CN102932029A - Long term evolution (LTE) indoor distribution system and double-path frequency conversion equipment and method thereof - Google Patents
Long term evolution (LTE) indoor distribution system and double-path frequency conversion equipment and method thereof Download PDFInfo
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Abstract
The invention provides a long term evolution (LTE) indoor distribution system and double-path frequency conversion equipment and a double-path frequency conversion method for the LTE indoor distribution system. The double-path frequency conversion equipment comprises a first part and a second part, wherein the first part comprises a first branch and a second branch; the second part comprises a third branch and a fourth branch; the first branch and the second branch are respectively used for transmitting a path of signal sent to the other end; the third branch and the fourth branch are respectively used for transmitting a path of signal received from the other end; the structures of the first branch and the second branch are the same; and the structures of the third branch and the fourth branch are the same. A specific solution is supplied to the LTE indoor distribution system for supporting multiple input and multiple output (MIMO).
Description
Technical field
The present invention relates to mobile communication technology, relate in particular to a kind of Long Term Evolution (Long Term Evolution, LTE) indoor distributed system and two-way frequency conversion equipment and method.
Background technology
Along with the development of the Internet, the user is growing for the demand of data service, and simultaneously investigation shows that more data service is occurred frequently in indoor scene.Multiple-input and multiple-output (Multiple Input Multiple Output, MIMO) technology is Long Term Evolution (Long Term Evolution, LTE) one of important means of capacity, but the indoor distributed system of at present 2G/3G application mostly is greatly traditional approach, do not support MIMO, alone family throughput and cell throughout are lower, can't satisfy the demand of LTE power system capacity.After LTE introduces, transform indoor distributed system on existing compartment system basis, make its MIMO application demand that satisfies LTE, be the inexorable trend of networking.
Fig. 1 utilizes the frequency conversion path combining technique to realize the scheme schematic diagram of single-line feeder transmission multiple signals, and this scheme is the application of following MIMO in the indoor wireless networks selection of providing convenience.Baseband processing unit (Base Band Unit, BBU) send baseband signal in, through extremely two far end radio frequency signal processing unit (the Remote Radio Unit that send out of Optical Fiber Transmission, RRU), the two-way small-power radiofrequency signal that RRU sends is passed through respectively down-conversion at local module, become the intermediate-freuqncy signal of different frequency and close road output, and then close the road with existing radio system signal, MIMO intermediate-freuqncy signal and other system's radiofrequency signal of closing behind the road are transmitted at a main feeder, then be divided into multichannel by power splitter, satisfy the instructions for use of space division multiplexing; The multisystem signal is when transferring to remote end module, by splitter two-way LTE intermediate-freuqncy signal and other system's radiofrequency signal are separated, and then through on extremely identical with the RRU output rf frequency of up-conversion, transfer to two polarization input ports of dual-polarized indoor distributed antenna, reach the purpose of indoor distribution MIMO.
But, just provided schematic diagram shown in Figure 1 at present, also there is not concrete implementation, particularly there is not the concrete scheme that how to realize frequency conversion.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of LTE indoor distributed system and two-way frequency conversion equipment and method, in order to solve the technical problem that does not have concrete frequency conversion scheme in the prior art in the LTE indoor distributed system.
On the one hand, provide a kind of two-way frequency conversion equipment of LTE indoor distributed system, having comprised:
First and second portion;
Described first comprises: the first branch road and the second branch road;
Described second portion comprises: the 3rd branch road and the 4th branch road;
Described the first branch road and described the second branch road are respectively applied to the signal that transmission of one line sends to the other end;
Described the 3rd branch road and described the 4th branch road are respectively applied to the signal that transmission of one line receives from the described other end;
The composition structure of described the first branch road and described the second branch road is identical;
The composition structure of described the 3rd branch road and described the 4th branch road is identical.
On the other hand, provide a kind of LTE indoor distributed system, comprised above-mentioned two-way frequency conversion equipment.
