CN109218240A - A kind of signal in environment backscatter communication system is sent and detection method - Google Patents
A kind of signal in environment backscatter communication system is sent and detection method Download PDFInfo
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- CN109218240A CN109218240A CN201811228920.3A CN201811228920A CN109218240A CN 109218240 A CN109218240 A CN 109218240A CN 201811228920 A CN201811228920 A CN 201811228920A CN 109218240 A CN109218240 A CN 109218240A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
Abstract
The embodiment of the present invention provides the signal in a kind of environment backscatter communication system and sends and detection method.Sending method includes: to receive the source radiofrequency signal of ambient source transmitting；M metasymbol based on generation is modulated the source radiofrequency signal received, generates signal phasor and is sent to reception label, is based on multilevel energy detection method for receiving label, detects to the signal phasor received.By the M metasymbol of generation, order phase modulation is carried out to the source radiofrequency signal received, signal phasor is generated and is sent to reception label, effectively improve signal transmission rate.It receives label and sends the M metasymbol carried in the signal phasor that label emits using the detection of multilevel energy detection method, under conditions of not needing the source radiofrequency signal information of channel knowledge situation and ambient source transmitting, the signal phasor that reception label receives is only relied on to carry out the detection of M metasymbol, implement simple, better performances have very strong practicability.
Description
Technical field
The present embodiments relate to the signals in field of communication technology more particularly to a kind of environment backscatter communication system
Transmission and detection method.
Background technique
The concept of Internet of Things is initially to be proposed by the Kevin Ash-ton professor of Massachusetts Institute Technology in 1999:
The identification and management that article is carried out using Radio Frequency Identification Technology and sensor technology, enable a computer to receive in a manner of oneself
Collect information, can not go to observe with being limited by mankind's input data, identify and understand the world.2005, International Telecommunication Union
(ITU) there is new definition to Internet of Things in the internet report issued: by specific agreement, any of sensor will be equipped with
Real-world object is connected by internet, is realized between people and object or the information exchange between object and object, to realize one
The completely new immanent dynamic network of kind.
However, extensive communication will also bring the challenge of various aspects, wherein energy problem is especially prominent.The operation of equipment with
It services and be unable to do without energy resource supply, even the most basic communication of equipment room all needs the consumption energy.And traditional battery power supply can not
The access demand for meeting magnanimity exists simultaneously battery maintenance and cost overhead, and application scenarios are limited to wait limitation.So, how for
The equipment that magnanimity accesses in Internet of Things provides the energy and its normal communication is made just to become urgent problem to be solved.
The it is proposed of environment backscattering provides an effective solution for this problem.The communication mechanism is reflecting
The radiofrequency signal in environment is utilized during communication.It is different from traditional reflective communication system such as radio frequency identification (RFID)
It is that environment backscatter communication mainly has following two points advantage: (1) breaches energy from the office of the reader of active deployment
Limit, is not necessarily to specific carrier signal transmitter, and environmental footprint is subtle；(2) breach what conventional labels can only be communicated with reader
Limitation can be realized the information transmission between passive label.
Currently, most research work focuses primarily upon the environment backscatter communication system of binary modulation.For two
The environment backscattering of member modulation, label send a bit information in every symbol period.Since detection performance is often accredited
The influence of road situation, when channel condition is preferable, the data rate that every symbol period sends a bit information is provided compared to channel
Source seems that utilization rate is not high.To improve the utilization rate of channel resource, then need to shorten symbol period.Due to the symbol week of label
Phase by the control of the frequency of system oscillator, shortens symbol period and needs to improve oscillator frequency, and oscillator frequency is higher, energy
Consumption is bigger, and then improving data rate not by increasing the frequency of oscillator is a wise selection.Therefore, environment is promoted
Signal transmission rate in backscatter system becomes a urgent problem to be solved.And in environment backscatter system
When signal is detected, traditional signal detecting method is no longer applicable in, therefore it provides one is suitable for environment backscatter system
Middle signal detecting method also becomes a urgent problem to be solved.
Summary of the invention
The embodiment of the present invention provides the signal in a kind of environment backscatter communication system and sends and detection method, to solve
Low and big to the signal detection errors of the transmission defect of signal transmission rate, improves in certainly existing environment backscatter system
Signal transmission rate and detection accuracy.
