CN205596125U - Terahertz is communication system now based on RSLDPC coding techniques - Google Patents
Terahertz is communication system now based on RSLDPC coding techniques Download PDFInfo
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- CN205596125U CN205596125U CN201620075482.1U CN201620075482U CN205596125U CN 205596125 U CN205596125 U CN 205596125U CN 201620075482 U CN201620075482 U CN 201620075482U CN 205596125 U CN205596125 U CN 205596125U
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Abstract
The utility model provides a terahertz is communication system now based on RSLDPC coding techniques, including the transmitting terminal with the receiving terminal, the transmitting terminal is used for the agreement according to communication transmission, sends the complete data frame that contains the coded data package, the coded data package comprises data bit and check bit through RSLDPC encoded mode code, the receiving terminal is used for receiving complete data frame to analyze it, according to the RSLDPC decoding algorithm in wrapping from coded data, draw and resume crude data. The utility model discloses comparing and not adding the technological terahertz of channel coding communication system now, obtain several times promotion in the performance, transmission rate can reach more than the gbps, and communication distance has also obtained the promotion that is showing. Simultaneously, outstanding encoded mode can show the decline of the antagonism channel that lands like the LDPC sign indicating number, reduces the bit error rate, improves the comprehensive properties of system. The utility model discloses simple structure has promoted terahertz communication system performance now greatly, has extensive application prospect in the communication technology field now at the terahertz.
Description
Technical field
This utility model belongs to Terahertz communication technique field, particularly relates to a kind of Terahertz based on RS/LDPC coding techniques
Communication system.
Background technology
In recent decades, along with developing rapidly of terahertz emission source and detector, Terahertz correlation technique causes the wide of people
General concern.THz wave is electromagnetic frequency electromagnetic wave between 0.1～10THz, and wave band is between microwave and far infrared.Too
Hertz wave frequency is significantly larger than microwave, using the teaching of the invention it is possible to provide enough bandwidth, and communications capacity is big, it is possible to provide the up to nothing of 10Gb/s
Line transfer rate, is expected to become the information carrier of high-speed radiocommunication of future generation.Terahertz wave beam is narrow, good directionality, has very
Penetrate well the ability of sand and dust smog.Terahertz, due to its good confidentiality and the strong advantage of capacity of resisting disturbance, is especially suitable for short
Distance secret communication, has broad application prospects.Terahertz frequency is currently in white spaces, and Terahertz frequency range is used for height
Speed radio communication is also present study hotspot, seizes frequency spectrum resource and has very important strategic importance.
Terahertz communication is also in high speed development stage, indoor communications, nanometer network, and the research of the aspect such as space communication is
Launch successively.120GHz at present, the Terahertz communication system of multiple frequency range such as 300GHz, 3.9THz is all suggested and verifies.
But THz wave transmits in an atmosphere and can be absorbed, by atmospheric molecule, the loss spread with free space, and decay is very serious, with
Time be also highly susceptible to the impact of the factors such as weather.The factors such as the decay of atmospheric channel and noise jamming seriously limit Terahertz
The transfer rate of communication system and transmission range.The Terahertz communications system transmission distance reported at present is mostly confined to several meters
In the range of, and within the transfer rate of the Terahertz communication system with more than 1THz frequency as carrier wave is confined to 100MHz,
These theoretical channel capacity being the most also far from reaching Terahertz frequency range.
Existing Terahertz communication system is focused mainly in terahertz radiation source and the process improving of detector and performance boost,
Few people pay close attention to channel coding technology, and are applied to Terahertz communication system, improve the entirety of Terahertz communication system
Performance.
In view of the above, it is provided that a kind of transfer rate that can be effectively improved Terahertz communication system and the terahertz of communication distance
Hereby communication system is necessary.
Utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model is to provide a kind of based on RS/LDPC coding techniques
Terahertz communication system, be used for solving Terahertz communications system transmission speed and communication distance in prior art and there is relatively overall situation
The problem of limit.
RS code and LDPC code, as the outstanding channel coding method of two classes, are widely used in radio communication, disk storage, laser
The fields such as communication.This utility model combines the uniqueness of THz wave and the particularity of atmospheric channel, and RS/LDPC is encoded skill
Art introduces Terahertz communication system, has earth shaking novelty.According to atmospheric laser transmission channel model and THz wave
Attenuation characteristic, this utility model has carried out theoretical modeling analysis and experiment to RS/LDPC code performance in Terahertz communication system
Checking.