Again on the one hand, provide a kind of two-way conversion method of LTE indoor distributed system, having comprised:
Adopt the first branch road and the second branch road respectively transmission of one line send to the signal of the other end;
The signal that adopts the 3rd branch road and the 4th branch road difference transmission of one line to receive from the described other end;
The composition structure of described the first branch road and described the second branch road is identical;
The composition structure of described the 3rd branch road and described the 4th branch road is identical.
Pass through technique scheme, provided a kind of two-way frequency conversion scheme, in this two-way frequency conversion scheme, no matter be the two paths of signals that will send to the other end, or from the two paths of signals that the other end receives, this two paths of signals the path of process adopt identical composition structure, can realize symmetrical frequency conversion like this, not only frequency-conversion processing can be realized, signal time delay can also be reduced.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use was done a simply introduction during the below will describe embodiment, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of LTE indoor distributed system in the prior art;
Fig. 2 is the structural representation of near-end machine one embodiment among the present invention;
Fig. 3 is the structural representation of remote termination one embodiment among the present invention;
Fig. 4 is the structural representation of another embodiment of near-end machine among the present invention;
Fig. 5 is the structural representation of another embodiment of remote termination among the present invention;
Fig. 6 is downstream signal transmission schematic diagram among the present invention;
Fig. 7 is uplink signal transmissions schematic diagram among the present invention;
Fig. 8 is the schematic flow sheet of two-way conversion method one embodiment of the present invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The present invention provides a kind of embodiment of equipment, and this equipment comprises first and second portion; Described first comprises: the first branch road and the second branch road; Described second portion comprises: the 3rd branch road and the 4th branch road; Described the first branch road and described the second branch road are respectively applied to the signal that transmission of one line sends to the other end; Described the 3rd branch road and described the 4th branch road are respectively applied to the signal that transmission of one line receives from the described other end; The composition structure of described the first branch road and described the second branch road is identical; The composition structure of described the 3rd branch road and described the 4th branch road is identical.
This equipment can be near-end machine, and this moment, this equipment can be applied in the local module of Fig. 1; Perhaps, this equipment also can be remote termination, and this moment, this equipment can be applied in the remote end module of Fig. 1.
When the said equipment was near-end machine, the above-mentioned other end referred to remote termination; Perhaps, when the said equipment was remote termination, the above-mentioned other end referred to near-end machine.
For near-end machine and remote termination, the path that both upward signals and downstream signal are walked is opposite, for example, and when descending, near-end machine sends downstream signal to remote termination by first, and the second portion through remote termination behind this downstream signal arrival remote termination transmits.When up, remote termination sends upward signal to near-end machine by first, and the second portion through near-end machine behind this upward signal arrival near-end machine transmits.
That is to say, when this equipment was near-end machine, the first above-mentioned branch road and the second branch road were respectively that the two-way downstream signal is processed branch road, and the 3rd branch road and the 4th branch road are that the two-way upward signal is processed branch road; Perhaps,
When this equipment was remote termination, the first above-mentioned branch road and the second branch road were respectively that the two-way upward signal is processed branch road, and the 3rd branch road and the 4th branch road are that the two-way downstream signal is processed branch road.
In the present embodiment, the first branch road adopts identical composition structure with the second branch road, the 3rd branch road adopts identical composition structure with the 4th branch road, so just can be so that the two paths of signals that sends or receive transmits by identical path, namely by symmetrical frequency conversion and path combining technique, because two paths of signals adopts symmetrical technology, can reduce the time delay of two-way LTE system signal.
Preferably, the 3rd above-mentioned branch road and the 4th branch road adopt respectively three grades of conversion systems.
