CN2867728Y - SCDMA fiber-optical high-frequency-amplification station - Google Patents
SCDMA fiber-optical high-frequency-amplification station Download PDFInfo
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- CN2867728Y CN2867728Y CNU2005201428253U CN200520142825U CN2867728Y CN 2867728 Y CN2867728 Y CN 2867728Y CN U2005201428253 U CNU2005201428253 U CN U2005201428253U CN 200520142825 U CN200520142825 U CN 200520142825U CN 2867728 Y CN2867728 Y CN 2867728Y
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Abstract
The utility model provides a SCDMA optical fiber repeater. The SCDMA optical fiber repeater comprises a SCDMA base receiver/transmitter subsystem BTS, a coupler connected with the BTS, a local feed line and a donor connected with the coupler, a remote terminal connected with a remote retransmitting antenna, and an optical fiber for connecting the donor and the remote terminal, wherein the donor receives the down signals of the BTS through the coupler, and transmits them to the remote terminal through the optical fiber after photoelectric conversion; and the remote terminal subjects the signals to electro-optic conversion and power amplification and transmits them through the retransmitting antenna. The remote terminal also subjects up signals received by the retransmitting antenna to low-noise amplification and electro-optic conversion and transmits them to the donor through the optical fiber, and the donor subjects the signals to photoelectric conversion and transmits then to the BTS. The utility model overcomes the disadvantages of the conventional SCDMA optical fiber repeater.
Description
Technical field
The utility model relates to moving communicating field, and particularly Mobile communication direct base station relates to a kind of SCDMA optical fiber repeater concretely.
Background technology
Along with the communicate by letter raising of the level of consumption of people, people grow with each passing day to the demand of mobile communication, and are more and more higher to the requirement of mobile communication quality, and this just requires operator to improve the mobile radio communication quality, expands the coverage area.How to improve the mobile radio communication quality, expand the coverage area, become an important topic of each operator.
Because the mobile communication base station can be subjected to the influence of various objective factors such as landform, building to air-launched electromagnetic wave signal, can not cover each corner that the stream of people can arrive, as highway, conference centre, basement, airport, station, tunnel, subway, tourist district etc.In order to remedy this defective, can increase the number of base station, but the shortcoming of setting up the base station is: the construction base station costs an arm and a leg, the cycle is long; Increase operating cost of operator; Especially in the little area of telephone traffic, it is very unfavorable that competitive strength is improved in operator.
At present, can utilize this communication equipment with low cost of Mobile communication direct base station, solve the matter of great urgency of operator.The repeater is a kind of relaying product, is meant to play a kind of radio transmission transferring equipment that signal strengthens in the wireless communication transmissions process.The basic function of repeater is exactly a radiofrequency signal power intensifier.The repeater by pickoff signals in the existing overlay area of donor antenna,, is transmitted into the signal of filtering once more after power amplifier amplifies and treats the overlay area carrying out fabulous isolation with logical outer signal by band pass filter in down link.In the uplink path, the signal of the travelling carriage mobile phone in the overlay area is transmitted into corresponding base station with same working method after by up amplification link processing, thereby reaches the signal transmission of base station and mobile phone.The use repeater mainly is because use repeater one is to guarantee the network coverage under the prerequisite that does not increase base station number as one of necessary means that realizes " low capacity, the big covering " target, the 2nd, and its cost is well below the micro cellular system that effect same is arranged.Advantages such as simple in structure, that investment is less and easy for installation have been compared with the base station, can be widely used in the blind area and the weak district that are difficult to cover, as various places such as market, hotel, airport, harbour, station, gymnasium, amusement hall, subway, tunnel, highway, islands, improve communication quality, solve problems such as call drop.
In the SCDMA communication system, adopt the SCDMA wireless discharging-directly station at present, as shown in Figure 1, 2, be the operation principle schematic diagram of existing SCDMA wireless discharging-directly station.
Wherein, the principle of wireless discharging-directly station is that descending the amplification to mobile phone by the wireless receiving base station signal receives, otherwise, up by sending to the base station reception with wireless after the amplification of reception mobile phone signal, can save investment greatly by adopting this wireless discharging-directly station, solve that the base station covers and a kind of mode of having signal blind zone, but also there is following defective in this SCDMA wireless discharging-directly station:
The wireless receiving signal level require high RXL 〉=-65dBm, it is high that signal quality SNR (Signal-to-Noise Ratio, signal to noise ratio) requires;
2. because of wireless receiving, easily introduce and disturb, speech quality is poor;
3. in order to guarantee that there is good output the repeater, avoid system directly to swash, dual-mode antenna needs high insulation request;
4. consider system's transmitting-receiving insulation request, so the siting of station requires height, the owner coordinates difficulty;
5. adopt shift frequency in the band, need take extra frequency of SCDMA base station system and channel resource simultaneously;
6. system's transmitting-receiving is limited, is generally one and receives one, can not well look area of coverage requirement and adopt the flexible antenna coverage mode;
7. because adopt wireless receiving, entire system SNR is relatively poor, effectively covering radius less when weak (be signal can't guarantee speech quality);
8. single networking mode can't be realized the covering of large tracts of land zones of different.
