifier 14, and the FSK modulation port links to each other with the monitor-interface of far-end intelligent monitor 12, and the light-receiving port links to each other with up low noise amplifier 16, and the WDM port links to each other with optical fiber 50.
The monitor-interface that source module is respectively arranged of near-end machine 30 links to each other with the monitor-interface of near-end intelligent monitored control module 1 respectively, and the monitor-interface that source module is respectively arranged of remote termination 40 links to each other with the monitor-interface of far-end intelligent monitored control module 12 respectively.
At down link, enter the BS port by obtaining downstream signal with the base station coupling, export by its TX end through base station end duplexer 2 backs, through downlink drive amplifier 3 signal of constant intensity is sent into down channel selector 4 then, selected by down channel selector 4 behind the channel of required amplification again that the electricity/light conversion (E/O) by near-end optical transceiver 5 becomes light signal to electrical signal conversion, the light signal after the conversion is delivered to remote termination 40 by optical fiber 50; The far-end optical transceiver 13 of remote termination 40 goes back to the signal of telecommunication with input optical signal by light/electricity conversion (O/E), import downlink power amplifier 14 again, by input mobile terminal duplexer 15 behind the linear amplification of power amplifier, send into transmitting antenna, coverage goal zone by the output of MS port at last.In up link, the upward signal that receives mobile phone from antenna enters the MS port of remote termination 50, import up low noise amplifier 16 through mobile terminal duplexer 15 backs by its RX port, electricity/light conversion (E/O) by far-end optical transceiver 13 becomes light signal to electrical signal conversion again, light signal after the conversion is delivered to near-end machine 30 by optical fiber 50, the near-end optical transceiver 5 of near-end machine 30 goes back to the signal of telecommunication with input optical signal by light/electricity conversion (O/E), send into line driver amplifier 6 again, input up channel selector 7, select input base station end duplexer 2 behind the working channel by up channel selector 7, at last by the BS port output of base station end duplexer 2.All source modules that have all have monitor-interface, by monitoring module it are implemented data acquisition and control, finally can be by this locality and the remote monitoring of software realization to equipment.
System index of the present invention can satisfy relevant repeater standard and national regulation among the 3GPP:
Because optical fiber repeater is coupled mode repeater, base station,, guarantee that amplifying the back from the signal that antenna end receives also has good signal-to noise ratio so the up link prime adopts the low noise Linear magnifying technology in high in design; The lock that adopts high stability in channel selection module is to frequency transform techniques, and the intermediate frequency Surface Acoustic Wave Filter of high inhibition degree, makes system have extremely strong selectivity and anti-interference, and equipment input intermodulation has been made contribution with the index of exporting intermodulation; Adopt the multinomial filter of composite type, make system's selectivity good, increased the receive-transmit isolation of equipment.Because in the WCDMA system, pilot power only accounts for 1/10th of whole power output, causes the variation of input power of WCDMA repeater quite big.The present invention drives the enlarging function module with WCDMA and is prepended to before the channel selector, and increases the ALC controlled function therein.This unique circuit scheme can make the spuious index of WCDMA repeater and intermodulation can not change because of the intensity of input signal, has guaranteed the technical parameter of WCDMA complete machine.
