CN104320790A - TDD (Time Division Duplex)-LTE (Long Term Evolution) multiple-input-multiple-output indoor coverage system - Google Patents
TDD (Time Division Duplex)-LTE (Long Term Evolution) multiple-input-multiple-output indoor coverage system Download PDFInfo
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- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
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Abstract
The invention provides a TDD-LTE multiple-input-multiple-output indoor coverage system. The system comprises an active near-end machine directly coupled with an RRU (Remote Radio Unit) antenna port and a far-end active antenna, wherein the active near-end machine and the far-end active antenna are connected through an indoor signal distribution system. The TDD-LTE multiple-input-multiple-output indoor coverage system uses a directional coupler with high directivity and uplink signal amplitude limiting processing to solve the problem of uplink interference of a traditional envelope detection level trigger scheme. The system further uses a scheme of uplink and downlink frequency converter sharing so as to simplify circuit design, substantially reduce the equipment cost and improve the product cost performance under the condition of no sacrificing of system performance.
Description
Technical field
The present invention relates to technical field of communication equipment, particularly relate to a kind of TDD-LTE multiple-input and multiple-output indoor covering system.
Background technology
Along with the development of information technology, the requirement of people to the network communications technology improves constantly, comprising the communicating of high data traffic of the contents such as data, voice and image, for meeting more and more higher data communication service requirement, 4G communication is because of the technical advantage of its two-forty, and the development in recent years impetus is more and more faster.TD-LTE (timesharing Long Term Evolution) 4G that current China is greatly developing communicates, and the development of its commercial network and industrial chain also reaches its maturity.Multiple-input and multiple-output (Multiple-Input Multiple-Output, MIMO) antenna technology is as one of the key technology of 4G LTE communication standard, use multiple antenna to transmit and receive data respectively at transmitting terminal and receiving terminal, to improve the capacity of channel, also can improve the reliability of channel simultaneously, reduce the error rate.But current traditional 2G, 3G indoor covering system is all adopt single-input single-output (Single-Input Single-Output, SISO) mode, current, for existing Indoor Coverage Reconstruction, mainly adopt the scheme of frequency conversion transmission, for the binary channels mimo system of current mainstream applications, namely be directly transmission that first via signal is remained unchanged, the second road signal frequency conversion is carried out alien frequencies transmission to a different frequency range.
For employing variable-frequency solutions TD-LTE indoor covering system, one of its key technology keeps the real-time synchronization with base station equipment, and there is the envelope detection level triggers synchronization scenario of larger cost advantage at present, exist when up output signal is stronger, the synchronous up-downgoing detected can be disturbed to judge, cause the problem that Synchronization Control switches by mistake, reliability is poor.
Disclose one " the Signal transmissions implementation method of multiple-input and multiple-output, Apparatus and system " in prior art, see that publication number is: 102882573A, publication date is: the Chinese patent of 2013-01-16; This inventive embodiments provides a kind of Signal transmissions implementation method, Apparatus and system of multiple-input and multiple-output, comprise: the signal that the N road frequency sent base station or multi-input/output antenna array is identical modulates all not identical modulation signal of rear generation N road frequency, and utilizes same feeder line compartment system to transmit.Modulation signal that can also be all not identical to the N road frequency transmitted in this feeder line compartment system is demodulated into the identical signal of N road frequency, and access base station or multi-input/output antenna array, thus solve in prior art, in signals transmission based on time division duplex multiple-input and multiple-output, the signal demand sent or receive N road frequency identical transmits through N number of different feeder line compartment system, and the Signal transmissions caused realizes complicated problem.The envelope detection level triggers synchronization scenario of this patent, exists when up output signal is stronger, and Synchronization Control can be caused to switch by mistake; And the application's scheme has made further circuit optimization for uplink interference, greatly promote synchronous interference free performance.
Also disclose one " MIMO frequency conversion system is divided in novel TD-LTE room " in prior art, see that publication number is: 202535360U, publication date is: the Chinese patent of 2012-11-14, the a kind of of this invention realizes the Complete Synchronization of frequency conversion system and base station or minimizing of time delay, the novel TD-LTE room of other system to the interference of native system is avoided to divide MIMO frequency conversion system, comprise near-end machine and remote termination, described near-end machine output is connected through feeder system with remote termination input, described near-end machine comprises the same radiofrequency signal Transfer pipe of multiplex mode, mixer and Surveillance center's unit, described remote termination comprises mixer, the radiofrequency signal transfer passage that multiplex mode is the same, antenna and Surveillance center's unit, by detecting the envelope of radiofrequency signal descending in radiofrequency signal Transfer pipe, control unit is sent into through the shaping of envelope shaping unit, contrast with the built-in mode of operation of control unit, control unit more selected mode of operation exports Synchronization Control code, make the transmitting-receiving of indoor MIMO frequency conversion system synchronous.This patent adopts up-downgoing frequency converter to design separately; And present specification is for TDD-LTE tdd systems, present specification have employed uplink and downlink sharing frequency converter.
