CN1852059A - Free-space optical transmission mobile communication digital peater - Google Patents
Free-space optical transmission mobile communication digital peater Download PDFInfo
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- CN1852059A CN1852059A CNA2006100355432A CN200610035543A CN1852059A CN 1852059 A CN1852059 A CN 1852059A CN A2006100355432 A CNA2006100355432 A CN A2006100355432A CN 200610035543 A CN200610035543 A CN 200610035543A CN 1852059 A CN1852059 A CN 1852059A
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Abstract
This invention relates to a free space light transmission mobile communication digital repeater, which converts the signals from the base station of the near end to IF or baseband signals in the down direction to be converted to digital baseband signals by a digit process unit and packed according to a suitable frame format then transmitted to a radio optical T-R unit to be output to the far end, which converts the received optical signals to electric signals to be de-framed by the digit process unit and converted to baseband or IF signals then to be converted to RF signals to be emitted by a RF unit and the up direction operation is opposite to the down process.
Description
[technical field]
The present invention relates to a kind of Mobile communication direct base station that adopts new signal processing mode, especially a kind of free-space optical transmission mobile communication digital peater.
[technical background]
Free space optical (Free Space Optical is called for short FSO) communication system is the communication system of wireless point-to-point, and it realizes transmitting and receiving of signal through laser beam.Laser transmission only needs very narrow beam path, any potential eavesdropping all can cause the interruption of Network Transmission, and the laser beam that exists can not found by spectroanalysis instrument or radio frequency meter, so free space optical communication has good fail safe and stronger confidentiality.In addition, it does not take other frequency resource, need not frequency spectrum licences, can lay network fast, reduces the networking expense.
Chinese patent ZL200310111361.5 discloses a kind of free-space optical transmission mobile communication interrupt system, it combines free space optical communication FSO technology and mobile communication relaying technique, give full play to the characteristics of two kinds of technology, product can be widely used in the mobile communications network networking and the network optimization.This system's proximal device is with mobile communication downlink signal RF signal, be modulated on the infrared laser signal and launch, after remote equipment receives the infrared laser signal, change it into mobile communications network signal, can easily network signal be expanded to the mobile communication blind area, solve the mobile communication covering problem.The up direction principle is identical with the down direction principle.Employing FSO technology realizes the transmission between the nearly far-end of mobile communication relay system, shortcomings such as wire transmission cost height, long construction period, difficult wiring both can have been avoided, also can eradicate the wireless restricted problem that defeated repeater construction and installation are subjected to isolation between transmitting and receiving antenna that keeps pouring in together, need the outer limited wireless frequency spectrum resource of occupying volume in the time of can avoiding wireless alien frequencies to transmit again.
Facts have proved that technique scheme makes up in the FSO repeater that forms, because the transmission of its signal adopts simulated mode to realize, therefore, be subjected to the influence of analog signal, its performance can descend with the deterioration of optical link.
[summary of the invention]
Purpose of the present invention will overcome above-mentioned the deficiencies in the prior art exactly, provides a kind of by caused behind the signal digital, has the free-space optical transmission mobile communication digital peater of superior performance.
The objective of the invention is to be achieved through the following technical solutions:
Free-space optical transmission mobile communication digital peater of the present invention comprises proximal device and remote equipment,
At down direction:
Near-end is from obtaining the mobile communications network signal by electric coupling in the air or directly from the base station, be down-converted to intermediate frequency or baseband signal by the near-end radio frequency unit, be treated to send into behind the digital baseband signal through the near-end digital processing element again and launch after near-end wireless optical Transmit-Receive Unit is converted to light signal;
The wireless optical Transmit-Receive Unit of far-end becomes the light signal of receiving into the signal of telecommunication, after process remote digital processing unit processes is base band or intermediate-freuqncy signal again, launches after the process remote radio unit (RRU) is converted to radiofrequency signal, reaches the purpose of covering;
Near-end wireless optical Transmit-Receive Unit and far-end wireless optical Transmit-Receive Unit are looked logical by free space optical;
At up direction:
From the signal of portable terminal, after the wireless optical Transmit-Receive Unit reception by far-end, send back the base station by path again with the down direction contrary.
Furthermore, mainly signal is carried out following processing in the digital processing element:
In the down direction:
If the near-end radio frequency unit is with after changing to analog if signal under the signal that is obtained, the A/D converter of input near-end digital processing element, it is transformed to digital medium-frequency signal, extract then, Digital Down Convert DDC such as filtering handles, finish frequency translation for the second time, make the carrier frequency of digital medium-frequency signal further reduce also and then become baseband signal, this baseband signal and then it is packaged into the data that are fit to certain frame format by the 8B/10B conversion module, these data export described near-end wireless optical Transmit-Receive Unit to;
In far-end, the 8B/10B conversion module that the signal of wireless optical Transmit-Receive Unit is sent to far-end is converted to digital intermediate frequency signal with baseband signal by Digital Up Convert DUC such as filtering, interpolation operation after signal is separated frame, carry out conversion and after The disposal of gentle filter, digital intermediate frequency signal is converted to analog intermediate frequency signal by D/A again, be delivered to described remote radio unit (RRU) at last;
The course of work of up direction is the inverse process of the above-mentioned down direction course of work.