Optionally, under these three grades of conversion systems, the 3rd branch road and the 4th branch road can comprise respectively:
The first filter, the first frequency mixer, intermediate-frequency filter, intermediate frequency amplifier, the second frequency mixer, the second filter, three-mixer, the 3rd filter and the power amplifier of connecting successively;
Described the first filter is used for that the signal that receives from the described other end is carried out the first filtering to be processed;
Described the first frequency mixer is used for the signal after described the first filtering processing is carried out the first frequency-conversion processing;
Described intermediate-frequency filter is used for that the signal after described the first frequency-conversion processing is carried out intermediate frequency filtering to be processed;
Described intermediate frequency amplifier is used for that the signal after the described intermediate frequency filtering processing is carried out intermediate frequency and amplifies processing;
Described the second frequency mixer is used for the signal that described intermediate frequency amplifies after processing is carried out the second frequency-conversion processing;
Described the second filter is used for that the signal after described the second frequency-conversion processing is carried out the second filtering to be processed;
Described three-mixer is used for the signal after described the second filtering processing is carried out the 3rd frequency-conversion processing;
Described the 3rd filter is used for that the signal after described the 3rd frequency-conversion processing is carried out the 3rd filtering to be processed;
Described power amplifier is used for that the signal after described the 3rd filtering processing is carried out power amplification to be processed;
Signal after described power amplification is processed is sent to respectively the receiving port of RRU.
Further, when described equipment was remote termination, described the 3rd branch road and described the 4th branch road also comprised respectively:
Automatic electric-level control (Automatic Level Control, ALC) is connected with described amplifirer, carries out sending to after automatic electric-level control is processed the receiving port of RRU for the signal after described power amplification is processed.
Optionally, the first branch road and the second branch road adopt respectively the one-level conversion system.
At this moment, described the first branch road and described the second branch road comprise respectively:
The 4th frequency mixer and the 4th filter of connecting successively;
Described the 4th frequency mixer is used for the described signal that sends to the other end is carried out the 4th frequency-conversion processing;
Described the 4th filter is used for that the signal after described the 4th frequency-conversion processing is carried out the 4th filtering to be processed;
Signal after described the 4th filtering is processed is sent to the described other end through after closing the road.
Further, when described equipment was remote termination, described the first branch road and described the second branch road also comprised respectively:
Low noise amplifier is connected with described the 4th frequency mixer, is used for the described signal that sends to the other end is carried out sending to described the 4th frequency mixer behind the low noise amplification.
In conjunction with above-mentioned description, the near-end machine that the present invention provides and the structure of remote termination can be referring to Fig. 2 and Fig. 3.
Take near-end machine as example, first adopts the one-level conversion system, and these two passages of the first branch road and the second branch road adopt respectively different local oscillators in order to make the shift frequency frequency not overlapping, close the Lu Houzhi output port.
The two paths of signals that second portion transmits because distinguishing the far-end same port needs to adopt intermediate frequency filtering, and therefore adopt three grades of frequency conversion schemes: two-stage frequency conversion shares local oscillator wherein, in order to reduce the impact that the local frequency drift brings; Third level mixing shares local oscillator with corresponding down going channel respectively.
Scheme and the near-end machine of remote termination are similar, and just the processing of up-downgoing is just changed; The upward signal processing procedure increases low noise amplifier simultaneously, in order to reach the requirement on the signal quality.
The function of each unit among Fig. 2 or Fig. 3 is as follows:
(1) circulator: the control signal one-way transmission, play buffer action, the Inhibitory signal reverse transfer also can be described as isolator;
(2) frequency mixer: realize processing with poor of processed signal frequency and local oscillation signal frequency;
(3) filter (comprising intermediate-frequency filter): realize that required frequency signal passes through, filtering does not need the signal of frequency;
(4) mixer: the signal of realizing two-way or multichannel different frequency merges into one road signal;
(5) amplifier (being intermediate frequency amplifier and low noise amplifier among Fig. 2,3) can be radio frequency amplifier or power amplifier: realize the output level of radiofrequency signal or the lifting of power;
(6) two power splitters: one road signal is divided equally into two paths of signals according to frequency, is actually the contrary of mixer and uses;
(7) automatic electric-level control (Automatic Level Control, ALC): realize that the radio frequency output signal power is stabilized in relatively constant range value;
(8) port one and 2: the input/output end port of near-end machine, namely receive the descending LTE signal of two-way that the RRU emission comes, perhaps the up LTE signal of two-way is inputed to RRU;
(9) port 3 and 4: the input/output end port of remote termination, i.e. the up LTE signal of two-way that reception antenna port emission comes perhaps inputs to antenna port with the descending LTE signal of two-way;
(10) port a and b: the middle connectivity port of near-end machine and remote termination is connected with cable by the indoor distributed system passive device between two ports.
