CN110266370A - Wireless communications method, device, system, transmitting terminal and receiving end - Google Patents
Wireless communications method, device, system, transmitting terminal and receiving end Download PDFInfo
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- CN110266370A CN110266370A CN201910588763.5A CN201910588763A CN110266370A CN 110266370 A CN110266370 A CN 110266370A CN 201910588763 A CN201910588763 A CN 201910588763A CN 110266370 A CN110266370 A CN 110266370A
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- receiving end
- transmitting terminal
- messaging parameter
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- frequency shift
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
- H04B7/18543—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection for adaptation of transmission parameters, e.g. power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
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- Computer Networks & Wireless Communication (AREA)
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- Mobile Radio Communication Systems (AREA)
Abstract
The present invention provides a kind of wireless communications method, device, system, transmitting terminal and receiving ends, are related to wireless communication technology field, this method comprises: obtaining messaging parameter, the chip Doppler frequency shift between transmitting terminal and receiving end is calculated according to messaging parameter；The target transmission rate of transmitting terminal or the intended recipient rate of receiving end are determined according to chip Doppler frequency shift and standard speed；Transmitting terminal emits echo signal to be sent to receiving end according to target transmission rate, so that receiving end receives echo signal according to standard speed, alternatively, receiving end receives the echo signal that transmitting terminal emits according to standard speed according to intended recipient rate.In this way for the transmitting terminal for being in high-speed mobile and/or receiving end, by carrying out the transmitting of signal using target transmission rate in transmitting terminal or carrying out the reception of signal using intended recipient rate in receiving end, reduce the influence of Doppler frequency shift, frequency estimation accuracy is improved, avoids intersymbol interference to a certain extent.
Description
Technical field
The present invention relates to wireless communication technology fields, more particularly, to a kind of wireless communications method, device, system, transmitting
End and receiving end.
Background technique
Technology is in recent years by OFDM (Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexing)
It is widely used, due to the introducing of cyclic prefix, OFDM can tolerate certain symbol timing error.It is being based on
In the communication system of OFDM, multiple technologies are used for the synchronization of signal, tracking process, for example, receiving end can use correlation method
Frame synchronization sequence is detected, determines the initial position of each standard Timeslot；It can also be by the accurate space-time of receiving-transmitting sides
Benchmark substantially estimates the arrival time of frame head, determines the initial position of standard Timeslot.
In the high-speed mobile communication system based on OFDM, one party or both sides in communication are in high-speed mobile shape
State, high-speed mobile make signal generate Doppler frequency shift, and the transmission time of every frame all may be different, at this point, not only carrier wave can occur
Certain rate shift can also occur for frequency displacement, chip, and information frame length is caused to change, when frame length changes more than OFDM cyclic prefix energy
When the symbol timing error enough tolerated, it may appear that inter-symbol interference problem.
Summary of the invention
The purpose of the present invention is to provide a kind of wireless communications method, device, system, transmitting terminal and receiving ends, to improve
Frequency estimation accuracy is alleviated existing in the prior art as caused by high-speed mobile the technical issues of intersymbol interference.
The present invention provides a kind of wireless communications methods, applied to the transmitting terminal in wireless communication system, the method packet
It includes: obtaining messaging parameter, the messaging parameter includes position and movement speed and the wireless communication system of the transmitting terminal
The position and movement speed of the receiving end of system；It is calculated between the transmitting terminal and the receiving end according to the messaging parameter
Chip Doppler frequency shift；The target hair of the transmitting terminal is determined according to the chip Doppler frequency shift and preset standard speed
Transmission rate；Emit echo signal to be sent to the receiving end according to the target transmission rate, so that the receiving end is pressed
The echo signal is received according to the standard speed.
Further, the transmitting terminal and the receiving end include ground installation or satellite；Obtain the step of messaging parameter
Suddenly, comprising: if the transmitting terminal or the receiving end include ground installation, institute is obtained by GPS and/or Beidou Navigation System
State the position and movement speed of ground installation；If the transmitting terminal or the receiving end include satellite, obtained by satellite ephemeris
Take the position and movement speed of the satellite.
Further, the messaging parameter further includes communication pattern, and the communication pattern includes that many-one communicates, is one-to-many
Communication or point-to-point communication；It is more in the chip being calculated between the transmitting terminal and the receiving end according to the messaging parameter
Before general Le frequency displacement, the method also includes: judge whether the communication pattern is one-to-many communication；If not, described in executing
The step of chip Doppler frequency shift between the transmitting terminal and the receiving end is calculated according to the messaging parameter.
Further, how general the chip being calculated between the transmitting terminal and the receiving end according to the messaging parameter is
The step of strangling frequency displacement, comprising: according to the position and movement speed of the transmitting terminal, the position and movement speed of the receiving end,
The relative velocity of the transmitting terminal and the receiving end and the position line of the transmitting terminal and the receiving end is calculated
Vector；The included angle cosine value of the relative velocity and the position line vector is calculated；According to the included angle cosine value and
The chip Doppler frequency shift between the transmitting terminal and the receiving end is calculated in the relative velocity.
Further, the step of emitting echo signal to be sent to the receiving end according to the target transmission rate,
Include: by variable Rate FIR filter by the currently transmitted modifying rates of the transmitting terminal be the target transmission rate, and will
The echo signal is emitted with the target transmission rate to the receiving end；Wherein, the variable Rate FIR filter includes drawing
One of Ge Lang interpolation filter, third-order spline interpolation filter, fractional order sampling filter or a variety of combinations.
Further, more in the chip being calculated between the transmitting terminal and the receiving end according to the messaging parameter
Before general Le frequency displacement, the method also includes: according to the movement speed of the movement speed of the transmitting terminal and the receiving end, really
The relative velocity of the fixed transmitting terminal and the receiving end；Judge whether the size of the relative velocity is greater than preset rate threshold
Value；If so, it is more to execute the chip being calculated between the transmitting terminal and the receiving end according to the messaging parameter
The step of general Le frequency displacement.