Perhaps, radio frequency unit is also finished the conversion of radiofrequency signal to baseband signal when processing signals, and its detailed process is as follows:
In the down direction:
After the near-end radio frequency unit is down-converted to baseband signal with the signal that is obtained, the A/D converter of input near-end digital processing element, it is transformed to digital baseband signal, by the 8B/10B conversion module it is packaged into the data of certain frame format then, these data export described near-end wireless optical Transmit-Receive Unit to;
In far-end, the 8B/10B conversion module that the signal of wireless optical Transmit-Receive Unit is sent to far-end carries out conversion and after The disposal of gentle filter digital baseband signal is converted to analog baseband signal by D/A then, and being delivered to described remote radio unit (RRU) Direct Transform at last is to send after the radiofrequency signal;
The course of work of up direction is the inverse process of the above-mentioned down direction course of work.
Described frame format is chosen as CPRI or OBSAI frame format, but is not limited to this two kinds of forms again, also can design according to concrete needs.
The optics decision that the wireless optical signal wavelength is selected for use by the wireless optical Transmit-Receive Unit is chosen as 758nm, 850nm, and 980nm, 1310nm or 1550nm, but be not limited to this several values.
This repeater is operated in the main frequency range of China Mobile, comprises GSM, CDMA, CDMA2000, WCDMA and TD-SCDMA etc.
Compared with prior art, the invention has the advantages that: after signal was carried out digitized processing, the performance of system can not descend with optical path loss, can keep gain preferably, thereby guaranteed transmitting power and coverage; In addition, the wireless optical Transmit-Receive Unit that given figure type families system is adopted has high sensitivity, has reduced the luminous power shake and the decay of FSO transmission.
[description of drawings]
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is the theory diagram of Fig. 1 relay part digital signal processing module;
Fig. 3 is the theory diagram of Fig. 1 capped end part digital signal processing module;
[embodiment]
The present invention is further illustrated below in conjunction with drawings and Examples:
Please in conjunction with Fig. 1 to Fig. 3, free-space optical transmission mobile communication digital peater of the present invention comprises proximal device and remote equipment,
At down direction:
Near-end is from obtaining the mobile communications network signal by electric coupling from base station BTS in the air or directly, be down-converted to intermediate frequency or baseband signal by the near-end radio frequency unit, be treated to through the near-end digital processing element again and send into near-end wireless optical Transmit-Receive Unit behind the digital baseband signal and be converted to light signal and launch;
The wireless optical Transmit-Receive Unit of far-end becomes the light signal of receiving into the signal of telecommunication, after process remote digital processing unit processes is base band or intermediate-freuqncy signal again, launches after the process remote radio unit (RRU) is converted to radiofrequency signal, reaches the purpose of covering;
Near-end wireless optical Transmit-Receive Unit and far-end wireless optical Transmit-Receive Unit are looked logical by free space optical;
At up direction:
From the signal of portable terminal, after the free space optical communication transmission equipment reception by far-end, send back the base station by path again with the down direction contrary.
Furthermore, mainly signal is carried out following processing in the digital processing element:
In the down direction:
As Fig. 2, the near-end radio frequency unit is with after changing to analog if signal under the signal that is obtained, the A/D converter of input near-end digital processing element, it is transformed to digital medium-frequency signal, extract then, DDC such as filtering handles, finish frequency translation for the second time, the carrier frequency of digital medium-frequency signal is further reduced and and then become baseband signal, this digital baseband signal and then by the 8B/10B conversion module it is packaged into suitable frame format data and exports described near-end wireless optical Transmit-Receive Unit to;
In far-end, after receiving the near-end light signal and being converted to the signal of telecommunication, it is digital medium-frequency signal that the 8B/10B conversion module of delivering to far-end is separated behind the frame then by DUC treatment conversion such as filtering, interpolation, carry out conversion and after The disposal of gentle filter, digital intermediate frequency signal is converted to analog intermediate frequency signal by D/A again, be delivered to described remote radio unit (RRU) at last;
The course of work of up direction is the inverse process of the above-mentioned down direction course of work.