The schematic diagram that the physical circuit that above-mentioned near-end machine and remote termination adopt is realized can be referring to Fig. 4 or Fig. 5, Fig. 4 and Fig. 5 are respectively the schematic diagrames of near-end machine and remote termination, wherein, with 2620-2650MHz as downstream frequency, with 2500-2530MHz as upstream frequency, descending intermediate frequency is taken as 1420-1490MHz, and up intermediate frequency is taken as 1300-1370MHz.
The present embodiment can be realized the low time delay of two paths of signals owing to adopting symmetrical frequency conversion and path combining technique; Adopt three grades of conversion systems by near-end machine ascender and remote termination descender, can the establishment high order harmonic component and all kinds of spurious clutter disturb, realize higher output frequency stability and spuious rejection; By controlling at the terminal automatic electric-level that adopts of remote termination, satisfying the MIMO technology should be for the requirement of two-way output power signal balance.
In conjunction with Fig. 2 or the described structural representation of Fig. 3, the transfer process schematic diagram of downstream signal and upward signal can be referring to Fig. 6 or Fig. 7.
Fig. 6 is the downstream signal transmission schematic diagram in the embodiment of the invention, and wherein, BBU produces baseband signal and is sent to RRU; RRU becomes two-way LTE system radiofrequency signal with the baseband signal that receives, and sends to respectively port one and the port 2 of near-end machine; Near-end machine carries out down-converted to the radiofrequency signal that receives, and the scheme of concrete down-converted can be referring to the one-level mixing part of Fig. 2, namely first; Be converted to intermediate-freuqncy signal through radiofrequency signal after the down-conversion, mixer closes the road to this two-way intermediate-freuqncy signal and processes, and obtains the LTE intermediate-freuqncy signal, from the port a output of near-end machine; Close the road with other system signal afterwards and process, the signal that closes behind the road is that the multisystem signal can transmit in a cable; Power splitter is divided into multichannel with signal, to satisfy the demand of space division multiplexing.The multisystem signal is divided into the two-way intermediate-freuqncy signal from the port b input of remote termination through splitter; Every road intermediate-freuqncy signal is carried out upconversion process, and the scheme of concrete upconversion process can be referring to three grades of mixing parts, namely second portions of Fig. 3; Signal after the process upconversion process is the LTE radiofrequency signal; Port 3 and port 4 that this two-way LTE radiofrequency signal can be passed through respectively remote termination are input to indoor dual polarized antenna, to realize MIMO.
Fig. 7 is the uplink signal transmissions schematic diagram in the embodiment of the invention, and its transmission direction is opposite with downstream signal.Indoor dual polarized antenna sends to the two-way LTE radiofrequency signal that receives respectively port 3 and the port 4 of remote termination; The one-level frequency conversion part of remote termination is carried out down-converted to the LTE radiofrequency signal, obtains the intermediate-freuqncy signal of two-way; The intermediate-freuqncy signal of two-way and other system signal obtain the multisystem signal through behind the mixer, and the multisystem signal can be from the port b output of remote termination.Power splitter is divided into multichannel with signal, to satisfy the demand of space division multiplexing.Be divided into LTE intermediate-freuqncy signal and other system signal through splitter; The LTE intermediate-freuqncy signal is from the port a input of near-end machine, become the intermediate-freuqncy signal of two-way through splitter, three grades of frequency conversion parts of near-end machine are carried out up-conversion to intermediate-freuqncy signal, become LTE system radiofrequency signal, the LTE system radiofrequency signal of two-way is input to respectively RRU afterwards, obtains baseband signal after processing through RRU and sends to BBU.
Fig. 8 is the schematic flow sheet of two-way conversion method one embodiment of the present invention, comprising:
Step 81: adopt the first branch road and the second branch road respectively transmission of one line send to the signal of the other end;
Step 82: the signal that adopts the 3rd branch road and the 4th branch road difference transmission of one line to receive from the described other end;
The composition structure of described the first branch road and described the second branch road is identical;
The composition structure of described the 3rd branch road and described the 4th branch road is identical.
