CN101562875A - Mobile communication system and method - Google Patents
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- CN101562875A CN101562875A CNA200910107443XA CN200910107443A CN101562875A CN 101562875 A CN101562875 A CN 101562875A CN A200910107443X A CNA200910107443X A CN A200910107443XA CN 200910107443 A CN200910107443 A CN 200910107443A CN 101562875 A CN101562875 A CN 101562875A
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Abstract
The invention is applicable to the field of mobile communication technology and provides a mobile communication system and a method; the system comprises a near end device, a middle end device and a far end device, wherein the near end device is used for converting downlink radiofrequency signals received from at least two base stations into digital signals and transmitting the digital signals to the middle end device; the middle end device is used for receiving the digital signals transmitted by the near end device and recovering the digital signals to the radiofrequency signals and transmitting the radiofrequency signal to the far end device; the far end device is used for receiving the radiofrequency signals transmitted from the middle end device and outputting the radiofrequency signals after amplifying the signals by a power amplifier. The mobile communication system can consider multi-network coverage, avoid the loss of the useful signal in transmission process, reduce the network investment and improve the main performance index of the mobile communication system such as the coverage quality of 3G high-speed service.
Description
Technical field
The invention belongs to the mobile communication technology field, relate in particular to a kind of mobile communication system and method.
Background technology
At present, mobile communication system has realized the covering of 3G mobile communication, and the user rises to high-speed data-flow from simple Speech Communication to network requirement.The signal quality of 3G, concerning each operator all be enterprise operation this.At present the domestic three big operators that have 3G license are also managing the 2G network simultaneously, and therefore, for the solution of two nets unifications and guarantee that especially the solution of the professional covering of 3G high-speed data-flow emerges in an endless stream, existing solution mainly contains following several:
1, indoor baseband processing unit (Building Baseband Unite, BBU)+far-end RF module (Remote Radio Unite, solution RRU).Because the BBU transmission is baseband digital signal, therefore this solution is very little to the noise effect of system, and what RRU used simultaneously is Optical Fiber Transmission, and networking mode is flexible, and loss is little, also is fit to the seamless covering of 3G signal.But its shortcoming also exists simultaneously: RRU+BBU can not take into account two nets simultaneously, and the RRU of single carrier is cheap, and the RRU of multicarrier is just very expensive, and that coverage mode remains is high-power+traditional mode that distributes, the 384K business of 3G is still needed to improve the mode of field intensity.
2, category-5 cable and optical fiber distribution system: this scheme is by inserting main frame from the base station coupled signal, then by after the radiofrequency signal modulation is become digital intermediate frequency signal, transmission medium by category-5 cable or optical fiber is delivered to far-end with signal, distal power is generally very little, do not connect antenna or connect several antennas, by like this that amplifier is preposition mode, help the high speed business covering quality of 3G, can also be compatible the covering of 2G system.Simultaneously, intermediate conveyor be category-5 cable or optical fiber, difficulty of construction is little, and is also very little to the influence of property.But its shortcoming is exactly: use the category-5 cable transmission bandwidth limited, can not effectively transmit the signal of 3G high bandwidth, its transmission range is also restricted.Very high with optical fiber as transmission cost, there is not competitive advantage with present RRU+BBU solution.
3,3G+2G repeater settling mode: the repeater is in whole indoor distribution solution, also accounted for very important position, because its low price, operator transforms for the 3G of original 2G system at present, is to increase 3G equipment and adjust antenna on the basis of original equipment.By Practical Calculation, because of 3G signal loss in feeder line is bigger, generally speaking, the 3G repeater of 1 10W also can only guarantee effective covering of more than 45 antenna.Such website gets off, and employed repeater quantity increases greatly.Because the repeater possesses the multicarrier enlarging function, cover the soft handover problem that also can avoid with base station overlay area with the repeater simultaneously.If but its shortcoming is exactly many with repeater quantity, can be very big to the base station noise overlaying influence.
