CN1812291A - Radio communication system based on optical signal processing - Google Patents
Radio communication system based on optical signal processing Download PDFInfo
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- CN1812291A CN1812291A CN 200510002916 CN200510002916A CN1812291A CN 1812291 A CN1812291 A CN 1812291A CN 200510002916 CN200510002916 CN 200510002916 CN 200510002916 A CN200510002916 A CN 200510002916A CN 1812291 A CN1812291 A CN 1812291A
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Abstract
This invention discloses a kind of wireless communication system based on optical signal processing. It concludes the controlling station and base station. The controlling station concludes the optical signal processing element and demodulated optical signal processing element. The controlling station concludes the transmitter and receiver. The transmitter concludes the optical signal processing element: current-to-light inversion module, optical modulation module, light band pass filter and light-to-current inversion module. They are successively connected through light waveguide; the receiver concludes the demodulated optical signal processing element: light-to-current inversion module, light demodulation module, light equalizer and current-to-light inversion module. They are also successively connected through light waveguide; the transmitter and receiver are connected with base station through the light-to-current inversion module and the current-to-light inversion module respectively. The optical signal processing technology can increase network capacity. The fibre-optical group network base station non-radio frequency technology can make the network frame simple and decrease the cost.
Description
Technical field
The present invention relates to a kind of wireless communication system, relate in particular to a kind of wireless communication system of handling based on light signal.
Background technology
Present wireless communication system has developed into a quite high level, becomes a comparative maturity and perfect system.But the bottleneck that limits it now is some problems of wireless system itself, and low as the wireless communication system carrier frequency, band efficiency is low, and signal of telecommunication processing speed is slow, the electric capacity magnetic problem or the like of holding concurrently.See current main several communications again: the centre carrier frequency of wireless lan (wlan) is 5GHz, and corresponding transmission rate is the 10Mbps magnitude; The centre carrier frequency of gsm system is 1Ghz, and corresponding transmission rate is the Mbps magnitude; The centre carrier frequency of up-to-date 3G network (as WCDMA) also is the GHz magnitude, and transmission speed is the Mbps magnitude.More than the network capacity of three kinds of wireless communication systems all extremely limited.These just become the main resistance that the restriction radio communication service continues development.
Summary of the invention
At the existing problem and shortage of above-mentioned existing wireless communications system, the purpose of this invention is to provide a kind of long transmission distance, network capacity and reach the bigger wireless communication system of coverage greatly based on the light signal processing.
The present invention is achieved in that a kind of wireless communication system of handling based on light signal, includes control station and base station, and described control station includes the light signal processing unit and conciliates the light signal processing unit.
Further, described control station comprises transmitter and receiver, and described transmitter includes described light signal processing unit: electro-optical conversion module, optical modulator module, optical band pass filter and light-to-current inversion module, and it connects by fiber waveguide successively; Described receiver includes the described light signal processing unit of separating: light-to-current inversion module, optical modulator module, Optical Equalizer and electro-optical conversion module, and it connects by fiber waveguide successively; Described transmitter and receiver is connected with the base station with the electro-optical conversion module by the light-to-current inversion module respectively.
Further, described transmitter also comprises the light interleaving block, and this light interleaving block is connected between electro-optical conversion module and the optical modulator module; Described receiver comprises separates the light interleaving block, and this is separated the light interleaving block and is connected between light-to-current inversion module and the optical modulator module.
Further, described smooth interleaving block comprises optical waveguides amplifier, beam splitter, delayer, semiconductor optical amplifier and coupler, optical waveguides amplifier amplifies light signal, beam splitter evenly is divided into the several signals identical with original signal with this amplifying signal, each signal through the beam splitter beam splitting is input to each coupler after the delayer time-delay, in coupler, each signal after the time-delay is coupled with the coupling pulse of outside input, transport to semiconductor optical amplifier after the coupling respectively, coupling output again after time-delay; Described reflective interleaving block correspondence comprises optical waveguides amplifier, beam splitter, delayer, semiconductor optical amplifier and coupler, and just the symbol transformations order is just in time opposite, and each time-delay is different.
Further, can be divided into different bundle numbers according to the code element feature when described beam splitter carries out beam splitting to light signal, the cycle of the coupling pulse of outside input, pulse mode are also different.
Further, the adjustment modes of described optical modulator module is quaternary PSK (QPSK) mode.
Further, described receiver also comprises the optical channel estimation module, and its input receives transmitting of base station, carries out session and estimates, exports Optical Equalizer to.
