CN102625477A - 3G (third-generation) broadband digitalized super-remote wireless transmission system - Google Patents

3G (third-generation) broadband digitalized super-remote wireless transmission system Download PDF

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Publication number
CN102625477A
CN102625477A CN201210095636XA CN201210095636A CN102625477A CN 102625477 A CN102625477 A CN 102625477A CN 201210095636X A CN201210095636X A CN 201210095636XA CN 201210095636 A CN201210095636 A CN 201210095636A CN 102625477 A CN102625477 A CN 102625477A
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China
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duplexer
conversion module
frequency
passive filter
fpga
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CN201210095636XA
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肖飞
李彦芳
任晓红
刘海锋
崔浩雷
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HEBEI RENTIAN TELECOM TECHNOLOGY Co Ltd
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HEBEI RENTIAN TELECOM TECHNOLOGY Co Ltd
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Priority to CN201210095636XA priority Critical patent/CN102625477A/en
Publication of CN102625477A publication Critical patent/CN102625477A/en
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Abstract

The invention discloses a 3G (third-generation) broadband digitalized super-remote wireless transmission system, which comprises a near terminal, a remote terminal and a WCDMA (wideband code division multiple access) data card. The near terminal is communicated with the remote terminal through a relay antenna, the transmission frequency of the relay antenna adopts an intermediate frequency bandwidth, and the information transmission between the WCDMA data card and a service station is performed through a service antenna. Based on the WCDMA interface standard, the near terminal is installed on the existing base station, and the remote terminal is installed on a service tower in remote areas, so that the super-remote transmission of wireless communication is realized, the problem of 3G broadband access in the remote areas can be solved without cable laying, and the coverage rate of wireless network signals in hilly, mountainous and woodsy areas is increased.

Description

3G wideband digital very-long-range wireless transmitting system
Technical field
The present invention relates to wireless communication field, particularly a kind of communication system of the very-long-range wireless transmission based on 3G.
Background technology
The number of broadband customers in present remote mountain area is less, owing to link up difficulty with the external world, message is comparatively inaccessible, can not in time understand the practical work situation, propagates to information and has produced big obstacle.Trace it to its cause mainly is because the defective that operator exists aspect the deployment of broadband network; The access in broadband at present can only be introduced through cable and realize; This has just caused the high cost investment of operator at first stage of construction; And aspect the maintenance in later stage and Internet resources expansion difficulties comparatively all, the cost that for operator, drops into is higher than the usage charges in broadband far away.
3G is the abbreviation of 3G (Third Generation) Moblie technology, is meant the cellular mobile communication technology of supporting high speed data transfer, can transmit sound and data message simultaneously.At present domestic 3G communication network is supported three air interface standard that International Telecommunication Association confirms, is respectively the CDMA2000 of China Telecom, the WCDMA of CHINAUNICOM and the TD-SCDMA of China Mobile.CDMA uses sign indicating number to divide spread spectrum, and advanced power and voice activation can provide the network capacity greater than 3 times of GSM at least, and industry is with the mainstream technology of CDMA technology as 3G.The 3G GSM of telecommunications and mobile operator foundation at present is to adopt the base station to cooperate the mode of service antenna to carry out wireless signal to cover; Wherein all adopt high-frequency band to carry out message transmission between base station and each service antenna; Theoretical according to Fresnel: R=0.5 (λ D), wherein λ is a wavelength, D is an air line distance between two antennas; When two antenna air line distances fixedly the time, the Fresnel radius increases along with reducing of frequency.When adopting high-frequency transmission; The radius of Fresnel reduces naturally, causes the spatial transmission loss excessive, and diffracting power weakens; Therefore present wireless network transmissions only is confined to the covering in the visual range, can not satisfy the coverage rate in areas such as hills, mountain area and forest far away.Add the finiteness of communication frequency resource, operator must utilize limited frequency resource to go to guarantee the sustainable development of radio communication service.Therefore how to set up the wireless very-long-range transmission system of a kind of 3G, remote districts are inserted in the low-cost broadband of Rapid Realization becomes problem demanding prompt solution.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of 3G wideband digital very-long-range wireless transmitting system; Can carry out the very-long-range transmission; To improve the coverage rate of wireless network signal, solve the problem that remote districts are inserted in the low-cost broadband of Rapid Realization on hilliness, mountain area and backwoods.