Optionally, described employing the 3rd branch road and the 4th branch road difference transmission of one line comprise from the signal that the described other end receives:
Adopt three grades of conversion systems, transmission of one line is from the signal of described other end reception respectively.
Further, three grades of conversion systems can specifically comprise:
Signal to described reception carries out the first filtering processing, the first Frequency mixing processing, intermediate frequency filtering processing, intermediate frequency amplification processing, the second Frequency mixing processing, the second filtering processing, the 3rd Frequency mixing processing, the 3rd filtering processing and power amplifier processing successively.
Optionally, described employing the 3rd branch road and the 4th branch road difference transmission of one line can also comprise from the signal that the described other end receives:
Signal after described three grades of frequency conversions is carried out ALC to be processed.
Optionally, described the first frequency mixer adopts identical local oscillator with described the second frequency mixer.
Optionally, described employing the first branch road and the second branch road respectively transmission of one line send to the signal of the other end, comprising:
Adopt frequency mixer and filter, transmission of one line sends to the signal of the other end respectively.
Further, described employing the first branch road and the second branch road respectively transmission of one line send to the signal of the other end, also comprise:
Adopt low noise amplifier that the described signal that sends to the other end is processed, so that the signal after will processing adopts frequency mixer and filter transmission again.
The present embodiment can be realized the low time delay of two paths of signals owing to adopting symmetrical frequency conversion and path combining technique; Adopt three grades of conversion systems by near-end machine ascender and remote termination descender, can the establishment high order harmonic component and all kinds of spurious clutter disturb, realize higher output frequency stability and spuious rejection; By controlling at the terminal automatic electric-level that adopts of remote termination, satisfying the MIMO technology should be for the requirement of two-way output power signal balance.
One of ordinary skill in the art will appreciate that: all or part of step that realizes above-mentioned each embodiment of the method can be finished by the relevant hardware of program command.Aforesaid program can be stored in the computer read/write memory medium.This program is carried out the step that comprises above-mentioned each embodiment of the method when carrying out; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above each embodiment is not intended to limit only in order to technical scheme of the present invention to be described; Although with reference to aforementioned each embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps some or all of technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the scope of various embodiments of the present invention technical scheme.
Claims (13)
1. the two-way frequency conversion equipment of a LTE indoor distributed system is characterized in that, comprising:
First and second portion;
Described first comprises: the first branch road and the second branch road;
Described second portion comprises: the 3rd branch road and the 4th branch road;
Described the first branch road and described the second branch road are respectively applied to the signal that transmission of one line sends to the other end;
Described the 3rd branch road and described the 4th branch road are respectively applied to the signal that transmission of one line receives from the described other end;
The composition structure of described the first branch road and described the second branch road is identical;
The composition structure of described the 3rd branch road and described the 4th branch road is identical.
2. equipment according to claim 1 is characterized in that, described the 3rd branch road and described the 4th branch road all adopt three grades of conversion systems.
3. equipment according to claim 2 is characterized in that, described the 3rd branch road and described the 4th branch road comprise respectively:
The first filter, the first frequency mixer, intermediate-frequency filter, intermediate frequency amplifier, the second frequency mixer, the second filter, three-mixer, the 3rd filter and the amplifirer of connecting successively;
Described the first filter is used for that the signal that receives from the described other end is carried out the first filtering to be processed;
Described the first frequency mixer is used for the signal after described the first filtering processing is carried out the first frequency-conversion processing;
Described intermediate-frequency filter is used for that the signal after described the first frequency-conversion processing is carried out intermediate frequency filtering to be processed;
Described intermediate frequency amplifier is used for that the signal after the described intermediate frequency filtering processing is carried out intermediate frequency and amplifies processing;
Described the second frequency mixer is used for the signal that described intermediate frequency amplifies after processing is carried out the second frequency-conversion processing;
Described the second filter is used for that the signal after described the second frequency-conversion processing is carried out the second filtering to be processed;
Described three-mixer is used for the signal after described the second filtering processing is carried out the 3rd frequency-conversion processing;
Described the 3rd filter is used for that the signal after described the 3rd frequency-conversion processing is carried out the 3rd filtering to be processed;
Described amplifirer is used for that the signal after described the 3rd filtering processing is carried out power amplification to be processed;
Signal after described power amplification is processed is sent to respectively the receiving port of RRU.