Further, described transmitter also includes light inverse FFT (IFFT) module, and its input is connected with optical modulator module, and output is connected with optical band pass filter; Described receiver includes light fast Fourier transform (FFT) module, and its input is connected with Optical Equalizer, and output is connected with the optical modulator module.
Further, can be respectively arranged with optical waveguides amplifier, beam splitter on the described optical band pass filter, carry out beam splitting again after light signal is amplified, utilize Optical Fiber Transmission to arrive each base station each beam splitting light.
Further, described fiber waveguide is specially optical fiber.
The present invention proposes a kind of wireless communication system, handle and the characteristic of Optical Fiber Transmission distance communicates the design of system and networking, greatly improved network capacity, and had great coverage by light signal in conjunction with Fibre Optical Communication Technology.This can well solve the deficiency of the capacity of prior wireless network, for example the centre carrier frequency of WLAN (wireless local area network) and Cellular Networks generally is the GHz magnitude, corresponding transmission rate is the Mbps magnitude, the novel wireless communication system that combines Fibre Optical Communication Technology that the present invention proposes, because utilizing light signal handles and transmits, its carrier frequency improves (tens GHz even THz magnitude) greatly, transmission rate can reach more than the Gbps, network capacity improves greatly, so just can support more user.It is simple that the present invention designs networking, only needs a control station and some base stations (comprising photoelectricity carrier transformation and antenna) just can cover great scope.Of the present invention have two big characteristics, and the one, the light signal treatment technology, the 2nd, optical fiber networking base station does not have radio-frequency technique.The former can improve network capacity, and the latter can make network architecture oversimplify, and reduces cost.
Description of drawings
Below in conjunction with accompanying drawing the present invention is illustrated in further detail:
Fig. 1 is an overall structure schematic diagram of the present invention;
Fig. 2 is the structural representation of a special case of the present invention;
Fig. 3 is the square weaving diagram that the present invention is an example with 16 signals;
Fig. 4 is Fig. 2 light signal square implementation structure schematic diagram that interweaves;
Fig. 5 is another structural representation that light signal square of the present invention interweaves and realizes;
Fig. 6 is the another structural representation that light signal square of the present invention interweaves and realizes;
Fig. 7 is second group of time-delay schematic diagram in Fig. 3 deinterleaving method.
Embodiment
As shown in Figure 1, 2, integral body of the present invention comprises control station (Radio StationCS) and base station (Radio BaseStation RBS) two parts, is the boundary with perpendicular dotted line among the figure, and left-hand component is control station, and right-hand component is the base station.Control station partly includes the light signal processing unit and conciliates the light signal processing unit.Wherein, control station comprises transmitter (top) and receiver (lower part).Transmitter includes traditional forward error correction coder and electrical modulation module, wherein, is electrically connected between forward error correction coder and the electrical modulation module.After the electrical modulation module of the present invention, be light signal, can utilize like this in the optical signal transmission that processing speed is fast, long transmission distance, fiber waveguide advantage capacious electrical signal conversion; The light signal processing unit of transmitter comprises electro-optical conversion module, light interleaving block, light QPSK modulation module, optical band pass filter and light-to-current inversion module successively, and it connects by optical fiber successively.Base station of the present invention includes smart antenna, does not comprise traditional radio-frequency module.Directly launch after the light signal process light-to-current inversion module converts of the present invention by corresponding base station, because the signal that transmits in the optical fiber of the present invention has been the signal through light signal is handled and light carrier is modulated, this launches differently in the base station with traditional Optical Fiber Transmission baseband signal again through radio-frequency module modulation back by opto-electronic conversion, base station portion of the present invention does not need radio-frequency module.Transmitter is connected with the base station by the light-to-current inversion module.
Accordingly, the light signal processing unit of separating of receiver comprises electro-optical conversion module, Optical Equalizer, optical channel estimation module, light QPSK demodulation module, photodissociation interleaving block and light-to-current inversion module, receiver also comprises traditional electrolysis mode transfer piece and forward error correction decoder, wherein, electro-optical conversion module, Optical Equalizer, light QPSK demodulation module, photodissociation interleaving block are connected by optical fiber successively with the light-to-current inversion module, the signal that optical channel estimation module one termination is received the wireless channel emission carries out inputing to Optical Equalizer after the channel estimating; Be electrically connected between electrolysis mode transfer piece and the forward error correction decoder; Receiver is by the wireless channel received signal, through after the conversion of electro-optical conversion module with optical signal transmission.Receiver is connected with the wireless channel of base station by receiver module.
