CN103795495A - Asymmetric communication method and device - Google Patents
Asymmetric communication method and device Download PDFInfo
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- CN103795495A CN103795495A CN201310755099.1A CN201310755099A CN103795495A CN 103795495 A CN103795495 A CN 103795495A CN 201310755099 A CN201310755099 A CN 201310755099A CN 103795495 A CN103795495 A CN 103795495A
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Abstract
The invention discloses an asymmetric communication method and device. The asymmetric communication sending method comprises the steps that multi-channel information data are subjected to channel coding; and the information data after multi-channel coding are subjected to framing and spectrum spreading operation. The asymmetric communication sending device comprises a channel coding module and a multiple connection module. The channel coding module carries out channel coding on the multi-channel information data flow to be transmitted. The multiple connection module carries out framing on the multi-channel information data flow after channel coding to form one channel of frame data flow with fixed frame length and format, and the data flow is sent after subsection spectrum spreading and band-pass modulation. Asymmetric transmission of more than two channels of information data is achieved, and the transmission requirements of communication symbols which have high safety requirements can be met.
Description
Technical field
The invention belongs to communication technical field, relate to a kind of asymmetric communication method and apparatus, particularly a kind of for the higher asymmetric communication method and apparatus of transmission information security requirement.
Background technology
In asymmetric communication, conventionally adopt UQPSK technology.As shown in Figure 1, UQPSK technology adopts PSK modulation, and the signal space of PSK modulation is a two-dimensional quadrature space, comprises two mutually orthogonal components, wherein ψ
1(t)=cos ω
0t is in-phase component, ψ
2(t)=sin ω
0t is quadrature component.Therefore, the UQPSK technology of the present stage different information of transmitting two paths simultaneously.The data flow of two-way information can have different bit rates, in incoherent two-way independent information data flow, transmit respectively, and the data of adjustable this two-way information are stayed the power proportions ρ of the whole deposit of faith, therefore, nearly all adopt non-equilibrium QPSK(UQPSK for the transmission of different types of information) technology.
But, because UQPSK only has two independently passages, therefore limit the type of the information data that can simultaneously carry, the configuration of bandwidth in asymmetric transmission, thereby affected the design of communication system, can not farthest meet the design object of communication system.
Summary of the invention
The present invention is in order to solve above-mentioned at least one problem and/or deficiency, and following at least one advantage is provided, and a kind of asymmetric communication method and apparatus is provided accordingly.
On the one hand, in embodiments of the present invention, provide a kind of asymmetric communication dispensing device, having comprised: channel coding module, multichannel inter-area traffic interarea waiting for transmission is carried out to chnnel coding;
Multiple connection module, has the frame data stream of fixed frame length and form by the multiline message data flow framing Cheng Yi road after channel coding, and sends after segmentation spread spectrum and bandpass modulation.
On the other hand, in embodiments of the present invention, provide a kind of asymmetric communication sending method, to multiline message data, wherein a road is that Information Security requires relatively high information data, carries out chnnel coding; Cushion framing according to the ratio of the speed after multiline message data encoding, formation one tunnel has the frame data stream of fixed frame length and form; Choose the pseudo-code with respective handling gain according to the security requirement of the relatively high information of described Information Security the relatively high information data of described security requirement is carried out to spread spectrum in the position in the described frame data stream with fixed frame length and form; The spread spectrum frame data stream forming after the operation of framing spread spectrum is carried out bandpass modulation and sent.
Also on the one hand, in embodiments of the present invention, provide a kind of asymmetric communication receiving system, having comprised: carrier synchronization module, for recovering the carrier wave of signal transmission; Acquiring pseudo code module, for catching the pseudo-code of signal transmission; Demodulation module, utilizes described carrier wave to carry out demodulation to signal transmission, obtains spread spectrum frame according to stream; Utilize described pseudo-code to carry out segmentation despreading to described spread spectrum frame according to stream; And according to frame format, frame data stream after segmentation despreading is separated to frame and obtain multiline message data; Channel decoding module, carries out channel decoding to described multiline message data and obtains original information data.