The embodiment of the present invention provides the signaling method in a kind of environment backscatter communication system, comprising:
Receive the source radiofrequency signal of ambient source transmitting；
M metasymbol based on generation is modulated the source radiofrequency signal received, generates signal phasor and being sent to and connects
Label is received, multilevel energy detection method is based on for receiving label, the signal phasor received is detected；Wherein, M metasymbol
For any one symbol in { 0,1 ..., M-1 }.
The embodiment of the present invention provides the signal detecting method in a kind of environment backscatter communication system, comprising:
It receives and sends the signal phasor that label is sent, the signal phasor is that the transmission label is based on M metasymbol to ring
What the source radiofrequency signal that border source is sent was modulated；Wherein, M metasymbol is any one symbol in { 0,1 ..., M-1 }
Number；
Based on multilevel energy detection method, the signal phasor received is detected.
Signal in a kind of environment backscatter communication system provided in an embodiment of the present invention is sent and detection method, passes through
The M metasymbol of generation carries out order phase modulation to the source radiofrequency signal received, generates signal phasor and is sent to reception mark
Label, effectively improve signal transmission rate.Receive the signal that label sends label transmitting using the detection of multilevel energy detection method
The M metasymbol carried in vector, in the condition for the source radiofrequency signal information for not needing channel knowledge situation and ambient source transmitting
Under, number vector that reception label receives is only relied on to carry out the detection of M metasymbol, implements simple, better performances, is had very strong
Practicability.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the signaling method process in a kind of environment backscatter communication system provided in an embodiment of the present invention
Figure；
Fig. 2 is the signal detecting method process in a kind of environment backscatter communication system provided in an embodiment of the present invention
Figure；
Fig. 3 is according to a kind of environment backscatter communication system construction drawing provided in an embodiment of the present invention；
Fig. 4 is according to a kind of energy interval division schematic diagram provided in an embodiment of the present invention；
Fig. 5 is according to a kind of pilot frequency sequence schematic diagram provided in an embodiment of the present invention；
Fig. 6 is a kind of electronic devices structure block diagram for sending label provided in an embodiment of the present invention；
Fig. 7 is a kind of electronic devices structure block diagram for receiving label provided in an embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
The signal in a kind of environment backscatter communication system that embodiment provides for a better understanding of the present invention is sent
With detection method, here, being first illustrated to environment backscatter communication system.Environment backscatter communication system includes environment
Source sends label and receives label, wherein ambient source is the equipment that radio and television and mobile phone etc. can send electromagnetic wave, sends mark
Label and reception label are some low power consuming devices.It sends label and receives the electromagnetic wave in the collectable environment of label, as energy
Amount is for self-operating.Also, sending label and receiving label can also be used the electromagnetic wave of ambient source sending, carry out the transmission of signal
With detection.
Fig. 1 is the signaling method process in a kind of environment backscatter communication system provided in an embodiment of the present invention
Figure, executing subject are transmission label, as shown in Figure 1, this method comprises:
Step 101: receiving the source radiofrequency signal of ambient source transmitting；
Step 102: the M metasymbol based on generation is modulated the source radiofrequency signal received, generates signal phasor simultaneously
It is sent to reception label, multilevel energy detection method is based on for receiving label, the signal phasor received is detected；Its
In, M metasymbol is any one symbol in { 0,1 ..., M-1 }.
Specifically, ambient source emits electromagnetic wave into environment, since electromagnetic wave belongs to radiofrequency signal, in the present invention
The electromagnetic wave is known as source radiofrequency signal in embodiment.The source radiofrequency signal that label continuously receives ambient source transmitting is sent, for
Self-operating, and the general M metasymbol, i.e. any one symbol in { 0,1 ..., M-1 } such as continuously generate.Label is sent to be based on
The M metasymbol of generation is modulated the source radiofrequency signal received, it should be noted that when the different M metasymbol of generation
When, the modulation that label carries out out of phase to the source radiofrequency signal received is sent, M different M metasymbol is respectively to reception
To source radiofrequency signal carry out different M kind phase-modulations.It is all by multiple bits of encoded institutes for each M metasymbol
It obtains, therefore, the source radiofrequency signal received is modulated using M metasymbol and belongs to order phase modulation.