Theoretical and experimentation shows, Terahertz communication system based on RS/LDPC coding techniques is compared and do not added chnnel coding skill
The Terahertz communication system of art, has obtained the lifting of several times in performance, and transfer rate can reach more than Gbps, communication distance
Have also been obtained and be obviously improved.Meanwhile, outstanding coded system such as LDPC code can resist the decline of channel significantly, reduces
The bit error rate, improves the combination property of system.
For achieving the above object and other relevant purposes, this utility model provides a kind of Terahertz based on RS/LDPC coding techniques
Communication system, including transmitting terminal with receiving terminal；
Described transmitting terminal is for according to communication transport protocols, sending the complete Frame comprising coded data packet, described coded number
Encode through RS/LDPC coded system according to bag, be made up of data bit and check bit；
Described receiving terminal is for receiving described complete Frame, and resolves it, basis from coded data packet
RS/LDPC decoding algorithm, extracts and recovers original data.
As a kind of preferred version of Terahertz communication system based on RS/LDPC coding techniques of the present utility model, described completely
Frame include: synchronous code, start-of-frame, frame length, coded data packet and frame end symbol.
As a kind of preferred version of Terahertz communication system based on RS/LDPC coding techniques of the present utility model, described transmission
End includes: information source unit, RS/LDPC encoder, digital modulation unit, THz radiation source；Described information source unit is used for producing
Data stream, and require to be grouped according to RS/LDPC pattern, it is sequentially sent to RS/LDPC encoder；Described RS/LDPC
Encoder, for the data of input are carried out RS/LDPC mode coding, adds check bit, forms coded data packet；Described numeral
Modulating unit is for carrying out digital signal modulated to each frame data；Described THz radiation source is for launching terahertz according to modulated signal
Hereby ripple.
Preferably, described transmitting terminal also includes Frame forming unit, for by synchronous code, start-of-frame, frame length, coding
Packet and frame end symbol are combined into complete Frame.
Preferably, the one during described THz radiation source includes Terahertz quantum cascaded laser and single file carrier diode.
Preferably, the one during described RS/LDPC pattern includes RS pattern and LDPC code type.
As a kind of preferred version of Terahertz communication system based on RS/LDPC coding techniques of the present utility model, described reception
End includes: THz detector, digital demodulation unit, RS/LDPC decoder and stay of two nights unit；Described THz detector is used
In THz wave is converted into the signal of telecommunication；Described digital demodulation unit is for reverting to digital signal to analogue signal sampling demodulation；
Described RS/LDPC decoder entangles for using RS/LDPC decoded mode to carry out decoding the coded data packet in each frame data
Mistake, extracts original valid data；Described stay of two nights unit is used for receiving valid data.
Preferably, described receiving terminal also includes data-frame sync resolution unit, for the numeral demodulated from described digital demodulation unit
Signal extracts synchronizing signal, forms continuous print Frame.
Preferably, described THz detector includes the one in Terahertz quantum well detector and Schottky diode.
As it has been described above, Terahertz communication system based on RS/LDPC coding techniques of the present utility model, have the advantages that
Terahertz communication system based on RS/LDPC coding techniques of the present utility model compares the Terahertz not adding channel coding technology
Communication system, has obtained the lifting of several times in performance, and transfer rate can reach more than Gbps, and communication distance have also been obtained aobvious
The lifting write.Meanwhile, outstanding coded system such as LDPC code can resist the decline of channel significantly, reduces the bit error rate, carries
The combination property of high system.This utility model simple in construction, can be substantially improved and promote Terahertz communication system performance, too
Hertz communication technique field is with a wide range of applications.
Accompanying drawing explanation
Fig. 1 is shown as the system block diagram of Terahertz communication system based on RS/LDPC coding techniques of the present utility model.
Fig. 2 is shown as the knot of the complete Frame of Terahertz communication system based on RS/LDPC coding techniques of the present utility model
Structure schematic diagram.