By adopting technique scheme, the present invention has not only realized the asymmetric transmission that exceedes two-way information data, and utilize spread spectrum, meet the transmission requirement of the higher information data of security requirement, simultaneously, the present invention's system bandwidth utilance that can maximize, thereby also meet the transmission performance requirement of communication system, further, at information receiving end, utilize the higher information data of fail safe to carry out synchronously (comprising carrier synchronization and sign synchronization), also improved synchronous fail safe.
Accompanying drawing explanation
Fig. 1 is UQPSK multiple connection technology schematic diagram;
Fig. 2 is asymmetric communication dispensing device schematic diagram in an embodiment of the present invention;
Fig. 3 is multiple connection module diagram of the present invention;
Fig. 4 is asymmetric communication sending method schematic diagram of the present invention;
Fig. 5 is that the present invention is led to required normalization system bandwidth W/W ' under modulation system in power proportions ρ and the different band of the relatively high shared deposit of faith of information of different fail safes;
Fig. 6 is asymmetric communication receiving system schematic diagram of the present invention.
Embodiment
Hereinafter, with reference to accompanying drawing, embodiments of the invention are described more fully, shown in the drawings of embodiments of the invention.But embodiments of the invention can be implemented in many different forms, and should originally not be interpreted as being limited to the embodiment listing at this.On the contrary, provide these exemplary embodiments, making the disclosure is thoroughly, and scope of the present invention is fully conveyed to those skilled in the art, in the accompanying drawings, for clarity, can exaggerate layer and size and the relative size in region.To omit the detailed description of known function and structure to avoid the main body problem of fuzzy embodiment.In accompanying drawing, identical label is used for representing identical element.
Although it should be understood that term first, second, third, etc. can be used to describe different elements, assembly, region, layer and/or part at this, these elements, assembly, region, layer and/or part are not limited to these terms.These terms are only for differentiating an element, assembly, region, layer or part and another element, assembly, region, layer or part.Therefore, the first element discussed below, the first assembly, first area, ground floor or Part I can be known as the second element, the second assembly, second area, the second layer or Part II and not depart from instruction of the present invention.
Term is in order to describe concrete exemplary embodiment as used herein, rather than is intended to limit the present invention.As used herein, unless context is clearly indicated, otherwise singulative is intended to comprise plural form.Will be further understood that in the present note in the time using term " to comprise ", show to exist feature, entirety, step, operation, element, assembly and/or their combination of statement.
Describe exemplary embodiment of the present invention at this with reference to cutaway view, described cutaway view is the schematic diagram of Utopian exemplary embodiment of the present invention (and intermediate structure).Same, for example can expect distortion as the shape of the view of the result of manufacturing technology and/or tolerance.Therefore, exemplary embodiment of the present invention should not be construed as limited to the special shape in the region shown in this, but can comprise, for example, and the difference of the shape being caused by manufacture.
Unless otherwise defined, otherwise all terms as used herein (comprising technical term and scientific terminology) have the meaning equivalent in meaning of conventionally understanding with those skilled in the art.Will be further understood that, unless clearly definition here, otherwise term (as the term defining in general dictionary) should be interpreted as having the meaning consistent with the meaning in the context of relevant technologies, should not explain with Utopian or too formal meaning their meaning.
Fig. 2 is asymmetric communication dispensing device schematic diagram in an embodiment of the present invention.
With reference to figure 2, in this asymmetric communication dispensing device, comprise that channel coding module is carried out chnnel coding to multichannel inter-area traffic interarea waiting for transmission simultaneously; Multiple connection module, has the frame data stream of fixed frame length and form by the multiline message data flow framing Cheng Yi road after channel coding, and after segmentation spread spectrum and bandpass modulation, is transmitted in channel.Individual in this asymmetric communication device, by adopting multiple connection module, when having realized multiline message data flow, process, break through the restriction of transmitting two paths information data simultaneously of UQPSK technology.And, by carrying out segmentation spread spectrum to there being multiline message data flow to form a circuit-switched data stream after multiple connection, improve the relatively high information of fail safe in prime information data flow, and guaranteed the relatively high confidence of this fail safe in the whole deposit of faith our air filter ratio and mediating of system bandwidth, improved bandwidth availability ratio.
