CN201188676Y - Digitization remote recovering instrument for RF signal - Google Patents
Digitization remote recovering instrument for RF signal Download PDFInfo
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- CN201188676Y CN201188676Y CNU2008200285078U CN200820028507U CN201188676Y CN 201188676 Y CN201188676 Y CN 201188676Y CN U2008200285078 U CNU2008200285078 U CN U2008200285078U CN 200820028507 U CN200820028507 U CN 200820028507U CN 201188676 Y CN201188676 Y CN 201188676Y
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Abstract
The utility model discloses an RF signal digital remote recovery instrument comprising a center processing unit which is respectively connected with a down frequency-descending unit, an up frequency-ascending unit, an RF signal transmitting-receiving unit and a high-speed serial transmission unit; the center processing unit is composed of a CPU controller and an indicating unit connected with the CPU controller; the down frequency-descending unit is composed of a high-speed analog/digital converting unit, a direct digital frequency-descending processing chip and a serial and parallel converting unit, all of which are connected with each other in sequence; the up frequency-ascending unit is composed of a high-speed digital/analog converting unit, a digital frequency-ascending unit and a high-speed serial and parallel converting unit, all of which are connected with each other in sequence; the RF signal transmitting-receiving unit is composed of a high gain antenna and an RF bilateral power amplifier. The recovery instrument of the utility model is not interfered by the outside electromagnet and the transmission distance as well as the number of calling persons, has high signal to noise ratio and public agreement, ensures the calling quality and lowers the power consumption.
Description
Technical field
The utility model belongs to wireless communication technology field, relates to a kind of communicator, is specifically related to the signal digitalized remote recovery instrument of a kind of RF.
Background technology
At present, realize the long-range traditional analog radio frequency technology that mostly adopts that covers again of wireless signal.This technology is used traditional analog wireless signals power amplifier, simulation LNA, simulated light terminal, and analogue device such as optical branching device, and power is big, needs the configuration fin that volume is big, cost is high.Cause the overall cost of equipment high, be unfavorable for the microminiaturization of equipment.Even be equipped with fin, the temperature in the equipment is still very high, and the analogue device in the equipment is made a big impact, and equipment integral RF parameter is changed, and influences communication quality.Simultaneously, the temperature height can make the electronic device accelerated ageing, reduces the useful life of equipment.Adopt radiator fan can reduce temperature in the cabinet, but fan is out of order easily, makes reduce the continuous non-failure operation time of system, also be unfavorable for " three is anti-" of equipment.
Along with the high speed development of mobile communication and user to the improving constantly of mobile communication quality requirement, obtained large-scale application based on the repeater communication system of simulated light terminal.The covering system function is stronger again based on the RF signal of simulated light terminal.But have following problem: be subjected to outside electromagnetic interference easily, speech quality is not high; Long transmission distance or conversation number for a long time, noiseproof feature is good inadequately, power consumption is very high, influence the normal operation of FSK in the simulated light terminal.This just provides stage for covering communication system again based on totally digitilized RF signal remote recovery.
Summary of the invention
The purpose of this utility model provides the signal digitalized remote recovery instrument of a kind of RF, is not subjected to what the influence of outside electromagnetic interference and long-distance transmissions and conversation number, even there is heavy interference source, also can the normal transmission data, guarantee speech quality, the signal to noise ratio height, protocol transparent reduces power consumption.
The technical scheme that the utility model adopted is, the signal digitalized remote recovery instrument of RF, comprise CPU, CPU respectively with descending frequency reducing unit, up raising frequency unit, RF signal transmitting and receiving unit is connected with the high speed serial transmission unit, CPU, constitute by cpu controller and the indicating member that is attached thereto, descending frequency reducing unit is by the high speed analog/digital conversion unit that links to each other successively, Direct Digital down conversion process chip and string and converting unit constitute, up raising frequency unit is by the high-speed figure/analog-converted unit that links to each other successively, the raising frequency unit and the also converting unit composition of going here and there at a high speed on the numeral, RF signal transmitting and receiving unit is made up of high-gain aerial and RF bidirectional power amplifier.
Feature of the present utility model also is,
Cpu controller is gone up the raising frequency unit with high speed analog/digital conversion unit, Direct Digital down conversion process chip, string and converting unit, high-speed figure/analog-converted unit, numeral respectively, and converting unit is connected with going here and there also at a high speed.
