CN102761352A - FDD-LTE (Frequency Division Duplexing-Long Term Evolution) indoor coverage system and signal transmission method - Google Patents
FDD-LTE (Frequency Division Duplexing-Long Term Evolution) indoor coverage system and signal transmission method Download PDFInfo
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Abstract
The invention discloses an FDD-LTE (Frequency Division Duplexing-Long Term Evolution) indoor coverage system and a signal transmission method. The system comprises a room distribution system, and an active access host and active antennas, which are respectively connected to both ends of the room distribution system, when downlink signals are transmitted, N-1 way of downlink signals are respectively subjected to frequency conversion to signals with different frequencies through the active access host and are transmitted to the active antennas through the room distribution system, after the frequency conversion of the N-1 way of downlink signals after frequency conversion is restored by the active antennas, the N-1 way of downlink signals are respectively emitted by corresponding antenna arrays; when uplink signals are transmitted, N-1 way of uplink signals are respectively subjected to frequency conversion to signals with different frequencies through the active access host, the N-1 way of downlink signals after frequency conversion are transmitted to the active access host through the room distribution system, after the frequency conversion of the uplink signals are restored through the active access hot, the uplink signals are respectively transmitted to corresponding ports of a base station.
Description
Technical field
The invention belongs to communication technical field, relate in particular to a kind of FDD-LTE indoor covering system and method for transmitting signals.
Background technology
Multiple-input and multiple-output (multi-input-multi-output; MIMO) technology is meant at transmitting terminal and receiving terminal and uses a plurality of transmitting antennas and a plurality of reception antenna respectively; Radio wave signal transmits and receives through a plurality of antennas of transmitting terminal and receiving terminal, thereby improves each quality of services for users (bit error rate or data rate).(single-input-single-output, SISO) antenna system can improve the availability of frequency spectrum to the MIMO antenna system, make antenna system can under the limited wireless frequency band, transmit the data service of higher rate for traditional single output of single input.
(Long Term Evolution, LTE) technology has also been introduced the MIMO technology on signal covers as the Long Term Evolution of 3G mobile communication technology evolution version.The LTE technology can be divided into two kinds of FDD (FDD) and time division duplexs (TDD) according to duplex mode.Wherein, FDD-LTE receives and sends on two symmetrical frequency channels that separate, and separates receiving and transmitting channel with the protection frequency range.FDD must adopt paired frequency, relies on frequency to come the differentiating uplink and downlink link, and its unidirectional resource is continuous in time.FDD can make full use of the frequency spectrum of up-downgoing when supporting symmetrical service, but when supporting non-symmetrical service, the availability of frequency spectrum will reduce greatly.And on the other hand, TDD separates reception and transmitting channel with the time.In the TD-LTE system, receive and send of the carrying of the different time-gap of the same frequency carrier of use as channel, its unidirectional resource is discontinuous in time, time resource distributes on both direction.To travelling carriage, the other time sent signal by travelling carriage and gave the base station by base station transmit signals certain time period, must harmonious ability work between base station and the travelling carriage.
With (chamber branch) scene that distributes in the LTE system chambers is example; Fig. 1 shows the structure of the existing indoor covering system that is only applicable to the SISO technology; Can find out; Prior art has adopted the independent wiring design; Constituted existing indoor covering system by indoor signal compartment system (being also referred to as feeder line compartment system or chamber subsystem) 11 and single indoor cover antenna 12, (Remote RF Unit, the upward signal that downstream signal RRU) and indoor cover antenna receive all transmits through the indoor signal compartment system from the LTE radio frequency remoto module.
In the indoor covering system of LTE system, introduce the MIMO antenna technology and can greatly improve power system capacity.Under indoor distribution scene; Because it is less relatively that disturb the adjacent area; Signal and interference-to-noise ratio (Signal to Interference plus Noise Ratio; SINR) can reach higher level, and because abundant scattering, the refraction condition of indoor environment, the SISO antenna system can have higher transmission rate relatively.With the MIMO antenna system is that double path system is an example, and Fig. 2 shows the system block diagram of existing two-way MIMO indoor covering system.As shown in Figure 2; Said system comprises two FDD-LTE ports; It is connected respectively to two independent indoor signal compartment system 21 and 22; Indoor signal compartment system 21 and 22 is connected respectively to different antennas 23 and 24, thus, through two independent MIMO passage and independently antenna 23,24 realized the two-way MIMO transmitting-receiving of indoor covering.
MIMO antenna system construction mode in the LTE system is mostly for to transform on existing indoor covering system basis at present; There is indoor covering system to adopt the SISO antenna system mostly; Therefore, the construction scheme of existing double path system specifically comprises following dual mode:
Mode one, in the LTE system independent newly-built two-way indoor covering system; Wherein, Antenna implementation in the double path system can be two single-polarized antennas or a dual polarized antenna; No matter antenna adopts two single-polarized antennas still is a dual polarized antenna, all needs newly-built two cover feeder line compartment systems.
Mode two, in the LTE system newly-built one road indoor covering system, and original indoor covering system is used as other one road indoor covering system through mixer.Even original single-polarized antenna is replaced by dual polarized antenna, also need a newly-built cover feeder line compartment system.
Therefore, in the construction scheme of existing double path system, no matter adopt above-mentioned which kind of mode; Even the employing dual polarized antenna also needs newly-built at least one cover feeder line compartment system, need to increase new equipment; And the implementation procedure of newly-built at least one cover feeder line compartment system is also comparatively complicated; Cause the construction cost of double path system higher and realize complicated, if the MIMO antenna system is M road system (M is that integer and M are greater than 2), then can be higher and realize more complicated with respect to the double path system construction cost.
Summary of the invention
The object of the present invention is to provide a kind of signal transmission system, apparatus and method of utilizing independent one road feeder line compartment system transmission MIMO signal.