Further, the coding mode of the echo signal includes convolutional code, Turbo code, low-density checksum LDPC
One of code, polarization code, RS code, linear block codes or a variety of combinations；The information that the echo signal is included includes text
One of word, audio, picture and video are a variety of.
The present invention also provides a kind of wireless communications methods, applied to the receiving end in wireless communication system, the method
It include: to obtain communication ginseng when the echo signal that the transmitting terminal for receiving the wireless communication system emits according to standard speed
Number；Wherein, the messaging parameter includes the position and movement speed of the transmitting terminal and the position and movement of the receiving end
Speed；The chip Doppler frequency shift between the transmitting terminal and the receiving end is calculated according to the messaging parameter；According to
The chip Doppler frequency shift and the standard speed determine the intended recipient rate of the receiving end；According to the intended recipient
Rate receives the echo signal.
The present invention provides a kind of wireless communication devices, applied to the transmitting terminal in wireless communication system, described device packet
Include: first obtains module, for obtaining messaging parameter, the messaging parameter include the transmitting terminal position and movement speed,
And the position and movement speed of the receiving end of the wireless communication system；First computing module, for being joined according to the communication
The chip Doppler frequency shift between the transmitting terminal and the receiving end is calculated in number；First determining module, for according to institute
It states chip Doppler frequency shift and preset standard speed determines the target transmission rate of the transmitting terminal；Transmitting module, for pressing
Emit echo signal to be sent to the receiving end according to the target transmission rate, so that the receiving end is according to the standard
Rate receives the echo signal.
The present invention also provides a kind of wireless communication devices, applied to the receiving end in wireless communication system, described device
It include: the second acquisition module, for working as the target for receiving the transmitting terminal of the wireless communication system and emitting according to standard speed
When signal, messaging parameter is obtained；Wherein, the messaging parameter includes the position and movement speed of the transmitting terminal and described
The position and movement speed of receiving end；Second computing module, for according to the messaging parameter be calculated the transmitting terminal with
Chip Doppler frequency shift between the receiving end；Second determining module, for according to the chip Doppler frequency shift and described
Standard speed determines the intended recipient rate of the receiving end；Receiving module, for receiving institute according to the intended recipient rate
State echo signal.
The present invention provides a kind of transmitting terminal, including memory, processor, being stored in the memory can be at the place
The computer program run on reason device, the processor realize the above-mentioned nothing applied to transmitting terminal when executing the computer program
Line communication means.
The present invention provides a kind of receiving end, including memory, processor, being stored in the memory can be at the place
The computer program run on reason device, the processor realize the above-mentioned nothing applied to receiving end when executing the computer program
Line communication means.
The present invention provides a kind of wireless communication systems, including above-mentioned transmitting terminal and above-mentioned receiving end, the transmitting
End is communicated to connect with the receiving end.
The present invention provides a kind of computer-readable medium of non-volatile program code that can be performed with processor, institutes
Stating program code makes the processor execute the above method.
In wireless communications method provided by the invention, device, system, transmitting terminal and receiving end, messaging parameter is obtained, according to
The chip Doppler frequency shift between transmitting terminal and receiving end is calculated in messaging parameter；According to chip Doppler frequency shift and standard speed
Rate determines the target transmission rate of transmitting terminal or the intended recipient rate of receiving end；Transmitting terminal is according to target transmission rate to reception
End emits echo signal to be sent, so that receiving end receives echo signal according to standard speed, alternatively, receiving end is according to target
Receiving velocity receives the echo signal that transmitting terminal emits according to standard speed.In this way in high-speed mobile transmitting terminal and/
Or receiving end, compared with the prior art in directly adopt standard speed carry out signal transmitting and reception, the present invention is by sending out
It penetrates end group and determines target transmission rate in chip Doppler frequency shift and standard speed, and carry out target according to target transmission rate
The transmitting of signal, or intended recipient rate is determined based on chip Doppler frequency shift and standard speed in receiving end, and according to
Intended recipient rate carries out the reception of echo signal, reduces the influence of Doppler frequency shift, reduces in signals transmission
The variation of information frame length, improves frequency estimation accuracy, to avoid intersymbol interference to a certain extent.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of flow diagram of wireless communications method provided in an embodiment of the present invention；
Fig. 2 is the flow diagram of another wireless communications method provided in an embodiment of the present invention；
Fig. 3 is the flow diagram of another wireless communications method provided in an embodiment of the present invention；
Fig. 4 is a kind of schematic diagram of one-to-many communication provided in an embodiment of the present invention；
Fig. 5 is a kind of schematic diagram of many-one communication provided in an embodiment of the present invention；
Fig. 6 is a kind of schematic diagram of point-to-point communication provided in an embodiment of the present invention；
Fig. 7 is the schematic diagram of another point-to-point communication provided in an embodiment of the present invention；
Fig. 8 is a kind of structural schematic diagram of wireless communication device provided in an embodiment of the present invention；
Fig. 9 is the structural schematic diagram of another wireless communication device provided in an embodiment of the present invention；
Figure 10 is the structural schematic diagram of another wireless communication device provided in an embodiment of the present invention；
Figure 11 is the structural schematic diagram of another wireless communication device provided in an embodiment of the present invention；
Figure 12 is a kind of structural schematic diagram of communication equipment provided in an embodiment of the present invention.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with embodiment, it is clear that described reality
Applying example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field
Art personnel every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
At present in the high-speed mobile communication system based on OFDM, the transmitting of signal is typically directly carried out using standard speed
And reception, and the high-speed mobile of one or both in communicating can make signal generate Doppler frequency shift, so as to cause intersymbol interference.
Based on this, a kind of wireless communications method, device, system, transmitting terminal and receiving end provided in an embodiment of the present invention can be alleviated existing
Have present in technology as caused by high-speed mobile the technical issues of intersymbol interference.