RF bidirectional power amplifier is connected with high-speed figure/analog-converted unit with high speed analog/digital conversion unit respectively.
The high speed serial transmission unit is connected with high speed string and converting unit with string and converting unit respectively.
The beneficial effects of the utility model are:
1. advanced: with the radiofrequency signal digitlization, utilize high-speed serial communication to transmit, realizes real-time radiofrequency signal far-end recovery, analog signal transmission has as compared with the past improved the antijamming capability of signal greatly.
2. saving: in the covering system of repeater, make full use of the optical cable between original repeater main website and the slave station, need not extra wiring, just original analogue system can be upgraded to digital system, avoided transformation, greatly reduce construction volume to original circuit.
3. reliability: the signal digitalized remote recovery instrument of capital equipment RF adopts embedded real-time operating system, and equipment is comparatively simple, and all data all pass through Optical Fiber Transmission, and signal to noise ratio improves greatly, and the error rate is extremely low, and the ability of anti-electromagnetic interference is improve greatly also.
4. the ratio of performance to price: the utility model has adopted totally digitilized technology, and intrasystem analogue device and power-type device reduce, and the volume of cabinet and fin reduces thereupon, thereby has reduced the shell cost; Simultaneously, replaced a plurality of power models in the analogue system, reduced the cost of core processing part with the chip of high integration; Do not change the laying of original optical fiber, former simulation system is transformed, reduced improvement cost; Replace optical fiber with twisted-pair feeder during short haul connection, reduced the comprehensive wiring cost.
5. fail safe: the radiofrequency signal of being transmitted be need not decoding, do not need to know the particular content of code element, also need not to know to be which kind of signal, transmit after the radiofrequency signal digitlization with the inlet side, revert to the radiofrequency signal of inlet side at far-end, do not relate to the problem that Content of communciation is divulged a secret, safe.
6. use and maintainability: the installation of system is fairly simple, and the reliability of capital equipment is very high, and maintainability is fine, and can realize the remote upgrade and the remote maintenance of system by additional remote communication module.
7. expansion and extensibility: signal demand expands to a plurality of whens area, can increase cover serial number leaflet unit along separate routes at a high speed, realizes that the signal of multiple spot covers.
8. speed is fast: in the long system apart from low capacity, use the twisted-pair feeder transmission signals, transmission speed is 100Mbps.In the system of short distance high power capacity, adopt optical fiber transmission signal, transmission speed can reach 3.64Gbps.
9. good stability: successfully solved difficult problems such as signal attenuation, electromagnetic interference, transmission range be relatively short, communication distance is 10 kilometers.
10. antijamming capability is strong: adopt optical fiber in the system of electromagnetic environment complexity, long transmission distance, reduced outside electromagnetic interference to transmitting the influence of signal, even if also can the normal transmission data under the situation that heavy interference source exists.
11. applied range: the signal that the utility model not only can be used for mobile communication covers again, and the signal that can also be used for the individual radio network covers again, the fields such as long-range covering of short-distance wireless communication.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of the utility model remote recovery instrument.
Among the figure, 1.RF signal transmitting and receiving unit, 2. descending frequency reducing unit, 3. up raising frequency unit, 4. CPU, 5. high speed serial transmission unit.
Wherein, 1-1. high-gain aerial, 1-2.RF the bidirectional power amplifier, 2-1. high speed analog/digital conversion unit, 2-2. Direct Digital down conversion process chip, 2-3. string and converting unit, 3-1. high-speed figure/analog-converted unit, raising frequency unit on the 3-2. numeral, 3-3. goes here and there at a high speed and converting unit, 4-1.CPU controller, the 4-2. indicating member.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
The structure of a kind of embodiment of the present utility model, as shown in Figure 1.
Remote recovery instrument of the present utility model, comprise CPU 1, CPU 1 is connected with up raising frequency unit 3 with descending frequency reducing unit 2, descending frequency reducing unit 2 is connected with high speed serial transmission unit 5 with RF signal transmitting and receiving unit 1 respectively, and up raising frequency unit 3 is connected with high speed serial transmission unit 5 with RF signal transmitting and receiving unit 1 respectively.
RF signal transmitting and receiving unit 1 is by high-gain aerial 1-1 and be attached thereto the RF bidirectional power amplifier 1-2 that connects and constitute.