The invention discloses a kind of FDD-LTE indoor covering system; Comprise the chamber subsystem; It is characterized in that; Said system also comprises active access main frame and the active antenna that is connected to subsystem two ends, said chamber, and said active access main frame and said active antenna are used for parallel transmission two-way uplink/downlink signals
When transmission of downlink signal, said active access main frame is sent to said active antenna with one road downstream signal frequency conversion through said chamber subsystem, and said active antenna recovers this downstream signal to launch after the frequency conversion; When transmission during upward signal, said active antenna will be gone signal frequency conversion on the way, be sent to said active access main frame through said chamber subsystem, and said active access main frame is sent to the base station after with this upward signal recovery frequency conversion.
The invention discloses a kind of method that adopts above-mentioned FDD-LTE indoor covering system to carry out the downstream signal transmission, it is characterized in that said method comprises the steps:
Receive first downstream signal and second downstream signal simultaneously from the information source end;
With the second downstream signal frequency conversion, and be sent to the chamber subsystem after closing the road with first downstream signal;
Second downstream signal is recovered frequency conversion, from second antenna, launch, simultaneously first downstream signal is launched from first antenna.
The invention also discloses and a kind ofly adopt above-mentioned FDD-LTE indoor covering system to carry out the method for uplink signal transmissions, it is characterized in that said method comprises the steps:
First antenna receives first upward signal, and second antenna receives second upward signal simultaneously;
With the second upward signal frequency conversion, and be sent to the chamber subsystem after closing the road with first upward signal;
Second upward signal is recovered frequency conversion, send, simultaneously first upward signal is sent from the first transmitting-receiving port from the second transmitting-receiving port.
The invention also discloses a kind of active access main frame of the FDD-LTE of being used for indoor covering system, comprising:
First the transmitting-receiving port and second the transmitting-receiving port, be used for parallel receive/transmission two-way descending/upward signal;
First frequency-variable module with the said second transmitting-receiving port is connected is used for descending/upward signal frequency conversion/recovery frequency conversion;
Connect first of said first transmitting-receiving port and said first frequency-variable module simultaneously and close road/branching filter; Be sent to said chamber subsystem after being used for to close the road from the downstream signal of said first transmitting-receiving port and said first frequency-variable module, and be used for the upward signal from said chamber subsystem is shunted to said first transmitting-receiving port and said first frequency-variable module.
The invention also discloses a kind of active antenna of the FDD-LTE of being used for indoor covering system, comprising:
First antenna and second antenna, be used for parallel emission/reception two-way descending/upward signal;
With second frequency-variable module that said second antenna is connected, be used for uplink/downlink signals frequency conversion/recovery frequency conversion;
Connect second of said first antenna and said second frequency-variable module simultaneously and close road/branching filter; Be used for to be shunted to said first antenna and said second frequency-variable module from the downstream signal of said chamber subsystem, and be sent to said chamber subsystem after being used for the upward signal from said first antenna and said second frequency-variable module closed the road.
The invention also discloses a kind of FDD-LTE indoor covering system; Comprise the chamber subsystem; It is characterized in that; Said system also comprises active access main frame and the active antenna that is connected to subsystem two ends, said chamber, and said active access main frame and said active antenna are used for parallel transmission N road uplink/downlink signals, and N is the integer greater than 2;
When transmission of downlink signal; Said active access main frame with N-1 road downstream signal respectively frequency conversion be the different and also inequality signal of frequency with downstream signal frequencies; With the downstream signal after the frequency conversion of N-1 road and not one road downstream signal of frequency conversion be sent to said active antenna through said chamber subsystem after closing the road, the downstream signal of said active antenna after with said N-1 road frequency conversion recovers to be launched by corresponding antenna array element respectively after the frequency conversion;
When the transmission upward signal; Said active antenna with N-1 road upward signal respectively frequency conversion be the different and also inequality signal of frequency with the upward signal frequency; With the downstream signal after the frequency conversion of N-1 road and not one road downstream signal of frequency conversion be sent to said active access main frame through said chamber subsystem after closing the road, said active access main frame recovers this upward signal to be sent to the corresponding port in base station respectively after frequency conversion.
The invention also discloses a kind of active access main frame of the FDD-LTE of being used for indoor covering system, comprising:
N-1 road main frame frequency-variable module, be used for N-1 road downstream signal respectively frequency conversion be that frequency is different and also inequality with downstream signal frequencies, simultaneously the upward signal after the frequency conversion of N-1 road is recovered frequency conversion respectively;
Multiband closes the road splitter; One road downstream signal of frequency conversion is sent to said chamber subsystem after closing the road to be used for reaching the downstream signal after the said N-1 road frequency conversion not, and is used for the upward signal from said chamber subsystem is shunted to corresponding main frame frequency-variable module or base station port by frequency;
Wherein, N is the integer more than or equal to 2.
The invention also discloses a kind of active antenna of the FDD-LTE of being used for indoor covering system, comprising:
N-1 road slave frequency-variable module, be used for N-1 road upward signal respectively frequency conversion be that frequency is different and also inequality with downstream signal frequencies, simultaneously the downstream signal after the frequency conversion of N-1 road is recovered frequency conversion respectively;
Multiband closes the road splitter; Be used for that the upward signal after the said N-1 road frequency conversion is reached going on the way of not frequency conversion and be sent to said chamber subsystem after signal closes the road, and be used for the downstream signal from said chamber subsystem is shunted to corresponding slave frequency-variable module or base station port by frequency;
N road antenna, wherein the N-1 road is connected with N-1 road slave frequency-variable module respectively, in addition 1 the tunnel directly closes the road splitter with said multiband and is connected;
Wherein, N is the integer more than or equal to 2.