For convenient for understanding the present embodiment, first to a kind of wireless communications method disclosed in the embodiment of the present invention into
Row is discussed in detail.
A kind of flow diagram of wireless communications method shown in Figure 1, this method are applied in wireless communication system
Transmitting terminal, this method comprises the following steps:
Step S102 obtains messaging parameter, which includes the position and movement speed and channel radio of transmitting terminal
The position and movement speed of the receiving end of letter system.
Specifically, transmitting terminal and receiving end can be, but not limited to as ground installation or satellite, wherein ground installation can be with
It is divided into ground sending device and ground receiving equipment, satellite can be divided into satellite launch equipment and satellite receiving equipment, Ye Jifa
Penetrating end can be ground sending device or satellite launch equipment, and receiving end can be ground receiving equipment or satellite receiving equipment.
The position of transmitting terminal and the position of receiving end all can be position coordinates.
Optionally, if transmitting terminal or receiving end include ground installation, GPS (Global Positioning can be passed through
System, global positioning system) and/or Beidou Navigation System obtain ground installation position and movement speed；If transmitting terminal
Or receiving end includes satellite, and the position and movement speed of satellite is obtained by satellite ephemeris.Wherein, satellite ephemeris, also known as two
Row orbital data is the expression formula for describing space flight body position and speed.It should be noted that movement speed here
It is vector, therefore also referred to as velocity vector.
The chip Doppler frequency shift between transmitting terminal and receiving end is calculated according to above-mentioned messaging parameter by step S104.
It is alternatively possible to calculate the chip Doppler frequency shift between transmitting terminal and receiving end by following procedure: according to hair
The position and movement speed at end, the position and movement speed of receiving end are penetrated, the relative velocity of transmitting terminal and receiving end is calculated
And the position line vector of transmitting terminal and receiving end；The included angle cosine of the relative velocity and position line vector is calculated
Value；According to the included angle cosine value and relative velocity, the chip Doppler frequency shift between transmitting terminal and receiving end is calculated.
Specifically, the movement speed of transmitting terminal and the movement speed of receiving end are subjected to vector addition, obtain transmitting terminal with
The relative velocity of receiving end；The position coordinates of the position coordinates of transmitting terminal and receiving end are subtracted each other, transmitting terminal and receiving end are obtained
Position line vector.It utilizes vector angle formula (vector angle formula):Calculate relative velocity and the position
Set the included angle cosine value of line vector.Finally, according to Doppler shift formula:Transmission is calculated
Chip Doppler frequency shift f when rate is fd；Wherein,For the velocity vector (movement speed, similarly hereinafter) of transmitting terminal,To receive
The velocity vector at end, angle of the θ between electromagnetic wave incident direction (direction of position line vector) and the direction of relative velocity,
C is propagation velocity of electromagnetic wave.
Step S106 determines that the target of transmitting terminal sends speed according to above-mentioned chip Doppler frequency shift and preset standard speed
Rate.
The receiving velocity for enabling receiving end is standard speed, namely:
ft+fd=f0,
Wherein, ftFor the target transmission rate of transmitting terminal, fdFor chip Doppler frequency shift, f0For standard speed.Target is sent out
(f=f under transmission ratet) Doppler frequency shift bring above formula into after, target transmission rate can be solved are as follows:
Step S108 emits echo signal to be sent to receiving end according to above-mentioned target transmission rate, so that receiving end
Echo signal is received according to standard speed.
In some possible embodiments, in transmitting terminal, by variable Rate filter by the currently transmitted rate of transmitting terminal
It is revised as target transmission rate, and echo signal is emitted with the target transmission rate to receiving end.Wherein, variable Rate filter
It can be variable Rate FIR (Finite Impulse Response, there is limit for length's unit impulse response) filter, variable Rate FIR filter
Wave device includes one of Lagrange's interpolation filter, third-order spline interpolation filter, fractional order sampling filter or a variety of
Combination.In receiving end, since transmitting terminal has modified the transmission rate of echo signal in advance, under high dynamic scene, code
The Doppler frequency shift phenomenon of piece can be such that signal restores in receiving end to standard speed, thus receiving end can according to standard speed into
Row demodulation.It should be noted that the scope of protection of the present invention is not limited to this, in other embodiments, variable Rate FIR filter can
To use other kinds of filter as needed.
Wireless communications method provided in an embodiment of the present invention is suitable for sending the echo signal of a variety of coding modes, and the mesh
The information category that mark signal includes is extensive, for example, the coding mode of echo signal includes convolutional code, Turbo code, LDPC (Low-
Density Parity-check, low-density checksum) code, polarization code, RS (Reed-solomon, Reed-Solomon) code,
One of linear block codes or a variety of combinations；The information that echo signal is included includes in text, audio, picture and video
It is one or more.In addition, echo signal can be ofdm signal, or OFDMA (Orthogonal Frequency
Division Multiple Access, orthogonal frequency division multiple access) signal.Since ofdm signal is extremely sensitive to frequency departure, because
This receiving end generally requires complicated frequency offset calculation and correct algorithm, passes through modification OFDM rate (OFDM in advance in the present embodiment
The transmission rate of signal) the tracking process that can simplify receiving end, reduce the complexity and hardware spending of system.
In the embodiment of the present invention, messaging parameter is obtained, is calculated between transmitting terminal and receiving end according to messaging parameter
Chip Doppler frequency shift；The target transmission rate of transmitting terminal is determined according to chip Doppler frequency shift and preset standard speed；Hair
It penetrates end and emits echo signal to be sent to receiving end according to target transmission rate, so that receiving end receives mesh according to standard speed
Mark signal.In this way in high-speed mobile transmitting terminal and/or receiving end, compared with the prior art in directly adopt standard speed
Rate carries out the transmitting of signal, and the embodiment of the present invention is under the conditions of accurately space orientation and time service, by being based on code in transmitting terminal
Piece Doppler frequency shift and standard speed and determine target transmission rate, and according to target transmission rate carry out echo signal hair
It penetrates, reduces the influence of Doppler frequency shift, reduce the information frame length variation in signals transmission, improve Frequency Estimation essence
Degree, to avoid intersymbol interference to a certain extent.