In above-mentioned channel coding module, can adopt different channel coding methods for the characteristic of the entrained information of inter-area traffic interarea waiting for transmission and content, thereby reduce the error rate, improve the reliability that inter-area traffic interarea transmits in channel.For example, adoptable channel coding technology can be RS coding, convolution code, Turbo code etc.And the way of the inter-area traffic interarea that can carry out is unrestricted simultaneously, can Wei Yi road can, to multichannel, in the present embodiment, be also the restriction of customer service UQPSK technology to transmission way, in this module, the way of permission combing simultaneously can be more than Huo San road, Wei San road.
Fig. 3 is multiple connection module diagram in above-described embodiment.
With reference to figure 3, in multiple connection module, comprise framing module, segmentation spread spectrum module, bandpass modulation module.In framing module, the information data after the multiplex (MUX) coding that channel coding module is produced, wherein a road is that Information Security requires relatively high information data, process, thereby formation one tunnel has the frame data stream of fixed frame length and form.In the present embodiment, described framing module adopts following method to cushion framing operation:
1) multiline message data flow is cushioned respectively;
2) according to speed R1, R2, Ri after the frame length LEN_Fi on every road and multiline message data encoding ... Rn reads respectively from corresponding buffering
...
bit data put into frame the 1st, 2, i ... n part, wherein, i represents the way of n road inter-area traffic interarea;
3) by the data flow after framing with R1+R2+Ri+ ... the speed rates of Rn.
The frame data stream frame length and the frame format that form through framing module are fixed, thereby have guaranteed the periodicity of frame in frame data stream.
Segmentation spread spectrum module, carries out spread spectrum to frame data stream.Be different from whole frame data stream is carried out to spread spectrum, this module can, according to transmission restriction, can only be carried out spread spectrum operation to certain section in whole frame data stream.For example, be the fail safe of guarantee information transfer of data, to carrying out spread spectrum with respect to information data residing position in frame data stream, security requirement compare Gao Mou road.
Choosing of the spreading code adopting during to spread spectrum is the result of a balance, and this balance is the balance between fail safe and the required bandwidth of system of the relatively high information of Information Security.Because the raising of Information Security means the raising of through-put power, therefore, this balance is also the balance between power proportions ρ and the required bandwidth W of system of the relatively high shared whole deposit of faith of information of fail safe.In order to explain more clearly the present embodiment, the information data of supposing the second tunnel transmission is here that Information Security requires relatively high information, and the processing gain of the spreading code of choosing is G
ppass between the power proportions ρ of the high shared whole deposit of faith of information relative to fail safe is:
Therefore, if through balance, determine that the power proportions that information that Information Security is relatively high accounts for this deposit of faith is ρ
b, the spreading code of choosing should have
Processing gain.
Simultaneously, in order to improve in different frame by the correlation between the data flow of spread spectrum position section, to by multiple information bits of spread spectrum position section, be that in institute's framing, Information Security requires relatively high information bit, adopt same short pseudo-code sequence spread spectrum inapplicable, in the present embodiment, adopt a kind of new spread spectrum mode: adopt a long pseudo-code sequence, to being spread spectrum by all information of spread spectrum position section in each frame, use the different sections of long pseudo-code sequence to relevant by each information bit of spread spectrum position section.
Owing to adopting above spread spectrum mode, in the computational process of the processing gain of spreading code, should be as follows:
Wherein, G
pfor the processing gain of spreading code, R
chfor pseudo-code spreading rate, R is the speed that Information Security requires relatively high information, and N requires the figure place of relatively high information in institute's framing for Information Security.
Bandpass modulation module, carries out bandpass modulation to the multiple connection data flow after segmentation spread spectrum.Be used for having adopted framing module and segmentation spread spectrum module, in the asymmetric transmission that will realize at the present embodiment, break through the restriction that UQPSK technology can only adopt QPSK to modulate, in this bandpass modulation module, can adopt different modulation systems according to transmission requirement, such as 8PSK, QPSK, MASK etc.Thereby, a certain character representation by base-band information with carrier wave, and the carrier wave that contains base-band information is sent in channel, just realize the integrated transmission of information.