For improving signal quality, transmitter of the present invention also comprises light inverse FFT (IFFT) module, overcomes the multipath effect in the wireless channel.Its input is connected with light QPSK demodulation module optical fiber, and output is connected with optical band pass filter optical fiber; Its light signal to light QPSK demodulation module modulation carries out being input to optical band pass filter after the anti-fast Fourier transform and carries out filtering.Accordingly, receiver also comprises light fast Fourier transform (FFT) module, and optical fiber is connected between its input and the Optical Equalizer, and output is connected with light QPSK demodulation module.
The present invention comes transmission signals by optical fiber, because the Optical Fiber Transmission distance, the decay little, the base station can be put into from the far place of control station, like this, the wireless signal that launch the base station can non-overlapping copies and influence on the region, can not launch the signal of same frequency so mutually mutually in sub-districts of influence at these, so that band resource utilizes fully efficiently, Here it is so-called co-frequency cell, thus the present situation of wireless network medium frequency inadequate resource solved.In addition, because Optical Fiber Transmission transmits, can connect fiber amplifier and beam splitter successively at the light signal delivery outlet, like this, can at first light signal be amplified N (N is the natural number greater than 2) doubly, with beam splitter light signal is divided into the N bundle signal identical with original signal again, like this, signal after can utilizing optical fiber with these beam splitting outputs to other base stations, and is very convenient quick.
In addition, more reliable for communication quality, the present invention has adopted the light interleaving block.The effect that light interweaves in radio communication changes original sequence order exactly according to ad hoc fashion, be used for resisting the continuous channel decline in the channel, makes the interference of its minimizing to channel-decoding (for example Viterbi decoder).Here, the light interleaving technology that the present invention mentioned is the wireless meaning that interweaves, and is interweaving of symbol, and is different fully in the effect that the optical-fiber network medium wavelength interweaves with original light interleaver.It comprises that square interweaves, convolutional interleave etc.It is example that the present invention interweaves with square, is given in the way that realizes in the light signal processing.
Sequence with 16 sign indicating numbers is an example below, analyzes the principle of optical signal interleaver, and is as follows:
The present invention uses for reference the light signal of Optical Time Division Multiplexing Technology (OTDM) and handles the realization above-mentioned functions.Theory diagram as shown in Figure 4.The principle of light interleaving block of the present invention is signal to be amplified (to guarantee that the back signal energy is constant along separate routes) by erbium-doped fiber amplifier (EDFA) earlier, use beam splitter (splitter) that signal evenly is divided into the N road then, delay unit (among the figure be example with 4 tunnel) is passed through on the N road respectively.After the coupling pulse modulation, be output as N road signal, utilize coupler (coupler) and semiconductor optical amplifier (SOA) to take out (being equivalent to the optical switch effect) respectively N signal, and then this N road signal is exported successively through calculating good time-delay, reach the purpose that interweaves.Be example also, realization principle of the present invention is described with 16 signals among Fig. 3.Shu Ru a 1-16 signal is divided into 4 bundles earlier by image intensifer (constant with luminous power after guaranteeing beam splitting), and then by beam splitter in order, and every bundle all is duplicating fully of list entries.Four intrafascicular first bundles directly with coupling pulsion phase AND-operation, promptly select the 1st, 5 by coupler and SOA, 9,13 signal not by fiber delay time.The pulse that wherein is coupled is the continuous impulse sequence every one of 4 code-element period.The four second intrafascicular time-delays of restrainting through a code-element period then by coupler and SOA, select the 4th, 8,12,16 signals by the coupling pulse.Three beams in the Four Books and the 4th bundle postpone two and three code-element periods respectively, by coupler and SOA, select the 3rd, 7 again, 11,15 and the 2nd, 6, the signal of every row in 10,14 signals, Here it is Fig. 3 matrix, if allow this four bundle successively output be exactly the desired result of interweaving.And then respectively time-delay successively output just reached the purpose that the code element square interweaves, as shown in Figure 7, be second group of time-delay interlaced code meta structure, 0,44,28,12 code-element periods of delaying time respectively.
As shown in Figure 5, another light interleaving block structure of the present invention is identical with Fig. 4 structure, and the time-delay of the coupling pulse period of outside input, pulse mode difference, each passage is also different.The outside of structure input coupling pulse is pulse modes of per 4 code-element periods as shown in Figure 4, and the outside input coupling pulse of structure shown in Figure 5 is continuous 4 pulse modes of per 16 code-element periods.