For solving the problems of the technologies described above, the technical scheme that the present invention adopted is following.
3G wideband digital very-long-range wireless transmitting system; Comprise be arranged on be used on the base station with high-frequency signal change into intermediate-freuqncy signal the near-end machine, be arranged on and be used for WCDMA data card that intermediate-freuqncy signal is reduced to the remote termination of high-frequency signal and is arranged on user side on the service station; Through relaying antenna mutual communication, the transmission frequency of relaying antenna adopts intermediate-frequency bandwidth between said near-end machine and the remote termination; Carry out message transmission through service antenna between said WCDMA data card and the service station.
The concrete structure of said near-end machine is: said near-end machine comprise duplexer I, duplexer II and be arranged on the duplexer I and the duplexer II between radiofrequency signal processing module I; Through the cordless communication network mutual communication, the duplexer II is through mutual communication between relaying antenna and the remote termination between said duplexer I and base station; Said radiofrequency signal processing module I comprises controlled radio frequency attenuator, FPGA I, down conversion module I, low noise amplifier I and passive filter I, and the output of said duplexer I is connected with the input of duplexer II through controlled radio frequency attenuator, FPGA I, down conversion module I, passive filter I successively; The output of said duplexer II is connected with the input of duplexer I through passive filter I, low noise amplifier I, FPGA I, controlled radio frequency attenuator successively.
The concrete structure of said remote termination is: said remote termination comprises duplexer III, duplexer IV and is arranged on the radiofrequency signal processing module II between duplexer III, the duplexer IV; Through relaying antenna mutual communication, pass through the cordless communication network mutual communication between duplexer IV and the service station between said duplexer III and the near-end machine; Said radiofrequency signal processing module II comprises passive filter II, low noise amplifier II, FPGA II, up-conversion module and down conversion module II; The output of said duplexer III is connected with the duplexer IV through passive filter II, low noise amplifier II, FPGA II, up-conversion module successively, and the output of said duplexer IV is connected with the input of duplexer III through low noise amplifier II, FPGA II, down conversion module II, passive filter II successively.
Improvement of the present invention is: be provided with intermediate frequency mixer in said down conversion module I and the down conversion module II, said intermediate frequency mixer all adopts the frequency mixer that is used for the high-frequency signal of 1900 ~ 2200MHz is converted into the 230MHz intermediate-freuqncy signal.
Further improvement of the present invention is: said passive filter I and passive filter II all adopt digital filter.
Because the technological progress of having adopted technique scheme, the present invention to obtain is following.
The present invention is based on the WCDMA interface standard; Through the near-end machine is installed on present existing base station; On the service tower of remote districts, remote termination is installed; Realize the very-long-range transmission of radio communication, need not the 3G broadband access problem that cable laying can solve the remote mountain areas, improve the coverage rate of wireless network signal on hilliness, mountain area and backwoods.The WCDMA/GSM/DCS signal of communication that near-end machine of the present invention adopts enclave companding technology and digital microwave telecommunication technology will take big bandwidth carries out long-distance transmissions through the frequency band that the Digital IF Processing technology moves to about narrower 230MHz; After the relay transmission through overlength distance; Through the near-end machine intermediate-freuqncy signal of 230MHz is reduced into the WCDMA/GSM/DCS signal of 1900 ~ 2200MHz frequency range again, covers whole zone through service antenna at last.Therefore the present invention has the characteristic of good transmission and cut-through thing owing to adopted the intermediate-freuqncy signal about 230MHz to carry out relay transmission, has reduced the attenuation of space transmission, and transmission range and Fresnel diffraction radius are increased greatly.The relaying frequency configuration of relay transmission of the present invention can improve antijamming capability of the present invention and versatility for being the mode that step-length is adjusted with 50kHz.Passive filter adopts digital filter to have the outer inhibitory action of higher band, makes the present invention in use, effectively avoids the adjacent frequency resource of disturbing and reducing relay transmission frequently.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is explained further details.