Summary of the invention
The technical problem to be solved in the present invention, be to provide a kind of TDD-LTE (time division duplex) multiple-input and multiple-output indoor covering system, adopt directional coupler and the upward signal amplitude limiting processing of high directivity, solve the problem of traditional envelope detection level triggers synchronization scenario uplink interference.
The present invention is achieved in that a kind of TDD-LTE multiple-input and multiple-output indoor covering system, described system comprises: the active near-end machine be connected with RRU antenna port direct-coupling and far-end active antenna, and described active near-end machine is connected by an indoor signal compartment system with between far-end active antenna;
Described active near-end machine comprises: the first filter, the second filter, the 3rd filter, the first directional coupler, the first envelope detection and synchronous control unit, the first up amplifying unit, the first descending amplifying unit, a RF switch, the 2nd RF switch, the first converter unit and first conjunction road/splitter; Far-end active antenna comprises: second closes road/splitter, the 4th filter, the 5th filter, the 6th filter, the 7th filter, the second converter unit, the second directional coupler, the second envelope detection and synchronous control unit, the second up amplifying unit, the second descending amplifying unit, the 3rd RF switch, the 4th RF switch, the second converter unit, mimo antenna one and mimo antenna two;
The port one of described RRU antenna port is connected with the second filter, and the second filter all closes road/splitter with first with the 3rd filter and is connected; The port 2 of RRU antenna port is connected with the first directional coupler through the first filter, and the first directional coupler is connected with the first envelope detection and synchronous control unit, a RF switch respectively; One RF switch is connected with the first envelope detection and synchronous control unit, the first up amplifying unit, the first descending amplifying unit respectively; First up amplifying unit, the first descending amplifying unit are connected with the 2nd RF switch, and the first up amplifying unit, the first descending amplifying unit, the 2nd RF switch are all connected with the first envelope detection and synchronous control unit; 2nd RF switch is connected with the 3rd filter through the first converter unit; First conjunction road/splitter closes road/splitter through indoor signal compartment system and second and is connected;
Described second closes road/splitter is connected with mimo antenna one through the 5th filter; Described second conjunction road/splitter, the 4th filter, the second converter unit, the second directional coupler, the 3rd RF switch connect successively; Second directional coupler is connected with the second envelope detection and synchronous control unit through the 6th filter; 3rd RF switch respectively amplifying unit up with second, the second descending amplifying unit is connected; 4th RF switch respectively amplifying unit up with second, the second descending amplifying unit, the 7th filter is connected; Second envelope detection and synchronous control unit are connected with the 3rd RF switch, the second up amplifying unit, the 4th RF switch respectively; 7th filter is connected with mimo antenna two; By the cooperation of active near-end machine, indoor signal compartment system and far-end active antenna, thus realize in the envelope detection level triggers method of synchronization up anti-interference.
Further, described first filter, the second filter, the 3rd filter all adopt the band pass filter of high rejection ability, for the outer unwanted signal of filter out-band; Described first directional coupler directional couple receives descending input signal; Described first envelope detection and synchronous control unit comprise the RF detection circuit, envelope signal shaping circuit and the synchronization control unit that connect successively, realize following the tracks of the envelope detection of downstream signal, and carry out up-downgoing judgement with a threshold level triggering, final output synchronization control signal; Described first up amplifying unit comprises numerical-control attenuator, rear class amplifying unit, amplitude limiter, wherein amplitude limiter be used for when upward signal is excessive exceed rated output power time, amplitude limiter opens control fast, guarantee that final power output does not exceed rated power, avoid because up output signal is excessive and disturb the first envelope detection and synchronous control unit, causing synchronism switching misoperation; First descending amplifying unit comprises numerical-control attenuator, drive amplification unit; The signal transmitting and receiving that a described RF switch, the 2nd RF switch realize the uplink downlink of time division duplex standard switches; First converter unit comprises frequency mixer, local oscillation circuit; Described first closes road/splitter realizes being transferred to far-end active antenna through feeder line after the TDD-LTE downstream signal after frequency conversion by the TDD-LTE downstream signal of non-for first via frequency conversion and the second tunnel closes road, and the two-way TDD-LTE upward signal that far-end active antenna transmits through feeder line is arrived the non-frequency conversion channel of the first via and the second tunnel frequency conversion channel after being separated.