4. equipment according to claim 3 is characterized in that, when described equipment was remote termination, described the 3rd branch road and described the 4th branch road also comprised respectively:
ALC is connected with described amplifirer, carries out sending to after automatic electric-level control is processed the receiving port of RRU for the signal after described power amplification is processed.
5. equipment according to claim 3 is characterized in that,
Described the first frequency mixer adopts identical local oscillator with described the second frequency mixer.
6. each described equipment is characterized in that according to claim 1-5, and described the first branch road and described the second branch road comprise respectively:
The 4th frequency mixer and the 4th filter of connecting successively;
Described the 4th frequency mixer is used for the described signal that sends to the other end is carried out the 4th frequency-conversion processing;
Described the 4th filter is used for that the signal after described the 4th frequency-conversion processing is carried out the 4th filtering to be processed;
Signal after described the 4th filtering is processed is sent to the described other end through after closing the road.
7. equipment according to claim 6 is characterized in that, when described equipment was remote termination, described the first branch road and described the second branch road also comprised respectively:
Low noise amplifier is connected with described the 4th frequency mixer, is used for the described signal that sends to the other end is carried out sending to described the 4th frequency mixer behind the low noise amplification.
8. a LTE indoor distributed system comprises each described equipment such as claim 1-7.
9. the two-way conversion method of a LTE indoor distributed system is characterized in that, comprising:
Adopt the first branch road and the second branch road respectively transmission of one line send to the signal of the other end;
The signal that adopts the 3rd branch road and the 4th branch road difference transmission of one line to receive from the described other end;
The composition structure of described the first branch road and described the second branch road is identical;
The composition structure of described the 3rd branch road and described the 4th branch road is identical.
10. method according to claim 9 is characterized in that, described employing the 3rd branch road and the 4th branch road respectively transmission of one line comprise from the signal that the described other end receives:
Adopt three grades of conversion systems, transmission of one line is from the signal of described other end reception respectively.
11. method according to claim 10 is characterized in that, described employing the 3rd branch road and the 4th branch road respectively transmission of one line also comprise from the signal that the described other end receives:
Signal after described three grades of frequency conversions is carried out ALC to be processed.
12. each described method is characterized in that according to claim 9-11, described employing the first branch road and the second branch road respectively transmission of one line send to the signal of the other end, comprising:
Adopt frequency mixer and filter, transmission of one line sends to the signal of the other end respectively.
13. method according to claim 12 is characterized in that, described employing the first branch road and the second branch road respectively transmission of one line send to the signal of the other end, also comprise:
Adopt low noise amplifier that the described signal that sends to the other end is processed, so that the signal after will processing adopts frequency mixer and filter transmission again.
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| CN104301909A (en) * | 2014-05-05 | 2015-01-21 | 河南普世通信科技有限公司 | Indoor distribution system MIMO single cable covering method and system |
| WO2015070782A1 (en) * | 2013-11-13 | 2015-05-21 | 华为技术有限公司 | Indoor distribution system, local unit and remote unit |
| CN105491577A (en) * | 2016-01-22 | 2016-04-13 | 北京邮电大学 | Asymmetric single-double current hybrid indoor coverage system |
| CN105959019A (en) * | 2016-06-01 | 2016-09-21 | 中国电子科技集团公司第四十研究所 | Large-bandwidth communication signal receiving and analyzing device and method based on dual-channel phase superposition |
| WO2018095294A1 (en) * | 2016-11-22 | 2018-05-31 | 深圳市道通智能航空技术有限公司 | Wireless communication system and unmanned aerial vehicle system using wireless communication system |
| CN113965169A (en) * | 2021-12-22 | 2022-01-21 | 中国移动通信有限公司研究院 | Frequency conversion method, device and system |
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