Fig. 3 is shown as selecting RS (255,223) and (960,800) two kinds of patterns of LDPC and uncoded Terahertz communication system not
The simulation curve figure of same atmospheric environment.
Fig. 4 is shown as the Terahertz communication system selecting LDPC coded system noise under different transmission range, transfer rates
Compare curve chart.
Element numbers explanation
10 transmitting terminals
101 information source unit
102 RS/LDPC encoders
103 digital modulation unit
104 THz radiation source
20 receiving terminals
201 THz detectors
202 digital demodulation unit
203 RS/LDPC decoders
204 stay of two nights unit
Detailed description of the invention
Below by way of specific instantiation, embodiment of the present utility model being described, those skilled in the art can be by this specification institute
The content disclosed understands other advantages of the present utility model and effect easily.This utility model can also be by the most different tools
Body embodiment is carried out or applies, and the every details in this specification can also be based on different viewpoints and application, at the not back of the body
Various modification or change is carried out under spirit of the present utility model.
Refer to Fig. 1～Fig. 4.It should be noted that the diagram provided in the present embodiment illustrates that this practicality is new the most in a schematic way
The basic conception of type, component count when only display with relevant assembly in this utility model rather than is implemented according to reality in diagram then,
Shape and size are drawn, and during its actual enforcement, the kenel of each assembly, quantity and ratio can be a kind of random change, and its assembly
Layout kenel is likely to increasingly complex.
As shown in Figure 1 to 4, the present embodiment provides a kind of Terahertz communication system based on RS/LDPC coding techniques, including
Transmitting terminal 10 is with receiving terminal 20；
Described transmitting terminal 10 is for according to communication transport protocols, sending the complete Frame comprising coded data packet, described coding
Packet encodes through RS/LDPC coded system, is made up of data bit and check bit；
Described receiving terminal 20 is for receiving described complete Frame, and resolves it, basis from coded data packet
RS/LDPC decoding algorithm, extracts and recovers original data.
As in figure 2 it is shown, as example, described complete Frame includes: synchronous code, start-of-frame, frame length, coded number
According to bag and frame end symbol.
As it is shown in figure 1, as example, described transmitting terminal 10 includes: information source unit 101, RS/LDPC encoder 102, number
Word modulating unit 103, THz radiation source 104, wherein: described information source unit 101 is used for producing data stream, and according to RS/LDPC
Pattern requires to be grouped, and is sequentially sent to RS/LDPC encoder 102；Described RS/LDPC encoder 102 is for input
Data carry out RS/LDPC mode coding, add check bit, form coded data packet；Described digital modulation unit 103 is used for
Each frame data are carried out digital signal modulated；Described THz radiation source 104 is for launching THz wave according to modulated signal.
As example, described transmitting terminal 10 also includes Frame forming unit, be connected to described RS/LDPC encoder 102 with
And between digital modulation unit 103, for by synchronous code, start-of-frame, frame length, coded data packet and frame end symbol group
Synthesize complete Frame.
As example, described THz radiation source 104 includes in Terahertz quantum cascaded laser and single file carrier diode
A kind of.In the present embodiment, described THz radiation source 104 is selected as Terahertz quantum cascaded laser.
As example, described RS/LDPC pattern includes the one in RS pattern and LDPC code type.
As it is shown in figure 1, as example, described receiving terminal 20 includes: THz detector 201, digital demodulation unit 202, RS/LDPC
Decoder 203 and stay of two nights unit 204, wherein, described THz detector 201 is for being converted into the signal of telecommunication by THz wave；
Described digital demodulation unit 202 is for reverting to digital signal to analogue signal sampling demodulation；Described RS/LDPC decoder 203
For the coded data packet in each frame data uses RS/LDPC decoded mode carry out decoding error correction, extract original effective
Data；Described stay of two nights unit 204 is used for receiving valid data.
As example, described receiving terminal 20 also includes data-frame sync resolution unit, is connected to described for from described digital demodulation
Between unit 202 and RS/LDPC decoder 203, the digital signal of digital demodulation unit 202 demodulation extracts synchronizing signal,
Form continuous print Frame.
As example, described THz detector 201 includes the one in Terahertz quantum well detector and Schottky diode.
In the present embodiment, described THz detector 201 is selected as Terahertz quantum well detector.