The utility model content
The purpose of this utility model is to provide a kind of SCDMA optical fiber repeater, to remedy the deficiencies in the prior art.
The utility model provides a kind of SCDMA optical fiber repeater, comprising:
SCDMA BTS under CROS environment BTS, the coupler that is connected with this BTS under CROS environment BTS, the local feeder line that is connected with this coupler and near-end machine, at least one remote termination that is connected with the far-end retransmitting antenna and the optical fiber that connects described near-end machine and remote termination; Wherein,
Described near-end machine receives the downstream signal of SCDMA BTS under CROS environment BTS through coupler, through electric light conversion back by described Optical Fiber Transmission to remote termination, in described remote termination, carry out opto-electronic conversion and power amplification after, launch by retransmitting antenna;
After the upward signal that described remote termination receives described retransmitting antenna carries out that low noise amplifier amplifies and electric light changes, to the near-end machine, be sent to SCDMA BTS under CROS environment BTS after in this near-end machine, carrying out opto-electronic conversion through described Optical Fiber Transmission.
Described near-end machine comprises: filter, the TDD transmitting-receiving lock unit that is connected with this filter, light Transmit-Receive Unit and the wavelength division multiplexer receiving and dispatching up pushing unit that lock unit is connected and descending pushing unit, be connected with described up, descending pushing unit with described TDD; Wherein,
The downlink radio-frequency signal that described SCDMA BTS under CROS environment BTS sends inputs to described filter through coupler, filtering radio frequency out of band signal in this filter; Filtered signal is inputed to descending pushing unit through described TDD transmitting-receiving lock unit, send into described smooth Transmit-Receive Unit and wavelength division multiplexer again and carry out the electric light conversion, then, the light signal after the conversion is transported to described remote termination through optical fiber;
The light Transmit-Receive Unit of described near-end machine and wavelength division multiplexer receive the light signal of described remote termination simultaneously, and carry out opto-electronic conversion, export the signal of telecommunication after the conversion to SCDMA BTS under CROS environment BTS through described up pushing unit, TDD transmitting-receiving lock unit, filter.
Described near-end machine also comprises monitoring unit, this monitoring unit and described TDD transmitting-receiving lock unit with descending, pushing unit is connected up and down, be used for the near-end machine is carried out overall monitor.
Described remote termination comprises: light Transmit-Receive Unit and wavelength division multiplexer, power amplifier, low noise amplifier, TDD transmitting-receiving lock unit and filter; Wherein,
Described smooth Transmit-Receive Unit and wavelength division multiplexer receive the downlink optical signal of optical fiber transmission and carry out opto-electronic conversion, the signal of telecommunication after the conversion is become required power level signal through described power amplifier, and, launch by described retransmitting antenna by described TDD transmitting-receiving lock unit and filter;
Described retransmitting antenna receives upward signal, sends into described filter, filtering radio frequency out of band signal in this filter; Filtered signal is sent into described low noise amplifier through described TDD transmitting-receiving lock unit, be amplified to certain level signal, then this signal is sent into described smooth Transmit-Receive Unit and wavelength division multiplexer and carried out the electric light conversion, the light signal after the conversion is transported to described near-end machine through optical fiber.
Described remote termination also comprises monitoring unit, and this monitoring unit is connected with low noise amplifier with described TDD transmitting-receiving lock unit, power amplifier, and this remote termination is carried out overall monitor.
The utility model also provides a kind of SCDMA optical fiber direct amplification machine, comprising: near-end machine, at least one remote termination that is connected with the far-end retransmitting antenna and the optical fiber that connects described near-end machine and remote termination; Wherein,
Described near-end machine receives the downstream signal of SCDMA BTS under CROS environment BTS through coupler, carry out electric light conversion back by described Optical Fiber Transmission to remote termination, in described remote termination, carry out opto-electronic conversion and power amplification after, launch by retransmitting antenna;
After the upward signal that described remote termination receives described retransmitting antenna carries out that low noise amplifier amplifies and electric light changes, to the near-end machine, be sent to SCDMA BTS under CROS environment BTS after in this near-end machine, carrying out opto-electronic conversion through described Optical Fiber Transmission.