Further, described 4th filter, the 5th filter, the 6th filter, the 7th filter all adopt the band pass filter of high rejection ability, for the outer unwanted signal of filter out-band; Described second directional coupler directional couple receives descending input signal; Described second envelope detection and synchronous control unit identical with the 26S Proteasome Structure and Function of the first envelope detection and synchronous control unit; Described second closes road/splitter realization arrives the non-frequency conversion channel of the first via and the second tunnel frequency conversion channel by the two-way TDD-LTE downstream signal that active near-end machine transmits through feeder line after being separated, and is transported to active near-end machine through feeder line after the TDD-LTE upward signal after frequency conversion closes road by non-for first via frequency conversion TDD-LTE upward signal and the second tunnel; Described second up amplifying unit comprises the LNA unit, numerical-control attenuator, intermediate amplifying unit, the amplitude limiter that connect successively; Described second descending amplifying unit comprises the numerical-control attenuator, drive amplification unit, the power amplifier unit that connect successively; The signal transmitting and receiving that described 3rd RF switch, the 4th RF switch realize the uplink downlink of time division duplex standard switches; Second converter unit comprises frequency mixer, local oscillation circuit; Described mimo antenna one and mimo antenna two adopt vertical and horizontal dual polarized design, to realize the irrelevance greatly improved in compact space between mimo antenna double-channel signal.
Further, the described cooperation by active near-end machine, indoor signal compartment system and far-end active antenna, thus realize in the envelope detection level triggers method of synchronization up anti-interference, be specially:
In active near-end machine, the TDD-LTE downstream signal that RRU port one exports by the non-frequency conversion channel of the first via leads to after the outer useless noise signal of filter out-band through the second filter band, closes road/splitter flow to far-end active antenna by the feeder line of indoor signal compartment system through first; And the signal of being come by far-end closes through first the TDD-LTE upward signal that road/demultiplexer separates goes out the non-frequency conversion of the first via, then flow to RRU port one after the second filter band pass filter;
Second tunnel is frequency conversion channel, its TDD-LTE downstream signal exported by RRU port 2 outputs to the first directional coupler after the first filter band pass filter, coupled signal is defeated by the first envelope detection and synchronous control unit by the coupling aperture again through the first directional coupler, analogue envelope signal is exported through RF detection circuit, carry out after waveform shaping process through high-speed comparator again, change the up-downgoing transceiving switch-over control signal needed for output first uplink and downlink amplifying unit, the 2nd RF switch module by synchronization control unit;
When TDD-LTE RRU is operated in descending, a RF switching over, to down link, opens the first descending amplifying unit simultaneously, closes the first up amplifying unit; The TDD-LTE downstream signal that RRU port 2 exports is through the first filter, the first directional coupling circuits, the first descending amplifying unit is entered again through a RF switch, namely after numerical-control attenuator, enter drive amplification unit amplify, frequency mixer frequency-conversion processing is entered again through the 2nd RF switch, this frequency variation signal is input to the 3rd filter and carries out bandpass filtering, then to first close road/splitter close road with the TDD-LTE downstream signal of the non-frequency conversion of the first via after together with flow to far-end active antenna via indoor signal compartment system; In like manner, when up work, a RF switching over, to up link, opens the first up amplifying unit simultaneously, closes the first descending amplifying unit; The upward signal transmitted by far-end active antenna, close road/demultiplexer separates through first and go out the second road frequency variation signal, the TDD-LTE upward signal of original frequency range is reverted to successively through the 3rd filter filtering, frequency mixer frequency conversion, 2nd RF switch, numerical-control attenuator, rear class amplifying unit, amplitude limiter, a RF switch, the first directional coupler, the first filter output to TDD-LTE RRU port 2;
In far-end active antenna equipment, the non-frequency conversion channel of the first via, close road/splitter by second and active near-end machine carried the TDD-LTE downstream signal isolating the non-frequency conversion of the first via in the signal of coming, then after the 5th filter band pass filter, output to mimo antenna one be transmitted into the area of coverage; In like manner, the upward signal that mimo antenna one receives, after the 5th filter filtering, closes after road/splitter closes road through second and flows to active near-end machine through indoor signal compartment system;
Second tunnel frequency conversion channel, first close road/splitter through second active near-end machine to be carried in the signal of coming and isolate after the second road frequency variation signal through the 4th filter filtering, enter the TDD-LTE downstream signal that frequency mixer frequency-conversion processing reverts to original frequency range again, coupling aperture again through the second directional coupler exports coupled signal to the 6th filter filtering, give the second envelope detection and synchronous control unit again, namely analogue envelope signal is exported through RF detection circuit, carry out after waveform shaping process through high-speed comparator again, change in output second by synchronization control unit, descending amplifying unit, up-downgoing transceiving switch-over control signal needed for 2nd RF switch module,
When being operated in descending, a RF switching over, to down link, opens the second descending amplifying unit simultaneously, closes the second up amplifying unit; First closing road/splitter through second to carry the Signal separator of coming after the second road frequency variation signal through the 4th filter filtering by active near-end machine, enter the TDD-LTE downstream signal that frequency mixer frequency-conversion processing reverts to original frequency range again, the second descending amplifying unit is entered again through the second directional coupler, the 3rd RF switch, namely after numerical-control attenuator, enter drive amplification unit amplify, carry out high-power amplification through power amplifier unit again, then after the 4th RF switch to the 7th filter filtering, output to mimo antenna two be transmitted into the area of coverage; In like manner, when being operated in up, the TDD-LTE upward signal that mimo antenna two receives is after the 7th filter filtering, be transported to the second up amplifying unit through the 4th RF switch and carry out low noise amplification, namely successively through LNA unit, numerical-control attenuator, intermediate amplifying unit, amplitude limiter, inputing to frequency mixer frequency conversion through the 3rd RF switch, the second directional coupler is again the second road frequency variation signal, after the 4th filter filtering, after closing road/splitter conjunction road through second again, be transported to active near-end machine by indoor signal compartment system.