In some applied environment, because a large amount of existence of PHS, its downstream frequency is 1910MHz ~ 1915MHz, only differ 5MHz with the least significant end of 2GHz WCDMA upstream frequency 1920MHz ~ 1980MHz, if 2GHz WCDMA direct end uplink channel does not have very high inhibition to the PHS downstream signal, as this repeater and PHS altogether during the location, because the strength ratio upward signal of downstream signal is big, can cause direct end uplink to get clogged, to making the repeater cisco unity malfunction.The WCDMA repeater technology overall plan that the present invention works in 2GHz at first has been concerned about this problem, the mobile terminal duplexer adopts the asymmetry high-band high Q value of degree of inhibition duplexer outward, this duplexer adopts the coaxial cavity filtered version, 15 grades of filter order, sideband suppression is high, the average power that can pass through is 100W, and peak power reaches 200W;
Because the nonlinear distortion of radio-frequency power amplifier can make it produce new frequency component, as producing second harmonic and double-tone beat frequency for second-order distortion, can produce triple-frequency harmonics and multitone beat frequency for third order distortion.These new frequency components will be disturbed the signal of other frequency ranges as dropping in the passband.So the WCDMA repeater is very high to the requirement of the linearity, in order to satisfy this class index request, takes into account linearity and efficient simultaneously, the present invention carries out linearization process to power amplifier, and the mode of utilization back-off and predistortion is carried out.Power tube that will more high-power (as 80W) is used for the power amplifier module of smaller power (as 16W), and the 1dB compression point of power tube 10 decibels of having drawn back, the work that makes amplifirer enters linear zone away from the saturation region like this.Simultaneously, the predistortion linear technology is applied on the power amplifier, and the device that has added predistortion at the front end of power amplifier module is handled, in order to the nonlinear distortion of compensation power amplifier, improve the linearisation degree of multi-carrier power amplifier greatly, also effectively improved the spurious emissions index of power amplifier simultaneously.
Select for use high stability crystal oscillator as frequency reference, guarantee that whole system frequency reference Deviation Control is at very low range.Equipment is made of the reflective module of series connection; the input/output port of module is from capacitive character and inductive mutual compensation control port standing wave of high-frequency circuit; part has the port of source module to add isolator; to improve matching and to protect related device; mutually coupling makes the standing wave of equipment functional, make various microwave signals in the POI system as far as possible to go the state transfer of ripple.Prime adopts the low noise Linear magnifying technology in high in the design of repeater, guarantees the noise factor≤5dB of complete machine; In channel selection module, selected the intermediate frequency Surface Acoustic Wave Filter of high inhibition degree for use, make system have extremely strong selectivity and anti-interference, equipment reaches 45dB in the inhibition that departs from channel marginal frequency ± 0.78MHz place, the band that the has guaranteed equipment index that gains outward, promptly during the signal outside the repeater receives working range, its amplifying power is subjected to suitable restriction, can not form useful signal and disturb.Index contribution for the input intermodulation is huge, particularly is the interference signal of 921-960MHz or 1805-1880dBm for frequency, and when the intensity of input reached 16dBm, it was to the interference effect≤10dB in the band of repeater.The equipment that guaranteed so can not be subjected to the influence of GSM/DCS signal when being total to the location with the GSM/DCS system.In channel is selected module, used the high stability crystal oscillator as the frequency reference benchmark, guaranteed the frequency error of repeater≤± 0.01ppm; Because driving the enlarging function module, WCDMA in system, place channel to select before the module, and have an ALC controlled function, so after input signal changes, owing to drive the ALC function in the amplification module, tractor parameter enters channel and selects the signal strength signal intensity of module not change, so also can not change.Particularly for spuious index, in the ordinary course of things, spuious parameter obviously worsens along with the increase of input signal, but in this equipment, input signal increases 10dB, and stray parameter does not have to change substantially.Adopted degree of inhibition duplexer outside the asymmetry high-band at the MS end, because the progression of coaxial cavity is high especially, low side departs from the inhibition Du Keda 25dB of sideband 5MHz, can effectively suppress the downstream signal of PHS, has solved abnormal problem of working when conventional WCDMA repeater and PHS are total to the location.The linearization problem of multi-carrier power amplifier also is a difficult problem in the WCDMA repeater, in order to solve this difficult problem, the present invention has increased the linearisation predistortion processing circuit in the power amplifier module of WCDMA repeater, thereby solved the linearization problem of multi-carrier power amplifier preferably, obtained multicarrier linear power amplifier preferably.Guarantee that when 2 carrier waves and 3 carrier waves are worked simultaneously the spurious emissions index of power amplifier can satisfy the requirement of 3GPP intermediate frequency spectrum emission template fully.