Therefore, existing system can not be taken into account loss, the minimizing network investment that covers, evades in the useful signal transmission, the main performance index that improve these mobile communication system of covering quality of 3G high speed business of netting simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of mobile communication system, the mobile communication system that is intended to solve prior art can not be taken into account the problem of the multinomial main performance index of mobile communication system simultaneously.
The present invention is achieved in that a kind of mobile communication system, and described system comprises:
Near-end device is used for will converting digital signal to from the downlink radio-frequency signal that at least two base stations receive respectively, and is transmitted through the fiber to middle end device;
Middle end device is used to receive the digital signal that described near-end device is transmitted, and described digital signal is reduced into radiofrequency signal, transfers to far end device by coaxial cable;
Far end device is used for receiving the radiofrequency signal of described end device transmission, and described radiofrequency signal is amplified the back by power amplifier export; After the up radiofrequency signal that also is used for receiving from portable terminal is amplified by low noise amplifier, transfer to described middle end device by coaxial cable;
End device also is used to receive the up radiofrequency signal of described far end device transmission in described, and described up radiofrequency signal is reduced into digital signal, is transmitted through the fiber to described near-end device;
Described near-end device also is used for receiving the digital signal of described end device transmission, and converts thereof into radiofrequency signal, is sent to the base station.
Another object of the present invention is to provide a kind of method of utilizing aforesaid mobile communication system transmission downlink radio-frequency signal, described method comprises the steps:
Near-end device receives downlink radio-frequency signal from the base station;
The downlink radio-frequency signal that near-end device will receive from the base station converts digital signal to;
Near-end device by means of the described digital signal of Optical Fiber Transmission to middle end device;
Middle end device is reduced to radiofrequency signal with described digital signal;
Middle end device transfers to far end device with described radiofrequency signal by coaxial cable;
Far end device amplifies the back with described radiofrequency signal by power amplifier and exports by antenna.
Another object of the present invention is to provide a kind of method of utilizing aforesaid mobile communication system to transmit up radiofrequency signal, described method comprises the steps:
The radiofrequency signal of far end device mobile terminal receive emission;
Far end device amplifies described radiofrequency signal by low noise amplifier;
Far end device transmits described radiofrequency signal to middle end device by means of coaxial cable;
Middle end device is reduced to digital signal with described radiofrequency signal;
Middle end device is transmitted through the fiber to near-end device with described digital signal;
Near-end device converts described digital signal to radiofrequency signal;
Near-end device is sent to the base station with described radiofrequency signal.
In invention, the middle end device of the mobile communication system that provides will receive descending digital signal from near-end device by optical fiber and be reduced into radiofrequency signal, transfer to far end device by coaxial cable again, compare existing mobile communications system, can overcome many shortcomings of existing mobile communication system, concrete advantage is: 1, the solution of many net coverings.In two nets or many net coverings, only need to install the such mobile communication system of a cover, just can satisfy effective covering of a plurality of networks.And along with the increase of number of carriers, to not influence of system.Such solution can be avoided the repeated construction of network.2, each small-power unit power output is between 50mW～200mW.Mobile communication system provided by the invention is come assurance work by the mode of feed, and can rationally adjust according to the environment needs from the feeder line that is connected between the unit.3, reduce the quantity of high-power repeater, its cost of investment and repeater are suitable, and coverage effect is better than.Suppose that compartment system has 36 terminals, each terminal power is at 50mW, and the antenna amount that each terminal can be with is 4, and antenna amount can reach 144 cover antenna altogether.And calculate according to traditional optical fiber repeater, 45 surface antennas can be with in the 3G repeater of every 10W, so just need 3 repeaters just can reach same coverage effect.4, little to the system noise influence.5, save signal power.In the traditional scheme, come out, be connected to antenna system by feeder line from powerful device, its feeder line determined antenna opening power apart from length.In the feeder line of long Distance Transmission, a lot of power all are lost in transmission and have suffered, and project installation just must be changed the thick line cable like this.1/2 cable for example is exactly 100 meters 10.7dB to the loss of 3G signal.Waste to power is very big.In this case, can only be under the not enough situation of power, added the amplifier of 3G, after power was amplified again again, antenna was given in reallocation.Run into the system ovelay range dilatation, this situation again can emergent power be distributed not enoughly, guarantees the conversation of new overlay area so add multiplying arrangement again.Simultaneously, according to the WCDMA system, cover if reach the business of high speed Internet access, its antenna opening power and day line density need very high requirement, have increased construction investment.In compartment system, can also see and use 7/8 cable in a large number, because the loss of 3G frequency is too big.And, can ignore in the transmission active loss, because the amplification coefficient of far-end has remedied this loss to signal by the mobile communication system that the embodiment of the invention provides.In addition, in the mobile communication system that the embodiment of the invention provides, adopt digital fiber, solved the covering of 3G and cable in transmission course to the 3G signal loss problem.