CPU 4 is made of cpu controller 4-1 and the indicating member 4-2 that is attached thereto.
Descending frequency reducing unit 2 is made up of the high speed analog/digital conversion unit 2-1, the Direct Digital down conversion process chip 2-2 that connect successively and string and converting unit 2-3.High speed analog-to-digital converting module 2-1 is connected with cpu controller 4-1 with RF bidirectional power amplifier 1-2 respectively.Direct Digital down conversion process chip 2-2 is connected with cpu controller 4-1.String and converting unit 2-3 are connected with high speed serial transmission unit 5 with cpu controller 4-1 respectively.
Up raising frequency unit 3 is by raising frequency unit 3-2 on the digital high-speed digital/analog converter 3-1 that connects successively, the numeral and high speed is gone here and there and converting unit 3-3 forms, and high-speed figure/analog-converted unit 3-1 is connected with cpu controller 4-1 with RF bidirectional power amplifier 1-2 respectively.Raising frequency unit 3-2 is connected with cpu controller 4-1 on the numeral.String and converting unit 3-3 are connected with high speed serial transmission unit 5 with cpu controller 4-1 respectively at a high speed.
High-gain aerial 1-1 is as the passage of system with aerial RF signal communication.Common antenna for base station mainly divides two kinds of outdoor antenna for base station and indoor distribution antennas in the existing mobile communications system.The outdoor base station antenna mainly contains mechanical omnidirectional antenna, prefabricated electrical down-tilting omnidirectional antenna, the directed mechanical antenna of single polarization, the directed mechanical antenna of dual polarization, the directed prefabricated electrical down-tilting antenna of dual polarization and the directed electrical tilt antenna of dual polarization; Indoor distribution antenna mainly contains ceiling mount antenna, wall aerial, Yagi antenna etc.
RF bidirectional power amplifier 1-2 is made of power amplifier and duplexer.Duplexer also claims antenna multicoupler, is " the only way which must be passed " of wireless signal transmission and reception.The high-frequency signal that its effect will be launched exactly is transported to high-gain aerial 1-1, and launches, and simultaneously, the high-frequency signal that high-gain aerial 1-1 is received is sent to height and puts receiving loop.Duplexer has polytype, and duplexer commonly used in the wireless telecommunications is the directional couple duplexer, is made up of connection feedback pipe and an absorption resistance that two Riblet couplers, two band pass filters, electrical lengths equate.Riblet coupler all will be debugged separately before system is connected with filter.Should note following problem in the debug process:
(1) the Riblet coupler inner wire corner angle slyness of must polishing prevents the burr sparking, burns out inner wire.
(2) holding screw can not become flexible, and must add spring washer.Otherwise, can cause reflection loss, especially insert loss objective and descend.
(3) each plug must cooperate closely, and connecting feedback pipe electrical length must equate.
(4) the insertion loss is excessive, can cause the housing heating, and when the insertion loss was 1dB, case temperature can reach 50 ℃.Therefore, the insertion loss is the smaller the better.
(5) processing technology is the key factor that influences the duplexer index, therefore, must maintain strict control over the technology pass in the design and the course of processing.
The utility model adopts the directional couple duplexer.
High speed analog/digital conversion unit 2-1, use is owed Sampling techniques and directly the RF signal is sampled.ADC commonly used has four kinds: flash-type, successive approximation, pipeline-type and ∑ △ type.Flash-type can convert the analogue value to digital value in 1 clock cycle.Successive approximation mainly is with identical transducer comparative level repeatedly, carries out and handles.Flash-type and successive approximation all do not have operational amplifier.Though circuit structure is fairly simple, precision be improved and just number of comparisons must be increased, be difficult to realize high speed operation.Pipelined ad C has multistage low precision A/D change-over circuit, with 1～1.5 precision everybody value is judged, can carry out a plurality of processing in a clock cycle, has taken into account on performance at a high speed and high-precision requirement.∑ △ type ADC is made of integrator, quantizer and DAC.This type is in the over-sampling mode, and the frequency during sampling is far longer than nyquist frequency, to reduce the noise level in the signal band.When the over-sampling ratio was brought up to 2 times, signal to noise ratio can be improved 3dB.In ∑ △ type, input signal is carried out carrying out integration behind the over-sampling, and after quantizing, carry out differential.Carry out differential after integration, input signal will restore to the original state.Adopt pipelined ad C or ∑ △ type in the utility model.
