CN208986943U - Relay is combined in free space optical communication serial parallel - Google Patents
Relay is combined in free space optical communication serial parallel Download PDFInfo
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- CN208986943U CN208986943U CN201821739196.6U CN201821739196U CN208986943U CN 208986943 U CN208986943 U CN 208986943U CN 201821739196 U CN201821739196 U CN 201821739196U CN 208986943 U CN208986943 U CN 208986943U
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Abstract
The utility model discloses a kind of free space optical communication serial parallel to combine relay, it includes the parallel transmitting link road of M item, and each link is made of N number of serial AF relay node again；Wherein M, N are positive integer, and M >=2, N number of AF relay node is placed on transmitting terminal to the straight line of receiving end, and the straight line of transmitting terminal to receiving end is divided into N+1 equal portions.For the utility model designs purer serial repeated link or parallel relay link, the anti-atmospheric turbulance ability that communicates can be improved, and increase system channel capacity with the coverage area of further expansion signal；(DF) trunking scheme is forwarded relative to decoding, amplification forwarding (AF) can reduce cost while simplify the design of system, improve the flexibility of system design and be easy to practical.
Description
Technical field
The utility model relates to a kind of free space optical communication serial parallel to combine relay.
Background technique
Free space optical communication (Free Space Optical-Communication, FSO) is also referred to as atmospheric optical communication,
It is a kind of intercommunication system for propagating realization under atmospheric channel by laser signal in the case where not needing optical fiber, is recognized
To be the best feasible method for solving the problems, such as " last one kilometer ".It has low-power consumption, is not necessarily to frequency spectrum licences, high-transmission
Rate, the advantages such as at low cost, safety is good, can be simple and quick in complex situations establish high speed communications link, and resist
Interference performance is strong, so field involved in this technology is very extensive, can be used for space communication, military cause, the daily life of the people
Work is medium.However the FSO link of single-hop is limited by decline caused by atmospheric turbulance, communication distance is no more than several kms.For
Expand the coverage area of signal, we will use relaying technique.By introducing relaying technique, communication long link is broken down into more
The communication reliability of the short link of item, transmitted from transmitter to receiver can be promoted effectively.
Serial and concurrent two ways, Mohammadreza A. in 2013 etc. are divided into for the field FSO relay system link
Scholar provides theoretical foundation to the research of system break performance under two ways for the design of optical link.Multi-hop transmission is as one
The serial relay transmission scheme of kind and current research hotspot.The processing of FSO System relays node can use amplification forwarding
(AF) and decoding forwarding (DF) two ways, the communication reliability for decoding forwarding is high, but structure it is more complicated, it is at high cost, be difficult to
Realize, and cost is relatively low, structure is simple for amplification forwarding, wherein the system of AF mode to signal can by light amplification mode,
Also it may switch to electrical domain and amplify forwarding.
For in practical communication link design, it should in the light of actual conditions select serial trunking scheme and parallel relay side
Formula should not be limited to a kind of mode only with serial or parallel.The simultaneous communication system of serial parallel, which is only, more to be accorded with
It closes in practice.Currently, only being had studied simultaneously in Turkey scholar Sasan Zhalehpour and Murat Uysal in 2014
Row relays the performance of FSO system, contains the serial relaying of several decodings and forwarding again in each parallel relay link, utilizes
Path optimal selection agreement (m-bp) finds out the minimum link of outage probability, and used herein is BPPM technology, and compares BPPM
Technology can produce higher data rate using orthogonal frequency division multiplexing (OFDM) technology, can also effectively inhibit intersymbol
It interferes (ISI), because its resistance frequency selective fading and narrow-band noise ability are strong, higher band efficiency can be well
Inhibit random fading effect caused by atmospheric channel.
Utility model content
The purpose of this utility model is that being directed to existing deficiency, provide in a kind of free space optical communication serial parallel combination
After device.
The purpose of this utility model is achieved through the following technical solutions: a kind of free space optical communication serial parallel group
Relay is closed, it includes the parallel transmitting link road of M item, and each link is made of N number of serial AF relay node again；Wherein M, N
For positive integer, M >=2, N number of AF relay node is placed on transmitting terminal to the straight line of receiving end, by transmitting terminal to the straight of receiving end
Line is divided into N+1 equal portions.
Further, each relay node is by receiving end RXWith transmitting terminal TXComposition, the transmitting terminal TXIncluding successively phase
The first Butterworth LPF even, the first I/Q frequency mixer, the first bandpass filter, the modulation of lithium niobate Mach-Zehnder
Device, the first optical band pass filter and the first transmitting antenna；The lithium niobate Mach-Zehnder modulators are also connected with first laser
Device；The receiving end RXIncluding the second receiving antenna, magnitude amplifier, optical mixer unit, the second light belt pass filter being sequentially connected
Device, the second photodetector, the second bandpass filter, the 2nd I/Q frequency mixer and the second Butterworth LPF；Wherein,
Second laser is also connected on the optical mixer unit.