As shown in Figure 6, another light interleaving block structure of the present invention and Fig. 4,5 structures are basic identical.It is divided into 16 the tunnel with beam splitter with light, utilizes coupler (coupler) and semiconductor optical amplifier (SOA) to take out respectively 16 signals, and this moment, the coupling pulse of input was one of per 16 code-element period.Every then road postpones the corresponding time, and the time-delay of 16 road signals is respectively: 0,1,2,3,4,5,6,7,8,9,10,11,12, in 13,14,15, the second time-delay groups, the time-delay of 16 road signals is respectively 15,14,10,6,2,13,9,5,1,12,8,4,0,11,7,3.According to theory output order output sequence, this effect just is equivalent to optical switch to be selected, and just optical switch traditionally is to select different wave length, and is to select different code elements here.This way signal rate is constant, but resource consumption big (having used more coupler and SOA), and total time-delay is also very big.
As shown in the table, be above three kinds of deinterleaving methods comparison sheet as a result:
| Coupling pulse spacing A | Time- | Time- | Time- | Time- | Time- | Time- | Time- | Time- | Splitter is number N along separate routes | Speed | Resource | Time- | |
| Method | |||||||||||||
| 1 | 4 | 0 | 1 | 2 | 3 | 0 | 44 | 28 | 12 | 4 | 1/4 | Few | |
| Method | |||||||||||||
| 2 | 1 | 0 | 4 | 8 | 12 | 0 | 1 | 2 | 3 | 4 | 4 | Few | Few |
| Method 3 | - | - | - | - | - | - | - | - | - | 16 | Constant | Many | Greatly |
Similarly, also comprise deinterleaving in the receiver of the present invention, it is the inverse process of interleaving process, and implementation method and interleaving process principle are basic identical, and just the symbol transformations order is different, and time-delay is different.
The present invention is an example with the situation of the sequence of 16 sign indicating numbers only, and other situations can realize with the method equally.
Digital baseband signal of the present invention becomes electrical modulation signal later on by electrical modulation, be converted to light amplitude modulation signal (RZ sign indicating number) through light-to-current inversion then, again the light signal of this moment is handled, carry out promptly that light interweaves, light QPSK modulates (if ofdm system can carry out light IFFT conversion after this) and light belt pass filter.Carrying out these light signals processing is in order to make signal resist the deficiency of wireless channel in radio-frequency transmissions, as decline, multipath effect etc., for that part of service of wireless transmission, to guarantee that distorted signals is as far as possible little.Be the signal processing of a control station more than, the light signal after the processing can detect the light envelope through Photoelectric Detection, and promptly electrical modulation signal (radiofrequency signal) by smart antenna, is launched in this sub-district.Wherein, smart antenna can scan by optical characteristics, adds fast scan speed.When received signal, adopt the method just opposite to get final product with radiating portion, be that many optical channels are estimated and Optical Equalizer when light signal is handled.
The present invention also can realize by another structure.In the system as shown in Figure 2, can remove the electrical modulation module.Wireless communication system of the present invention can carry out at Quan Guangzhong, promptly so-called full optical processing.If the electrical modulation module is removed, then can reach this imagination.At this moment, owing to do not pass through electrical modulation, can not come detected envelope by simple light-to-current inversion module in the base station, realization is from the conversion of light modulation frequency to the electrical modulation frequency, and can only finish by the way of similar frequency conversion, for example, (differing from tens GHz or hundreds of GHz) the single-frequency pump light that is close with the flashlight frequency can added, then two-beam is carried out difference frequency, receiving the wave band (tens GHz or hundreds of GHz) that difference frequency signal can obtain being fit to radio-frequency transmissions by Photonic Detector (PD) again, can be millimeter wave band here.This is noted that wherein two bundles want the light of difference frequency that good synchronism will be arranged, and could guarantee the stability of the signal behind the difference frequency, and the detection frequency of PD is also consistent just passable with the frequency of signal after the beat.Again for example, can produce the frequency range that is fit to emission by the light four-wave mixing effect, as millimeter wave band.Four wave mixing is used for wavelength conversion comparative maturity, realize that with the four wave mixing beat low frequency also is present up-and-coming direction, and four wave mixing can also improve the problem of millimeter wave chromatic dispersion.The filter of some high-frequency microwave wave bands designs.And millimeter wave filter also can be by Mach-increase the Dare modulator to realize, some devices of we can say millimeter are comparative maturity.These have all guaranteed the feasibility that this module realizes.And all the other functions of modules and effect do not change.