Description of drawings
Fig. 1 is the composition frame chart of the mobile communication system that provides of the embodiment of the invention;
Fig. 2 is the workflow schematic diagram of in the mobile communication system that provides of the embodiment of the invention downlink radio frequency signal of communication being handled;
Fig. 3 is the workflow schematic diagram of in the mobile communication system that provides of the embodiment of the invention up rf communication signal being handled.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in the qualification invention.
In embodiments of the present invention, the middle end device of the mobile communication system that provides will receive descending digital signal from near-end device by optical fiber and be reduced into radiofrequency signal, transfer to far end device by coaxial cable again, compare existing mobile communications system, can overcome many shortcomings of existing mobile communication system, reach the multinomial main performance index that to take into account mobile communication system simultaneously.
Fig. 1 shows the composition of the mobile communication system that the embodiment of the invention provides, and for convenience of explanation, only shows the relevant part of the embodiment of the invention.This mobile communication system comprises: near-end device 11, middle end device 12, far end device 13.
Wherein, being connected by optical fiber between near-end device 11 and the middle end device 12, finishing the transmission of digital signal, is that coaxial cable is connected by feeder line between middle end device 12 and the far end device 13, finishes the transmission of radiofrequency signal.
Near-end device 11 is responsible for and will be converted digital signal to by the descending communication signal that coupler receives from the base station, and give middle end device 12 by Optical Fiber Transmission, concrete communication process is as described below: near-end device 11 by coupler from the base station receiving communication signal, through duplexer downstream signal is isolated, pass through frequency mixer then, convert descending communication signal to analog if signal, through digital sample, analog if signal is converted into digital signal, then by the data optical fiber interface with digital signal by Optical Fiber Transmission to middle end device 12 data optical fiber interfaces.After middle end device 12 data optical fiber interfaces receive signal, useful signal is chosen by digital filter, through the D/A conversion, be reduced into analog if signal, carry out mixing through frequency mixer again, be reduced into radiofrequency signal, by power amplifier (Power Amplifier, PA) amplify, pass through duplexer again, select downstream signal, send into the radio frequency branching unit, be divided into some branch roads by the radio frequency branching unit, in embodiments of the present invention, adopt 36 road radio frequency branching units, radiofrequency signal is divided into 36 the tunnel, with 36 road coaxial cables, the radiofrequency signal of transmitting each branch road arrives after far end device 13 receives the radiofrequency signal of being transmitted in the far end device 13, therefrom isolates downstream signal, and described downstream signal undertaken giving antenna after the processing and amplifying by PA, user side just can receive movable signal, and power amplifier all has remedying of a gain to all losses, signal can be covered well the service area of far-end like this.