The embodiment of the invention is based on the FDD-LTE network; Through in existing indoor covering system, increasing active access main frame; And original indoor cover antenna replaced with active antenna; Thereby the wiring not needing to have indoor covering system now is done under the situation of any change, realizes the MIMO technology of FDD-LTE simply, easily, has given full play to the advantage of FDD-LTE technology.
Description of drawings
Fig. 1 is based on the system block diagram of the indoor signal compartment system of SISO technology in the prior art;
Fig. 2 is the system block diagram of two-way MIMO indoor covering system of the prior art;
Fig. 3 is the structure chart of the FDD-LTE indoor covering system that provides of first embodiment of the invention;
Fig. 4 is the structure chart of the FDD-LTE indoor covering system that provides of second embodiment of the invention;
Fig. 5 is the FDD-LTE indoor covering system downstream signal transmission method flow chart that third embodiment of the invention provides;
Fig. 6 is the FDD-LTE indoor covering system uplink signal transmission method flow chart that fourth embodiment of the invention provides;
Fig. 7 is the block diagram of the FDD-LTE indoor covering system of the support N road MIMO signal that provides of fifth embodiment of the invention.
Embodiment
Further specify technical scheme of the present invention below in conjunction with accompanying drawing and through embodiment.
Fig. 3 illustrates the structure of the FDD-LTE indoor covering system that first embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with present embodiment.
As shown in Figure 3; This FDD-LTE indoor covering system possesses first transmission line and second transmission line, simultaneously transmitting two paths up/descending signal, wherein; First transmission line is original indoor covering system signal transmission path; The i.e. transmission path of " information source end <-chamber subsystem <-indoor cover antenna ", and in second transmission line, the indoor covering system of present embodiment is through increasing corresponding frequency-conversion processing in module; The signal that transmits in the signal of its transmission and first transmission line is carried out physical isolation, input and output simultaneously when having realized two paths of signals.
Particularly, except comprising original chamber subsystem 31, this indoor covering system has also comprised:
The active access main frame 32 that is connected with an end of chamber subsystem 31;
Be connected with the other end of chamber subsystem 31, be used to replace the active antenna 33 of original indoor cover antenna, and the installation dimension of active antenna 33 is identical with traditional antenna, to realize the compatibility of system.
In the present embodiment, first transmission line and second transmission line have been included in active access main frame 32 and the active antenna 33.Active access main frame 32 is used for parallel transmission two-way uplink/downlink signals with active antenna 33; When transmission of downlink signal; Active access main frame 32 is with wherein one road downstream signal frequency conversion; Be sent to 33 active antennas through chamber subsystem 31, active antenna 33 recovers this downstream signal to launch after the frequency conversion; When the transmission upward signal, active antenna 33 is sent to active access main frame 32 with wherein going signal frequency conversion on the way through chamber subsystem 31, and active access main frame 32 recovers this upward signal to be sent to the base station after frequency conversion.
Particularly:
Active access main frame 32, it has comprised that the first transmitting-receiving port 321, second is received and dispatched port 322, frequency-variable module 323 and first closes road/branching filter 324, wherein:
The first transmitting-receiving port 321 and the second transmitting-receiving port 322 are separate; Be used for the two-way downstream signal of difference parallel receive, and be used for sending from the corresponding FDD-LTE RRU of information source end port from the two-way upward signal of this locality is parallel from information source end FDD-LTE RRU port one and port 2.
First frequency-variable module 323 is connected the second transmitting-receiving port 322 and first and closes between road/branching filter 324; It is with the downstream signal frequency conversion in second transmission line; And with the recovery of the upward signal in second transmission line frequency conversion; So that in active access main frame 32, parallel two-way uplink/downlink signals can realize physical isolation.
First 321 of the ports of transmitting-receiving directly close road/branching filter 324 and are connected with first; First closes road/branching filter 324 is used for the two-way downstream signal of parallel transmission is sent to chamber subsystem 31 through after closing road filtering; Also be used for the upward signal process from chamber subsystem 31 is generated the two-way upward signal after the filtering along separate routes, be sent to first frequency-variable module 323 and the first transmitting-receiving port 321 respectively.
Active antenna 33, it has comprised that first antenna 331, second antenna 332, second frequency-variable module 333 and second close road/branching filter 334:
First antenna 331 and second antenna 332 are separate, are used for will launching respectively the two-way downstream signal of transmission, and are used for receiving respectively the two paths of signals that need carry out uplink.
Second frequency-variable module 333 is connected second antenna 332 and second and closes between road/branching filter 334; Its downstream signal that will pass through in second transmission line of first frequency-variable module, 323 frequency conversions recovers frequency conversion; And with the upward signal frequency conversion in second transmission line; So that in active antenna 33, parallel two-way uplink/downlink signals can realize physical isolation.
331 on first antenna directly closes road/branching filter 334 and is connected with second; Second closes road/branching filter 334 is used for the two-way upward signal of parallel transmission is sent to chamber subsystem 31 through after closing road filtering; Also be used for the downstream signal process from chamber subsystem 31 is generated the two-way downstream signal after the filtering along separate routes, be sent to first antenna 331 and second frequency-variable module 333 respectively.
The concrete structure of active access main frame 32 and active antenna 33 will be elaborated in follow-up embodiment respectively, not give unnecessary details at this.
Fig. 4 shows the internal structure of the FDD-LTE indoor covering system that second embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with present embodiment.
Present embodiment has carried out refinement to the frequency-variable module in active access main frame of first embodiment of the invention and the active antenna.Of Fig. 4, when carrying out downstream signal when transmission, in active access main frame, in 31, having comprised:
First frequency changer circuit, it is made up of first amplifier 3231 and first mixting circuit 3232, is used for downstream signal is carried out frequency conversion, with the physical isolation of the parallel downstream signal of two-way in the realization and first transmission line.
Simultaneously, in active antenna 33, having comprised:
Second frequency changer circuit 321, it is made up of second mixting circuit 3331 and second amplifier 3332, is used for the downstream signal that has passed through the first frequency changer circuit frequency conversion is recovered frequency conversion, and launches from second antenna 332 via duplexer 3336.