Light signal of the present invention is the signal after ovennodulation, only is that light signal transmits by optical fiber with its simple conversion, and this has just solved the problem that conversion speed is slow in the radio communication, capacity is low; Owing to the effect of Optical Fiber Transmission distance, each base station is without any need for radio-frequency apparatus simultaneously, and the advantage that radio-frequency module is only finished at control station just can solve the radio wave radio frequency unit because the problems such as Electro Magnetic Compatibility that radio-frequency module brought.The present invention meanwhile can also change the communication structure of existing Cellular Networks fully, solves the present situation of its frequency resource deficiency.The present invention has greatly improved bit rate, has increased capacity, band resource utilance height.Because signal utilizes the fiber-optic transmission rate can about soon 3 orders of magnitude with respect to existing wireless communication system, the processing speed of wireless communication system of the present invention just can improve greatly, thereby solve the bottleneck of existing wireless network---capacity problem, increase the kind and the quality of service.Again owing to connection by optical fiber, the base station can be put into from the far place of control station, like this, the wireless signal that launch the base station can non-overlapping copies and influence on the region, in these sub-districts that do not influence mutually mutually, can launch the signal of same frequency so, so that band resource utilizes fully efficiently, Here it is so-called co-frequency cell, thus solve the present situation of wireless network medium frequency inadequate resource.Networking is extremely simple, and cost is low, sets up easily multiple access.Existing wireless communication system is in order to solve covering problem, generally to set up base station or repeater, be that every suit base station all needs signal modulation/demodulation modules and radio-frequency module and limit its subject matter of setting up, because the use that too high expense and electromagnetic interference have limited them.And if adopt the present invention's optical signal processing system shown in Figure 2, then simply can from " light-to-current inversion module " before with the light signal that modulates by Optical Fiber Transmission to each sub-district or module to be launched.Each module to be launched only needs a light-to-current inversion module and antenna to launch, and so just avoided radio-frequency module fully, thereby reduced electromagnetic interference, and more favourable place is to lay cost and it is easy to set up.The place of required covering only needs arbitrarily to introduce optical fiber and base station module gets final product.This cans be compared to all works of treatment and can finish at Centroid (CS), networking gets final product as draw a lot of antenna emissions from Centroid, so just existing cellular network architecture can be replaced with WLAN (wireless local area network) or other communication systems that has the center processing station fully.A following description of simplified example of its networking: inside, wireless base station (RBS) only possesses light-to-current inversion and antenna assembly gets final product, and the part that light signal is handled is all finished at control station.One of bottleneck of current radio communication is that radio-frequency module is difficult to design, if and wireless launcher can utilize light signal to handle realization, because it is carrier frequency at 14 powers of 10 that light signal is handled, original radio-frequency module (being modulated on the electric carrier wave) part just can be utilized the light-to-current inversion module, it plays the effect that optical carrier frequency is reduced to electric carrier wave, this is equivalent to the existing process that raises from intermediate frequency (IF) to radio frequency (RF) frequency is become the process that reduces from light carrier (extremely high frequency) to radio frequency (RF) frequency, so just can avoid radio frequency design fully, solve emc issue.
Claims (10)
1, a kind of wireless communication system of handling based on light signal includes control station and base station, and described control station includes the light signal processing unit and conciliates the light signal processing unit.
2, the wireless communication system of handling based on light signal as claimed in claim 1, it is characterized in that, described control station comprises transmitter and receiver, described transmitter includes described light signal processing unit: electro-optical conversion module, optical modulator module, optical band pass filter and light-to-current inversion module, and it connects by fiber waveguide successively; Described receiver includes the described light signal processing unit of separating: light-to-current inversion module, optical modulator module, Optical Equalizer and electro-optical conversion module, and it connects by fiber waveguide successively; Described transmitter and receiver is connected with the base station with the electro-optical conversion module by the light-to-current inversion module respectively.
3, the wireless communication system of handling based on light signal as claimed in claim 2 is characterized in that described transmitter also comprises the light interleaving block, and this light interleaving block is connected between electro-optical conversion module and the optical modulator module; Described receiver comprises separates the light interleaving block, and this is separated the light interleaving block and is connected between light-to-current inversion module and the optical modulator module.