Perhaps, radio frequency unit also can simply carry out single-conversion when processing signals, finish the conversion of radiofrequency signal to baseband signal, and its detailed process is as follows:
In the down direction:
After the near-end radio frequency unit is direct down-conversion-to baseband signal with the signal that is obtained, the A/D converter of input near-end digital processing element, do not need this moment to select to use DDC to handle, only need directly by the 8B/10B conversion module it to be packaged into suitable frame format data, these data export described near-end wireless optical Transmit-Receive Unit to;
In far-end, the wireless optical Transmit-Receive Unit is converted to the 8B/10B conversion module of delivering to far-end behind the signal of telecommunication with light signal to carry out conversion and after The disposal of gentle filter digital baseband signal is converted to analog baseband signal by D/A then, is delivered to the direct up-conversion of described remote radio unit (RRU) at last to radiofrequency signal and launch;
The course of work of up direction is the inverse process of the above-mentioned down direction course of work.
Furthermore, mainly signal is carried out following processing in the wireless optical Transmit-Receive Unit:
In the down direction:
Near-end digital processing element output digital baseband signal, enter the wireless optical Transmit-Receive Unit and be converted to light signal by optical transceiving device, can select to use optical amplifier so that improve signal dynamics according to actual conditions, be convenient to far-end and receive, if the power of signal own enough then can not use optical amplifier and directly by the free space optical communication transmission equipment light signal is launched;
The free space optical communication transmission equipment receives the near-end light signal in the far-end wireless optical Transmit-Receive Unit, by optical transceiving device light signal is converted to the signal of telecommunication again, sends into digital processing element and is further processed;
The course of work of up direction is the inverse process of the above-mentioned down direction course of work.
In the down direction:
Perhaps the near-end digital processing element is exported digital baseband signal, directly the signal of telecommunication is given the free space optical communication transmission equipment, is light signal by the free space optical communication transmission equipment with electrical signal conversion, can select to carry out light amplification according to actual conditions handles so that improve signal dynamics, be convenient to far-end and receive, light signal is launched by the free space optical communication transmission equipment;
After the free space optical communication transmission equipment receives the near-end light signal in the far-end wireless optical Transmit-Receive Unit, light signal is converted to the signal of telecommunication, sends into digital processing element and further process;
The course of work of up direction is the inverse process of the above-mentioned down direction course of work.
The present invention is operated in the main frequency range of China Mobile, comprises GSM, CDMA, CDMA2000, WCDMA and TD-SCDMA etc.
This shows, after by digital processing element signal being carried out digitized processing, the performance of free space optical mobile digital of the present invention repeater can not descended with optical path loss, can keep good gain, thereby guarantee transmitting power and coverage, overcome the shortcoming that the performance of in the past simulating the FSO repeater descends with the deterioration of optical link.And, the also corresponding raising of its adaptive capacity to new standard.
Claims (10)
1, a kind of free-space optical transmission mobile communication digital peater comprises proximal device and remote equipment, it is characterized in that:
At down direction:
Near-end obtains the mobile communications network signal from the base station, be down-converted to intermediate frequency or baseband signal by the near-end radio frequency unit, be treated to through the near-end digital processing element again and be packaged into suitable frame format behind the digital baseband signal and send into near-end wireless optical Transmit-Receive Unit and be converted to light signal and launch;
The light signal that the wireless optical Transmit-Receive Unit of far-end receives near-end also converts the signal of telecommunication to, after separating frame and be base band or intermediate-freuqncy signal through the remote digital processing unit, launches after being converted to radiofrequency signal through remote radio unit (RRU), reaches the purpose of covering;
Near-end wireless optical Transmit-Receive Unit and far-end wireless optical Transmit-Receive Unit are looked logical by free space optical;
At up direction:
From the signal of portable terminal, after the wireless optical Transmit-Receive Unit reception by far-end, send back the base station by path again with the down direction contrary.
2, free-space optical transmission mobile communication digital peater according to claim 1 is characterized in that:
In the down direction:
The near-end radio frequency unit carries out the frequency translation first time with the signal that is obtained, make it be down-converted to analog if signal or baseband signal, then need it to be transformed to digital medium-frequency signal if be converted to analog if signal by A/D converter, extract then, Filtering Processing, finish frequency translation for the second time, make the carrier frequency of digital medium-frequency signal further reduce also and then become baseband signal, then it is transformed to digital baseband signal if be converted to baseband signal through A/D converter, so digital baseband signal and then form the data-signal of suitable protocol frame structure with the network management monitoring signal carries out error detection by the 8B/10B transducer then, remove direct current, export described near-end wireless optical Transmit-Receive Unit behind the coding to;
In far-end, light signal is converted to be separated frame behind the signal of telecommunication and isolates digital baseband signal and network management monitoring signal, digital baseband signal is converted to digital intermediate frequency signal by frequency up-conversion operation such as filtering, interpolation, carry out conversion and after The disposal of gentle filter, digital intermediate frequency signal is converted to analog intermediate frequency signal by D/A again, perhaps directly digital baseband signal is carried out conversion and after The disposal of gentle filter digital baseband signal is converted to analog baseband signal by D/A, be delivered to described remote radio unit (RRU) at last and be converted to radiofrequency signal;
The course of work of up direction is the inverse process of the above-mentioned down direction course of work.