Its key is: will more powerful power tube in the downlink power amplifier 14 be used for the power amplifier module of smaller power, the 1dB compression point of power tube 10 decibels of having drawn back are to guarantee that power tube work away from the saturation region, enters linearity and goes.The device that in the front-end circuit of downlink power amplifier 14, has added simultaneously predistortion.Mobile terminal duplexer 15 adopts the asymmetry high-band high Q value of degree of inhibition duplexer outward, and this duplexer adopts the coaxial cavity filtered version, and 15 grades of filter order have high sideband suppression, and the average power that can pass through is 100W, and peak power reaches 200W.Last line driver amplifier 6, downlink drive amplifier 3 place respectively before up channel selector 7 and the down channel selector 4, and increase the ALC controlled function therein.
Claims (5)
1, a kind of WCDMA optical fiber repeater, it is made of near-end machine (30) that connects by optical fiber (50) and remote termination (40), and near-end machine (30) and remote termination (40) all have one for other each module provides the power supply Switching Power Supply, it is characterized in that:
A, described near-end machine (30) also comprise near-end intelligent monitor (1), base station end duplexer (2), downlink drive amplifier (3), down channel selector (4), near-end optical transceiver (5), go up line driver amplifier (6) and up channel selector (7), and remote termination (40) comprises far-end intelligent monitor (12), far-end optical transceiver (13), downlink power amplifier (14), mobile terminal duplexer (15) and up low noise amplifier (16); The emission port and the downlink drive amplifier (3) between the mobile terminal duplexer (15), down channel selector (4), near-end optical transceiver (5), optical fiber (50), far-end optical transceiver (13), downlink power amplifier (14) and the mobile terminal duplexer (15) that are connected on base station end duplexer (2) successively constitute down link; The receiving port and the up low noise amplifier (16) between the base station end duplexer (2), far-end optical transceiver (13), optical fiber (50), near-end optical transceiver (5), last line driver amplifier (6) and the up channel selector (7) that are connected on mobile terminal duplexer (15) successively constitute up link;
The light transmit port of B, described near-end optical transceiver (5) links to each other with down channel selector (4), the FSK modulation port links to each other with the monitor-interface of near-end intelligent monitor (1), the light-receiving port links to each other with last line driver amplifier (6), and the WDM port links to each other with optical fiber (50); The light transmit port of far-end optical transceiver (13) links to each other with downlink power amplifier (14), the FSK modulation port links to each other with the monitor-interface of far-end intelligent monitor (12), the light-receiving port links to each other with up low noise amplifier (16), and the WDM port links to each other with optical fiber (50);
The monitor-interface that source module is respectively arranged of C, described near-end machine (30) links to each other with the monitor-interface of near-end intelligent monitored control module (1) respectively, and the monitor-interface that source module is respectively arranged of remote termination (40) links to each other with the monitor-interface of far-end intelligent monitored control module (12) respectively.
2, a kind of WCDMA optical fiber repeater as claimed in claim 1, it is characterized in that: the power tube work of described downlink power amplifier (14) enters linear zone away from the saturation region, and its front end has added the device of predistortion.
3, as a kind of WCDMA optical fiber repeater of claim 1 or 2, it is characterized in that: more powerful power tube is used for the power amplifier module of smaller power in the described downlink power amplifier (14), the 1dB compression point of power tube 10 decibels of having drawn back.
4, as a kind of WCDMA optical fiber repeater of claim 1 or 2, it is characterized in that: described mobile terminal duplexer (15) adopts the asymmetry high-band high Q value of degree of inhibition duplexer outward, this duplexer adopts the coaxial cavity filtered version, 15 grades of filter order, has high sideband suppression, the average power that can pass through is 100W, and peak power reaches 200W.