Direct Digital down conversion process chip 2-2 is the critical component of down going channel, the realization of down-conversion has dual mode: a kind of down-conversion that is analogue device to analog signal, promptly Shu Ru signal is an analog radio-frequency signal, and what export after inter-process also is analog radio-frequency signal.Another kind is the down-conversion of digital device to digital signal, and digital device can be special process chip, can be general-purpose chip also, realizes by software programming as devices such as DSP or VHDL.The frequency reducing method of using in the process of down-conversion is determining the performance of down-conversion.Digital down-conversion technology can be according to the difference of signal characteristic, and reprogramming adapts to different signals.
String and converting unit 2-3 become serial signal with the LVDS device with parallel digital signal transition by the CPLD device.The transmission speed of LVDS chip is very high, has reached 3.64Gbps.This element is a defined physical layer data interface standard in TIA/EIA-644 and IEEE 1596.3 standards, and it is designed to be primarily aimed at high speed, low power consumption and the application of low noise point-to-point communication, is to move under 100 Ω in balance and transmission medium impedance Control usually.The same with other differential signal technical standard, LVDS has eliminated electromagnetic field, than the lower noise of monofocal signal emission, in addition, noise can be coupled on two lines becomes common-mode signal, and promptly the noise that is absorbed on two transmission lines is identical, therefore, noise resisting ability is higher.Adopt the voltage mode driver relatively, can reduce source and earthing pop-corn and eliminate to penetrate and wear electric current, lower voltage amplitude also allows LVDS can reach data transmission rate with the PECL ad eundem simultaneously, but power consumption has only 1/10.
String and converting unit 3-3 are used for converting serial signal to parallel signal at a high speed.Help to realize more effective, more economical design.Promptly use less printed circuit board (PCB) lines and connector and cable count, take less circuit board space, in the simplified system design, reduced the overall system cost.The high speed string that the utility model adopts and the ability of conversion are no less than 1000Mbps.
Raising frequency unit 3-2 on the numeral is used to handle from going here and there the also baseband sample value sequence of converting unit 3-3 at a high speed, and its up-conversion is faded to intermediate frequency, connects load or continues to deliver to the next stage up-converter circuit through amplifying circuit then.This is that the centre frequency of the up-conversion of utility model need could be determined through actual debugging.
Digital signal after D/A converting unit among high-speed figure/analog-converted unit 3-1 will be modulated converts analog signal to.Because the zeroth order of DAC keeps effect, the frequency spectrum of its output signal is actually to be crossed by the SINC envelope card weighting.Therefore need add 1 anti-sinc filter in the DAC front, input traffic is carried out abnormal in advance, to proofread and correct the distortion that DAC causes.The conversion speed of high-speed figure/analog-converted unit that the utility model adopts is at least 210MPS.
Cpu controller 4-1 is the core component of whole system co-ordination, and operational factor that not only can dynamic debugging system can also monitor the running status of each workpiece, and by real-time the showing of indicating member 4-2.Cpu controller 4-1 is an individual components, and the passage that system is adjusted is provided, and by to the adjustment of software in the CPU and the adjustment of program intrinsic parameter, can carry out remote recovery and remote upgrade to unlike signal.Indicating member 4-2 can be indicated the state of system by the mode that the people can feel.
High speed serial transmission unit 5 reaches the suitable adapter of signal input of serial the compatibility of level and the correcting data error of hardware, and uses high-speed transfer medium commonly used to be transmitted.
Descending RF signal through RF bidirectional power amplifier 1-2 amplification, after entering high speed analog/digital conversion unit 2-1, obtain RF signals sampling signal by owing Sampling techniques, this sampled signal directly enters Direct Digital down conversion process chip 2-2, obtain parallel baseband signal after treatment, parallel baseband signal is handled through string and converting unit 2-3, obtains serial signal, and this serial signal is transferred to far-end by the down going channel of high speed serial transmission unit 5.