Described near-end machine comprises: filter, the TDD transmitting-receiving lock unit that is connected with this filter, light Transmit-Receive Unit and the wavelength division multiplexer receiving and dispatching up pushing unit that lock unit is connected and descending pushing unit, be connected with described up, descending pushing unit with described TDD; Wherein,
The downlink radio-frequency signal that described SCDMA BTS under CROS environment BTS sends inputs to described filter through coupler, filtering radio frequency out of band signal in this filter; Filtered signal is inputed to descending pushing unit through described TDD transmitting-receiving lock unit, send into described smooth Transmit-Receive Unit and wavelength division multiplexer again and carry out the electric light conversion, then, the light signal after the conversion is transported to described remote termination through optical fiber;
The light Transmit-Receive Unit of described near-end machine and wavelength division multiplexer receive the light signal of described remote termination simultaneously, and carry out opto-electronic conversion, export the signal of telecommunication after the conversion to SCDMA BTS under CROS environment BTS through described up pushing unit, TDD transmitting-receiving lock unit, filter.
Described near-end machine also comprises monitoring unit, this monitoring unit and described TDD transmitting-receiving lock unit with descending, pushing unit is connected up and down, be used for this near-end machine is carried out overall monitor.
Described remote termination comprises: light Transmit-Receive Unit and wavelength division multiplexer, power amplifier, low noise amplifier, TDD transmitting-receiving lock unit and filter; Wherein,
Described smooth Transmit-Receive Unit and wavelength division multiplexer receive the downlink optical signal of optical fiber transmission and carry out opto-electronic conversion, the signal of telecommunication after the conversion is become required power level signal through described power amplifier, and, launch by described retransmitting antenna by described TDD transmitting-receiving lock unit and filter;
Described retransmitting antenna receives upward signal, sends into described filter, filtering radio frequency out of band signal in this filter; Filtered signal is sent into described low noise amplifier through described TDD transmitting-receiving lock unit, be amplified to certain level signal, then this signal is sent into described smooth Transmit-Receive Unit and wavelength division multiplexer and carried out the electric light conversion, the light signal after the conversion is transported to described near-end machine through optical fiber.
Described remote termination also comprises monitoring unit, and this monitoring unit is connected with low noise amplifier with described TDD transmitting-receiving lock unit, power amplifier, is used for this remote termination is carried out overall monitor.
The working frequency range of this SCDMA optical fiber direct amplification machine is 1785～1805MHz.
Described smooth Transmit-Receive Unit and wavelength division multiplexer adopt single fiber transmission or two fine transmission.
Described near-end machine includes power subsystem and the mains switch that is connected with this power subsystem with remote termination; Wherein,
Described power subsystem is used for the alternating current of external world's input is converted to direct current;
In the near-end machine, described mains switch is connected with monitoring unit with descending pushing unit, light Transmit-Receive Unit and wavelength division multiplexer with described TDD transmitting-receiving lock unit, up pushing unit respectively by power line;
In remote termination, described mains switch is connected with monitoring unit with power amplifier, light Transmit-Receive Unit and wavelength division multiplexer with described TDD transmitting-receiving lock unit, low noise amplifier respectively by power line.
The beneficial effects of the utility model are:
1. the base station signal that directly is coupled, dead level and SNR requirement;
2. the base station signal that directly is coupled, the spectral purity height, speech quality can compare favourably with the base station;
3. system adopts Optical Fiber Transmission, and system does not have the transmitting-receiving insulation request;
4. system does not have insulation request, and website is selected flexibly;
5. with the transparent amplification in base station, the sharing base channel resource does not take SCDMA base station system extra frequency and signal resource;
6. do not have insulated degree requirement, can adopt omnidirectional antenna and directional antenna (1 fan and many sectors) coverage mode flexibly according to the area of coverage;
7. employing Optical Fiber Transmission, entire system SNR is covering radius big when weak (be signal also can guarantee good speech quality) better effectively;
8. can adopt a near-end machine to drag a plurality of remote terminations according to the overlay area size, can realize the wide covering of large tracts of land zones of different.
Description of drawings
Fig. 1 is existing SCDMA wireless discharging-directly station structural representation;
Fig. 2 is the wireless direct amplification machine fundamental diagram of existing SCDMA;
Fig. 3 is the SCDMA optical fiber repeater fundamental diagram of the utility model embodiment;
Fig. 4 is the SCDMA optical fiber direct amplification machine fundamental diagram of the utility model embodiment;
Fig. 5 is the internal structure schematic diagram of the near-end machine of the utility model embodiment;
Fig. 6 is the internal structure schematic diagram of the remote termination of the utility model embodiment;
Fig. 7 A to Fig. 7 C is front view, vertical view and the end view of the near-end machine profile of the utility model embodiment;
Fig. 8 A to Fig. 8 C is front view, vertical view and the end view of the remote termination profile of the utility model embodiment;
Fig. 8 D be the utility model embodiment remote termination install and fix the foot rest schematic diagram;
Fig. 9 is the SCDMA optical fiber repeater fundamental diagram of another embodiment of the utility model.