When carrying out uplink signal transmissions, in active antenna 33, having comprised:
The 3rd frequency changer circuit; It is connected through duplexer 3336 with second antenna 332; Constitute by first low noise amplifier 3333, the 3rd mixting circuit 3334 and the 3rd amplifier 3335; Be used for the upward signal that second antenna 332 receives is carried out frequency conversion, to realize the physical isolation of the upward signal that two-way walks abreast in first transmission line.
As one embodiment of the present of invention; In active access main frame 32, also be designed with the local oscillation signal generator; It sends it in the active antenna 33 after having produced local oscillation signal, uses jointly for the mixting circuit in active access main frame 32 and the active antenna 33; Avoiding in active access main frame and active antenna, respectively a designing difference on the frequency that local oscillator generator brought easily in the traditional scheme, and can simplify the circuit of active antenna 33 greatly.
In active access main frame 32, having comprised:
The 4th frequency changer circuit; It is made up of the 4th mixting circuit 3233 and the 4th amplifier 3234; The upward signal that has been used for passing through second transmission line of the 3rd frequency changer circuit frequency conversion recovers frequency conversion, and transfers to the second transmitting-receiving port 322 via duplexer 3236 and send.
Can know that to sum up and with reference to figure 4 first frequency-variable module of the active access main frame 32 of present embodiment comprises first frequency changer circuit, the 4th frequency changer circuit and is connected in first frequency changer circuit and first, second duplexer 3236 and 3235 at the 4th frequency changer circuit two ends.Because FDD-LTE uses the FDD mode to carry out duplex communication, that is, the uplink and downlink signals of FDD-LTE has different carrier frequency.Therefore, use duplexer to come uplink and downlink signals is distinguished.Wherein, First duplexer 3236 connects an end of the second transmitting-receiving port 322 and first, the 4th frequency changer circuit respectively; Carrying out FDD handles; Make uplink signal transmissions to the second transmitting-receiving port 322 that the 4th frequency changer circuit is handled, simultaneously, be transferred to first frequency changer circuit from the downstream signal of the second transmitting-receiving port.Simultaneously; Second duplexer 3235 connects first respectively and closes the input and first of road branching filter 324, the other end of the 4th frequency changer circuit; Carrying out FDD handles; The downstream signal that the frequency changer circuit of winning is handled is transferred to first and closes road branching filter 324, makes uplink signal transmissions to the four frequency changer circuits that close road branching filter 324 from first simultaneously.
Simultaneously, second frequency-variable module of the active antenna 33 of present embodiment comprises second frequency changer circuit, the 3rd frequency conversion electric current and is connected in second frequency changer circuit and the 3rd, the 4th duplexer 3337 and 3336 at the two ends of the 3rd frequency changer circuit.Because FDD-LTE uses the FDD mode to carry out duplex communication, that is, the uplink and downlink signals of FDD-LTE has different carrier frequency.Therefore, use duplexer to come uplink and downlink signals is distinguished.Wherein, The 4th duplexer 3336 connects an end of second antenna 332 and second, third frequency changer circuit respectively; Carrying out FDD handles; The downstream signal that makes second frequency changer circuit handle is transferred to second antenna 332 and sends, and simultaneously, makes uplink signal transmissions to the three frequency changer circuits that are received from second antenna 332.Simultaneously; The 3rd duplexer 3337 connects second respectively and closes the input of road branching filter 324 and the other end of second, third frequency changer circuit; Carrying out FDD handles; The last every trade signal that makes the 3rd frequency changer circuit handle is transferred to second and closes road branching filter 334, feasible simultaneously from second close road branching filter 334 downstream signal be transferred to second frequency changer circuit.
The employing FDD-LTE indoor covering system that Fig. 5 shows third embodiment of the invention to be provided carries out the realization flow of downstream signal transmission, and details are as follows:
In step S501, receive first downstream signal and second downstream signal simultaneously from the information source end.
In step S502,, and be sent to the chamber subsystem after closing the road with first downstream signal with the second downstream signal frequency conversion.
In step S503, second downstream signal is recovered frequency conversion, from second antenna, launch, simultaneously first downstream signal is launched from first antenna.
The employing FDD-LTE indoor covering system that Fig. 6 shows fourth embodiment of the invention to be provided carries out the realization flow of uplink signal transmissions, and details are as follows:
In step S601, first antenna receives first upward signal, and second antenna receives second upward signal simultaneously.
In step S602,, and be sent to the chamber subsystem after closing the road with first upward signal with the second upward signal frequency conversion.
In step S603, second upward signal is recovered frequency conversion, send from the second transmitting-receiving port, simultaneously first upward signal is sent from the first transmitting-receiving port.
Fig. 7 is the block diagram of the FDD-LTE indoor covering system of the support N road MIMO signal that provides of fifth embodiment of the invention.As shown in Figure 7, said system comprises active access main frame 71, indoor distributed system 72 and active antenna 73.
Active access main frame 71 comprises N-1 road main frame frequency-variable module 711; The downstream signal frequency conversion that N-1 road main frame frequency-variable module 711 is used for the input of corresponding N-1 FDD-LTE RRU port is that the different mutually radiofrequency signal of N-1 road signal frequency (also being different from the standard downstream signal frequencies simultaneously) is sent to multiband and closes road splitter 712, and will close the upward signal frequency conversion that the N-1 road frequency of road splitter 712 has nothing in common with each other from multiband simultaneously is that the radiofrequency signal that corresponding LTE RRU port has the unified frequency that can receive sends to corresponding N-1 road LTERRU port.The signal of LTE RRU port N is directly connected to multiband without frequency conversion and closes road splitter 712.The main frame frequency-variable module 711 of not going the same way is corresponding to different frequency conversion frequencies, and the downstream signal of its output has different frequencies each other.Thus; N-1 road main frame frequency-variable module 711 will together constitute N road frequency downstream signal input multiband all inequality from the signal that the identical signal of FDD-LTE RRU port one to the frequency of N-1 is modulated into N-1 road frequency downstream signal all inequality and does not carry out the FDD-LTE RRU port N output of frequency conversion and close road/splitter.In the present embodiment, can also the downstream signal of other system also be input to multiband as one the tunnel separately and close road/splitter 712, wherein, N is the integer greater than 2.