The transmission of up signal also is like this, far end device 13 receives from the signal of mobile phone emission by antenna, signal is passed through low noise amplifier (Lower Noise Amplifier, LNA) amplify, to guarantee to have enough signal to noise ratios, be transferred to middle end device 12 through coaxial cable, after middle end device 12 receives this signal, once amplify by LNA again, to improve signal to noise ratio, enter frequency mixer then, convert analog if signal to digital signal, this digital signal process filtration back is extremely arrived near-end device 11 by the data optical fiber interface by means of Optical Fiber Transmission, and near-end device 11 is reduced into radiofrequency signal after described digital signal is changed, by sending it back the base station after the coupler coupling.
What Fig. 2 showed that the embodiment of the invention provides is the realization flow of the method for mobile communication of example with the transmission downlink radio-frequency signal, and details are as follows:
In step S201, near-end device is from the base station received RF signal.
In step S202, the radiofrequency signal that near-end device will receive from the base station converts digital signal to.
As one embodiment of the present of invention, the radiofrequency signal that near-end device will receive by coupling from the base station is isolated downstream signal by duplexer, pass through frequency mixer then, convert descending communication signal to analog if signal, carry out digital sample by A/D again, analog if signal is converted into digital signal, filters out wherein useful digital signal by digital filter.
In step S203, near-end device by means of the described digital signal of Optical Fiber Transmission to middle end device.
As one embodiment of the present of invention, the useful digital signal that near-end device will filter out by its data optical fiber interface by Optical Fiber Transmission to middle end device.
In step S204, middle end device is reduced to radiofrequency signal with described digital signal.
As one embodiment of the present of invention, the data optical fiber interface of middle end device chooses useful signal after receiving digital signal by optical fiber by digital filter, through the D/A conversion, be reduced into intermediate-freuqncy signal, carry out mixing through frequency mixer again, be reduced into radiofrequency signal.
In step S205, middle end device is with described radiofrequency signal demultiplexing.
As one embodiment of the present of invention, power amplifier amplifies the radiofrequency signal of reduction, select downstream signal by duplexer, send into the radio frequency branching unit, by the radio frequency branching unit described downstream signal is divided into some branch roads, in embodiments of the present invention, adopt 36 road radio frequency branching units, radiofrequency signal is divided into 36 the tunnel, and with 36 road coaxial cables, the radiofrequency signal of transmitting each branch road arrives in the far end device.
In step S206, middle end device transfers to far end device with described multi-channel rf signal by coaxial cable.
In step S207, far end device amplifies the back with described radiofrequency signal by PA and exports by antenna.
After far end device receives the radiofrequency signal of being transmitted, therefrom isolate downstream signal, and described downstream signal undertaken giving antenna after the processing and amplifying by PA, user side just can receive movable signal, power amplifier all has remedying of a gain to all losses, can ignore in the transmission the active loss of signal, signal can be covered well the service area of far-end like this.
Fig. 3 show that the embodiment of the invention provides to transmit the realization flow that up radiofrequency signal is the method for mobile communication of example, details are as follows:
In step S301, the radiofrequency signal of far end device mobile terminal receive emission.
In step S302, far end device amplifies described radiofrequency signal by low noise amplifier.
As one embodiment of the present of invention, after far end device receives radiofrequency signal from portable terminal, earlier therefrom isolate upward signal, more described isolated up radiofrequency signal is amplified by low noise amplifier, enough signal to noise ratios are arranged to guarantee described radiofrequency signal by duplexer.
In step S303, far end device transmits described radiofrequency signal to middle end device by means of coaxial cable.
As one embodiment of the present of invention, the radiofrequency signal after far end device will amplify is again by the signal beyond the duplexer filtering upward signal, relends to help coaxial cable and transmit up radiofrequency signal to middle end device.
In step S304, middle end device is reduced to digital signal with described radiofrequency signal.
As one embodiment of the present of invention, after the radio frequency branching unit of middle end device receives radiofrequency signal by coaxial cable, go out up radiofrequency signal by diplexer separates, by low noise amplifier described radiofrequency signal is amplified again, convert thereof into intermediate-freuqncy signal by frequency mixer again, convert thereof into digital signal by A/D again, extract wherein useful signal, send described digital signal to near-end device by the data optical fiber interface at last by digital filter.