Further, described system also comprises near-end monitoring module and completes the various parameter queries of active near-end machine, control and fault management capability; And the transmitting-receiving Communication Control completed far-end active antenna; Can also the active near-end machine state information of remote transmission to Surveillance center, and Surveillance center can realize arranging the control of active near-end machine parameters.
Further, described system also comprises remote monitoring module and completes the various parameter queries of far-end active antenna, control and fault management capability, and realizes the transmitting-receiving communication with the near-end monitoring module of active near-end machine through the transmission of indoor signal compartment system.
Tool of the present invention has the following advantages: system of the present invention comprises: the active near-end machine be connected with RRU antenna port direct-coupling and far-end active antenna, and described active near-end machine is connected by an indoor signal compartment system with between far-end active antenna; The present invention adopts directional coupler and the upward signal amplitude limiting processing of high directivity, solves the problem of traditional envelope detection level triggers synchronization scenario uplink interference.And have employed the scheme of uplink and downlink sharing frequency converter, under the condition of not sacrificial system performance, simplify circuit design, sufficiently lower equipment cost, improve product cost.
Accompanying drawing explanation
Fig. 1 is the active near-end machine theory diagram of TDD-LTE multiple-input and multiple-output indoor covering system.
Fig. 2 is TDD-LTE multiple-input and multiple-output indoor covering system far-end active antenna theory diagram.
Fig. 3 is the detailed schematic block diagram of active near-end machine.
The detailed schematic block diagram of Fig. 4 far-end active antenna.
Embodiment
Refer to shown in Fig. 1 and Fig. 2, a kind of TDD-LTE multiple-input and multiple-output indoor covering system of the present invention, described system comprises: the active near-end machine be connected with RRU antenna port direct-coupling and far-end active antenna, and described active near-end machine is connected by an indoor signal compartment system with between far-end active antenna;
Described active near-end machine comprises: the first filter, the second filter, the 3rd filter, the first directional coupler, the first envelope detection and synchronous control unit, the first up amplifying unit, the first descending amplifying unit, a RF switch, the 2nd RF switch, the first converter unit and first conjunction road/splitter; Far-end active antenna comprises: second closes road/splitter, the 4th filter, the 5th filter, the 6th filter, the 7th filter, the second converter unit, the second directional coupler, the second envelope detection and synchronous control unit, the second up amplifying unit, the second descending amplifying unit, the 3rd RF switch, the 4th RF switch, the second converter unit, mimo antenna one and mimo antenna two;
The port one of described RRU antenna port is connected with the second filter, and the second filter all closes road/splitter with first with the 3rd filter and is connected; The port 2 of RRU antenna port is connected with the first directional coupler through the first filter, and the first directional coupler is connected with the first envelope detection and synchronous control unit, a RF switch respectively; One RF switch is connected with the first envelope detection and synchronous control unit, the first up amplifying unit, the first descending amplifying unit respectively; First up amplifying unit, the first descending amplifying unit are connected with the 2nd RF switch, and the first up amplifying unit, the first descending amplifying unit, the 2nd RF switch are all connected with the first envelope detection and synchronous control unit; 2nd RF switch is connected with the 3rd filter through the first converter unit; First conjunction road/splitter closes road/splitter through indoor signal compartment system and second and is connected;
Described second closes road/splitter is connected with mimo antenna one through the 5th filter; Described second conjunction road/splitter, the 4th filter, the second converter unit, the second directional coupler, the 3rd RF switch connect successively; Second directional coupler is connected with the second envelope detection and synchronous control unit through the 6th filter; 3rd RF switch respectively amplifying unit up with second, the second descending amplifying unit is connected; 4th RF switch respectively amplifying unit up with second, the second descending amplifying unit, the 7th filter is connected; Second envelope detection and synchronous control unit are connected with the 3rd RF switch, the second up amplifying unit, the 4th RF switch respectively; 7th filter is connected with mimo antenna two; By the cooperation of active near-end machine, indoor signal compartment system and far-end active antenna, thus realize in the envelope detection level triggers method of synchronization up anti-interference.