Embodiment
With reference to accompanying drawing the utility model is elaborated.
Shown in Fig. 3,4, be the fundamental diagram of the SCDMA optical fiber repeater of the utility model embodiment.
A kind of SCDMA optical fiber repeater in the present embodiment comprises:
SCDMA base station, the coupler that is connected with this base station, the local feeder line that is connected with this coupler and near-end machine A, the remote termination B that is connected with the far-end retransmitting antenna and the optical fiber that connects described near-end machine A and remote termination B; Wherein,
Described near-end machine A comprises:
Filter BPF, TDD (Time Division Duplex, time division duplex) the transmitting-receiving lock unit that is connected with this filter, light Transmit-Receive Unit and the wavelength division multiplexer receiving and dispatching up pushing unit A that lock unit is connected and descending pushing unit A, be connected with described TDD with described up, descending pushing unit;
Described remote termination B comprises: light Transmit-Receive Unit and wavelength division multiplexer, power amplifier (PA:PowerAmplifier), low noise amplifier (LNA:Low Noise Amplifier), TDD transmitting-receiving lock unit and filter BPF; Down link (base station is to mobile phone)
The downlink radio-frequency signal that described SCDMA BTS under CROS environment BTS sends is imported described near-end machine A through coupler, earlier filtering radio frequency out of band signal in the described filter of near-end machine A; Filtered signal is inputed to descending pushing unit A through described TDD transmitting-receiving lock unit, send into described smooth Transmit-Receive Unit and wavelength division multiplexer again and carry out the electric light conversion, then, the light signal after the conversion is transported to described remote termination B through optical fiber;
The light Transmit-Receive Unit of described remote termination B and wavelength division multiplexer receive the downlink optical signal of optical fiber transmission and carry out opto-electronic conversion, the signal of telecommunication after the conversion is become required power level signal through described power amplification PA, and, launch by described retransmitting antenna by described TDD transmitting-receiving lock unit and filter BPF.
Up link (mobile phone is to the base station)
Described retransmitting antenna receives upward signal, sends into remote termination B, now filtering radio frequency out of band signal among the described filter BPF of this remote termination B; Filtered signal is sent into described low noise amplifier LNA through described TDD transmitting-receiving lock unit, be amplified to certain level signal, then this signal is sent into described smooth Transmit-Receive Unit and wavelength division multiplexer and carried out the electric light conversion, the light signal after the conversion is transported to described near-end machine A through optical fiber;
The light Transmit-Receive Unit of described near-end machine A and wavelength division multiplexer receive the light signal of described remote termination B, and carry out opto-electronic conversion, export the signal of telecommunication after the conversion to SCDMA BTS under CROS environment BTS through described up pushing unit, TDD transmitting-receiving lock unit, filter BPF.
Be illustrated in figure 5 as the internal structure schematic diagram of the near-end machine of the utility model embodiment.Wherein, near-end machine A also comprises monitoring unit, this monitoring unit and described TDD transmitting-receiving lock unit with descending, pushing unit A is connected up and down, be used for near-end machine A is carried out overall monitor; Also comprise power subsystem and connected mains switch, described mains switch is connected with monitoring unit with descending pushing unit A, light Transmit-Receive Unit and wavelength division multiplexer with described TDD transmitting-receiving lock unit, up pushing unit A respectively by power line.
Be illustrated in figure 6 as the internal structure schematic diagram of the remote termination of the utility model embodiment.Remote termination B also comprises monitoring unit, and this monitoring unit is connected with low noise amplifier with described TDD transmitting-receiving lock unit, power amplifier, is used for this remote termination B is carried out overall monitor; Also comprise power subsystem and connected mains switch, described mains switch is connected with monitoring unit with power amplifier, light Transmit-Receive Unit and wavelength division multiplexer with described TDD transmitting-receiving lock unit, low noise amplifier respectively by power line.
In the present embodiment, described mains switch is that sky is opened the unit; Power subsystem is converted to DC power supply with the external communication electricity, gives each part power supply of described near-end machine A and remote termination B.