4, light signal wireless communication system as claimed in claim 3, it is characterized in that, described smooth interleaving block comprises optical waveguides amplifier, beam splitter, delayer, semiconductor optical amplifier and coupler, optical waveguides amplifier amplifies light signal, beam splitter evenly is divided into the several signals identical with original signal with this amplifying signal, each signal through the beam splitter beam splitting is input to each coupler after the delayer time-delay, in coupler, each signal after the time-delay is coupled with the coupling pulse of outside input, transport to semiconductor optical amplifier after the coupling respectively, coupling output again after time-delay; Described smooth interleaving block correspondence comprises optical waveguides amplifier, beam splitter, delayer, semiconductor optical amplifier and coupler, and its principle and light interleaving block are basic identical.
5, the wireless communication system of handling based on light signal as claimed in claim 4 is characterized in that, can be divided into different bundle numbers according to the code element feature when described beam splitter carries out beam splitting to light signal, and the cycle of the coupling pulse of outside input, pulse mode are also different.
6, as the described wireless communication system of handling based on light signal of the arbitrary claim of claim 1 to 5, it is characterized in that the adjustment modes of described optical modulator module is quaternary PSK (QPSK) mode.
7, the wireless communication system of handling based on light signal as claimed in claim 6 is characterized in that described receiver also comprises the optical channel estimation module, and its input receives transmitting of base station, carries out session and estimates, exports Optical Equalizer to.
8, the wireless communication system of handling based on light signal as claimed in claim 6, it is characterized in that, described transmitter also includes light inverse FFT (IFFT) module, and its input is connected with optical modulator module, and output is connected with optical band pass filter; Described receiver includes light fast Fourier transform (FFT) module, and its input is connected with Optical Equalizer, and output is connected with the optical modulator module.
9, the wireless communication system of handling based on light signal as claimed in claim 6, it is characterized in that, can be respectively arranged with optical waveguides amplifier, beam splitter on the described optical band pass filter, carry out beam splitting again after light signal is amplified, utilize Optical Fiber Transmission to arrive each base station each beam splitting light.
10, the wireless communication system of handling based on light signal as claimed in claim 6 is characterized in that described fiber waveguide is specially optical fiber.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035601A (en) * | 2010-12-07 | 2011-04-27 | 北京邮电大学 | Method for improving transmission capacity of multimode fiber communication system |
| CN102946279A (en) * | 2012-12-03 | 2013-02-27 | 河南省电力公司郑州供电公司 | Radio signal based grounding access method of OPPC (Opticalphase Conductor) |
| CN102946277A (en) * | 2012-12-03 | 2013-02-27 | 河南省电力公司郑州供电公司 | Grounding access device of OPPC (Opticalphase Conductor) |
| CN103888398B (en) * | 2008-07-31 | 2017-05-10 | 爱立信电话股份有限公司 | Optical signal modulation |
| CN112152849A (en) * | 2020-09-21 | 2020-12-29 | 上海交通大学 | Base station based on intelligent all-optical processing and implementation method thereof |
-
2005
- 2005-01-26 CN CN 200510002916 patent/CN1812291A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103888398B (en) * | 2008-07-31 | 2017-05-10 | 爱立信电话股份有限公司 | Optical signal modulation |
| CN102035601A (en) * | 2010-12-07 | 2011-04-27 | 北京邮电大学 | Method for improving transmission capacity of multimode fiber communication system |
| CN102946279A (en) * | 2012-12-03 | 2013-02-27 | 河南省电力公司郑州供电公司 | Radio signal based grounding access method of OPPC (Opticalphase Conductor) |
| CN102946277A (en) * | 2012-12-03 | 2013-02-27 | 河南省电力公司郑州供电公司 | Grounding access device of OPPC (Opticalphase Conductor) |
| CN102946279B (en) * | 2012-12-03 | 2016-07-13 | 国网河南省电力公司郑州供电公司 | Method of network entry is landed based on the OPPC optical fiber of radio signal |
| CN102946277B (en) * | 2012-12-03 | 2016-08-03 | 国家电网公司 | OPPC optical fiber land networking device |
| CN112152849A (en) * | 2020-09-21 | 2020-12-29 | 上海交通大学 | Base station based on intelligent all-optical processing and implementation method thereof |
| CN112152849B (en) * | 2020-09-21 | 2022-03-08 | 上海交通大学 | Base station based on intelligent all-optical processing and implementation method thereof |
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