It sends label and the signal generated after modulation is known as signal phasor, and signal phasor is sent to reception label, with
It is based on multilevel energy detection method for receiving label, the signal phasor received is detected, to detect its M member symbol carried
Number.Wherein, multilevel energy detection method is the method that energy axes are divided into multiple energy sections.
It is logical to send label for signaling method in a kind of environment backscatter communication system provided in an embodiment of the present invention
The M metasymbol generated is crossed, order phase modulation is carried out to the source radiofrequency signal received, signal phasor is generated and is sent to reception
Label effectively improves the signal transmission rate in environment backscatter communication system.
Based on the above embodiment, in the signaling method in above-mentioned environment backscatter communication system, based on life
At M metasymbol, the source radiofrequency signal received is modulated, generate signal phasor simultaneously be sent to reception label, further
Include:
Every preset time, a M metasymbol is generated；One M metasymbol of every generation, the M metasymbol is loaded onto pre-
If in the source radiofrequency signal received in the period, to be adjusted to the source radiofrequency signal received in the preset time period
System, generates a signal phasor and is sent to reception label；Wherein, the preset time period be generate the M metasymbol when
Between put and generate a M metasymbol time point between period.
Specifically, sending label and generating M metasymbol is that interval generates, that is, at regular intervals, generates a M member symbol
Number.Whenever generating a M metasymbol, all by the time zone between the time point and the time point of the upper M metasymbol of generation
The interior source radiofrequency signal received is modulated, and is generated a signal phasor and is sent to reception label.
Based on the above embodiment, in the signaling method in above-mentioned environment backscatter communication system, ambient source
It is preferably Cyclic Symmetry multiple Gauss signal source.
Fig. 2 is the signal detecting method process in a kind of environment backscatter communication system provided in an embodiment of the present invention
Figure, executing subject are reception label, as shown in Fig. 2, this method comprises:
Step 201: receiving and send the signal phasor that label is sent, the signal phasor is that the transmission label is based on M member
Symbol is modulated the source radiofrequency signal that ambient source is sent；Wherein, M metasymbol is appointing in { 0,1 ..., M-1 }
It anticipates a symbol；
Step 202: being based on multilevel energy detection method, the signal phasor received is detected.
It receives label and receives the source radiofrequency signal that ambient source is sent, for self-operating, also, also receive making an uproar in environment
Acoustical signal and the signal phasor for sending label transmission.Transmission label can be extracted from all signals received by receiving label
The signal phasor of transmission, and detect its M metasymbol carried.Wherein, multilevel energy detection method is more to be divided into energy axes
The method in a energy section.
Signal detecting method in a kind of environment backscatter communication system provided in an embodiment of the present invention receives label benefit
The M metasymbol carried in the signal phasor for sending label transmitting is detected with multilevel energy detection method, is not needing channel knowledge feelings
Under conditions of condition and the source radiofrequency signal information of ambient source transmitting, the signal phasor that reception label receives is only relied on to carry out
Signal detection implements simple, better performances, with very strong practicability.
Based on the above embodiment, in the signal detecting method in above-mentioned environment backscatter communication system, based on more
Grade energy measuring method, detects the signal phasor received, further comprises:
A signal phasor is often received, the energy of the signal phasor is calculated；According to the energy of signal phasor institute
The energy section at place detects the M metasymbol carried in the signal phasor.
It should be noted that energy section has altogether M, the division in energy section is completed before testing already, also,
Each of { 0,1 ..., M-1 } symbol is with M energy section with mapping relations one by one.Therefore, in the embodiment of the present invention
In, if energy section locating for the energy of the known signal phasor received, using symbol corresponding to the energy section as
M metasymbol entrained by the signal phasor.
Based on the above embodiment, in the signal detecting method in above-mentioned environment backscatter communication system, according to institute
Energy section locating for the energy of signal phasor is stated, detects the M metasymbol carried in the signal phasor, before further include:
Based on insertion pilot tone system, energy axes are divided into M energy section；Determine each symbol in { 0,1 ..., M-1 }
Mapping relations one by one number with M energy section.