In the present embodiment, the filter BPF of near-end machine A and remote termination B is used for filtering radio frequency out of band signal, and its radio frequency (RF) input, output port adopt 50 Ω, SMA-50K joint;
TDD transmitting-receiving lock unit adopts high-speed synchronous switch (SPDT), is used to realize the transmission duplex of signal, and its RF input, output port are 50 Ω, SMA-50K joint;
Monitoring unit is used for the comprehensive monitoring to direct amplification machine, comprising: AC and DC Power Supply Monitoring, gate inhibition's monitoring, gain-adjusted, gain supervision, power-monitoring, power adjustments, overpower alarm, excess temperature alarm, channel setting, fan monitoring etc.; Its control interface is: DB-15J; DB-9J; Connecting line is a winding displacement; RS-232 is controlled mouth;
Light Transmit-Receive Unit and wavelength division multiplexer carry out radiofrequency signal to utilize optical fiber to transmit after the light modulation, wavelength division multiplexing single fiber transmission in the present embodiment, but also can adopt two fine transmission; Its RF input, output port are 50 Ω, SMA-50K joint; The DB-9J control interface, each pinout is as follows: Pin1:NC → sky; Pin2:GND → ground; Pin3:+12V → power supply; Pin4:NC → sky; Pin5:NC → sky; Pin6:LD MONITOR → Laser emission power-monitoring; Pin7:LD ALARM → Laser emission power alarm; Pin8:PD MONITOR → laser pick-off power-monitoring; Pin9:PD ALARM → laser pick-off power alarm;
The up low noise amplifier LNA of remote termination B is used for the low noise enlarging function of radiofrequency signal, and its RF input, output port are: 50 Ω, SMA-50K joint;
Downlink power amplifier PA on the remote termination B is used for the high-power amplification of signal, and gain 1dB stepping is adjustable, adjustable range 〉=30dB, stepping error≤1dB; Its RF input, output port are: 50 Ω, SMA-50K joint; The DB-15K control interface, pinout is as follows:
Pin1:ATT1 1dB when unsettled (undamped, decay during ground connection); Pin2:ATT2 2dB when unsettled (undamped, decay during ground connection); Pin3:ATT4 4dB when unsettled (undamped, decay during ground connection); Pin4:ATT8 8dB when unsettled (undamped, decay during ground connection); Pin5:ATT16 16dB when unsettled (undamped, decay during ground connection); The control of Pin6:AL automatic electric-level (control voltage 0～5V, control voltage, during+3V, power amplifier output nominal power); Pin7:+5V is inner to be used, will not be external; The empty pin of Pin8:NC; Pin9:O/T overtemperature degree alarm (alarm of TTL high level); Pin10:P/M power output indication (when the power amplifier nominal power is exported, being 3.5V); The Pin11:ENA high-power switchgear enables (high level+5V closes power amplifier, and unsettled or low level is opened power amplifier); Pin12:O/P overpower alarm (alarm of TTL high level); Pin13:VSWR standing-wave ratio alarm (alarm of TTL high level); The indication of Pin14:T/M assembly temperature (0.053V/ ℃, 4.505V@85 ℃, below 0V@0 ℃); Pin15:GND ground connection is decayed during low level.
The technical indicator of the direct amplification machine in the present embodiment is as shown in table 1.
Table 1
| Project | Index | ||
| 1 | Working frequency range | 1785～1805MHz | |
| 2 | Mode of operation | TDD | |
| 3 | Passage emission transient response and channel time delay | ＜3uS | |
| 4 | Down link | Minimum incoming level | -5dBm |
| 5 | Maximum gain | ＞40dB | |
| 6 | Gain adjustment range | ＞40dB | |
| 7 | Step-length is adjusted in gain | 1dB | |
| 8 | Peak power output | 0.5W, 1W, 2W is optional | |
| 9 | Passband fluctuation | ＜1.5dBp-p | |
| 10 | The adjacent-channel power spurious emissions | ＜-30dBm@±1000KHz Offset ＜-40dBm@±1500KHz Offset | |
| 11 | |||
| 12 | The double-tone intermodulation suppresses | The output of＜-40dBc@ nominal maximum power | |
| 13 | Band is outer to be suppressed | ＞45dBc@ departs from each 15 MHz＞60dBc@ of working band left and right sides sideband and departs from each 50 MHz of working band left and right sides sideband | |
| 14 | The far-end stray radiation | ＜-36dBm | |
| 15 | Up link | Noise factor | ＜5dB |
| 16 | Maximum gain | ＞50dB | |
| 17 | Gain adjustment range | ＞50dB | |
| 18 | Step-length is adjusted in gain | 1dB | |
| 19 | Passband fluctuation | ＜1.5dBp-p | |
| 20 | Maximum input level | -30dBm | |
| 21 | Radio frequency input/outbound port standing-wave ratio | ＜1.5 | |
| 22 | The radio frequency interface type | N-F | |
| 23 | The optical fiber interface type | FC/APC, single mode | |
| 24 | Operating voltage and power consumption | AC220V/0.5A max. | |
| 25 | Operating temperature range | 0～+50℃ | |
| 26 | Operating humidity range | 0～90% no water-setting | |
Wherein, light emitting power: 〉=0dBm; Optical wavelength: 1310nm/1550nm; Light path attenuation: 10dB (being equivalent to 20 kilometers of theoretical transmission ranges); Maximum light receiving power must not be greater than 0dBm; The power output of forward direction (descending) link is determined as required.
Shown in Fig. 5,6, on described near-end machine A and remote termination B, also be provided with interfaces such as optical signal interface, power interface, radiofrequency signal interface.