Described first filter, the second filter, the 3rd filter all adopt the band pass filter of high rejection ability, for the outer unwanted signal of filter out-band; Described first directional coupler directional couple receives descending input signal, and receives very little to the coupling of up output signal; Described first envelope detection and synchronous control unit comprise the RF detection circuit, envelope signal shaping circuit and the synchronization control unit that connect successively, realize following the tracks of the envelope detection of downstream signal, and carry out up-downgoing judgement with a threshold level triggering, final output synchronization control signal; Described first up amplifying unit comprises numerical-control attenuator, rear class amplifying unit, amplitude limiter, wherein amplitude limiter be used for when upward signal is excessive exceed rated output power time, amplitude limiter opens control fast, guarantee that final power output does not exceed rated power, avoid because up output signal is excessive and disturb the first envelope detection and synchronous control unit, causing synchronism switching misoperation; First descending amplifying unit comprises numerical-control attenuator, drive amplification unit; The signal transmitting and receiving that a described RF switch, the 2nd RF switch realize the uplink downlink of time division duplex standard switches; First converter unit comprises frequency mixer, local oscillation circuit; Described first closes road/splitter realizes being transferred to far-end active antenna through feeder line after the TDD-LTE downstream signal after frequency conversion by the TDD-LTE downstream signal of non-for first via frequency conversion and the second tunnel closes road, and the two-way TDD-LTE upward signal that far-end active antenna transmits through feeder line is arrived the non-frequency conversion channel of the first via and the second tunnel frequency conversion channel after being separated.
Described 4th filter, the 5th filter, the 6th filter, the 7th filter all adopt the band pass filter of high rejection ability, for the outer unwanted signal of filter out-band; Described second directional coupler directional couple receives descending input signal, and receives very little to the coupling of up output signal; Described second envelope detection and synchronous control unit identical with the 26S Proteasome Structure and Function of the first envelope detection and synchronous control unit; Described second closes road/splitter realization arrives the non-frequency conversion channel of the first via and the second tunnel frequency conversion channel by the two-way TDD-LTE downstream signal that active near-end machine transmits through feeder line after being separated, and is transported to active near-end machine through feeder line after the TDD-LTE upward signal after frequency conversion closes road by non-for first via frequency conversion TDD-LTE upward signal and the second tunnel; Described second up amplifying unit comprises the LNA unit, numerical-control attenuator, intermediate amplifying unit, the amplitude limiter that connect successively; Described second descending amplifying unit comprises the numerical-control attenuator, drive amplification unit, the power amplifier unit that connect successively; The signal transmitting and receiving that described 3rd RF switch, the 4th RF switch realize the uplink downlink of time division duplex standard switches; Second converter unit comprises frequency mixer, local oscillation circuit; Described mimo antenna one and mimo antenna two adopt vertical and horizontal dual polarized design, to realize the irrelevance greatly improved in compact space between mimo antenna double-channel signal.
As shown in Figure 3 and Figure 4, wherein, the described cooperation by active near-end machine, indoor signal compartment system and far-end active antenna, thus realize in the envelope detection level triggers method of synchronization up anti-interference, be specially:
In active near-end machine, the TDD-LTE downstream signal that RRU port one exports by the non-frequency conversion channel of the first via leads to after the outer useless noise signal of filter out-band through the second filter band, closes road/splitter flow to far-end active antenna by the feeder line of indoor signal compartment system through first; And the signal of being come by far-end closes through first the TDD-LTE upward signal that road/demultiplexer separates goes out the non-frequency conversion of the first via, then flow to RRU port one after the second filter band pass filter;
Second tunnel is frequency conversion channel, its TDD-LTE downstream signal exported by RRU port 2 outputs to the first directional coupler after the first filter band pass filter, coupled signal is defeated by the first envelope detection and synchronous control unit by the coupling aperture again through the first directional coupler, analogue envelope signal is exported through RF detection circuit, carry out after waveform shaping process through high-speed comparator again, change the up-downgoing transceiving switch-over control signal needed for output first uplink and downlink amplifying unit, the 2nd RF switch module by synchronization control unit;
When TDD-LTE RRU is operated in descending, a RF switching over, to down link, opens the first descending amplifying unit simultaneously, closes the first up amplifying unit; The TDD-LTE downstream signal that RRU port 2 exports is through the first filter, the first directional coupling circuits, the first descending amplifying unit is entered again through a RF switch, namely after numerical-control attenuator, enter drive amplification unit amplify, frequency mixer frequency-conversion processing is entered again through the 2nd RF switch, this frequency variation signal is input to the 3rd filter and carries out bandpass filtering, then to first close road/splitter close road with the TDD-LTE downstream signal of the non-frequency conversion of the first via after together with flow to far-end active antenna via indoor signal compartment system; In like manner, when up work, a RF switching over, to up link, opens the first up amplifying unit simultaneously, closes the first descending amplifying unit; The upward signal transmitted by far-end active antenna, close road/demultiplexer separates through first and go out the second road frequency variation signal, the TDD-LTE upward signal of original frequency range is reverted to successively through the 3rd filter filtering, frequency mixer frequency conversion, 2nd RF switch, numerical-control attenuator, rear class amplifying unit, amplitude limiter, a RF switch, the first directional coupler, the first filter output to TDD-LTE RRU port 2;
Described system also comprises near-end monitoring module and completes the various parameter queries of active near-end machine, control and fault management capability; And the transmitting-receiving Communication Control completed far-end active antenna; Can also the active near-end machine state information of remote transmission to Surveillance center, and Surveillance center can realize arranging the control of active near-end machine parameters.