It should be noted that it is 0 that the starting point of energy axes, which represents energy, terminal is directed toward just infinite.It is understood that this hair
Bright embodiment is the partition process in energy section, meanwhile, in partition process, it may be determined that each symbol in { 0,1 ..., M-1 }
Mapping relations one by one number with M energy section.
Based on the above embodiment, in the signal detecting method in above-mentioned environment backscatter communication system, based on slotting
Enter pilot tone system, energy axes be divided into M energy section, further comprise:
Receive the pilot frequency sequence that the transmission label is sent；Wherein, the pilot frequency sequence includes in { 0,1 ..., M-1 }
M symbol；For each symbol, the average energy of the corresponding signal phasor of the symbol is obtained, and corresponding as the symbol
Signal phasor statistical variance；Based on M statistical variance of the corresponding signal phasor of the M symbol, energy axes are divided
For M energy section.
Based on the above embodiment, in the signal detecting method in above-mentioned environment backscatter communication system, it is based on institute
Energy axes are divided into M energy section, further comprise by M statistical variance for stating the corresponding signal phasor of M symbol:
M statistical variance ascending order is arranged, statistical variance set σ is formed2={ σ0 2,σ1 2,...,σM-1 2, and obtain correspondence
Array of indexes I={ I0,I1,...,IM-1}；Wherein, each element in array of indexes represents corresponding element in statistical variance set
Index position of the symbol corresponding to element in { 0,1 ..., M-1 }；In statistical variance set, successively based on every adjacent two
A statistical variance calculates an energy threshold；Based on M-1 energy threshold being calculated, energy axes are divided into M energy
Measure section.
Based on the above embodiment, it in the signal detecting method in above-mentioned environment backscatter communication system, is counting
In variance set, successively based on every two adjacent statistical variance σi 2And σi+1 2, calculate an energy threshold TiFormula are as follows:
Wherein, TiFor i-th of energy threshold, N is the length of signal phasor, σi 2For I in { 0,1 ..., M-1 }iA symbol
The statistical variance of number corresponding signal phasor, σi+1 2For I in { 0,1 ..., M-1 }iThe statistics of the corresponding signal phasor of a symbol
Variance.
Based on the above embodiment, in the signal detecting method in a kind of environment backscatter communication system, determine 0,
1 ..., M-1 } in each symbol and M energy section mapping relations one by one, further comprise:
By i-th of energy threshold TiWith i+1 energy threshold Ti+1Between energy section as the i-th+2 energy sections,
And by the i-th+2 energy section and I in { 0,1 ..., M-1 }i+2A symbol phase mapping.
Based on the above embodiment, the embodiment of the present invention is reversed to a kind of environment in conjunction with attached drawing as a preferred embodiment
Signal transmission in scatter communication system is further described with detection method:
Fig. 3 be according to a kind of environment backscatter communication system construction drawing provided in an embodiment of the present invention, as shown in figure 3,
The system includes: ambient source, sends label and receive label.Wherein, ambient source, to ambient enviroment emission source radiofrequency signal；Hair
It send label, receive the source radiofrequency signal that ambient source is sent and carries out order phase modulation to it and generate to be sent to after signal phasor to connect
Receive label；Label is received, source radiofrequency signal, the noise signal in environment and the letter for sending label transmission that ambient source is sent are received
Number vector, and it is detected.
H in Fig. 3sb、hsrAnd hbrChannel parameter, ambient source and the reception for respectively indicating ambient source and sending between label are marked
Channel parameter between channel parameter and transmission label between label and reception label, and all channels are flat block decline mould
Type, in flat block fading model, all channels are all constant in channel coherency time, but it is when different relevant
Between the variation of section be independent.X [n] indicates to send label received signal, expression formula are as follows:
X [n]=hsbs[n]；
Wherein, s [n] indicates the uncertain source signal of ambient source transmitting, and it obeys the distribution of Cyclic Symmetry multiple GaussWherein PsValue for label be unknown for receiving, while the different sample values of s [n] are independent same distributions
, the symbol for sending label transmitting is d ∈ { 0,1 ..., M-1 }, and d is phase for the probability of each symbol in { 0,1 ..., M-1 }
With.As shown in figure 3, M load is connected at the antenna port of transmission label, and corresponding M symbol for sending label, each load
Impedance be ZLoad, i.When i-th of load is connected to antenna, corresponding i-th of reflection coefficient is represented by
Wherein, ZantFor antenna impedance；Antenna is matched with load impedance or load short circuits state correspond respectively to Γ=0 and
Γ=1.Phase-shift keying (PSK) is modulated, all symbols are corresponding | Γi| value it is identical.