A kind of 3G wideband digital very-long-range wireless transmitting system, as shown in Figure 1.Comprise near-end machine, remote termination and WCDMA data card, the near-end machine is installed on the base station, and remote termination is installed on the service station, and the WCDMA data card is installed in user side.Through relaying antenna mutual communication, the transmission frequency of relaying antenna is 230MHz between near-end machine and the remote termination, passes through the service antenna mutual communication between WCDMA data card and the service station.
1900 ~ 2200MHz high frequency WCDMA/GSM/DCS signal of base station becomes the intermediate-freuqncy signal of 230M frequency range after the near-end machine is handled; Intermediate-freuqncy signal through the relaying antenna transmission to the remote termination on the service station; After remote termination up-converts to 1900 ~ 2200MHz high frequency WCDMA/GSM/DCS signal with the intermediate-freuqncy signal of the 230M frequency range that receives; Send to the service station; High-frequency signal transmission is given the WCDMA data card of user side again through service antenna in the service station, can realize that just the 3G broadband wireless signal inserts, and supplies user's site information that surfs the web.
When the user need release news; The WCDMA data card sends to the service station with user's information releasing through service antenna, and the service station sends to remote termination with the signal that receives again, when remote termination receives 1900 ~ 2200MHz high frequency WCDMA/GSM/DCS signal of launching on the service station; It is down-converted to the intermediate-freuqncy signal of 230M frequency range; Again through the relaying antenna transmission to the near-end machine on the base station, the near-end machine is sent to the base station after intermediate-freuqncy signal being handled again.From then on just can realize the mutual communication between base station and user, the wireless network of accomplishing overlength distance covers.
Near-end machine of the present invention comprise duplexer I, duplexer II and be arranged on the duplexer I and the duplexer II between radiofrequency signal processing module I.Through the cordless communication network mutual communication, the duplexer II is through mutual communication between relaying antenna and the remote termination between duplexer I and base station.Wherein radiofrequency signal processing module I comprises controlled radio frequency attenuator, FPGA I, down conversion module I, low noise amplifier I and passive filter I.The passive filter I adopts digital filter, can guarantee that the near-end facility have the outer inhibit feature of higher band.Be provided with intermediate frequency mixer in the down conversion module I, intermediate frequency mixer is used for converting the high-frequency signal of 1900 ~ 2200MHz into the 230MHz intermediate-freuqncy signal.
The near-end machine signal downlink course of work: the output of duplexer I is connected with the input of duplexer II through controlled radio frequency attenuator, FPGA I, down conversion module I, passive filter I successively in the near-end machine.At first duplexer I 1900 ~ 2200MHz high frequency WCDMA/GSM/DCS signal that will receive from the base station is transferred to controlled radio frequency attenuator and decays; High-frequency signal after will decaying then passes to the FPGA I and carries out signal processing; High-frequency signal passes through operations such as digital channel filtering, time slot noise elimination, time delay processing in the FPGA I after; With analog-signal transitions is digital signal; And export to the down conversion module I; Intermediate frequency mixer in the down conversion module I converts the high-frequency signal of 900 ~ 2200MHz into the 230MHz intermediate-freuqncy signal, and intermediate-freuqncy signal is transferred to the passive filter I carries out Filtering Processing, carries out long-distance transmissions after filtered intermediate-freuqncy signal sends to the relaying antenna through the duplexer II.
The signal uplink course of work of near-end machine: the output of duplexer II is connected with the input of duplexer I through passive filter I, low noise amplifier I, FPGA I, controlled radio frequency attenuator successively in the near-end machine.At first the duplexer II is sent the intermediate-freuqncy signal that receives into the passive filter I and is carried out Filtering Processing; Carry out power amplification through the low noise amplifier I then; And be transferred to the FPGA I and carry out digital channel filtering, time slot noise elimination, time delay etc. and handle operation; Be to export to controlled radio frequency attenuator after the analog signal with digital signal transition simultaneously, controlled radio frequency attenuator is resent to the base station after with analog.