Multiband closes road/splitter 712 and is used for that N road frequency downstream signal all inequality is closed Lu Weiyi road signal and is input to the feeder line compartment system and transmits to active access slave, simultaneously also in the future the upward signal of self-feed line compartment system export to corresponding main frame frequency-variable module 711 by frequency after along separate routes and handle.
Among Fig. 7; Internal structure to the No. 1 main frame frequency-variable module 711 is showed; The similar of first frequency-variable module among the internal structure of the No. 1 main frame frequency-variable module 711 and second embodiment comprises the descending frequency changer circuit of main frame, the up frequency changer circuit of main frame and is connected in the descending frequency changer circuit of main frame and first, second duplexer 7115 and 7116 at the up frequency changer circuit of main frame two ends.Wherein the descending frequency changer circuit of main frame comprises descending amplifier 7111 of main frame connected in series and main frame downstream mixer 7112; The descending frequency changer circuit of main frame is used for the 1 road downstream signal from the unified downlink transfer frequency of having of first duplexer 7116 is carried out frequency conversion; With its frequency conversion is the downstream signal with the 1st descending frequency conversion frequency, is sent to via second duplexer 7115 that multiband closes the road splitter and other N-1 road signal closes the road.
The up frequency changer circuit of main frame comprises the main frame upstream mixer 7114 and main frame upstream amplifier 7113 that is connected in series; The up frequency changer circuit of main frame is used for the upward signal with the 1st up frequency conversion frequency through frequency conversion from second duplexer 7115 is recovered frequency conversion; With its frequency conversion is the upward signal with unified FDD-LTE uplink frequency, is sent to FDD-LTE RRU port via first duplexer 7116.
Similarly; The 2 the road to the N-1 road main frame frequency-variable module 711 and the No. 1 main frame frequency-variable module have similar structure; The difference of itself and the No. 1 main frame frequency-variable module is that wherein amplifier, frequency mixer all have the different working frequency; The n road downstream signal frequency conversion that realizes having unified downstream frequency thus is the downstream signal with the descending frequency conversion frequency of n; The upward signal recovery frequency conversion that will have the up frequency conversion frequency of n is the upward signal with unified FDD-LTE uplink frequency, wherein, and n=2 ~ N-1.Wherein, the standard of the descending frequency conversion frequency of the 1st descending frequency conversion frequency to the N-1, the up frequency conversion frequency of the 1st up frequency conversion frequency to the N-1 and FDD-LTE up and down downstream signal frequencies be 2N different frequency each other.
Multiband closes road/splitter 731 and is used for handling exporting to corresponding slave frequency-variable module 732 by frequency after along separate routes from the downstream signal of chamber subsystem 72, will close the Lu Weiyi road from the upward signal with different frequency of N road slave frequency-variable module 732 and antenna 733 simultaneously and export to the rf distributed system transmissions.
N road slave frequency-variable module 732 is used for that the downstream signal frequency conversion of closing different other each the road signal frequencies of having of road/splitter 731 from multiband is reverted to the signal with standard FDD-LTE downstream signal frequencies to be transferred to corresponding n road antenna 733 and sends, and the signal frequency conversion with standard LTE upward signal frequency that also n road antenna 733 is received simultaneously is that the upward signal of the corresponding up frequency conversion frequency of n road signal outputs to multiband and closes road/splitter 731 and close the road.
Among Fig. 7; Internal structure to the 1 road slave frequency-variable module 731 is showed; The similar of second frequency-variable module among the internal structure of the 1 road slave frequency-variable module 731 and second embodiment comprises the descending frequency changer circuit of slave, the up frequency changer circuit of slave and is connected in the 3rd, the 4th duplexer 7327 and 7326 of every trade frequency changer circuit and the up frequency changer circuit of slave two ends under the slave.Wherein the descending frequency changer circuit of slave comprises slave downstream mixer connected in series 7321 and the descending amplifier 7322 of slave; The descending frequency changer circuit of slave is used for the 1 road downstream signal with the 1st descending frequency conversion frequency from the 3rd duplexer 7327 is recovered frequency conversion; With its frequency conversion is the signal with standard FDD-LTE downstream signal frequencies, sends the No. 1 antenna 733 via the 4th duplexer 7326 and sends to the terminal.
The up frequency changer circuit of slave comprises the up low noise amplifier 7323 of slave upstream amplifier 7325, slave upstream mixer 7324 and slave that is connected in series; The up frequency changer circuit of slave is used for the process standard FDD-LTE upward signal frequency upward signal from the 4th duplexer 7326 is carried out frequency conversion; With its frequency conversion is the upward signal with the 1st up frequency conversion frequency, is sent to multiband via the 3rd duplexer 7327 and closes road splitter 731.
Similarly; The 2 the road to the N-1 road slave frequency-variable module 732 and the 1 road slave frequency-variable module have similar structure; The difference of itself and the 1 road slave frequency-variable module is that wherein amplifier, frequency mixer all have the different working frequency; The n road downstream signal frequency conversion that realizes having unified upstream frequency thus is the upward signal with the up frequency conversion frequency of n; The downstream signal recovery frequency conversion that will have the descending frequency conversion frequency of n is the downstream signal with unified FDD-LTE downlink transfer frequency, wherein, and n=2 ~ N-1.Wherein, the standard of the descending frequency conversion frequency of the 1st descending frequency conversion frequency to the N-1, the up frequency conversion frequency of the 1st up frequency conversion frequency to the N-1 and FDD-LTE up and down downstream signal frequencies be 2N different frequency each other.