Further, the receiving end R in the relay nodeXWith transmitting terminal TXBetween by AF relay structure realize amplification
Forwarding, the AF relay structure include the first receiving antenna being sequentially connected, the first photodetector, Ge amplifier, electric light turn
Change circuit, the second transmitting antenna.
Further, the distance between two neighboring AF relay node is not more than a km.
The beneficial effects of the utility model are: this parallel relay and the composite structure that serially relays compared to simple and
Row relaying or serial relay structure, advantage is more obvious, can be increased system channel with the coverage area of further expansion signal and be held
Amount, while influence of the atmospheric turbulance to communication quality can significantly be reduced using coherent detection OFDM technology.AF relaying technique
Application but also the utility model structure is simple, system deployment more has flexibility, be easily achieved in real life.
Detailed description of the invention
Fig. 1 is the structural schematic block diagram of the utility model；
Fig. 2 is the transmitting terminal structural schematic block diagram of the utility model；
Fig. 3 is the amplification relay node structural schematic block diagram of the utility model；
The receiving end structural schematic block diagram of Fig. 4 the utility model；
In figure, the first Butterworth LPF 1, the first I/Q frequency mixer 2, the first bandpass filter 3, first laser
Device 4, lithium niobate Mach-Zehnder modulators 5, the first optical band pass filter 6, the first transmitting antenna 7, the first receiving antenna 8,
One photodetector 9, Ge amplifier 10, electro-optical conversion circuit 11, the second transmitting antenna 12, the second receiving antenna 13, amplitude are put
Big device 14, optical mixer unit 15, second laser 16, the second optical band pass filter 17, the second photodetector 18, the filter of the second band logical
Wave device 19, the 2nd I/Q frequency mixer 20, the second Butterworth LPF 21, Tx are transmitting terminal, RLFor AF relay node, Rx
For receiving end.
Specific embodiment
The utility model free space optical communication serial parallel combination relay include equipments overall structure shown in FIG. 1,
Transmitting end structure, AF relay node structure shown in Fig. 3 and reception end structure shown in Fig. 4 shown in Fig. 2.
The utility model is described further with reference to the accompanying drawing.
As shown in Figure 1, the utility model includes the parallel transmitting link road of M item, each link is again by N number of serial AF relaying section
Point composition；Wherein M, N are positive integer, and M >=2, N number of AF relay node is placed on transmitting terminal to the straight line of receiving end, will emit
The straight line to receiving end is held to be divided into N+1 equal portions.S indicates that source node, D indicate destination node, R11, R12..., R1N,…,RN1,
RN2,…,RNNIndicate relay node, each relay node is by receiving end RXWith transmitting terminal TXComposition.
As shown in Fig. 2, the transmitting terminal T of relay nodeXIncluding be sequentially connected electrically the first Butterworth LPF 1,
First I/Q frequency mixer 2, the first bandpass filter 3, lithium niobate Mach-Zehnder modulators 5, the first optical band pass filter 6,
One transmitting antenna 7, first laser device 4 and lithium niobate Mach-Zehnder modulators 5 are electrically connected.
By external OFDM modulators modulate at ofdm signal as original data signal, signal is fertile by the first Bart
This low-pass filter 1 filters high-frequency noise, then passes through 2 external high-frequency signal LO of the first I/Q frequency mixer1Ofdm signal is carried out
It is converted to a suitable intermediate frequency fLO1On.Signal after frequency conversion filters out high and low frequency component by the first bandpass filter 3
Noise.Light intensity modulation is carried out to first laser device 4 by lithium niobate Mach-Zehnder modulators 5, is then modulated to light load
On wave.After the first optical band pass filter 6 filters noise, to be emitted to free space big by the first transmitting antenna 7 for signal light
In gas channel.
As shown in figure 4, receiving end includes the second receiving antenna 13, magnitude amplifier 14, optical mixer unit 15, second laser
16, the second optical band pass filter 17, the second photodetector 18, the second bandpass filter 19, the 2nd I/Q frequency mixer 20 and second
Butterworth LPF 21.Wherein, second receiving antenna 13, magnitude amplifier 14, optical mixer unit 15, the second light belt
Bandpass filter 17, the second photodetector 18 are successively connected with optical fiber, the second photodetector 18, the second bandpass filter 19,
2nd I/Q frequency mixer 20 and the second Butterworth LPF 21 are sequentially connected electrically, the optical mixer unit 15 and second laser
Device 16 is connected with optical fiber.