It addition, by the data and the data of transmitting terminal 10 that contrast receiving terminal 20, it can be estimated that the Terahertz communication of the present embodiment
The combination property of system.
In order to further illustrate innovative point of the present utility model, the present embodiment selects RS (255,223) and LDPC (960,800) two kinds
Pattern and uncoded Terahertz communication system carry out Experimental comparison, select Terahertz quantum cascaded laser (QCL) as spoke
Penetrating source, and Terahertz quantum well detector (QWP) is as detector, working frequency points is 3.9THz, and system uses intensity
Modulation/directly detect (IM/DD) mode, OOK signal modulation transmissions, atmospheric channel is approximately additive white Gaussian noise (AWGN)
Channel.RS (255,223) and LDPC (960,800) code check are close, have with reference to property.Different atmospheric environments is entered by the present embodiment
Row simplation verification, result is as shown in Figure 3.From figure 3, it can be seen that in same atmospheric environment σxUnder the conditions of=0.1, reach
The same bit error rate 10-4, the system of LDPC coding exceeds the gain of 4.5dB, the system ratio of RS coding than uncoded system
Uncoded system exceeds the gain of 2.5dB, it can be seen that communication performance is significantly improved.When atmospheric environment becomes more to dislike
Time bad, at σxWhen=0.2, the most uncoded system of system encoded for RS/LDPC is reaching 10- 4The condition of error rate index
Under, coding gain substantially increases more.This explanation is in the case of environment is more severe, and system encoded for RS/LDPC is not to
Coding system can more be promoted in performance.Meanwhile, the performance entirety that also reflects LDPC code in figure is better than RS
Code, therefore in the case of resources supplIes allows, it should preferential selection LDPC coded system.We have estimated not simultaneous interpretation simultaneously
Signal to noise ratio under defeated distance, transfer rate, as shown in Figure 4.According to the result of Fig. 3, as long as system signal noise ratio is higher than 12dB,
At σxUnder the atmospheric environment of=0.1, the Terahertz communication system of RS/LDPC coding just can reach 10- 4Error rate index.If
Retaining the safety allowance of 2dB, the signal to noise ratio of 14dB just can make whole system without the transmission of error code.Understand from Fig. 4,14dB
Signal to noise ratio correspondence transmission range 20m, 10Gbps.While increasing transmission range, transfer rate can decline therewith.On the contrary,
If transmission range is less than 20m, transfer rate can easily reach 100Gbps even 1Tbps.This for 1THz with
On Terahertz communication system, transfer rate has had and has been obviously improved.For the Terahertz communication system of below 1THz, permissible
Obtain the result being similar to.Owing to frequency is different, Atmospheric Absorption and decay are also different, some frequency such as 120GHz of below 1THz,
300GHz etc. are less due to the atmospheric attenuation factor, and such Terahertz communication system is through RS/LDPC coded transmission speed only
Can faster, transmission range only can be farther, and systematic function can be significantly improved and promote.
As it is shown in figure 1, the build process of the Terahertz communication system of the present embodiment includes:
1) the concrete pattern of selected RS/LDPC code, determines the key parameter such as code length, code check.
2) according to pattern parameter and system requirements, value and the length of Frame of each field of communication transport protocols is determined.
3) between the information source unit 101 and digital modulation unit 103 of transmitting terminal 10 insert RS/LDPC encoder 102 and
Frame forming unit, described Frame forming unit for by synchronous code, start-of-frame, frame length, coded data packet and
Frame end symbol is combined into complete Frame.
4) between the digital demodulation unit and stay of two nights unit 204 of receiving terminal 20 insert data-frame sync resolution unit and
RS/LDPC decoder 203.
5) build Terahertz communication system based on RS/LDPC coding techniques, carry out integral united test and performance test.
6) according to atmospheric window and the difference of communications band, Terahertz communication system radiation source and detector module can use THz
QCL+THz quantum well detector forms, it would however also be possible to employ electronics system such as single file carrier diode radiates
Source, Schottky diode makees cymoscope composition.