Fig. 4 is asymmetric communication sending method schematic diagram in another embodiment of the present invention.
With reference to figure 4, in step 401, multiline message data are carried out to chnnel coding, the operation that this chnnel coding step can be carried out with reference to channel coding module in above-described embodiment.In step 402, information data after multiplex (MUX) coding is carried out to the operation of framing spread spectrum, this framing spread spectrum operation can further comprise: the indicated operation of segmentation spread spectrum and the indicated bandpass modulation operation of step 4023 of framing operation, step 4022 that step 4021 is indicated, wherein, the operation that the data of step 4021,4022,4023 pairs of inputs are carried out respectively can be with reference to framing module, segmentation spread spectrum module and bandpass modulation module in above-described embodiment.Can directly send into information through step 402 data flow after treatment transmits.
In the above-described embodiments, by in asymmetric process of transmitting, in the process of weighing between fail safe to the relatively high information of fail safe and the required bandwidth W of system, because the raising of Information Security means the raising of through-put power, therefore, this balance is also the balance between power proportions ρ and the required bandwidth W of system of the relatively high shared whole deposit of faith of information of fail safe.
Suppose that the required bandwidth of transmission out of Memory is W ', using respectively under the condition of BPSK, QPSK, 8PSK bandpass modulation technology, the required bandwidth of system is:
The normalization that has provided system bandwidth required under each modulation system in Fig. 5 represents.In Fig. 5, give and use the normalization of the required system bandwidth of UQPSK technology to represent.As can be seen from Figure 5, when to the requirement of ρ relatively hour, adopt the method for the invention and select QPSK or 8PSK modulation technique can significantly reduce required system bandwidth with respect to UQPSK technology.
Fig. 6 is asymmetric communication receiving system schematic diagram in the embodiment of the present invention.
With reference to figure 6, corresponding with dispensing device, at receiving terminal, the receiving system in this enforcement adopts with the process of dispensing device contrary and processes, to recover the information data of transmitting terminal.At this asymmetric communication receiving system, carrier synchronization module, acquiring pseudo code module, solution multiple connection module, channel decoding module.
With further reference to Fig. 6, carrier synchronization module and acquiring pseudo code module, for recover carrier wave and the pseudo-code of synchronizeing with signal transmission at receiving terminal, expand the demodulation of signal thereby realize, and this is the key that receiving terminal is realized asymmetrical information transmission.It may be noted that a bit, carrier synchronization utilization be that Information Security after despreading requires relatively high information; And the synchronous pseudo-code clock extracting of pseudo-code is the clock of spread spectrum frame data stream, use this clock can be to the detection that is concerned with of the baseband waveform after demodulation.So carrier synchronization is also improved because Information Security requires the raising of relative high Information Security with the fail safe of sign synchronization.
Separate multiple connection module, corresponding with above-mentioned multiple connection module, process for docking the breath of collecting mail, and then recover multiline message digital data stream.In this multiple connection module, utilize the carrier wave that carrier synchronization module recovers to carry out demodulation to the information receiving, this demodulation operation is corresponding with the modulation that transmitting terminal carries out, thereby recovers by demodulation the framing data flow that has framing module and segmentation spread spectrum module to produce at transmitting terminal.For framing data flow, owing to having carried out segmentation spread spectrum at transmitting terminal, first utilize the frequency expansion sequence that acquiring pseudo code module recovery goes out to carry out segmentation despreading, thereby recover the original set frame data stream without spread spectrum.This original set frame data stream is separated frame according to the frame format sending, and then can produce the multiline message data identical with transmitting terminal way.In preferential embodiment of the present invention, for aforementioned segmentation de-spreading operation, be to make capturing carrier and carrier wave with the benefit of enjoying the signal quality that brings of spread spectrum and improving, be concerned with, information carries out segmentation despreading before detection.