3, free-space optical transmission mobile communication digital peater according to claim 2 is characterized in that:
Mainly signal is carried out following processing in the wireless optical Transmit-Receive Unit:
In the down direction:
Near-end digital processing element output digital baseband signal, enter the wireless optical Transmit-Receive Unit and be converted to light signal by optical transceiving device, can select to use optical amplifier so that improve signal dynamics according to actual conditions, be convenient to far-end and receive, if the power of signal own enough then can not use optical amplifier and directly by the free space optical communication transmission equipment light signal is launched;
The free space optical communication transmission equipment receives the near-end light signal in the far-end wireless optical Transmit-Receive Unit, by optical transceiving device light signal is converted to the signal of telecommunication again, sends into digital processing element and is further processed;
The course of work of up direction is the inverse process of the above-mentioned down direction course of work.
4, free-space optical transmission mobile communication digital peater according to claim 2 is characterized in that:
Mainly signal is carried out following processing in the wireless optical Transmit-Receive Unit:
In the down direction:
Near-end digital processing element output digital baseband signal, directly the signal of telecommunication is given the free space optical communication transmission equipment, is light signal by the free space optical communication transmission equipment with electrical signal conversion, can select to carry out light amplification according to actual conditions handles so that improve signal dynamics, be convenient to far-end and receive, light signal is launched by the free space optical communication transmission equipment;
After the free space optical communication transmission equipment receives the near-end light signal in the far-end wireless optical Transmit-Receive Unit, light signal is converted to the signal of telecommunication, sends into digital processing element and further process;
The course of work of up direction is the inverse process of the above-mentioned down direction course of work.
5, according to any described free-space optical transmission mobile communication digital peater in the claim 1 to 4, it is characterized in that: the optics decision that the wireless optical signal wavelength is selected for use by the wireless optical Transmit-Receive Unit is chosen as 758nm, 850nm, 980nm, 1310nm or 1550nm.
6, according to any described free-space optical transmission mobile communication digital peater in the claim 1 to 4, it is characterized in that: described frame format is chosen as CPRI or OBSAI frame format.
7, free-space optical transmission mobile communication digital peater according to claim 5 is characterized in that: described frame format is chosen as CPRI or OBSAI frame format.
8, according to any described free-space optical transmission mobile communication digital peater in the claim 1 to 4, it is characterized in that: this repeater is operated in the main frequency range of China Mobile, comprises GSM, CDMA, CDMA2000, WCDMA and TD-SCDMA etc.
9, free-space optical transmission mobile communication digital peater according to claim 6 is characterized in that: this repeater is operated in the main frequency range of China Mobile, comprises GSM, CDMA, CDMA2000, WCDMA and TD-SCDMA etc.
10, free-space optical transmission mobile communication digital peater according to claim 7 is characterized in that: this repeater is operated in the main frequency range of China Mobile, comprises GSM, CDMA, CDMA2000, WCDMA and TD-SCDMA etc.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006100355432A CN1852059A (en) | 2006-05-22 | 2006-05-22 | Free-space optical transmission mobile communication digital peater |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101534382B (en) * | 2009-04-21 | 2011-04-20 | 珠海无线蜂网科技有限公司 | Method, system and device for RF synchronous transmitting broadcast television signal |
| CN102932071A (en) * | 2011-08-10 | 2013-02-13 | 京信通信系统（中国）有限公司 | Offline isolation detection method for digital repeater |
| CN108028696A (en) * | 2015-04-30 | 2018-05-11 | 株式会社秀利得 | Satellite-signal relay system |
-
2006
- 2006-05-22 CN CNA2006100355432A patent/CN1852059A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101534382B (en) * | 2009-04-21 | 2011-04-20 | 珠海无线蜂网科技有限公司 | Method, system and device for RF synchronous transmitting broadcast television signal |
| CN102932071A (en) * | 2011-08-10 | 2013-02-13 | 京信通信系统（中国）有限公司 | Offline isolation detection method for digital repeater |
| CN102932071B (en) * | 2011-08-10 | 2015-02-11 | 京信通信系统（中国）有限公司 | Offline isolation detection method for digital repeater |
| CN108028696A (en) * | 2015-04-30 | 2018-05-11 | 株式会社秀利得 | Satellite-signal relay system |
| CN108028696B (en) * | 2015-04-30 | 2021-01-15 | 株式会社秀利得 | Satellite signal relay system |
| US11438060B2 (en) | 2015-04-30 | 2022-09-06 | Solid, Inc. | Satellite signal relay system |
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Open date: 20061025 |