The embodiment of the invention also provides another wireless communications method, this method is still applied in wireless communication system
Transmitting terminal, above-mentioned messaging parameter further includes communication pattern in this method.Compared with embodiment shown in FIG. 1, in this method also
The influence of communication pattern is considered, to reduce calculating cost.
The flow diagram of another wireless communications method shown in Figure 2, method includes the following steps:
Step S202, obtain messaging parameter, the messaging parameter include communication pattern, transmitting terminal position and movement speed,
And the position and movement speed of receiving end.
Above-mentioned communication pattern includes many-one communication, one-to-many communication or point-to-point communication, wherein many-one communication refers to more
A user sends, and a user receives；One-to-many communication refers to that a user sends, and multiple users receive；Point-to-point communication refers to one
A user sends, and a user receives.Many-one can use OFDMA when communicating, and when one-to-many communication or point-to-point communication can
To use OFDM.
Step S204 judges whether above-mentioned communication pattern is one-to-many communication.If so, executing step S206；If not,
Execute step S208 to step S212.
When communication pattern is one-to-many communication, according to the mode for changing transmission rate in transmitting terminal, then transmitting terminal is needed
The corresponding target transmission rate in each receiving end is calculated, calculating cost is higher, can not change in transmitting terminal based on this and send
Rate, and consider to change receiving velocity in receiving end, it is detailed in subsequent embodiment.Conversely, when communication pattern is that many-one communicates,
It is higher that cost is calculated when changing receiving velocity mode using receiving end, should change transmission rate namely step in transmitting terminal at this time
The mode of S208 to step S212.In addition, both modes are suitable for when communication pattern is One-to-one communication.
Step S206 emits ofdm signal to be sent to receiving end according to preset standard speed.
The chip Doppler frequency shift between transmitting terminal and receiving end is calculated according to above-mentioned messaging parameter by step S208.
Step S210 determines that the target of transmitting terminal sends speed according to above-mentioned chip Doppler frequency shift and preset standard speed
Rate.
Step S212 emits OFDMA signal to be sent to receiving end according to above-mentioned target transmission rate.
In addition, in order to reduce calculating cost, improving communication efficiency in some possible embodiments, step is being executed
Before S208, transmitting terminal and receiving end can also be determined first according to the movement speed of the movement speed of transmitting terminal and receiving end
Relative velocity；Judge whether the size of relative velocity is greater than preset rate-valve value；If so, thening follow the steps S208；If
It is no, then step S206.Rate-valve value can according to need setting, be not construed as limiting here.Namely only has while meeting communication pattern
The size for one-to-many communication and relative velocity is not greater than two conditions of preset rate-valve value, just executes step S208, needs
Illustrate, the two conditions execute sequence without successive.
In the embodiment of the present invention, under the conditions of accurately space orientation and time service, it is contemplated that communication pattern is to calculating cost
Influence, by receive and dispatch both ends (transmitting terminal and receiving end) velocity information and location information calculate in advance spreading rate offset,
Change ofdm signal/OFDMA signal rate in advance in transmitting terminal based on chip Doppler frequency shift and standard speed, so that receiving
End can demodulate all information in certain symbol timing error, avoid intersymbol interference phenomenon to a certain extent, from
And it realizes OFDM/OFDMA and communicates.
The embodiment of the invention also provides another wireless communications method, this method is applied to connecing in wireless communication system
Receiving end.The flow diagram of another wireless communications method shown in Figure 3, method includes the following steps:
Step S302 is obtained when the echo signal that the transmitting terminal for receiving wireless communication system emits according to standard speed
Take messaging parameter；Wherein, which includes the position and movement speed of transmitting terminal and the position and movement speed of receiving end
Degree.
The chip Doppler frequency shift between transmitting terminal and receiving end is calculated according to above-mentioned messaging parameter by step S304.
The detailed process of step S302 and step S304 are referred to step S102 and step S104 in above-described embodiment
Corresponding contents, which is not described herein again.
Step S306 determines the intended recipient rate of receiving end according to above-mentioned chip Doppler frequency shift and standard speed.
In transmitting terminal, according to standard speed f0Carry out signal transmitting.In receiving end, transmission rate (the i.e. mesh of echo signal
Mark receiving velocity) become f0+fd, wherein fdFor chip Doppler frequency shift.
Step S308 receives echo signal according to above-mentioned intended recipient rate.
In some possible embodiments, receiving end is believed before demodulated signal using variable Rate FIR filter modification target
Number receiving velocity, make receiving velocity by the f that is calculated in step S3060+fdIt is modified to standard speed f0, then according to mark
Quasi- rate demodulation signal.
It should be noted that the partial content of embodiment illustrated in fig. 3 can mutually join with the corresponding contents of previous embodiment
According to which is not described herein again.
In the embodiment of the present invention, when the echo signal that the transmitting terminal for receiving wireless communication system emits according to standard speed
When, obtain messaging parameter；The chip Doppler frequency shift between transmitting terminal and receiving end is calculated according to messaging parameter；According to code
Piece Doppler frequency shift and standard speed determine the intended recipient rate of receiving end；Echo signal is received according to intended recipient rate.
In this way in high-speed mobile transmitting terminal and/or receiving end, compared with the prior art in directly adopt standard speed progress
How general the reception of signal, the embodiment of the present invention be by being based on chip in receiving end under the conditions of accurately space orientation and time service
It strangles frequency displacement and standard speed and determines intended recipient rate, and carry out the reception of echo signal according to intended recipient rate, namely
By the signal rate arrived in receiving end corrected received, receiving end is enable accurately to receive demodulated signal, realizes OFDM/OFDMA
Communication, reduce the influence of Doppler frequency shift, reduce in signals transmission information frame length variation, improve frequency and estimate
Precision is counted, to avoid intersymbol interference to a certain extent.