In step S305, middle end device is transmitted through the fiber to near-end device with described digital signal.
In step S306, near-end device converts described digital signal to radiofrequency signal.
As one embodiment of the present of invention, after near-end device receives the digital signal of being transmitted, select useful signal by digital filter, convert thereof into analog if signal by D/A again, described analog if signal converts radiofrequency signal to again by frequency mixer, go out wherein up radiofrequency signal by diplexer separates,, give the base station after the coupling by coupler.
In step S307, near-end device is sent to the base station with described radiofrequency signal.
As one embodiment of the present of invention, the up radiofrequency signal by diplexer separates goes out sends to the base station by the coupler coupling, has realized the transmission of upward signal.
In embodiments of the present invention, the middle end device of the mobile communication system that provides will receive descending digital signal from near-end device by optical fiber and be reduced into radiofrequency signal, transfer to far end device by coaxial cable again, compare existing mobile communications system, can overcome many shortcomings of existing mobile communication system, reach the multinomial main performance index that can take into account mobile communication system simultaneously, concrete have a following advantage:
1, the solution of many net coverings.In two nets or many net coverings, only need to install the such mobile communication system of a cover, just can satisfy effective covering of a plurality of networks.And along with the increase of number of carriers, to not influence of system.Such solution can be avoided the repeated construction of network.
2, each small-power unit power output is between 50mW～200mW.Mobile communication system provided by the invention is come assurance work by the mode of feed, and can rationally adjust according to the environment needs from the feeder line that is connected between the unit.Adopt the cable of different size.The WCDMA system is a noise limited system in 3G, for the covering of WCDMA, by this mode that amplifier is preposition, can enlarge high-speed data user's the area of coverage.In the WCDMA system, mobile phone nearby can provide high-speed data, and mobile phone at a distance can only provide low speed data, has had WCDMA small-power compartment system to can be good at overcoming this problem.By calculating, in this way, can improve upstream noise coefficient 20dB.
3, reduce the quantity of high-power repeater, its cost of investment and repeater are suitable, and coverage effect is better than.Suppose that compartment system has 36 terminals, each terminal power is at 50mW, and the antenna amount that each terminal can be with is 4, and antenna amount can reach 144 cover antenna altogether.And calculate according to traditional optical fiber repeater, 45 surface antennas can be with in the 3G repeater of every 10W, so just need 3 repeaters just can reach same coverage effect.
4, little to the system noise influence, in theory, 1 repeater of every increase, the increment of noise is 10logN, wherein N is the quantity of repeater.We can contrast down the noise incremental quantity to system.
During normal temperature, the total output noise power of system is:
No[dBm]＝-174[dBm/Hz]+10logBW[Hz]+NF[dB]+G[dB]
Ordinary circumstance, the sensitivity thresholding that the base station is provided with are-120dBm/100KHz that in the time of normal temperature, system's output total noise power just is:
No[dBm]＝-124[dBm/100KHz]+NF[dB]+G[dB]
Suppose that the base station power output is 43dBm, for digital small-power compartment system,
G＝PPU-PBTS＝-26dB。
The noise factor of fiber distribution unit is assumed to be 4dB, add 36 fiber optic stretch unit after, the total output noise power of system is:
No[dBm]＝-124[dBm/100KHz]+NF[dB]+10logN+G[dB]＝-124+4+16-26＝-130dBm
Its noise of the increase of equipment has been submerged in the white noise, can not bring the increase of noise.
We take another look at the noise that 3 10W equipment bring system, and the noise factor of supposing equipment is 4dB, add 3 equipment after, the noise of system is:
No[dBm]＝-124[dBm/100KHz]+NF[dB]+10logN+G[dB]＝-124+4+5-3＝-118dBm
In addition, the digital fiber unit also has decrease of noise functions, and its access can not cause any interference to system, and is also highly beneficial to the support of data business on the contrary!