The embodiment of the invention is based on the FDD-LTE network; Through in existing indoor covering system, increasing active access main frame; And original indoor cover antenna replaced with active antenna; Thereby the wiring not needing to have indoor covering system now is done under the situation of any change, realizes the MIMO technology of FDD-LTE simply, easily, has given full play to the advantage of FDD-LTE technology.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and to those skilled in the art, the present invention can have various changes and variation.All any modifications of within spirit of the present invention and principle, being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (20)
1. FDD-LTE indoor covering system; Comprise the chamber subsystem, it is characterized in that said system also comprises active access main frame and the active antenna that is connected to subsystem two ends, said chamber; Said active access main frame and said active antenna are used for parallel transmission two-way uplink/downlink signals
When transmission of downlink signal, said active access main frame is sent to said active antenna with one road downstream signal frequency conversion through said chamber subsystem, and said active antenna recovers this downstream signal to launch after the frequency conversion; When transmission during upward signal, said active antenna will be gone signal frequency conversion on the way, be sent to said active access main frame through said chamber subsystem, and said active access main frame is sent to the base station after with this upward signal recovery frequency conversion.
2. the system of claim 1 is characterized in that, said active access main frame comprises:
First the transmitting-receiving port and second the transmitting-receiving port, be used for parallel receive/transmission two-way descending/upward signal;
First frequency-variable module with the said second transmitting-receiving port is connected is used for descending/upward signal frequency conversion/recovery frequency conversion;
Connect first of said first transmitting-receiving port and said first frequency-variable module simultaneously and close road/branching filter; Be sent to said chamber subsystem after being used for to close the road from the downstream signal of said first transmitting-receiving port and said first frequency-variable module, and be used for the upward signal from said chamber subsystem is shunted to said first transmitting-receiving port and said first frequency-variable module.
3. the system of claim 1 is characterized in that, said active antenna comprises:
First antenna and second antenna, be used for parallel emission/reception two-way descending/upward signal;
With second frequency-variable module that said second antenna is connected, be used for uplink/downlink signals frequency conversion/recovery frequency conversion;
Connect second of said first antenna and said second frequency-variable module simultaneously and close road/branching filter; Be used for to be shunted to said first antenna and said second frequency-variable module from the downstream signal of said chamber subsystem, and be sent to said chamber subsystem after being used for the upward signal from said first antenna and said second frequency-variable module closed the road.
4. system as claimed in claim 2 is characterized in that, said first frequency-variable module comprises:
First frequency changer circuit is used for the downstream signal frequency conversion, and said first frequency changer circuit comprises first amplifier and first frequency mixer;
The 4th frequency changer circuit is used for upward signal is recovered frequency conversion, and said the 4th frequency changer circuit comprises the 4th frequency mixer and the 4th amplifier;
Said second frequency-variable module comprises:
Second frequency changer circuit is used for downstream signal is recovered frequency conversion, and said second frequency changer circuit comprises second frequency mixer and second amplifier;
The 3rd frequency changer circuit is used for the upward signal frequency conversion, and said the 3rd frequency changer circuit comprises first low noise amplifier, three-mixer and the 3rd amplifier.
5. system as claimed in claim 4 is characterized in that, said first frequency-variable module also comprises:
Be connected to first duplexer and second duplexer at said first frequency changer circuit and said the 4th frequency changer circuit two ends, be used for the uplink/downlink signals of said first frequency changer circuit and said the 4th frequency changer circuit is carried out duplex transmission;
Said second frequency-variable module also comprises:
Be connected to the 3rd duplexer and the 4th duplexer at said second frequency changer circuit and said the 3rd frequency changer circuit two ends, be used for the uplink/downlink signals of said second frequency changer circuit and said the 3rd frequency changer circuit is carried out duplex transmission.
6. an employing such as each described FDD-LTE indoor covering system of claim 1 to 5 carry out the method for downstream signal transmission, it is characterized in that said method comprises the steps:
Receive first downstream signal and second downstream signal simultaneously from the information source end;
With the second downstream signal frequency conversion, and be sent to the chamber subsystem after closing the road with first downstream signal;
Second downstream signal is recovered frequency conversion, from second antenna, launch, simultaneously first downstream signal is launched from first antenna.
7. an employing such as each described FDD-LTE indoor covering system of claim 1 to 5 carry out the method for uplink signal transmissions, it is characterized in that said method comprises the steps:
First antenna receives first upward signal, and second antenna receives second upward signal simultaneously;
With the second upward signal frequency conversion, and be sent to the chamber subsystem after closing the road with first upward signal;
Second upward signal is recovered frequency conversion, send, simultaneously first upward signal is sent from the first transmitting-receiving port from the second transmitting-receiving port.
8. active access main frame that is used for the FDD-LTE indoor covering system comprises:
First the transmitting-receiving port and second the transmitting-receiving port, be used for parallel receive/transmission two-way descending/upward signal;
First frequency-variable module with the said second transmitting-receiving port is connected is used for descending/upward signal frequency conversion/recovery frequency conversion;
Connect first of said first transmitting-receiving port and said first frequency-variable module simultaneously and close road/branching filter; Be sent to said chamber subsystem after being used for to close the road from the downstream signal of said first transmitting-receiving port and said first frequency-variable module, and be used for the upward signal from said chamber subsystem is shunted to said first transmitting-receiving port and said first frequency-variable module.
9. active access main frame as claimed in claim 8 is characterized in that, said first frequency-variable module comprises:
First frequency changer circuit is used for the downstream signal frequency conversion, and said first frequency changer circuit comprises first amplifier and first frequency mixer;
The 4th frequency changer circuit is used for upward signal is recovered frequency conversion, and said the 4th frequency changer circuit comprises the 4th frequency mixer and the 4th amplifier.