In order to make it easy to understand, the embodiment of the present invention is each provided with corresponding example for three kinds of communication patterns, it below will ginseng
It is specifically described according to Fig. 4 to Fig. 7.
A kind of schematic diagram of one-to-many communication shown in Figure 4, communication pattern are one-to-many communication, the wireless communication system
System includes 1 satellite launch equipment A (transmitting user A), and 3 ground receiving equipments B, C, D (receive user B, receive user C, connect
Receive user D).High dynamic variable Rate ofdm communication may be implemented by following steps:
1) obtain messaging parameter: communication pattern be one-to-many communication, by GPS/ Beidou obtain B, C, D location information and
Velocity vectorThe location information and velocity vector of A are obtained by satellite ephemerisBe calculated A to B, C,
The distance vector of DPass through vector angle formula:Calculate distance vectorWith velocity vector and (relative velocity)Included angle cosine value cos θ1、
cosθ2、cosθ3。
2) the chip Doppler frequency shift of ofdm signal is calculated: Wherein f is standard speed, and c is propagation velocity of electromagnetic wave.
3) in transmitting terminal, A is encoding information, is being interweaved, after planisphere mapping and OFDM modulation, according to standard speed
F carries out signal transmitting.
4) in receiving end, B, C, D are utilized respectively variable Rate filter for the transmission rate of the ofdm signal received by f+
fAB、f+fAC、f+fADIt is modified to standard speed f.Then it is demodulated, demapping, deinterleaving, decoding.
A kind of schematic diagram of many-one communication shown in Figure 5, communication pattern are many-one communication, the wireless communication system
System includes 3 ground sending device A, B, C (transmitting user A, transmitting user B, transmitting user C), and 1 satellite receiving equipment D (connects
Receive user D).High dynamic variable Rate ofdm communication may be implemented by following steps:
1) obtain messaging parameter: communication pattern be many-one communicate, by GPS/ Beidou acquisition A, B, C location information and
Velocity vectorThe location information and velocity vector of D are obtained by satellite ephemerisA, B, C is calculated to arrive
The distance vector of DPass through vector angle formula:Calculate distance vectorWith velocity vector and Included angle cosine value cos θ1、cosθ2、cosθ3。
2) the chip Doppler frequency shift of ofdm signal is calculated: Wherein fA、fB、fCRespectively the OFDM of A, B, C emit speed
Rate (objective emission rate), c is propagation velocity of electromagnetic wave.
3) in transmitting terminal, A, B, C are encoding information, are being interweaved, after planisphere mapping and OFDM modulation, utilized respectively
Ofdm signal is revised as by variable Rate filter by standard speed f in advanceCarry out signal transmitting.
4) in receiving end, the transmission rate for the ofdm signal that D is received is standard speed f, and the OFDM received is believed
It number is demodulated according to standard speed f, demapping, deinterleaving, decoding.
A kind of schematic diagram of point-to-point communication shown in Figure 6, communication pattern are One-to-one communication, the wireless communication system
System includes 1 ground sending device A (transmitting user A), 1 ground receiving equipment B (receiving user B).It can by following steps
To realize high dynamic variable Rate ofdm communication:
1) obtain messaging parameter: communication pattern is One-to-one communication, and the location information and speed of A, B are obtained by GPS/ Beidou
Spend vectorThe distance vector of A to B is calculatedPass through vector angle formula:It calculates
Distance vectorWith velocity vector andIncluded angle cosine value cos θ.
2) in transmitting terminal, A is encoding information, is being interweaved, after planisphere mapping and OFDM modulation, according to standard speed
F carries out signal transmitting, and the Doppler frequency shift of ofdm signal is
3) in receiving end, B is using variable Rate filter by the transmission rate of the ofdm signal received by f+fABIt is modified to
Standard speed f.Then it is demodulated, demapping, deinterleaving, decoding.
It is the schematic diagram of another point-to-point communication provided in an embodiment of the present invention referring to Fig. 7, communication pattern is one-to-one
Communication, the wireless communication system include 1 ground sending device A (transmitting user A), and 1 ground receiving equipment B (receives user
B).High dynamic variable Rate ofdm communication may be implemented by following steps:
1) obtain messaging parameter: communication pattern is One-to-one communication, and the location information and speed of A, B are obtained by GPS/ Beidou
Spend vectorThe distance vector of A to B is calculatedPass through vector angle formula:It calculates
Distance vectorWith velocity vector andIncluded angle cosine value cos θ.
2) in transmitting terminal, ofdm signal is revised as by A using variable Rate filter by standard speed fCarry out signal transmitting.
3) in receiving end, the transmission rate for the ofdm signal that B is received is standard speed f, is carried out according to standard speed f
Demodulation, demapping, deinterleaving, decoding.
The embodiment of the invention also provides a kind of wireless communication devices, applied to the transmitting terminal in wireless communication system.Ginseng
A kind of structural schematic diagram of wireless communication device as shown in Figure 8, the wireless communication device include:
First obtain module 82, for obtaining messaging parameter, the messaging parameter include transmitting terminal position and movement speed,
And the position and movement speed of the receiving end of wireless communication system；
First computing module 84, the chip Doppler for being calculated according to messaging parameter between transmitting terminal and receiving end
Frequency displacement；
First determining module 86, for determining the target of transmitting terminal according to chip Doppler frequency shift and preset standard speed
Transmission rate；
Transmitting module 88, for emitting echo signal to be sent to receiving end according to target transmission rate, so as to receive
End receives echo signal according to standard speed.