As shown in Figure 4, in far-end active antenna equipment, the non-frequency conversion channel of the first via, close road/splitter by second and active near-end machine carried the TDD-LTE downstream signal isolating the non-frequency conversion of the first via in the signal of coming, then after the 5th filter band pass filter, output to mimo antenna one be transmitted into the area of coverage; In like manner, the upward signal that mimo antenna one receives, after the 5th filter filtering, closes after road/splitter closes road through second and flows to active near-end machine through indoor signal compartment system;
Second tunnel frequency conversion channel, first close road/splitter through second active near-end machine to be carried in the signal of coming and isolate after the second road frequency variation signal through the 4th filter filtering, enter the TDD-LTE downstream signal that frequency mixer frequency-conversion processing reverts to original frequency range again, coupling aperture again through the second directional coupler exports coupled signal to the 6th filter filtering, give the second envelope detection and synchronous control unit again, namely analogue envelope signal is exported through RF detection circuit, carry out after waveform shaping process through high-speed comparator again, change in output second by synchronization control unit, descending amplifying unit, up-downgoing transceiving switch-over control signal needed for 2nd RF switch module,
When being operated in descending, a RF switching over, to down link, opens the second descending amplifying unit simultaneously, closes the second up amplifying unit; First closing road/splitter through second to carry the Signal separator of coming after the second road frequency variation signal through the 4th filter filtering by active near-end machine, enter the TDD-LTE downstream signal that frequency mixer frequency-conversion processing reverts to original frequency range again, the second descending amplifying unit is entered again through the second directional coupler, the 3rd RF switch, namely after numerical-control attenuator, enter drive amplification unit amplify, carry out high-power amplification through power amplifier unit again, then after the 4th RF switch to the 7th filter filtering, output to mimo antenna two be transmitted into the area of coverage; In like manner, when being operated in up, the TDD-LTE upward signal that mimo antenna two receives is after the 7th filter filtering, be transported to the second up amplifying unit through the 4th RF switch and carry out low noise amplification, namely successively through LNA unit, numerical-control attenuator, intermediate amplifying unit, amplitude limiter, inputing to frequency mixer frequency conversion through the 3rd RF switch, the second directional coupler is again the second road frequency variation signal, after the 4th filter filtering, after closing road/splitter conjunction road through second again, be transported to active near-end machine by indoor signal compartment system.
Described system also comprises remote monitoring module and completes the various parameter queries of far-end active antenna, control and fault management capability, and realizes the transmitting-receiving communication with the near-end monitoring module of active near-end machine through the transmission of indoor signal compartment system.
Although the foregoing describe the specific embodiment of the present invention; but be familiar with those skilled in the art to be to be understood that; specific embodiment described by us is illustrative; instead of for the restriction to scope of the present invention; those of ordinary skill in the art, in the modification of the equivalence done according to spirit of the present invention and change, should be encompassed in scope that claim of the present invention protects.
Claims (6)
1. a TDD-LTE multiple-input and multiple-output indoor covering system, it is characterized in that, described system comprises: the active near-end machine be connected with RRU antenna port direct-coupling and far-end active antenna, and described active near-end machine is connected by an indoor signal compartment system with between far-end active antenna;
Described active near-end machine comprises: the first filter, the second filter, the 3rd filter, the first directional coupler, the first envelope detection and synchronous control unit, the first up amplifying unit, the first descending amplifying unit, a RF switch, the 2nd RF switch, the first converter unit and first conjunction road/splitter; Far-end active antenna comprises: second closes road/splitter, the 4th filter, the 5th filter, the 6th filter, the 7th filter, the second converter unit, the second directional coupler, the second envelope detection and synchronous control unit, the second up amplifying unit, the second descending amplifying unit, the 3rd RF switch, the 4th RF switch, the second converter unit, mimo antenna one and mimo antenna two;
The port one of described RRU antenna port is connected with the second filter, and the second filter all closes road/splitter with first with the 3rd filter and is connected; The port 2 of RRU antenna port is connected with the first directional coupler through the first filter, and the first directional coupler is connected with the first envelope detection and synchronous control unit, a RF switch respectively; One RF switch is connected with the first envelope detection and synchronous control unit, the first up amplifying unit, the first descending amplifying unit respectively; First up amplifying unit, the first descending amplifying unit are connected with the 2nd RF switch, and the first up amplifying unit, the first descending amplifying unit, the 2nd RF switch are all connected with the first envelope detection and synchronous control unit; 2nd RF switch is connected with the 3rd filter through the first converter unit; First conjunction road/splitter closes road/splitter through indoor signal compartment system and second and is connected;
Described second closes road/splitter is connected with mimo antenna one through the 5th filter; Described second conjunction road/splitter, the 4th filter, the second converter unit, the second directional coupler, the 3rd RF switch connect successively; Second directional coupler is connected with the second envelope detection and synchronous control unit through the 6th filter; 3rd RF switch respectively amplifying unit up with second, the second descending amplifying unit is connected; 4th RF switch respectively amplifying unit up with second, the second descending amplifying unit, the 7th filter is connected; Second envelope detection and synchronous control unit are connected with the 3rd RF switch, the second up amplifying unit, the 4th RF switch respectively; 7th filter is connected with mimo antenna two; By the cooperation of active near-end machine, indoor signal compartment system and far-end active antenna, thus realize in the envelope detection level triggers method of synchronization up anti-interference.