High speed string and converting unit 3-3 that the data feedback channel of the high-speed serial signals that far-end transmits through high speed serial transmission unit 5 is transferred in the up raising frequency unit 3 handle, obtain parallel baseband signal, the baseband signal that should walk abreast is after raising frequency unit 3-2 on the numeral handles, obtain digital radio signal, this digital radio signal is consistent with the sampled data of high speed analog/digital conversion unit 2-1, digital-to-analogue conversion through high-speed figure/analog-converted unit 3-1 obtains the RF signal.This RF signal is transferred to RF bidirectional power amplifier 1-2, and after RF bidirectional power alarm 1-2 amplifies, and is transferred to high-gain aerial 1-1 and is transmitted into and treats the overlay area.
Cpu controller 4-1 in the CPU 4 and high speed analog/digital conversion unit 2-1, Direct Digital down conversion process chip 2-2 are connected with string and converting unit 2-3, and converting unit 3-3 is connected with going here and there also at a high speed to go up raising frequency unit 3-2 with high-speed digital-analog converting unit 3-1, numeral.Monitor the ruuning situation of these six unit, and link to each other, the running status of system is shown by indicating member 4-2 with indicating member 4-2.
Claims (4)
1.RF signal digitalized remote recovery instrument, it is characterized in that, comprise CPU (4), CPU (4) respectively with descending frequency reducing unit (2), up raising frequency unit (3), RF signal transmitting and receiving unit (1) is connected with high speed serial transmission unit (5), described CPU (4), constitute by cpu controller (4-1) and the indicating member (4-2) that is attached thereto, described descending frequency reducing unit (2) is by the high speed analog/digital conversion unit (2-1) that links to each other successively, Direct Digital down conversion process chip (2-2) and string and converting unit (2-3) constitute, described up raising frequency unit (3) is by high-speed figure/analog-converted unit (3-1) that links to each other successively, raising frequency unit (3-2) and also converting unit (3-3) composition of going here and there at a high speed on the numeral, described RF signal transmitting and receiving unit (1) is made up of high-gain aerial (1-1) and RF bidirectional power amplifier.
2. the signal digitalized remote recovery instrument of RF according to claim 1, it is characterized in that described cpu controller (4-1) is gone up raising frequency unit (3-2) and high speed with high speed analog/digital conversion unit (2-1), Direct Digital down conversion process chip (2-2), string and converting unit (2-3), high-speed figure/analog-converted unit (3-1), numeral respectively and gone here and there also that converting unit (3-3) is connected.
3. the signal digitalized remote recovery instrument of RF according to claim 1 is characterized in that, described RF bidirectional power amplifier (1-2) is connected with high-speed figure/analog-converted unit (3-1) with high speed analog/digital conversion unit (2-1) respectively.
4. the signal digitalized remote recovery instrument of RF according to claim 1 is characterized in that, described high speed serial transmission unit (5) is connected with high speed string and converting unit (3-3) with string and converting unit (2-3) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200285078U CN201188676Y (en) | 2008-03-10 | 2008-03-10 | Digitization remote recovering instrument for RF signal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200285078U CN201188676Y (en) | 2008-03-10 | 2008-03-10 | Digitization remote recovering instrument for RF signal |
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| Publication Number | Publication Date |
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| CN201188676Y true CN201188676Y (en) | 2009-01-28 |
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| CNU2008200285078U Expired - Fee Related CN201188676Y (en) | 2008-03-10 | 2008-03-10 | Digitization remote recovering instrument for RF signal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375973A (en) * | 2015-09-29 | 2016-03-02 | 中国空间技术研究院 | A smart load system and a smart load implementation method based on radio frequency link coupling access |
| CN106330287A (en) * | 2016-09-05 | 2017-01-11 | 成都奥克特科技有限公司 | Store-and-forward working method for fiber optic repeater and store-and-forward fiber optic repeater |
-
2008
- 2008-03-10 CN CNU2008200285078U patent/CN201188676Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375973A (en) * | 2015-09-29 | 2016-03-02 | 中国空间技术研究院 | A smart load system and a smart load implementation method based on radio frequency link coupling access |
| CN105375973B (en) * | 2015-09-29 | 2018-10-09 | 中国空间技术研究院 | A kind of dexterous load system and implementation method based on radio frequency link coupling access |
| CN106330287A (en) * | 2016-09-05 | 2017-01-11 | 成都奥克特科技有限公司 | Store-and-forward working method for fiber optic repeater and store-and-forward fiber optic repeater |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090128 Termination date: 20140310 |