Optionally, above-mentioned transmitting terminal and receiving end include ground installation or satellite；Above-mentioned first obtains module 82 specifically
For: if transmitting terminal or receiving end include ground installation, the position of ground installation is obtained by GPS and/or Beidou Navigation System
It sets and movement speed；If transmitting terminal or receiving end include satellite, the position and movement speed of satellite is obtained by satellite ephemeris.
Optionally, above-mentioned first computing module 84 is specifically used for: according to the position and movement speed of transmitting terminal, receiving end
Position and movement speed, the relative velocity and transmitting terminal and the position line of receiving end that transmitting terminal and receiving end is calculated are sweared
Amount；The included angle cosine value of the relative velocity and position line vector is calculated；According to the included angle cosine value and relative velocity, meter
Calculation obtains the chip Doppler frequency shift between transmitting terminal and receiving end.
Optionally, above-mentioned transmitting module 88 is specifically used for: by variable Rate FIR filter by the currently transmitted speed of transmitting terminal
Rate is revised as target transmission rate, and echo signal is emitted with target transmission rate to receiving end；Wherein, variable Rate FIR is filtered
Wave device includes one of Lagrange's interpolation filter, third-order spline interpolation filter, fractional order sampling filter or a variety of
Combination.
Optionally, the coding mode of above-mentioned echo signal include convolutional code, Turbo code, low-density checksum LDPC code,
One of polarization code, RS code, linear block codes or a variety of combinations；The information that echo signal is included include text, audio,
One of picture and video are a variety of.
In the embodiment of the present invention, first, which obtains module 82, obtains messaging parameter, and the first computing module 84 is according to messaging parameter
The chip Doppler frequency shift between transmitting terminal and receiving end is calculated；First determining module 86 according to chip Doppler frequency shift and
Preset standard speed determines the target transmission rate of transmitting terminal；Transmitting module 88 emits according to target transmission rate to receiving end
Echo signal to be sent, so that receiving end receives echo signal according to standard speed.Hair in this way for being in high-speed mobile
Penetrate end and/or receiving end, compared with the prior art in directly adopt the transmitting that standard speed carries out signal, the embodiment of the present invention exists
Accurately under the conditions of space orientation and time service, by determining target transmitting terminal is based on chip Doppler frequency shift and standard speed
Transmission rate, and according to the transmitting of target transmission rate progress echo signal, the influence of Doppler frequency shift is reduced, letter is reduced
Information frame length variation in number transmission process, improves frequency estimation accuracy, to avoid intersymbol interference to a certain extent.
In some possible embodiments, above-mentioned messaging parameter further includes communication pattern, and communication pattern includes that many-one is logical
Letter, one-to-many communication or point-to-point communication；The structural schematic diagram of another wireless communication device shown in Figure 9, Fig. 8's
On the basis of, above-mentioned apparatus further include:
First judgment module 92, for judging whether above-mentioned communication pattern is one-to-many communication；
Above-mentioned first computing module 84 is also used to: when the judging result of first judgment module 92 is no, according to above-mentioned logical
The chip Doppler frequency shift between transmitting terminal and receiving end is calculated in letter parameter.
Optionally, as shown in figure 9, above-mentioned apparatus further include:
Second judgment module 94, for determining transmitting terminal according to the movement speed of transmitting terminal and the movement speed of receiving end
With the relative velocity of receiving end；Judge whether the size of relative velocity is greater than preset rate-valve value；
Above-mentioned first computing module 84 is also used to: when the judging result of the second judgment module 94, which is, is, according to above-mentioned logical
The chip Doppler frequency shift between transmitting terminal and receiving end is calculated in letter parameter.
The technical effect and aforementioned applications of wireless communication device provided by the embodiment of the present invention, realization principle and generation
Identical in the wireless communications method embodiment of transmitting terminal, to briefly describe, Installation practice part does not refer to place, before can refer to
State corresponding contents in correlation method embodiment.
The embodiment of the invention also provides another wireless communication devices, applied to the receiving end in wireless communication system.
The structural schematic diagram of another wireless communication device shown in Figure 10, the wireless communication device include:
Second obtains module 102, for working as the mesh for receiving the transmitting terminal of wireless communication system and emitting according to standard speed
When marking signal, messaging parameter is obtained；Wherein, messaging parameter includes position and movement speed and the position of receiving end of transmitting terminal
It sets and movement speed；
Second computing module 104, it is how general for the chip between transmitting terminal and receiving end to be calculated according to messaging parameter
Strangle frequency displacement；
Second determining module 106, for determining the intended recipient of receiving end according to chip Doppler frequency shift and standard speed
Rate；
Receiving module 108, for receiving echo signal according to intended recipient rate.
In the embodiment of the present invention, the second acquisition module 102 is fast according to standard when the transmitting terminal for receiving wireless communication system
When the echo signal of rate transmitting, messaging parameter is obtained；Second computing module 104 is calculated transmitting terminal and connects according to messaging parameter
Chip Doppler frequency shift between receiving end；Second determining module 106 is determined according to chip Doppler frequency shift and standard speed and is received
The intended recipient rate at end；Receiving module 108 receives echo signal according to intended recipient rate.In this way for being in high-speed mobile
Transmitting terminal and/or receiving end, compared with the prior art in directly adopt standard speed carry out signal reception, the present invention implement
Example is in accurately space orientation and under the conditions of time service, by determining receiving end is based on chip Doppler frequency shift and standard speed
Intended recipient rate, and according to the reception of intended recipient rate progress echo signal, namely by being arrived in receiving end corrected received
Signal rate, so that receiving end is accurately received demodulated signal, realize the communication of OFDM/OFDMA, reduce Doppler frequency shift
Influence, reduce in signals transmission information frame length variation, frequency estimation accuracy is improved, thus to a certain extent
Avoid intersymbol interference.