Remote termination of the present invention comprises duplexer III, duplexer IV and is arranged on the radiofrequency signal processing module II between duplexer III, the duplexer IV.Through relaying antenna mutual communication, pass through the cordless communication network mutual communication between duplexer IV and the service station between duplexer III and the near-end machine.Wherein radiofrequency signal processing module II comprises passive filter II, low noise amplifier II, FPGA II, up-conversion module and down conversion module II.The passive filter II adopts digital filter equally, can guarantee that remote termination has the outer inhibit feature of higher band.Be provided with intermediate frequency mixer in the down conversion module II equally, intermediate frequency mixer is used for converting the high-frequency signal of 1900 ~ 2200MHz into the 230MHz intermediate-freuqncy signal.Be provided with up-conversion mixer in the up-conversion module, be used for the 230MHz intermediate-freuqncy signal is converted into the high-frequency signal of 1900 ~ 2200MHz.
The remote termination signal downlink course of work is: the output of duplexer III is connected with the duplexer IV through passive filter II, low noise amplifier II, FPGA II, up-conversion module successively in the remote termination.At first the duplexer III is sent the intermediate-freuqncy signal that receives into the passive filter II and is carried out Filtering Processing; Carry out power amplification through the low noise amplifier II then; And be transferred to the FPGA II and carry out digital channel filtering, time slot noise elimination, time delay etc. and handle operation; Be to export to the up-conversion module after the analog signal with digital signal transition simultaneously; Up-conversion mixer in the up-conversion module converts the 230MHz intermediate-freuqncy signal high-frequency signal of 1900 ~ 2200MHz into, and is transferred to the service station, and the service antenna on the service station is transferred to the user with the high frequency wire size again.
The near-end machine signal uplink course of work is: the output of duplexer IV is connected with the input of duplexer III through low noise amplifier II, FPGA II, down conversion module II, passive filter II successively in the remote termination.At first duplexer IV 1900 ~ 2200MHz high frequency WCDMA/GSM/DCS signal that will receive from the service station is transferred to the low noise amplifier II and carries out signal processing; High-frequency signal after will handling then passes to the FPGA I and carries out digital channel filtering, time slot noise elimination, time delay processing; And just analog-signal transitions is a digital signal; And export to the down conversion module II; Intermediate frequency mixer in the down conversion module II converts the high-frequency signal of 900 ~ 2200MHz into the 230MHz intermediate-freuqncy signal, and intermediate-freuqncy signal sends to the relaying antenna through the duplexer III and carries out long-distance transmissions after the filtering of passive filter II.
Adopt the IF relay transmission means between near-end machine of the present invention and the remote termination; Make signal transmission distance farther; Not only can be widely used in comparatively smooth zones of physical features such as grassland, marine site, highway, railway be along the line; In the blind area or the weak area of coverage that can also be applied to can not look at straight in gully, hills and base station, 230M relaying electromagnetic wave can be walked around the barrier that is higher than 100 meters of dual-mode antennas and stop, has bigger diffraction radius.
The present invention can also adopt the form of many remote terminations of a near-end machine interconnection, and this moment, the near-end machine adopted the wireless frequency selecting mode, can distinguish idle time slot and busy time slot.When adopting this kind to drag the mode of N,, the bottom noise of equipment is had certain inhibitory action, so the bottom noise can not superpose during signal uplink because remote termination adopts the digitized signal treatment technology.When for example adopting one to drag six form, the bottom noise during signal uplink is no more than 105 dBm.
After having used the present invention in the field of wireless communications networks, each user's incoming level value obviously improves, and has been brought up in-65 ~ 20 the scope by original-105 ~-75 scopes, and signal strength signal intensity strengthens greatly.Network quality RQ value also is stabilized in about 0, and the wireless network downloading rate has been brought up to 512kbit by original 25kbit.

Claims (5)

1.3G wideband digital very-long-range wireless transmitting system; It is characterized in that: comprise be arranged on be used on the base station with high-frequency signal change into intermediate-freuqncy signal the near-end machine, be arranged on and be used for WCDMA data card that intermediate-freuqncy signal is reduced to the remote termination of high-frequency signal and is arranged on user side on the service station; Through relaying antenna mutual communication, the transmission frequency of relaying antenna adopts intermediate-frequency bandwidth between said near-end machine and the remote termination; Carry out message transmission through service antenna between said WCDMA data card and the service station.