Shown in Fig. 7 A to 7C, be front view, vertical view and the end view of the profile of near-end machine of the present utility model.Wherein,
The optical fiber connector, promptly optical fiber emission port TX and optical fiber receiving port RX are optical signal interface, are connected with corresponding optical fiber, inner and described smooth Transmit-Receive Unit is connected with wavelength division multiplexer;
Mains switch is opened the unit with described sky and is connected;
AC Power supply socket is used to connect external 220V AC power; Serial ports is promptly monitored mouth, and inside is connected external PC, laptop computer or other portable terminal device with monitoring unit;
The BS port is radio frequency interface, is connected with the coupler of SCDMA base station, the inner filter that connects.
Shown in Fig. 8 A to 8D, for profile front view, vertical view, the end view of the utility model remote termination with install and fix the foot rest schematic diagram.Wherein,
The optical fiber connector, promptly optical fiber emission port TX and optical fiber receiving port RX are optical signal interface, are connected with corresponding optical fiber, inner and described smooth Transmit-Receive Unit is connected with wavelength division multiplexer;
AC Power supply socket is used to connect external 220V AC power, as the power supply unit of this remote termination B;
Serial ports is promptly monitored mouth, and inside is connected external PC, laptop computer or other portable terminal device with monitoring unit;
User side MS port is radio frequency interface, is connected with retransmitting antenna, the inner filter that connects;
The mains switch of remote termination B is in remote termination B casing, and is not shown.
In the present embodiment, the size of near-end machine A and remote termination B is: 240 * 420 * 680mm, device housings all adopt the military products cast aluminium to constitute.Wherein,
Serial ports: the local monitor debug port, be used for being connected direct amplification machine is debugged and monitored with the PC serial ports, the use of monitoring function can be consulted " optical fiber direct amplification machine supervisory control system user's manual ";
Radio frequency interface: prevention at radio-frequency port MS connects retransmitting antenna, links to each other with the input port of the filter of remote termination B; The BS port connects the base station end, links to each other with the input port of the filter of near-end machine A, all adopts 50 Ω, N-50K joint; RS-232 control mouth is DB-9K;
The optical fiber connector: TX is the optical fiber emission port, and RX is the optical fiber receiving port, is connected with wavelength division multiplexer with the light Transmit-Receive Unit, is the light joint categories of 1.31nm/1.55nm FC/PC;
Fixing foot rest: be used for fixing direct amplification machine on wall is warded off or on the foot rest.
In the present embodiment, location, site, repeater:
The long transmission distance of optical fiber repeater, the distance of near-end machine A and remote termination B can reach 10 kilometers, does not have the receive-transmit isolation problem, has avoided co-channel interference, thereby addressing is convenient, and can use omnidirectional antenna, realizes that omnidirectional covers; And signal transmission is not subjected to the restriction of geographical conditions, easily builds a station; The near-end machine A of base station coupling can directly be installed in the base station, and the site of remote termination B is selected the higher point in geographical position as far as possible, does not have obstacle on every side; The zone that the repeater can cover preferably is selected in outside the blind area, and near the edge, blind area, otherwise repeater and base station form overlapping covering, and mobile station signal is leaded up to time-delay back, repeater and arrived the base station, and one the tunnel directly arrives the base station, will form the multipath interference to the base station.So, reduce the region area of the overlapping covering in repeater and base station as far as possible, minimum as far as possible to guarantee to the interference of SCDMA system.
Adopt the coupler of 10dB to 30dB in the present embodiment.
During installation, connect BS port (the near-end machine a-signal input port of a cable from the coupling port of coupler to near-end machine A, the inner filter that connects), nearly the light emission port of terminal A and light-receiving port are connected respectively on the corresponding optical cable, and near-end machine A can be fixed on the wall or be fixed on the platform; Remote termination B is installed, the antenna feeder joint is connected to MS port (remote termination B signal output, the inner filter that connects of direct amplification machine, the outside antenna that connects), and optical cable is connected to emission of corresponding light and light-receiving port, remote termination B can be fixed on the wall, also can be fixed on the pole.
During use, connect near-end machine A and remote termination B-source, laptop computer and direct amplification machine local monitor interface are connected, and start monitoring software.Use monitoring software to monitor down output power, regulate the direct amplification machine gain and make it reach designing requirement, regulate uplink gain simultaneously, make it reach balance.Because the remolding sensitivity travelling carriage height of base station, uplink gain can help optimizing the introducing noise of SCDMA direct amplification machine suitably than the low 3～5dB of descending gain.
In the utility model, remote termination also can be for a plurality of, as shown in Figure 9, when remote termination is 3, the fundamental diagram of SCDMA optical fiber repeater, similar when its operation principle and remote termination are 1, repeat no more herein.