10. active access main frame as claimed in claim 9 is characterized in that, said first frequency-variable module also comprises:
Be connected to first duplexer and second duplexer at said first frequency changer circuit and said the 4th frequency changer circuit two ends, be used for the uplink/downlink signals of said first frequency changer circuit and said the 4th frequency changer circuit is carried out duplex transmission.
11. an active antenna that is used for the FDD-LTE indoor covering system comprises:
First antenna and second antenna, be used for parallel emission/reception two-way descending/upward signal;
With second frequency-variable module that said second antenna is connected, be used for uplink/downlink signals frequency conversion/recovery frequency conversion;
Connect second of said first antenna and said second frequency-variable module simultaneously and close road/branching filter; Be used for to be shunted to said first antenna and said second frequency-variable module from the downstream signal of said chamber subsystem, and be sent to said chamber subsystem after being used for the upward signal from said first antenna and said second frequency-variable module closed the road.
12. active antenna as claimed in claim 11 is characterized in that, said second frequency-variable module comprises:
Second frequency changer circuit is used for downstream signal is recovered frequency conversion, and said second frequency changer circuit comprises second frequency mixer and second amplifier;
The 3rd frequency changer circuit is used for the upward signal frequency conversion, and said the 3rd frequency changer circuit comprises first low noise amplifier, three-mixer and the 3rd amplifier.
13. active antenna as claimed in claim 12, said second frequency-variable module also comprises:
Be connected to the 3rd duplexer and the 4th duplexer at said second frequency changer circuit and said the 3rd frequency changer circuit two ends, be used for the uplink/downlink signals of said second frequency changer circuit and said the 3rd frequency changer circuit is carried out duplex transmission.
14. FDD-LTE indoor covering system; Comprise the chamber subsystem; It is characterized in that; Said system also comprises active access main frame and the active antenna that is connected to subsystem two ends, said chamber, and said active access main frame and said active antenna are used for parallel transmission N road uplink/downlink signals, and N is the integer greater than 2;
When transmission of downlink signal; Said active access main frame with N-1 road downstream signal respectively frequency conversion be the different and also inequality signal of frequency with downstream signal frequencies; With the downstream signal after the frequency conversion of N-1 road and not one road downstream signal of frequency conversion be sent to said active antenna through said chamber subsystem after closing the road, the downstream signal of said active antenna after with said N-1 road frequency conversion recovers to be launched by corresponding antenna array element respectively after the frequency conversion;
When the transmission upward signal; Said active antenna with N-1 road upward signal respectively frequency conversion be the different and also inequality signal of frequency with the upward signal frequency; With the downstream signal after the frequency conversion of N-1 road and not one road downstream signal of frequency conversion be sent to said active access main frame through said chamber subsystem after closing the road, said active access main frame recovers this upward signal to be sent to the corresponding port in base station respectively after frequency conversion.
15. FDD-LTE indoor covering system as claimed in claim 14 is characterized in that, said active access main frame comprises:
N-1 road main frame frequency-variable module, be used for N-1 road downstream signal respectively frequency conversion be that frequency is different and also inequality with downstream signal frequencies, simultaneously the upward signal after the frequency conversion of N-1 road is recovered frequency conversion respectively;
Multiband closes the road splitter; One road downstream signal of frequency conversion is sent to said chamber subsystem after closing the road to be used for reaching the downstream signal after the said N-1 road frequency conversion not, and is used for the upward signal from said chamber subsystem is shunted to corresponding main frame frequency-variable module or base station port by frequency.
Said active antenna comprises:
N-1 road slave frequency-variable module, be used for N-1 road upward signal respectively frequency conversion be that frequency is different and also inequality with downstream signal frequencies, simultaneously the downstream signal after the frequency conversion of N-1 road is recovered frequency conversion respectively;
Multiband closes the road splitter; Be used for that the upward signal after the said N-1 road frequency conversion is reached going on the way of not frequency conversion and be sent to said chamber subsystem after signal closes the road, and be used for the road downstream signal that closes from said chamber subsystem is shunted to corresponding slave frequency-variable module or antenna by frequency;
N road antenna, wherein the N-1 road is connected with N-1 road slave frequency-variable module respectively, in addition 1 the tunnel directly closes the road splitter with said multiband and is connected.
16. FDD-LTE indoor covering system as claimed in claim 15 is characterized in that:
N road main frame frequency-variable module comprises the descending frequency changer circuit of main frame, the up frequency changer circuit of main frame and is connected to the descending frequency changer circuit of main frame and first, second duplexer at the up frequency changer circuit of main frame two ends;
The descending frequency changer circuit of main frame is used for the n road downstream signal with unified downstream signal frequencies from first duplexer is carried out frequency conversion; With its frequency conversion is the downstream signal with the descending frequency conversion frequency of n, is sent to multiband via second duplexer and closes the road splitter;
The up frequency changer circuit of main frame is used for the upward signal with the up frequency conversion frequency of n through frequency conversion from second duplexer is recovered frequency conversion; With its frequency conversion is the upward signal with unified uplink frequency, is sent to the respective base station port via first duplexer;
N road slave frequency-variable module comprises the descending frequency changer circuit of slave, the up frequency changer circuit of slave and is connected in the 3rd, the 4th duplexer of every trade frequency changer circuit and the up frequency changer circuit of slave two ends under the slave;
The descending frequency changer circuit of slave is used for the n road downstream signal with the descending frequency conversion frequency of n from the 3rd duplexer is recovered frequency conversion; With its frequency conversion is the signal with unified downstream signal frequencies, sends alignment terminal, sky, n road via the 4th duplexer and sends;
The up frequency changer circuit of slave is used for the upward signal from the unified upward signal frequency of having of the 4th duplexer is recovered frequency conversion, is the upward signal with the up frequency conversion frequency of n with its frequency conversion, is sent to multiband via the 3rd duplexer and closes the road splitter;
Wherein, n=1 ~ N-1, the descending frequency conversion frequency of the 1st descending frequency conversion frequency to the N-1, the up frequency conversion frequency of the 1st up frequency conversion frequency to the N-1 are 2N different frequency each other with the standard uplink and downlink signals frequency of FDD-LTE.