2. 3G wideband digital very-long-range wireless transmitting system according to claim 1 is characterized in that: said near-end machine comprise duplexer I, duplexer II and be arranged on the duplexer I and the duplexer II between radiofrequency signal processing module I; Through the cordless communication network mutual communication, the duplexer II is through mutual communication between relaying antenna and the remote termination between said duplexer I and base station; Said radiofrequency signal processing module I comprises controlled radio frequency attenuator, FPGA I, down conversion module I, low noise amplifier I and passive filter I, and the output of said duplexer I is connected with the input of duplexer II through controlled radio frequency attenuator, FPGA I, down conversion module I, passive filter I successively; The output of said duplexer II is connected with the input of duplexer I through passive filter I, low noise amplifier I, FPGA I, controlled radio frequency attenuator successively.
3. 3G wideband digital very-long-range wireless transmitting system according to claim 2; It is characterized in that: said remote termination comprises duplexer III, duplexer IV and is arranged on the radiofrequency signal processing module II between duplexer III, the duplexer IV; Through relaying antenna mutual communication, pass through the cordless communication network mutual communication between duplexer IV and the service station between said duplexer III and the near-end machine; Said radiofrequency signal processing module II comprises passive filter II, low noise amplifier II, FPGA II, up-conversion module and down conversion module II; The output of said duplexer III is connected with the duplexer IV through passive filter II, low noise amplifier II, FPGA II, up-conversion module successively, and the output of said duplexer IV is connected with the input of duplexer III through low noise amplifier II, FPGA II, down conversion module II, passive filter II successively.
4. 3G wideband digital very-long-range wireless transmitting system according to claim 3; It is characterized in that: be provided with intermediate frequency mixer in said down conversion module I and the down conversion module II, said intermediate frequency mixer all adopts the frequency mixer that is used for the high-frequency signal of 1900 ~ 2200MHz is converted into the 230MHz intermediate-freuqncy signal.
5. 3G wideband digital very-long-range wireless transmitting system according to claim 4, it is characterized in that: said passive filter I and passive filter II all adopt digital filter.
CN201210095636XA 2012-04-01 2012-04-01 3G (third-generation) broadband digitalized super-remote wireless transmission system Pending CN102625477A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107911141A (en) * 2017-11-15 2018-04-13 宁波麦度智联科技股份有限公司 A kind of system for reducing communication terminal frequency and phase error
CN113259048A (en) * 2021-05-31 2021-08-13 成都雷通科技有限公司 X-waveband high-power suppressing interference device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1731702A (en) * 2005-08-10 2006-02-08 林志华 Wimax carrier frequency remote transmission method
CN201248143Y (en) * 2008-08-29 2009-05-27 福建三元达通讯股份有限公司 Pressing belt ultra-far shrouding system
CN102281093A (en) * 2010-06-08 2011-12-14 佳律通信设备(上海)有限公司 Frequency selecting and shifting repeater device capable of automatically correcting flatness
CN202488732U (en) * 2012-04-01 2012-10-10 河北人天通信技术有限公司 3rd generation telecommunication (3G) broadband digitization extra-long-distance wireless transmission system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1731702A (en) * 2005-08-10 2006-02-08 林志华 Wimax carrier frequency remote transmission method
CN201248143Y (en) * 2008-08-29 2009-05-27 福建三元达通讯股份有限公司 Pressing belt ultra-far shrouding system
CN102281093A (en) * 2010-06-08 2011-12-14 佳律通信设备(上海)有限公司 Frequency selecting and shifting repeater device capable of automatically correcting flatness
CN202488732U (en) * 2012-04-01 2012-10-10 河北人天通信技术有限公司 3rd generation telecommunication (3G) broadband digitization extra-long-distance wireless transmission system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107911141A (en) * 2017-11-15 2018-04-13 宁波麦度智联科技股份有限公司 A kind of system for reducing communication terminal frequency and phase error
CN113259048A (en) * 2021-05-31 2021-08-13 成都雷通科技有限公司 X-waveband high-power suppressing interference device
CN113259048B (en) * 2021-05-31 2021-09-14 成都雷通科技有限公司 X-waveband high-power suppressing interference device

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Application publication date: 20120801