The foregoing description only is used to illustrate the utility model, but not is used to limit the utility model.
Claims (13)
1. SCDMA optical fiber repeater, it is characterized in that, comprising: SCDMA BTS under CROS environment BTS, the coupler that is connected with this BTS under CROS environment BTS, the local feeder line that is connected with this coupler and near-end machine, at least one remote termination that is connected with the far-end retransmitting antenna and the optical fiber that connects described near-end machine and remote termination; Wherein,
Described near-end machine receives the downstream signal of SCDMA BTS under CROS environment BTS through coupler, through electric light conversion back by described Optical Fiber Transmission to remote termination, in described remote termination, carry out opto-electronic conversion and power amplification after, launch by retransmitting antenna;
After the upward signal that described remote termination receives described retransmitting antenna carries out that low noise amplifier amplifies and electric light changes, to the near-end machine, be sent to SCDMA BTS under CROS environment BTS after in this near-end machine, carrying out opto-electronic conversion through described Optical Fiber Transmission.
2. SCDMA optical fiber repeater according to claim 1, it is characterized in that described near-end machine comprises: filter, the TDD transmitting-receiving lock unit that is connected with this filter, light Transmit-Receive Unit and the wavelength division multiplexer receiving and dispatching up pushing unit that lock unit is connected and descending pushing unit, be connected with described TDD with described up, descending pushing unit; Wherein,
The downlink radio-frequency signal that described SCDMA BTS under CROS environment BTS sends inputs to described filter through coupler, filtering radio frequency out of band signal in this filter; Filtered signal is inputed to descending pushing unit through described TDD transmitting-receiving lock unit, send into described smooth Transmit-Receive Unit and wavelength division multiplexer again and carry out the electric light conversion, then, the light signal after the conversion is transported to described remote termination through optical fiber;
The light Transmit-Receive Unit of described near-end machine and wavelength division multiplexer receive the light signal of described remote termination simultaneously, and carry out opto-electronic conversion, export the signal of telecommunication after the conversion to SCDMA BTS under CROS environment BTS through described up pushing unit, TDD transmitting-receiving lock unit, filter.
3. SCDMA optical fiber repeater according to claim 2 is characterized in that, described near-end machine also comprises monitoring unit, this monitoring unit and described TDD transmitting-receiving lock unit with descending, pushing unit is connected up and down, be used for the near-end machine is carried out overall monitor.
4. SCDMA optical fiber repeater according to claim 1 is characterized in that, described remote termination comprises: light Transmit-Receive Unit and wavelength division multiplexer, power amplifier, low noise amplifier, TDD transmitting-receiving lock unit and filter; Wherein,
Described smooth Transmit-Receive Unit and wavelength division multiplexer receive the downlink optical signal of optical fiber transmission and carry out opto-electronic conversion, the signal of telecommunication after the conversion is become required power level signal through described power amplifier, and, launch by described retransmitting antenna by described TDD transmitting-receiving lock unit and filter;
Described retransmitting antenna receives upward signal, sends into described filter, filtering radio frequency out of band signal in this filter; Filtered signal is sent into described low noise amplifier through described TDD transmitting-receiving lock unit, be amplified to certain level signal, then this signal is sent into described smooth Transmit-Receive Unit and wavelength division multiplexer and carried out the electric light conversion, the light signal after the conversion is transported to described near-end machine through optical fiber.
5. SCDMA optical fiber repeater according to claim 4 is characterized in that described remote termination also comprises monitoring unit, and this monitoring unit is connected with low noise amplifier with described TDD transmitting-receiving lock unit, power amplifier, and this remote termination is carried out overall monitor.
6. a SCDMA optical fiber direct amplification machine is characterized in that, comprising: near-end machine, at least one remote termination that is connected with the far-end retransmitting antenna and the optical fiber that connects described near-end machine and remote termination; Wherein,
Described near-end machine receives the downstream signal of SCDMA BTS under CROS environment BTS through coupler, carry out electric light conversion back by described Optical Fiber Transmission to remote termination, in described remote termination, carry out opto-electronic conversion and power amplification after, launch by retransmitting antenna;
After the upward signal that described remote termination receives described retransmitting antenna carries out that low noise amplifier amplifies and electric light changes, to the near-end machine, be sent to SCDMA BTS under CROS environment BTS after in this near-end machine, carrying out opto-electronic conversion through described Optical Fiber Transmission.