Channel decoding module, carries out respectively channel decoding to the multiline message data that produce.Corresponding to channel coding module, by adopting corresponding decoding algorithm, and then recover original multiline message data.
Although exemplify and described the present invention with reference to particular implementation of the present invention, but those skilled in the art will appreciate that in the case of not departing from the spirit and scope of the present invention that are defined by the claims, can make therein the various changes of form and details aspect.
Claims (10)
1. an asymmetric communication sending method, is characterized in that comprising:
Multiline message data are carried out to chnnel coding;
Information data after multiplex (MUX) coding is carried out to the operation of framing spread spectrum;
Described framing spread spectrum operation comprises:
Cushion framing according to the ratio of the speed after multiline message data encoding, form a road frame data stream;
Spread spectrum is carried out in position to the relatively high information data of security requirement in described frame data stream;
The spread spectrum frame data stream forming after the operation of framing spread spectrum is carried out bandpass modulation and sent.
2. method as claimed in claim 1, is characterized in that: described multiline message data are at least three tunnels.
3. method as claimed in claim 1, is characterized in that: the step of described buffering framing comprises:
Multiline message data flow is cushioned respectively;
According to the speed Ri after the frame length LEN_Fi of multiline message data flow and multiline message data channel coding, read respectively
bit data is put into the i part of frame, and i represents the way of n road inter-area traffic interarea;
By the data flow after framing with R1+R2+Ri+ ... the speed rates of Rn.
4. method as claimed in claim 1, is characterized in that: chooses spreading code according to following formula and carries out spread spectrum,
Wherein, G
pfor the processing gain after spreading code spread spectrum; ρ is the power proportions that the relatively high information data of described fail safe accounts for the whole deposit of faith.
5. an asymmetric communication dispensing device, is characterized in that comprising:
Channel coding module, carries out chnnel coding to multichannel inter-area traffic interarea waiting for transmission;
Multiple connection module, has the frame data stream of fixed frame length and form by the multiline message data flow framing Cheng Yi road after channel coding, and sends after segmentation spread spectrum and bandpass modulation;
Described multiple connection module comprises: framing module, segmentation spread spectrum module, bandpass modulation module,
Described framing module, cushions framing according to the ratio of the speed after multiline message data encoding, forms a road frame data stream;
Described segmentation spread spectrum module, spread spectrum is carried out in the position to the relatively high information data of security requirement in described frame data stream;
Described bandpass modulation module, carries out bandpass modulation to the spread spectrum frame data stream after segmentation spread spectrum module.
6. dispensing device as claimed in claim 5, is characterized in that: described channel coding module can be carried out chnnel coding to exceeding 3 tunnel information datas.
7. dispensing device as claimed in claim 5, is characterized in that: the buffering framing of described multiple connection submodule comprises:
Multiline message data flow is cushioned respectively;
According to the speed Ri after the frame length LEN_Fi of multiline message data flow and multiline message data channel coding, read respectively
bit data is put into the i part of frame, and i represents the way of n road inter-area traffic interarea;
By the data flow after framing with R1+R2+Ri+ ... the speed rates of Rn.
8. dispensing device as claimed in claim 5, is characterized in that: described segmentation spread spectrum module is determined spreading code according to following formula,
Wherein, G
pfor the processing gain after spreading code spread spectrum; ρ is the power proportions that the relatively high information data of described fail safe accounts for the whole deposit of faith.
9. an asymmetric communication receiving system, is characterized in that comprising:
Carrier synchronization module, for recovering the carrier wave of signal transmission;
Acquiring pseudo code module, for catching the pseudo-code of signal transmission;
Demodulation module, utilizes described carrier wave to carry out demodulation to signal transmission, obtains spread spectrum frame according to stream; Utilize described pseudo-code to carry out segmentation despreading to described spread spectrum frame data stream; And according to frame format, frame data stream after segmentation despreading is separated to frame and obtain multiline message data;
Channel decoding module, carries out channel decoding to described multiline message data and obtains original information data.
10. receiving system as claimed in claim 9, is characterized in that, described solution multiple connection module is carrying out carrying out segmentation despreading before coherent detection.
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