In some possible embodiments, the structural schematic diagram of another wireless communication device shown in Figure 11,
On the basis of Figure 10, above-mentioned apparatus further include:
Third judgment module 112, for determining transmitting terminal according to the movement speed of transmitting terminal and the movement speed of receiving end
With the relative velocity of receiving end；Judge whether the size of relative velocity is greater than preset rate-valve value；
Above-mentioned second computing module 104 is also used to: when the judging result of third judgment module 112, which is, is, according to above-mentioned
The chip Doppler frequency shift between transmitting terminal and receiving end is calculated in messaging parameter.
The technical effect and aforementioned applications of wireless communication device provided by the embodiment of the present invention, realization principle and generation
Wireless communications method embodiment in receiving end is identical, and to briefly describe, Installation practice part does not refer to place, before can refer to
State corresponding contents in correlation method embodiment.
The embodiment of the invention also provides a kind of communication equipment (transmitting terminal or receiving ends), which includes memory
And processor, memory are used to store the program for supporting processor to execute wireless communications method provided by previous embodiment,
Processor is configurable for executing the program stored in memory.The communication equipment can also include communication interface, for
Other equipment or communication.
Referring to Figure 12, the embodiment of the present invention also provides a kind of communication equipment 100, comprising: processor 10, memory 11, always
Line 12 and communication interface 13, the processor 10, communication interface 13 and memory 11 are connected by bus 12；Processor 10 is used for
Execute the executable module stored in memory 11, such as computer program.
Wherein, memory 11 may include high-speed random access memory (RAM, RandomAccessMemory), can also
It can further include nonvolatile memory (non-volatile memory), for example, at least a magnetic disk storage.Pass through at least one
A communication interface 13 (can be wired or wireless) realizes the communication link between the system network element and at least one other network element
It connects, internet, wide area network, local network, Metropolitan Area Network (MAN) etc. can be used.
Bus 12 can be isa bus, pci bus or eisa bus etc..The bus can be divided into address bus, data
Bus, control bus etc..Only to be indicated with a four-headed arrow in Figure 12, it is not intended that an only bus convenient for indicating
Or a type of bus.
Wherein, memory 11 is for storing program, and the processor 10 executes the journey after receiving and executing instruction
Sequence, method performed by the device that the stream process that aforementioned any embodiment of the embodiment of the present invention discloses defines can be applied to handle
In device 10, or realized by processor 10.
Processor 10 may be a kind of IC chip, the processing capacity with signal.During realization, above-mentioned side
Each step of method can be completed by the integrated logic circuit of the hardware in processor 10 or the instruction of software form.Above-mentioned
Processor 10 can be general processor, including central processing unit (Central Processing Unit, abbreviation CPU), network
Processor (Network Processor, abbreviation NP) etc.；It can also be digital signal processor (Digital Signal
Processing, abbreviation DSP), specific integrated circuit (Application Specific Integrated Circuit, referred to as
ASIC), ready-made programmable gate array (Field-Programmable Gate Array, abbreviation FPGA) or other are programmable
Logical device, discrete gate or transistor logic, discrete hardware components.It may be implemented or execute in the embodiment of the present invention
Disclosed each method, step and logic diagram.General processor can be microprocessor or the processor is also possible to appoint
What conventional processor etc..The step of method in conjunction with disclosed in the embodiment of the present invention, can be embodied directly in hardware decoding processing
Device executes completion, or in decoding processor hardware and software module combination execute completion.Software module can be located at
Machine memory, flash memory, read-only memory, programmable read only memory or electrically erasable programmable memory, register etc. are originally
In the storage medium of field maturation.The storage medium is located at memory 11, and processor 10 reads the information in memory 11, in conjunction with
Its hardware completes the step of above method.
The embodiment of the invention also provides a kind of wireless communication system, the system include as above-described embodiment transmitting terminal and
Receiving end；Transmitting terminal and receiving end communicate to connect.
In addition, the embodiment of the invention also provides a kind of calculating of non-volatile program code that can be performed with processor
Machine readable medium, the program code make the wireless communications method of processor execution preceding method embodiment.
Unless specifically stated otherwise, the opposite step of the component and step that otherwise illustrate in these embodiments, digital table
It is not limit the scope of the invention up to formula and numerical value.
The flow chart and block diagram in the drawings show the productions of the method and computer program of multiple embodiments according to the present invention
The architecture, function and operation in the cards of product.In this regard, each box in flowchart or block diagram can represent one
A part of a module, section or code, a part of the module, section or code include one or more for real
The executable instruction of logic function as defined in existing.It should also be noted that in some implementations as replacements, it is marked in the box
Function can also occur in a different order than that indicated in the drawings.For example, two continuous boxes can actually substantially simultaneously
It executes capablely, they can also be executed in the opposite order sometimes, and this depends on the function involved.It is also noted that frame
The combination of figure and/or each box in flow chart and the box in block diagram and or flow chart, can be as defined in executing
Function or the dedicated hardware based system of movement are realized, or can be come using a combination of dedicated hardware and computer instructions
It realizes.
Wireless communications method, device provided by the embodiment of the present invention, system, transmitting terminal and the computer program of receiving end
Product, the computer readable storage medium including storing program code, the instruction that said program code includes can be used for executing
Previous methods method as described in the examples, specific implementation can be found in embodiment of the method, and details are not described herein.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in the executable non-volatile computer-readable storage medium of a processor.Based on this understanding, of the invention
Technical solution substantially the part of the part that contributes to existing technology or the technical solution can be with software in other words
The form of product embodies, which is stored in a storage medium, including some instructions use so that
One computer equipment (can be personal computer, server or the network equipment etc.) executes each embodiment institute of the present invention
State all or part of the steps of method.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-
Only Memory), random access memory (RAM, Random Access Memory), magnetic or disk etc. are various can be with
Store the medium of program code.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (14)
1. a kind of wireless communications method, which is characterized in that applied to the transmitting terminal in wireless communication system, which comprises
Messaging parameter is obtained, the messaging parameter includes the position and movement speed and the wireless communication of the transmitting terminal
The position and movement speed of the receiving end of system；
The chip Doppler frequency shift between the transmitting terminal and the receiving end is calculated according to the messaging parameter；
The target transmission rate of the transmitting terminal is determined according to the chip Doppler frequency shift and preset standard speed；
Emit echo signal to be sent to the receiving end according to the target transmission rate, so that the receiving end is according to institute
It states standard speed and receives the echo signal.