2. a kind of TDD-LTE multiple-input and multiple-output indoor covering system according to claim 1, is characterized in that: described first filter, the second filter, the 3rd filter all adopt the band pass filter of high rejection ability, for the outer unwanted signal of filter out-band; Described first directional coupler directional couple receives descending input signal; Described first envelope detection and synchronous control unit comprise the RF detection circuit, envelope signal shaping circuit and the synchronization control unit that connect successively, realize following the tracks of the envelope detection of downstream signal, and carry out up-downgoing judgement with a threshold level triggering, final output synchronization control signal; Described first up amplifying unit comprises numerical-control attenuator, rear class amplifying unit, amplitude limiter, wherein amplitude limiter be used for when upward signal is excessive exceed rated output power time, amplitude limiter opens control fast, guarantee that final power output does not exceed rated power, avoid because up output signal is excessive and disturb the first envelope detection and synchronous control unit, causing synchronism switching misoperation; First descending amplifying unit comprises numerical-control attenuator, drive amplification unit; The signal transmitting and receiving that a described RF switch, the 2nd RF switch realize the uplink downlink of time division duplex standard switches; First converter unit comprises frequency mixer, local oscillation circuit; Described first closes road/splitter realizes being transferred to far-end active antenna through feeder line after the TDD-LTE downstream signal after frequency conversion by the TDD-LTE downstream signal of non-for first via frequency conversion and the second tunnel closes road, and the two-way TDD-LTE upward signal that far-end active antenna transmits through feeder line is arrived the non-frequency conversion channel of the first via and the second tunnel frequency conversion channel after being separated.
3. a kind of TDD-LTE multiple-input and multiple-output indoor covering system according to claim 2, it is characterized in that: described 4th filter, the 5th filter, the 6th filter, the 7th filter all adopt the band pass filter of high rejection ability, for the outer unwanted signal of filter out-band; Described second directional coupler directional couple receives descending input signal; Described second envelope detection and synchronous control unit identical with the 26S Proteasome Structure and Function of the first envelope detection and synchronous control unit; Described second closes road/splitter realization arrives the non-frequency conversion channel of the first via and the second tunnel frequency conversion channel by the two-way TDD-LTE downstream signal that active near-end machine transmits through feeder line after being separated, and is transported to active near-end machine through feeder line after the TDD-LTE upward signal after frequency conversion closes road by non-for first via frequency conversion TDD-LTE upward signal and the second tunnel; Described second up amplifying unit comprises the LNA unit, numerical-control attenuator, intermediate amplifying unit, the amplitude limiter that connect successively; Described second descending amplifying unit comprises the numerical-control attenuator, drive amplification unit, the power amplifier unit that connect successively; The signal transmitting and receiving that described 3rd RF switch, the 4th RF switch realize the uplink downlink of time division duplex standard switches; Second converter unit comprises frequency mixer, local oscillation circuit; Described mimo antenna one and mimo antenna two adopt vertical and horizontal dual polarized design, to realize the irrelevance greatly improved in compact space between mimo antenna double-channel signal.