17. an active access main frame that is used for the FDD-LTE indoor covering system comprises:
N-1 road main frame frequency-variable module, be used for N-1 road downstream signal respectively frequency conversion be that frequency is different and also inequality with downstream signal frequencies, simultaneously the upward signal after the frequency conversion of N-1 road is recovered frequency conversion respectively;
Multiband closes the road splitter; One road downstream signal of frequency conversion is sent to said chamber subsystem after closing the road to be used for reaching the downstream signal after the said N-1 road frequency conversion not, and is used for the upward signal from said chamber subsystem is shunted to corresponding main frame frequency-variable module or base station port by frequency;
Wherein, N is the integer more than or equal to 2.
18. active access main frame as claimed in claim 17; It is characterized in that n road main frame frequency-variable module comprises the descending frequency changer circuit of main frame, the up frequency changer circuit of main frame and is connected in the descending frequency changer circuit of main frame and first, second duplexer at the up frequency changer circuit of main frame two ends;
The descending frequency changer circuit of main frame is used for the n road downstream signal with unified downstream signal frequencies from first duplexer is carried out frequency conversion; With its frequency conversion is the downstream signal with the descending frequency conversion frequency of n, is sent to multiband via second duplexer and closes the road splitter;
The up frequency changer circuit of main frame is used for the upward signal with the up frequency conversion frequency of n through frequency conversion from second duplexer is recovered frequency conversion; With its frequency conversion is the upward signal with unified uplink frequency, is sent to the respective base station port via first duplexer;
Wherein, n=1 ~ N-1, the descending frequency conversion frequency of the 1st descending frequency conversion frequency to the N-1, the up frequency conversion frequency of the 1st up frequency conversion frequency to the N-1 are 2N different frequency each other with the standard uplink and downlink signals frequency of FDD-LTE.
19. an active antenna that is used for the FDD-LTE indoor covering system comprises:
N-1 road slave frequency-variable module, be used for N-1 road upward signal respectively frequency conversion be that frequency is different and also inequality with downstream signal frequencies, simultaneously the downstream signal after the frequency conversion of N-1 road is recovered the downstream signal of frequency conversion unified frequency respectively;
Multiband closes the road splitter; Be used for that the upward signal after the said N-1 road frequency conversion is reached going on the way of not frequency conversion and be sent to said chamber subsystem after signal closes the road, and be used for the downstream signal from said chamber subsystem is shunted to corresponding slave frequency-variable module or base station port by frequency;
N road antenna, wherein the N-1 road is connected with N-1 road slave frequency-variable module respectively, in addition 1 the tunnel directly closes the road splitter with said multiband and is connected;
Wherein, N is the integer more than or equal to 2.
20. active antenna as claimed in claim 19; It is characterized in that n road slave frequency-variable module comprises the descending frequency changer circuit of slave, the up frequency changer circuit of slave and is connected to the 3rd, the 4th duplexer of every trade frequency changer circuit and the up frequency changer circuit of slave two ends under the slave;
The descending frequency changer circuit of slave is used for the n road downstream signal with the descending frequency conversion frequency of n from the 3rd duplexer is recovered frequency conversion; With its frequency conversion is the signal with unified downstream signal frequencies, sends alignment terminal, sky, n road via the 4th duplexer and sends;
The up frequency changer circuit of slave is used for the upward signal from the unified upward signal frequency of having of the 4th duplexer is recovered frequency conversion, is the upward signal with the up frequency conversion frequency of n with its frequency conversion, is sent to multiband via the 3rd duplexer and closes the road splitter;
Wherein, n=1 ~ N-1, the descending frequency conversion frequency of the 1st descending frequency conversion frequency to the N-1, the up frequency conversion frequency of the 1st up frequency conversion frequency to the N-1 are 2N different frequency each other with the standard uplink and downlink signals frequency of FDD-LTE.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102614780A CN102761352A (en) | 2011-08-01 | 2012-07-26 | FDD-LTE (Frequency Division Duplexing-Long Term Evolution) indoor coverage system and signal transmission method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110218430.7 | 2011-08-01 | ||
| CN 201110218430 CN102281548A (en) | 2011-08-01 | 2011-08-01 | Frequency domain decomposition-long term evolution (FDD-LTE) indoor coverage system |
| CN2012102614780A CN102761352A (en) | 2011-08-01 | 2012-07-26 | FDD-LTE (Frequency Division Duplexing-Long Term Evolution) indoor coverage system and signal transmission method |
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| CN102761352A true CN102761352A (en) | 2012-10-31 |
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| CN 201110218430 Pending CN102281548A (en) | 2011-07-14 | 2011-08-01 | Frequency domain decomposition-long term evolution (FDD-LTE) indoor coverage system |
| CN2012102614780A Pending CN102761352A (en) | 2011-08-01 | 2012-07-26 | FDD-LTE (Frequency Division Duplexing-Long Term Evolution) indoor coverage system and signal transmission method |
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| CN 201110218430 Pending CN102281548A (en) | 2011-07-14 | 2011-08-01 | Frequency domain decomposition-long term evolution (FDD-LTE) indoor coverage system |
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| WO (1) | WO2013016905A1 (en) |
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Also Published As
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|---|---|
| CN102281548A (en) | 2011-12-14 |
| WO2013016905A1 (en) | 2013-02-07 |
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