5, save signal power.In the traditional scheme, come out, be connected to antenna system by feeder line from powerful device, its feeder line determined antenna opening power apart from length.In the feeder line of long Distance Transmission, a lot of power all are lost in transmission and have suffered, and project installation just must be changed the thick line cable like this.1/2 cable for example is exactly 100 meters 10.7dB to the loss of 3G signal.Waste to power is very big.In this case, can only be under the not enough situation of power, added the amplifier of 3G, after power was amplified again again, antenna was given in reallocation.Run into the system ovelay range dilatation, this situation again can emergent power be distributed not enoughly, guarantees the conversation of new overlay area so add multiplying arrangement again.Simultaneously, according to the WCDMA system, cover if reach the business of high speed Internet access, its antenna opening power and day line density need very high requirement, have increased construction investment.In compartment system, can also see and use 7/8 cable in a large number, because the loss of 3G frequency is too big.And, can ignore in the transmission active loss, because the amplification coefficient of far-end has remedied this loss to signal by the mobile communication system that the embodiment of the invention provides.In addition, in the mobile communication system that the embodiment of the invention provides, adopt digital fiber, solved the covering of 3G and cable in transmission course to the 3G signal loss problem.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of mobile communication system is characterized in that, described system comprises:
Near-end device is used for will converting digital signal to from the downlink radio-frequency signal that at least two base stations receive respectively, and is transmitted through the fiber to middle end device;
Middle end device is used to receive the digital signal that described near-end device is transmitted, and described digital signal is reduced into radiofrequency signal, transfers to far end device by coaxial cable;
Far end device is used for receiving the radiofrequency signal of described end device transmission, and described radiofrequency signal is amplified the back by power amplifier export; After the up radiofrequency signal that also is used for receiving from portable terminal is amplified by low noise amplifier, transfer to described middle end device by coaxial cable;
End device also is used to receive the up radiofrequency signal of described far end device transmission in described, and described up radiofrequency signal is reduced into digital signal, is transmitted through the fiber to described near-end device;
Described near-end device also is used for receiving the digital signal of described end device transmission, and converts thereof into radiofrequency signal, is sent to the base station.
2, the system as claimed in claim 1 is characterized in that, described near-end device comprises:
Duplexer is used for isolating up radiofrequency signal or isolating downlink radio-frequency signal from radiofrequency signal;
Frequency mixer is used for converting described downlink radio-frequency signal to descending analog if signal;
A/D is used for converting described descending analog if signal to descending digital signal;
Digital filter is used for described descending digital signal is carried out filtering;
The data optical fiber interface is used for sending described descending digital signal to described end device; Also be used for receiving the digital uplink signal of described end device transmission;
The digital uplink signal that described digital filter also is used for the transmission of centering end device carries out filtering;
D/A is used for converting the filtered digital uplink signal of described digital filter to up analog if signal;
Described frequency mixer also is used for converting described up analog if signal to radiofrequency signal.
3, the system as claimed in claim 1 is characterized in that, described middle end device comprises:
The data optical fiber interface is used to receive the descending digital signal of described near-end device transmission or sends digital uplink signal to described near-end device;
Digital filter is used for described descending digital signal is carried out filtering;
D/A is used for converting described filtered descending digital signal to descending analog if signal;
Frequency mixer is used for converting described descending analog if signal to radiofrequency signal;
Power amplifier is used for described downlink radio-frequency signal is amplified;
Duplexer is used for isolating up radiofrequency signal or isolating downlink radio-frequency signal from radiofrequency signal;
Low noise amplifier is used for described up radiofrequency signal is amplified;
Described frequency mixer also is used for converting described up radiofrequency signal to up analog if signal;
A/D is used for converting described up analog if signal to digital uplink signal;
Described digital filter also is used for described digital uplink signal is carried out filtering.