2. the method according to claim 1, wherein the transmitting terminal and the receiving end include ground installation
Or satellite；The step of obtaining messaging parameter, comprising:
If the transmitting terminal or the receiving end include ground installation, obtained describedly by GPS and/or Beidou Navigation System
The position and movement speed of face equipment；
If the transmitting terminal or the receiving end include satellite, the position and movement speed of the satellite is obtained by satellite ephemeris
Degree.
3. the method according to claim 1, wherein the messaging parameter further includes communication pattern, the communication
Mode includes many-one communication, one-to-many communication or point-to-point communication；
Before the chip Doppler frequency shift being calculated according to the messaging parameter between the transmitting terminal and the receiving end,
The method also includes:
Judge whether the communication pattern is one-to-many communication；
If not, it is more to execute the chip being calculated between the transmitting terminal and the receiving end according to the messaging parameter
The step of general Le frequency displacement.
4. the method according to claim 1, wherein according to the messaging parameter be calculated the transmitting terminal with
The step of chip Doppler frequency shift between the receiving end, comprising:
According to the position and movement speed of the transmitting terminal, the position and movement speed of the receiving end, the hair is calculated
Penetrate end and the relative velocity of the receiving end and the position line vector of the transmitting terminal and the receiving end；
The included angle cosine value of the relative velocity and the position line vector is calculated；
According to the included angle cosine value and the relative velocity, the chip between the transmitting terminal and the receiving end is calculated
Doppler frequency shift.
5. the method according to claim 1, wherein emitting according to the target transmission rate to the receiving end
The step of echo signal to be sent, comprising:
By variable Rate FIR filter by the currently transmitted modifying rates of the transmitting terminal be the target transmission rate, and will
The echo signal is emitted with the target transmission rate to the receiving end；
Wherein, the variable Rate FIR filter includes Lagrange's interpolation filter, third-order spline interpolation filter, fractional order
One of sampling filter or a variety of combinations.
6. the method according to claim 1, wherein the transmitting terminal is calculated according to the messaging parameter
Before chip Doppler frequency shift between the receiving end, the method also includes:
According to the movement speed of the movement speed of the transmitting terminal and the receiving end, the transmitting terminal and the receiving end are determined
Relative velocity；
Judge whether the size of the relative velocity is greater than preset rate-valve value；
If so, it is more to execute the chip being calculated between the transmitting terminal and the receiving end according to the messaging parameter
The step of general Le frequency displacement.
7. the method according to claim 1, wherein the coding mode of the echo signal include convolutional code,
One of Turbo code, low-density checksum LDPC code, polarization code, RS code, linear block codes or a variety of combinations；It is described
The information that echo signal is included includes one of text, audio, picture and video or a variety of.
8. a kind of wireless communications method, which is characterized in that applied to the receiving end in wireless communication system, which comprises
When the echo signal that the transmitting terminal for receiving the wireless communication system emits according to standard speed, communication ginseng is obtained
Number；Wherein, the messaging parameter includes the position and movement speed of the transmitting terminal and the position and movement of the receiving end
Speed；
The chip Doppler frequency shift between the transmitting terminal and the receiving end is calculated according to the messaging parameter；
The intended recipient rate of the receiving end is determined according to the chip Doppler frequency shift and the standard speed；
The echo signal is received according to the intended recipient rate.
9. a kind of wireless communication device, which is characterized in that applied to the transmitting terminal in wireless communication system, described device includes:
First obtains module, for obtaining messaging parameter, the messaging parameter include the transmitting terminal position and movement speed,
And the position and movement speed of the receiving end of the wireless communication system；
First computing module, the chip for being calculated according to the messaging parameter between the transmitting terminal and the receiving end
Doppler frequency shift；
First determining module, for determining the mesh of the transmitting terminal according to the chip Doppler frequency shift and preset standard speed
Mark transmission rate；
Transmitting module, for emitting echo signal to be sent to the receiving end according to the target transmission rate, so that institute
It states receiving end and receives the echo signal according to the standard speed.
10. a kind of wireless communication device, which is characterized in that applied to the receiving end in wireless communication system, described device includes:
Second obtains module, for believing when the transmitting terminal for receiving the wireless communication system according to the target that standard speed emits
Number when, obtain messaging parameter；Wherein, the messaging parameter includes the position and movement speed of the transmitting terminal and described connects
The position and movement speed of receiving end；
Second computing module, the chip for being calculated according to the messaging parameter between the transmitting terminal and the receiving end
Doppler frequency shift；
Second determining module, for determining the target of the receiving end according to the chip Doppler frequency shift and the standard speed
Receiving velocity；
Receiving module, for receiving the echo signal according to the intended recipient rate.
11. a kind of transmitting terminal, including memory, processor, be stored in the memory to run on the processor
Computer program, which is characterized in that the processor realizes any one of claim 1-7 institute when executing the computer program
The method stated.
12. a kind of receiving end, including memory, processor, be stored in the memory to run on the processor
Computer program, which is characterized in that the processor realizes method according to any one of claims 8 when executing the computer program.
13. a kind of wireless communication system, which is characterized in that including transmitting terminal as claimed in claim 11 and such as claim 12
The receiving end, the transmitting terminal and the receiving end communicate to connect.
14. a kind of computer-readable medium for the non-volatile program code that can be performed with processor, which is characterized in that described
Program code makes the processor perform claim require any the method or claim 8 the method in 1-7.
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