As it has been described above, Terahertz communication system based on RS/LDPC coding techniques of the present utility model, have the advantages that
Terahertz communication system based on RS/LDPC coding techniques of the present utility model compares the Terahertz not adding channel coding technology
Communication system, has obtained the lifting of several times in performance, and transfer rate can reach more than Gbps, and communication distance have also been obtained aobvious
The lifting write.Meanwhile, outstanding coded system such as LDPC code can resist the decline of channel significantly, reduces the bit error rate, carries
The combination property of high system.This utility model simple in construction, can be substantially improved and promote Terahertz communication system performance, too
Hertz communication technique field is with a wide range of applications.So, this utility model effectively overcomes of the prior art all scarce
Put and have high industrial utilization.
Above-described embodiment only illustrative principle of the present utility model and effect thereof, not for limiting this utility model.Any
Above-described embodiment all can be modified under spirit and the scope of the present utility model or change by those skilled in the art.
Therefore, such as art has usually intellectual without departing from the spirit disclosed in this utility model with under technological thought
All equivalences completed are modified or change, and must be contained by claim of the present utility model.
Claims (7)
1. a Terahertz communication system based on RS/LDPC coding techniques, it is characterised in that include that transmitting terminal is with receiving terminal；
Described transmitting terminal is for according to communication transport protocols, sending the complete Frame comprising coded data packet, and described coded data packet encodes through RS/LDPC coded system, is made up of data bit and check bit；
Described receiving terminal is for receiving described complete Frame, and resolves it, according to RS/LDPC decoding algorithm from coded data packet, extracts and recovers original data.
Terahertz communication system based on RS/LDPC coding techniques the most according to claim 1, it is characterised in that: described transmitting terminal includes: information source unit, RS/LDPC encoder, digital modulation unit, THz radiation source；
Described information source unit is used for producing data stream, and requires to be grouped according to RS/LDPC pattern, is sequentially sent to RS/LDPC encoder；
Described RS/LDPC encoder, for the data of input are carried out RS/LDPC mode coding, adds check bit, forms coded data packet；
Described digital modulation unit is for carrying out digital signal modulated to each frame data；
Described THz radiation source is for launching THz wave according to modulated signal.
Terahertz communication system based on RS/LDPC coding techniques the most according to claim 2, it is characterized in that: described transmitting terminal also includes Frame forming unit, for synchronous code, start-of-frame, frame length, coded data packet and frame end symbol is combined into complete Frame.
Terahertz communication system based on RS/LDPC coding techniques the most according to claim 2, it is characterised in that: described THz radiation source includes the one in Terahertz quantum cascaded laser and single file carrier diode.
Terahertz communication system based on RS/LDPC coding techniques the most according to claim 1, it is characterised in that: described receiving terminal includes: THz detector, digital demodulation unit, RS/LDPC decoder and stay of two nights unit；
Described THz detector is for being converted into the signal of telecommunication by THz wave；
Described digital demodulation unit is for reverting to digital signal to analogue signal sampling demodulation；
Described RS/LDPC decoder, for the coded data packet in each frame data uses RS/LDPC decoded mode carry out decoding error correction, extracts original valid data；
Described stay of two nights unit is used for receiving valid data.
Terahertz communication system based on RS/LDPC coding techniques the most according to claim 5, it is characterized in that: described receiving terminal also includes data-frame sync resolution unit, for extracting synchronizing signal from the digital signal that described digital demodulation unit demodulates, form continuous print Frame.
Terahertz communication system based on RS/LDPC coding techniques the most according to claim 5, it is characterised in that: described THz detector includes the one in Terahertz quantum well detector and Schottky diode.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106998231A (en) * | 2016-01-26 | 2017-08-01 | 中国科学院上海微系统与信息技术研究所 | A kind of Terahertz communication system based on RS/LDPC coding techniques |
| CN108731823A (en) * | 2017-04-20 | 2018-11-02 | 清华大学 | A kind of THz wave means of communication |
-
2016
- 2016-01-26 CN CN201620075482.1U patent/CN205596125U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106998231A (en) * | 2016-01-26 | 2017-08-01 | 中国科学院上海微系统与信息技术研究所 | A kind of Terahertz communication system based on RS/LDPC coding techniques |
| CN108731823A (en) * | 2017-04-20 | 2018-11-02 | 清华大学 | A kind of THz wave means of communication |
| CN108731823B (en) * | 2017-04-20 | 2020-02-07 | 清华大学 | Terahertz wave communication method |
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