Second receiving antenna 13 receives signal light, and magnitude amplifier 14 amplifies processing to received signal, after processing
Signal light and second laser 16 generate virtual local oscillator light heterodyne mixing is carried out in optical mixer unit 15.By after mixing
Two optical band pass filters 17 filter DC terms and high frequency item, into 18 probe response electric current of the second photodetector.After detection
To electric signal need to make using the second bandpass filter 19 bandwidth control in intermediate-freuqncy signal detection range, can be detected
Frequency electric signal.Also need the 2nd I/Q frequency mixer 20 in the demodulation judging process of electrical domain to complete mixing operations, i.e., with it is additional
High-frequency signal LO2It is multiplied, the signal after mixing can be extracted useful by the second Butterworth LPF 21
Ofdm signal.Ofdm signal demodulates original data signal by external ofdm demodulator.
As shown in figure 3, the receiving end R in the relay nodeXWith transmitting terminal TXBetween by AF relay structure realize amplification
Forwarding, the AF relay structure include the first receiving antenna 8 successively connected with optical fiber, the first photodetector 9, Ge amplifier
10, electro-optical conversion circuit 11, the second transmitting antenna 12.
Receive the signal in atmosphere by the first receiving antenna 8, then optical signal is carried out by the first photoelectric converter 9
Received optical signal is converted to electric signal, amplifies signal using Ge amplifier 10 by photoelectric conversion.Amplified letter
Number entering back into electro-optical conversion circuit 11 is converted into optical signal, forwards a signal to next AF relaying section by the second transmitting antenna 12
It is handled in point.
The utility model can increase system channel capacity by designing above with the coverage area of further expansion signal,
Influence of the atmospheric turbulance to communication quality is significantly reduced, to improve the reliability and stability of system communication.AF relaying
The application of technology is easily achieved in real life but also the utility model structure is simple, system deployment more has flexibility.
Claims (3)
1. relay is combined in a kind of free space optical communication serial parallel, which is characterized in that it includesMThe parallel transmitting link road of item,
Each link again byNA serial AF relay node composition；WhereinM、NFor positive integer,M≥2, NA AF relay node is placed in
On transmitting terminal to the straight line of receiving end, the straight line of transmitting terminal to receiving end is divided intoN+1 equal portions.
2. relay is combined in free space optical communication serial parallel according to claim 1, which is characterized in that in each
After node by receiving end RXWith transmitting terminal TXComposition, the transmitting terminal TXIncluding the first Butterworth low pass wave being sequentially connected
Device (1), the first I/Q frequency mixer (2), the first bandpass filter (3), lithium niobate Mach-Zehnder modulators (5), the first light belt
Bandpass filter (6) and the first transmitting antenna (7)；The lithium niobate Mach-Zehnder modulators (5) are also connected with first laser device
(4)；The receiving end RXIncluding the second receiving antenna (13), magnitude amplifier (14), optical mixer unit (15), being sequentially connected
Two optical band pass filters (17), the second photodetector (18), the second bandpass filter (19), the 2nd I/Q frequency mixer (20) and
Second Butterworth LPF (21)；Wherein, second laser (16) are also connected on the optical mixer unit (15).
3. relay is combined in free space optical communication serial parallel according to claim 1, which is characterized in that the relaying
Receiving end R in nodeXWith transmitting terminal TXBetween by AF relay structure realize amplification forwarding, the AF relay structure include according to
Secondary connected the first receiving antenna (8), the first photodetector (9), Ge amplifier (10), electro-optical conversion circuit (11), second
Transmitting antenna (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821739196.6U CN208986943U (en) | 2018-10-25 | 2018-10-25 | Relay is combined in free space optical communication serial parallel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821739196.6U CN208986943U (en) | 2018-10-25 | 2018-10-25 | Relay is combined in free space optical communication serial parallel |
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| CN201821739196.6U Expired - Fee Related CN208986943U (en) | 2018-10-25 | 2018-10-25 | Relay is combined in free space optical communication serial parallel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769880A (en) * | 2020-07-03 | 2020-10-13 | 中国计量大学 | Serial relay OFDM free space optical communication system and method applying wavelength diversity |
| CN112564795A (en) * | 2020-12-09 | 2021-03-26 | 中国计量大学 | MIMO-OSTBC parallel relay free space optical communication system and method based on GFDM |
-
2018
- 2018-10-25 CN CN201821739196.6U patent/CN208986943U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769880A (en) * | 2020-07-03 | 2020-10-13 | 中国计量大学 | Serial relay OFDM free space optical communication system and method applying wavelength diversity |
| CN111769880B (en) * | 2020-07-03 | 2021-04-30 | 中国计量大学 | Serial relay OFDM free space optical communication system and method applying wavelength diversity |
| CN112564795A (en) * | 2020-12-09 | 2021-03-26 | 中国计量大学 | MIMO-OSTBC parallel relay free space optical communication system and method based on GFDM |
| CN112564795B (en) * | 2020-12-09 | 2022-01-14 | 中国计量大学 | MIMO-OSTBC parallel relay free space optical communication system and method based on GFDM |
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Granted publication date: 20190614 Termination date: 20201025 |