Channel in the embodiment of the present invention is unknown but invariable whithin a period of time.Due to by energy limit, and
And according to the characteristic of Internet of Things, the transmission rate for sending label can be far below the Nyquist rate of source signal, it is assumed that in N number of company
It remains unchanged, then can be indicated by the signal of transmission tag reflection in continuous s [n] are as follows:
xb[n]=Γix[n]
Under the hypothesis that symbol i is sent, receives n-th of sample at label and be represented by
Y [n]=hsrs[n]+hbrxb[n]+w [n]=(hsr+hsbhbrΓi)s[n]+w[n]；
Wherein,It is Gauss additive white noise, NωIt is noise power spectral density.
The M for receiving label and sending label transmitting using the judgement of multilevel energy detection method in environment backscatter communication system
Metasymbol relies solely on reception label and receives under conditions of not needing related channel situation and environment source signal information
Signal phasor carry out signal detection, scheme is implemented simple, and better performances are very practical.
Fig. 4 is according to a kind of energy interval division schematic diagram provided in an embodiment of the present invention, for receiving label based on more
The process of M metasymbol entrained by the signal phasor that grade energy measuring method detection receives, the specific steps are as follows:
Step 1, based on the signal phasor y received, signal energy Z=is calculated | | y | |2；
Step 2, based on insertion pilot tone system, statistical variance set σ is obtained2={ σ0 2,σ1 2,...,σM-1 2And corresponding index
Array I={ I0,I1,...,IM-1, calculate M-1 energy threshold T of multilevel energy detectioni(0 ..., M-2), and obtain M
A energy section, as shown in Figure 4.
Step 3, if energy section in the step 2 that the signal energy in step 1 is fallen intoIn, then judge to send
The symbol that label generates is the I in { 0,1 ..., M-1 }iA symbol.
Wherein, step 2 is further described, Fig. 5 is to be shown according to a kind of pilot frequency sequence provided in an embodiment of the present invention
It is intended to, the process for dividing energy section using insertion pilot tone system is as follows:
Sending label to emit a length at regular intervals is LtThe pilot frequency sequence of M, training sequence composition as shown in figure 5,
Corresponding received signal vector is tl(l=1 ..., LtM)；
To the corresponding signal phasor t of each symbol in { 0,1 ..., M-1 }l(l=(m-1) Lt+ 1 ..., mLt) returned
One change processing obtains the average energy z={ z of the corresponding signal phasor of corresponding each symbol1..., zM, wherein
Using the corresponding average energy of the symbol as the statistical variance of the corresponding signal phasor of the symbol, and based on M symbol
Energy axes are divided into M energy section by M statistical variance of number corresponding signal phasor.
In a specific embodiment, the signal in a kind of environment backscatter communication system provided in an embodiment of the present invention
Transmission and detection method, have done corresponding performance evaluation to the detection scene of proposition:
The symbol error rate expression formula of multilevel energy detection method under multiple Gauss signal source is as follows:
Wherein, hi=hsr+hsbhbrΓi；γ=Ps/NwIndicate the signal-to-noise ratio at ambient source.It can thus be concluded that signal-to-noise ratio is got over out
Height, N is bigger, and the smaller i.e. detection performance of symbol error rate is better；But when signal-to-noise ratio is increased to close to infinity, symbol error
Rate levels off to an error floor.In addition, influence of the relative mistake of channel between any two to symbol error rate is also very big, and believe two-by-two
Road relative mistake is bigger, and detection performance is better.
High order modulation needs to send certain training sequence to estimate to receive signal statistics variance in the embodiment of the present invention, and
It does not need to symbolic coding is sent, for supporting the system for sending training sequence more practical.