5, as a kind of WCDMA optical fiber repeater of claim 1 or 2, it is characterized in that: described upward line driver amplifier (6), downlink drive amplifier (3) place up channel selector (7) and down channel selector (4) respectively before, and increase the ALC controlled function therein.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006100245396A CN101034943A (en) | 2006-03-09 | 2006-03-09 | WCDMA optical fiber direct amplifying station |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006100245396A CN101034943A (en) | 2006-03-09 | 2006-03-09 | WCDMA optical fiber direct amplifying station |
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| CN101034943A true CN101034943A (en) | 2007-09-12 |
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| CNA2006100245396A Pending CN101034943A (en) | 2006-03-09 | 2006-03-09 | WCDMA optical fiber direct amplifying station |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101888273A (en) * | 2010-07-14 | 2010-11-17 | 南京泰通电子科技有限公司 | Optical transmitter and receiver with Ethernet function |
| CN101951284A (en) * | 2010-10-12 | 2011-01-19 | 奥维通信股份有限公司 | Remote power supply system for repeater |
| CN101599799B (en) * | 2009-07-01 | 2011-12-21 | 耿直 | Store-and-forward fiber optic repeater working method and store-and-forward fiber optic repeater |
| CN102457458A (en) * | 2010-10-14 | 2012-05-16 | 大唐移动通信设备有限公司 | Digital pre-distortion realization method of base station and apparatus thereof |
| CN101729150B (en) * | 2009-11-18 | 2012-06-13 | 耿直 | Transmission treatment method of optical fiber repeater and variable-channel transmission optical fiber repeater |
| CN104901743A (en) * | 2015-05-04 | 2015-09-09 | 中国科学院国家授时中心 | Fiber optical frequency transmission method based on compensation of remote end |
| CN106301581A (en) * | 2016-07-29 | 2017-01-04 | 四川天邑康和通信股份有限公司 | The digital fiber remote termination that a kind of two-way signaling amplifies |
| CN106936490A (en) * | 2016-12-27 | 2017-07-07 | 南京泰通科技股份有限公司 | Dual-port GSM R digital optical fiber direct station equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101599799B (en) * | 2009-07-01 | 2011-12-21 | 耿直 | Store-and-forward fiber optic repeater working method and store-and-forward fiber optic repeater |
| CN101729150B (en) * | 2009-11-18 | 2012-06-13 | 耿直 | Transmission treatment method of optical fiber repeater and variable-channel transmission optical fiber repeater |
| CN101888273A (en) * | 2010-07-14 | 2010-11-17 | 南京泰通电子科技有限公司 | Optical transmitter and receiver with Ethernet function |
| CN101951284A (en) * | 2010-10-12 | 2011-01-19 | 奥维通信股份有限公司 | Remote power supply system for repeater |
| CN102457458A (en) * | 2010-10-14 | 2012-05-16 | 大唐移动通信设备有限公司 | Digital pre-distortion realization method of base station and apparatus thereof |
| CN102457458B (en) * | 2010-10-14 | 2015-08-12 | 大唐移动通信设备有限公司 | The implementation method of a kind of base station digital pre-distortion and device |
| CN104901743A (en) * | 2015-05-04 | 2015-09-09 | 中国科学院国家授时中心 | Fiber optical frequency transmission method based on compensation of remote end |
| CN104901743B (en) * | 2015-05-04 | 2018-02-23 | 中国科学院国家授时中心 | A kind of optical fiber optical frequency transmission method based on long-range end compensating |
| CN106301581A (en) * | 2016-07-29 | 2017-01-04 | 四川天邑康和通信股份有限公司 | The digital fiber remote termination that a kind of two-way signaling amplifies |
| CN106936490A (en) * | 2016-12-27 | 2017-07-07 | 南京泰通科技股份有限公司 | Dual-port GSM R digital optical fiber direct station equipment |
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