4. a kind of TDD-LTE multiple-input and multiple-output indoor covering system according to claim 3, it is characterized in that: the described cooperation by active near-end machine, indoor signal compartment system and far-end active antenna, thus realize in the envelope detection level triggers method of synchronization up anti-interference, be specially:
In active near-end machine, the TDD-LTE downstream signal that RRU port one exports by the non-frequency conversion channel of the first via leads to after the outer useless noise signal of filter out-band through the second filter band, closes road/splitter flow to far-end active antenna by the feeder line of indoor signal compartment system through first; And the signal of being come by far-end closes through first the TDD-LTE upward signal that road/demultiplexer separates goes out the non-frequency conversion of the first via, then flow to RRU port one after the second filter band pass filter;
Second tunnel is frequency conversion channel, its TDD-LTE downstream signal exported by RRU port 2 outputs to the first directional coupler after the first filter band pass filter, coupled signal is defeated by the first envelope detection and synchronous control unit by the coupling aperture again through the first directional coupler, analogue envelope signal is exported through RF detection circuit, carry out after waveform shaping process through high-speed comparator again, change the up-downgoing transceiving switch-over control signal needed for output first uplink and downlink amplifying unit, the 2nd RF switch module by synchronization control unit;
When TDD-LTE RRU is operated in descending, a RF switching over, to down link, opens the first descending amplifying unit simultaneously, closes the first up amplifying unit; The TDD-LTE downstream signal that RRU port 2 exports is through the first filter, the first directional coupling circuits, the first descending amplifying unit is entered again through a RF switch, namely after numerical-control attenuator, enter drive amplification unit amplify, frequency mixer frequency-conversion processing is entered again through the 2nd RF switch, this frequency variation signal is input to the 3rd filter and carries out bandpass filtering, then to first close road/splitter close road with the TDD-LTE downstream signal of the non-frequency conversion of the first via after together with flow to far-end active antenna via indoor signal compartment system; In like manner, when up work, a RF switching over, to up link, opens the first up amplifying unit simultaneously, closes the first descending amplifying unit; The upward signal transmitted by far-end active antenna, close road/demultiplexer separates through first and go out the second road frequency variation signal, the TDD-LTE upward signal of original frequency range is reverted to successively through the 3rd filter filtering, frequency mixer frequency conversion, 2nd RF switch, numerical-control attenuator, rear class amplifying unit, amplitude limiter, a RF switch, the first directional coupler, the first filter output to TDD-LTE RRU port 2;
In far-end active antenna equipment, the non-frequency conversion channel of the first via, close road/splitter by second and active near-end machine carried the TDD-LTE downstream signal isolating the non-frequency conversion of the first via in the signal of coming, then after the 5th filter band pass filter, output to mimo antenna one be transmitted into the area of coverage; In like manner, the upward signal that mimo antenna one receives, after the 5th filter filtering, closes after road/splitter closes road through second and flows to active near-end machine through indoor signal compartment system;
Second tunnel frequency conversion channel, first close road/splitter through second active near-end machine to be carried in the signal of coming and isolate after the second road frequency variation signal through the 4th filter filtering, enter the TDD-LTE downstream signal that frequency mixer frequency-conversion processing reverts to original frequency range again, coupling aperture again through the second directional coupler exports coupled signal to the 6th filter filtering, give the second envelope detection and synchronous control unit again, namely analogue envelope signal is exported through RF detection circuit, carry out after waveform shaping process through high-speed comparator again, change in output second by synchronization control unit, descending amplifying unit, up-downgoing transceiving switch-over control signal needed for 2nd RF switch module,
When being operated in descending, a RF switching over, to down link, opens the second descending amplifying unit simultaneously, closes the second up amplifying unit; First closing road/splitter through second to carry the Signal separator of coming after the second road frequency variation signal through the 4th filter filtering by active near-end machine, enter the TDD-LTE downstream signal that frequency mixer frequency-conversion processing reverts to original frequency range again, the second descending amplifying unit is entered again through the second directional coupler, the 3rd RF switch, namely after numerical-control attenuator, enter drive amplification unit amplify, carry out high-power amplification through power amplifier unit again, then after the 4th RF switch to the 7th filter filtering, output to mimo antenna two be transmitted into the area of coverage; In like manner, when being operated in up, the TDD-LTE upward signal that mimo antenna two receives is after the 7th filter filtering, be transported to the second up amplifying unit through the 4th RF switch and carry out low noise amplification, namely successively through LNA unit, numerical-control attenuator, intermediate amplifying unit, amplitude limiter, inputing to frequency mixer frequency conversion through the 3rd RF switch, the second directional coupler is again the second road frequency variation signal, after the 4th filter filtering, after closing road/splitter conjunction road through second again, be transported to active near-end machine by indoor signal compartment system.
5. a kind of TDD-LTE multiple-input and multiple-output indoor covering system according to claim 4, is characterized in that: described system also comprises near-end monitoring module and completes the various parameter queries of active near-end machine, control and fault management capability; And the transmitting-receiving Communication Control completed far-end active antenna; Can also the active near-end machine state information of remote transmission to Surveillance center, and Surveillance center can realize arranging the control of active near-end machine parameters.
6. a kind of TDD-LTE multiple-input and multiple-output indoor covering system according to claim 5, it is characterized in that: described system also comprises remote monitoring module and completes the various parameter queries of far-end active antenna, control and fault management capability, and realize the transmitting-receiving communication with the near-end monitoring module of active near-end machine through the transmission of indoor signal compartment system.
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| CN201410562363.4A CN104320790B (en) | 2014-10-21 | 2014-10-21 | A kind of TDD LTE multiple-input and multiple-output indoor covering systems |
| CN201711181968.9A CN107889120B (en) | 2014-10-21 | 2014-10-21 | Indoor coverage system for improving TDD-LTE uplink interference immunity |
| CN201711181981.4A CN107786990A (en) | 2014-10-21 | 2014-10-21 | A kind of TDD LTE multiple-input and multiple-output indoor covering methods |
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| CN107889120A (en) | 2018-04-06 |
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