Fig. 6 is a kind of electronic devices structure block diagram for sending label provided in an embodiment of the present invention, as shown in fig. 6, described
Equipment includes: processor (processor) 601, memory (memory) 602 and bus 603；Wherein, 601 He of processor
The memory 602 completes mutual communication by the bus 603；The processor 601 is for calling the memory
Program instruction in 602, to execute method provided by above-mentioned each method embodiment, for example, receive ambient source transmitting
Source radiofrequency signal；M metasymbol based on generation is modulated the source radiofrequency signal received, generates signal phasor and sends
To label is received, it is based on multilevel energy detection method for receiving label, the signal phasor received is detected；Wherein, M member
Symbol is any one symbol in { 0,1 ..., M-1 }.
Fig. 7 is a kind of electronic devices structure block diagram for receiving label provided in an embodiment of the present invention, as shown in fig. 7, described
Equipment includes: processor (processor) 701, memory (memory) 702 and bus 703；Wherein, 701 He of processor
The memory 702 completes mutual communication by the bus 703；The processor 701 is for calling the memory
Program instruction in 702, to execute method provided by above-mentioned each method embodiment, for example, receive and send label transmission
Signal phasor, the signal phasor is the source radiofrequency signal progress that the transmission label sends ambient source based on M metasymbol
What modulation obtained；Wherein, M metasymbol is any one symbol in { 0,1 ..., M-1 }；It is right based on multilevel energy detection method
The signal phasor received is detected.
The embodiment of the present invention discloses a kind of computer program product, and the computer program product is non-transient including being stored in
Computer program on computer readable storage medium, the computer program include program instruction, when described program instructs quilt
When computer executes, computer is able to carry out method provided by above-mentioned each method embodiment, for example, receives ambient source hair
The source radiofrequency signal penetrated；M metasymbol based on generation is modulated the source radiofrequency signal received, generates signal phasor simultaneously
It is sent to reception label, multilevel energy detection method is based on for receiving label, the signal phasor received is detected；Its
In, M metasymbol is any one symbol in { 0,1 ..., M-1 }.
The embodiment of the present invention discloses a kind of computer program product, and the computer program product is non-transient including being stored in
Computer program on computer readable storage medium, the computer program include program instruction, when described program instructs quilt
When computer executes, computer is able to carry out method provided by above-mentioned each method embodiment, for example, receives and sends label
The signal phasor of transmission, the signal phasor are the source radiofrequency signals that the transmission label sends ambient source based on M metasymbol
It is modulated；Wherein, M metasymbol is any one symbol in { 0,1 ..., M-1 }；It is detected based on multilevel energy
Method detects the signal phasor received.
The embodiment of the present invention provides a kind of non-transient computer readable storage medium, the non-transient computer readable storage
Medium storing computer instruction, the computer instruction make the computer execute side provided by above-mentioned each method embodiment
Method, for example, receive the source radiofrequency signal of ambient source transmitting；M metasymbol based on generation, to the source radiofrequency signal received
It is modulated, generates signal phasor and be simultaneously sent to reception label, be based on multilevel energy detection method for receiving label, to receiving
Signal phasor detected；Wherein, M metasymbol is any one symbol in { 0,1 ..., M-1 }.
The embodiment of the present invention provides a kind of non-transient computer readable storage medium, the non-transient computer readable storage
Medium storing computer instruction, the computer instruction make the computer execute side provided by above-mentioned each method embodiment
Method, for example, receive and send the signal phasor that label is sent, the signal phasor is that the transmission label is based on M metasymbol
The source radiofrequency signal that ambient source is sent is modulated；Wherein, M metasymbol is any one in { 0,1 ..., M-1 }
A symbol；Based on multilevel energy detection method, the signal phasor received is detected.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above method embodiment can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can be stored in a computer readable storage medium, the program
When being executed, step including the steps of the foregoing method embodiments is executed；And storage medium above-mentioned includes: ROM, RAM, magnetic disk or light
The various media that can store program code such as disk.
Through the above description of the embodiments, those skilled in the art can be understood that each embodiment can
It realizes by means of software and necessary general hardware platform, naturally it is also possible to pass through hardware.Based on this understanding, on
Stating technical solution, substantially the part that contributes to existing technology can be embodied in the form of software products in other words, should
Computer software product may be stored in a computer readable storage medium, such as ROM/RAM, magnetic disk, CD, including several fingers
It enables and using so that a computer equipment (can be personal computer, server or the network equipment etc.) executes each implementation
Method described in certain parts of example or embodiment.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. the signaling method in a kind of environment backscatter communication system characterized by comprising
Receive the source radiofrequency signal of ambient source transmitting；
M metasymbol based on generation is modulated the source radiofrequency signal received, generates signal phasor and is sent to reception mark
Label are based on multilevel energy detection method for receiving label, detect to the signal phasor received；Wherein, M metasymbol is
Any one symbol in { 0,1 ..., M-1 }.