7. SCDMA optical fiber direct amplification machine according to claim 6, it is characterized in that described near-end machine comprises: filter, the TDD transmitting-receiving lock unit that is connected with this filter, light Transmit-Receive Unit and the wavelength division multiplexer receiving and dispatching up pushing unit that lock unit is connected and descending pushing unit, be connected with described TDD with described up, descending pushing unit; Wherein,
The downlink radio-frequency signal that described SCDMA BTS under CROS environment BTS sends inputs to described filter through coupler, filtering radio frequency out of band signal in this filter; Filtered signal is inputed to descending pushing unit through described TDD transmitting-receiving lock unit, send into described smooth Transmit-Receive Unit and wavelength division multiplexer again and carry out the electric light conversion, then, the light signal after the conversion is transported to described remote termination through optical fiber;
The light Transmit-Receive Unit of described near-end machine and wavelength division multiplexer receive the light signal of described remote termination simultaneously, and carry out opto-electronic conversion, export the signal of telecommunication after the conversion to SCDMA BTS under CROS environment BTS through described up pushing unit, TDD transmitting-receiving lock unit, filter.
8. SCDMA optical fiber direct amplification machine according to claim 7 is characterized in that, described near-end machine also comprises monitoring unit, this monitoring unit and described TDD transmitting-receiving lock unit with descending, pushing unit is connected up and down, be used for this near-end machine is carried out overall monitor.
9. SCDMA optical fiber direct amplification machine according to claim 6 is characterized in that, described remote termination comprises: light Transmit-Receive Unit and wavelength division multiplexer, power amplifier, low noise amplifier, TDD transmitting-receiving lock unit and filter; Wherein,
Described smooth Transmit-Receive Unit and wavelength division multiplexer receive the downlink optical signal of optical fiber transmission and carry out opto-electronic conversion, the signal of telecommunication after the conversion is become required power level signal through described power amplifier, and, launch by described retransmitting antenna by described TDD transmitting-receiving lock unit and filter;
Described retransmitting antenna receives upward signal, sends into described filter, filtering radio frequency out of band signal in this filter; Filtered signal is sent into described low noise amplifier through described TDD transmitting-receiving lock unit, be amplified to certain level signal, then this signal is sent into described smooth Transmit-Receive Unit and wavelength division multiplexer and carried out the electric light conversion, the light signal after the conversion is transported to described near-end machine through optical fiber.
10. SCDMA optical fiber direct amplification machine according to claim 9, it is characterized in that, described remote termination also comprises monitoring unit, and this monitoring unit is connected with low noise amplifier with described TDD transmitting-receiving lock unit, power amplifier, is used for this remote termination is carried out overall monitor.
11. SCDMA optical fiber direct amplification machine according to claim 6 is characterized in that, the working frequency range of this SCDMA optical fiber direct amplification machine is 1785～1805MHz.
12., it is characterized in that described smooth Transmit-Receive Unit and wavelength division multiplexer adopt single fiber transmission or two fine transmission according to claim 7 or 9 described SCDMA optical fiber direct amplification machines.
13. according to Claim 8 or 10 described SCDMA optical fiber direct amplification machines, it is characterized in that described near-end machine includes power subsystem and the mains switch that is connected with this power subsystem with remote termination; Wherein,
Described power subsystem is used for the alternating current of external world's input is converted to direct current;
In the near-end machine, described mains switch is connected with monitoring unit with descending pushing unit, light Transmit-Receive Unit and wavelength division multiplexer with described TDD transmitting-receiving lock unit, up pushing unit respectively by power line;
In remote termination, described mains switch is connected with monitoring unit with power amplifier, light Transmit-Receive Unit and wavelength division multiplexer with described TDD transmitting-receiving lock unit, low noise amplifier respectively by power line.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2005201428253U CN2867728Y (en) | 2005-12-07 | 2005-12-07 | SCDMA fiber-optical high-frequency-amplification station |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2005201428253U CN2867728Y (en) | 2005-12-07 | 2005-12-07 | SCDMA fiber-optical high-frequency-amplification station |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101170838B (en) * | 2007-09-28 | 2010-09-15 | 武汉虹信通信技术有限责任公司 | Radio carrier resource configuration system based on optical switching |
| CN106953677A (en) * | 2017-03-17 | 2017-07-14 | 宁波德泰信息科技有限公司 | A kind of repeater |
| CN112533282A (en) * | 2020-10-22 | 2021-03-19 | 中国电信股份有限公司 | Frequency synchronization method and system, near-end machine, far-end machine and storage medium |
-
2005
- 2005-12-07 CN CNU2005201428253U patent/CN2867728Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101170838B (en) * | 2007-09-28 | 2010-09-15 | 武汉虹信通信技术有限责任公司 | Radio carrier resource configuration system based on optical switching |
| CN106953677A (en) * | 2017-03-17 | 2017-07-14 | 宁波德泰信息科技有限公司 | A kind of repeater |
| CN106953677B (en) * | 2017-03-17 | 2020-08-11 | 宁波德泰信息科技有限公司 | Repeater station |
| CN112533282A (en) * | 2020-10-22 | 2021-03-19 | 中国电信股份有限公司 | Frequency synchronization method and system, near-end machine, far-end machine and storage medium |
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