4, system as claimed in claim 3 is characterized in that, described middle end device also comprises:
The radio frequency branching unit is used for described downlink radio-frequency signal demultiplexing.
5, the system as claimed in claim 1 is characterized in that, described far end device comprises:
Duplexer is used for isolating up radiofrequency signal or isolating downlink radio-frequency signal from radiofrequency signal;
Power amplifier is used for described downlink radio-frequency signal is amplified;
Low noise amplifier is used for described up radiofrequency signal is amplified.
6, a kind of method of utilizing as each described mobile communication system transmission downlink radio-frequency signal of claim 1 to 5 is characterized in that described method comprises the steps:
Near-end device receives downlink radio-frequency signal from the base station;
The downlink radio-frequency signal that near-end device will receive from the base station converts digital signal to;
Near-end device by means of the described digital signal of Optical Fiber Transmission to middle end device;
Middle end device is reduced to radiofrequency signal with described digital signal;
Middle end device transfers to far end device with described radiofrequency signal by coaxial cable;
Far end device amplifies the back with described radiofrequency signal by power amplifier and exports by antenna.
7, method as claimed in claim 6 is characterized in that, end device transfers to described radiofrequency signal before the step of far end device by coaxial cable in described, and described method also comprises the steps:
Middle end device is with described downlink radio-frequency signal demultiplexing.
8, method as claimed in claim 6 is characterized in that, described middle end device is specially the step that described digital signal is reduced to radiofrequency signal:
The data optical fiber interface receiving digital signals of middle end device;
The digital filter of middle end device filters described digital signal;
The D/A of middle end device is reduced into analog if signal with the digital signal after the described filtration;
The frequency mixer of middle end device is reduced into radiofrequency signal to described analog if signal mixing;
The power amplifier of middle end device amplifies the radiofrequency signal of described reduction.
9, a kind of method of transmitting up radiofrequency signal as each described mobile communication system of claim 1 to 5 of utilizing is characterized in that described method comprises the steps:
The radiofrequency signal of far end device mobile terminal receive emission;
Far end device amplifies described radiofrequency signal by low noise amplifier;
Far end device transmits described radiofrequency signal to middle end device by means of coaxial cable;
Middle end device is reduced to digital signal with described radiofrequency signal;
Middle end device is transmitted through the fiber to near-end device with described digital signal;
Near-end device converts described digital signal to radiofrequency signal;
Near-end device is sent to the base station with described radiofrequency signal.
10, method as claimed in claim 9 is characterized in that, described middle end device is specially the step that described radiofrequency signal is reduced to digital signal:
The radio frequency branching unit received RF signal of middle end device;
The low noise amplifier of middle end device amplifies described radiofrequency signal;
The frequency mixer of middle end device converts described radiofrequency signal to analog if signal;
The A/D of middle end device converts described analog if signal to digital signal;
The digital filter of middle end device filters described digital signal.
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| CNA200910107443XA CN101562875A (en) | 2009-05-19 | 2009-05-19 | Mobile communication system and method |
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| CNA200910107443XA CN101562875A (en) | 2009-05-19 | 2009-05-19 | Mobile communication system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102377027A (en) * | 2010-08-27 | 2012-03-14 | 大唐移动通信设备有限公司 | Active antenna and method for calibrating active antenna |
| CN102571212A (en) * | 2012-02-08 | 2012-07-11 | 深圳国人通信有限公司 | Indoor optical fiber distribution system |
-
2009
- 2009-05-19 CN CNA200910107443XA patent/CN101562875A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102377027A (en) * | 2010-08-27 | 2012-03-14 | 大唐移动通信设备有限公司 | Active antenna and method for calibrating active antenna |
| CN102571212A (en) * | 2012-02-08 | 2012-07-11 | 深圳国人通信有限公司 | Indoor optical fiber distribution system |
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