2. sending method according to claim 1, which is characterized in that the M metasymbol based on generation penetrates the source received
Frequency signal is modulated, and is generated signal phasor and is sent to reception label, further comprises:
Every preset time, a M metasymbol is generated；
One M metasymbol of every generation, the M metasymbol is loaded onto the source radiofrequency signal received in preset time period, with
The source radiofrequency signal received in the preset time period is modulated, a signal phasor is generated and is sent to reception mark
Label；
Wherein, the preset time period is to generate between the time point of the M metasymbol and the time point of the upper M metasymbol of generation
Period.
3. sending method according to claim 1, which is characterized in that the ambient source is Cyclic Symmetry multiple Gauss signal
Source.
4. the signal detecting method in a kind of environment backscatter communication system characterized by comprising
It receives and sends the signal phasor that label is sent, the signal phasor is that the transmission label is based on M metasymbol to ambient source
What the source radiofrequency signal of transmission was modulated；Wherein, M metasymbol is any one symbol in { 0,1 ..., M-1 }；
Based on multilevel energy detection method, the signal phasor received is detected.
5. detection method according to claim 4, which is characterized in that multilevel energy detection method is based on, to the letter received
Number vector is detected, and further comprises:
A signal phasor is often received, the energy of the signal phasor is calculated；
According to energy section locating for the energy of the signal phasor, the M metasymbol carried in the signal phasor is detected.
6. according to the method described in claim 5, it is characterized in that, the energy range according to locating for the energy of the signal phasor
Between, detect the M metasymbol carried in the signal phasor, before further include:
Based on insertion pilot tone system, energy axes are divided into M energy section；
Determine each symbol in { 0,1 ..., M-1 } and the mapping relations one by one in M energy section.
7. according to the method described in claim 6, it is characterized in that, energy axes are divided into M energy based on insertion pilot tone system
Section further comprises:
Receive the pilot frequency sequence that the transmission label is sent；Wherein, the pilot frequency sequence includes M symbol in { 0,1 ..., M-1 }
Number；
For each symbol, the average energy of the corresponding signal phasor of the symbol is obtained, and as the corresponding letter of the symbol
The statistical variance of number vector；
Based on M statistical variance of the corresponding signal phasor of the M symbol, energy axes are divided into M energy section.
8. the method according to the description of claim 7 is characterized in that M based on the corresponding signal phasor of the M symbol is united
Variance is counted, energy axes are divided into M energy section, further comprise:
M statistical variance ascending order is arranged, statistical variance set σ is formed2={ σ0 2,σ1 2,...,σM-1 2, and obtain corresponding rope
Argument group I={ I0,I1,...,IM-1}；Wherein, each element in array of indexes represents corresponding element institute in statistical variance set
Index position of the corresponding symbol in { 0,1 ..., M-1 }；
In statistical variance set, successively based on every two adjacent statistical variances, an energy threshold is calculated；
Based on M-1 energy threshold being calculated, energy axes are divided into M energy section.
9. according to the method described in claim 8, it is characterized in that, in statistical variance set, successively based on every adjacent two
A statistical variance σi 2And σi+1 2, calculate an energy threshold TiFormula are as follows:
Wherein, TiFor i-th of energy threshold, N is the length of signal phasor, σi 2For I in { 0,1 ..., M-1 }iA symbol is corresponding
Signal phasor statistical variance, σi+1 2For I in { 0,1 ..., M-1 }i+1The statistics side of the corresponding signal phasor of a symbol
Difference.
10. according to the method described in claim 9, it is characterized in that, determine { 0,1 ..., M-1 } in each symbol with it is described
The mapping relations one by one in M energy section further comprise:
By i-th of energy threshold TiWith i+1 energy threshold Ti+1Between energy section as the i-th+2 energy sections, and will
The i-th+2 energy section and I in { 0,1 ..., M-1 }i+2A symbol phase mapping.
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