CN110266370B - Wireless communication method, related device, system and computer readable medium - Google Patents
Wireless communication method, related device, system and computer readable medium Download PDFInfo
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Abstract
The invention provides a wireless communication method, a device, a system, a transmitting end and a receiving end, which relate to the technical field of wireless communication, and the method comprises the following steps: acquiring communication parameters, and calculating to obtain chip Doppler frequency shift between a transmitting end and a receiving end according to the communication parameters; determining a target sending rate of a transmitting end or a target receiving rate of a receiving end according to the chip Doppler frequency shift and the standard rate; the transmitting terminal transmits a target signal to be transmitted to the receiving terminal according to a target transmitting rate, so that the receiving terminal receives the target signal according to a standard rate, or the receiving terminal receives the target signal transmitted by the transmitting terminal according to the standard rate according to a target receiving rate. Therefore, for the transmitting end and/or the receiving end which moves at a high speed, the target sending rate is adopted at the transmitting end to transmit signals or the target receiving rate is adopted at the receiving end to receive the signals, so that the influence of Doppler frequency shift is reduced, the frequency estimation precision is improved, and intersymbol interference is avoided to a certain extent.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a wireless communication method, apparatus, system, transmitting end, and receiving end.
Background
OFDM (Orthogonal Frequency Division Multiplexing) technology has been widely used in recent years, and OFDM can tolerate a certain symbol timing error due to the introduction of a cyclic prefix. In the OFDM-based communication system, various techniques are used for the synchronization and tracking process of signals, for example, a receiving end may detect a frame synchronization sequence by using a correlation method, and determine a starting position of each standard time slot; the arrival time of the frame header can be roughly estimated by means of the accurate space-time reference of the transmitting side and the receiving side, and the starting position of the standard time slot can be determined.
In a high-speed mobile communication system based on OFDM, one or both of the communication is in a high-speed moving state, the high-speed moving causes Doppler frequency shift to signals, the transmission time of each frame may be different, at this time, not only the carrier frequency shift but also a certain rate shift of chips may occur, which results in a change of information frame length, and when the change of frame length exceeds a symbol timing error that can be tolerated by an OFDM cyclic prefix, the problem of inter-code crosstalk may occur.
Disclosure of Invention
The invention aims to provide a wireless communication method, a wireless communication device, a wireless communication system, a wireless communication transmitting end and a wireless communication receiving end, so that the frequency estimation precision is improved, and the technical problem of intersymbol interference caused by high-speed movement in the prior art is solved.
The invention provides a wireless communication method, which is applied to a transmitting terminal in a wireless communication system and comprises the following steps: acquiring communication parameters, wherein the communication parameters comprise the position and the moving speed of the transmitting end and the position and the moving speed of the receiving end of the wireless communication system; calculating to obtain the chip Doppler frequency shift between the transmitting end and the receiving end according to the communication parameters; determining the target sending rate of the transmitting end according to the chip Doppler frequency shift and a preset standard rate; and transmitting a target signal to be transmitted to the receiving end according to the target transmission rate so that the receiving end receives the target signal according to the standard rate.
Further, the transmitting end and the receiving end both comprise ground equipment or a satellite; the step of obtaining communication parameters comprises: if the transmitting end or the receiving end comprises ground equipment, the position and the moving speed of the ground equipment are obtained through a GPS and/or a Beidou navigation system; and if the transmitting end or the receiving end comprises a satellite, acquiring the position and the moving speed of the satellite through satellite ephemeris.
Further, the communication parameters further include a communication mode, the communication mode including many-to-one communication, one-to-many communication, or peer-to-peer communication; before calculating the chip doppler shift between the transmitting end and the receiving end according to the communication parameters, the method further comprises: judging whether the communication mode is one-to-many communication; and if not, executing the step of calculating to obtain the code chip Doppler frequency shift between the transmitting end and the receiving end according to the communication parameters.
Further, the step of calculating the chip doppler shift between the transmitting end and the receiving end according to the communication parameters includes: calculating the relative speed between the transmitting end and the receiving end and the position connecting line vector between the transmitting end and the receiving end according to the position and the moving speed of the transmitting end and the position and the moving speed of the receiving end; calculating to obtain a cosine value of an included angle between the relative speed and the position connecting line vector; and calculating to obtain the chip Doppler frequency shift between the transmitting end and the receiving end according to the cosine value of the included angle and the relative speed.
Further, the step of transmitting the target signal to be transmitted to the receiving end according to the target transmission rate includes: modifying the current sending rate of the sending end into the target sending rate through a variable rate FIR filter, and sending the target signal to the receiving end at the target sending rate; wherein the variable rate FIR filter comprises a combination of one or more of a Lagrange interpolation filter, a third order spline interpolation filter, a fractional order sampling filter.
Further, before calculating the chip doppler shift between the transmitting end and the receiving end according to the communication parameters, the method further includes: determining the relative speed of the transmitting end and the receiving end according to the moving speed of the transmitting end and the moving speed of the receiving end; judging whether the relative speed is larger than a preset speed threshold value or not; if yes, the step of calculating the code chip Doppler frequency shift between the transmitting end and the receiving end according to the communication parameters is executed.
Furthermore, the coding mode of the target signal comprises one or more combinations of convolutional code, Turbo code, low-density parity check L DPC code, polarization code, RS code and linear block code, and the information contained in the target signal comprises one or more of characters, audio, pictures and video.
The invention also provides a wireless communication method, which is applied to a receiving end in a wireless communication system and comprises the following steps: when a target signal transmitted by a transmitting terminal of the wireless communication system according to a standard rate is received, acquiring communication parameters; wherein the communication parameters comprise the position and the moving speed of the transmitting terminal and the position and the moving speed of the receiving terminal; calculating to obtain the chip Doppler frequency shift between the transmitting end and the receiving end according to the communication parameters; determining a target receiving rate of the receiving end according to the chip Doppler frequency shift and the standard rate; and receiving the target signal according to the target receiving rate.
The invention provides a wireless communication device, which is applied to a transmitting terminal in a wireless communication system, and comprises: a first obtaining module, configured to obtain communication parameters, where the communication parameters include a position and a moving speed of the transmitting end, and a position and a moving speed of a receiving end of the wireless communication system; the first calculation module is used for calculating and obtaining the chip Doppler frequency shift between the transmitting end and the receiving end according to the communication parameters; a first determining module, configured to determine a target sending rate of the transmitting end according to the chip doppler shift and a preset standard rate; and the transmitting module is used for transmitting a target signal to be transmitted to the receiving end according to the target transmission rate so that the receiving end receives the target signal according to the standard rate.
The invention also provides a wireless communication device, which is applied to a receiving end in a wireless communication system, and the device comprises: the second acquisition module is used for acquiring communication parameters when receiving a target signal transmitted by a transmitting terminal of the wireless communication system according to a standard rate; wherein the communication parameters comprise the position and the moving speed of the transmitting terminal and the position and the moving speed of the receiving terminal; the second calculation module is used for calculating and obtaining the chip Doppler frequency shift between the transmitting end and the receiving end according to the communication parameters; a second determining module, configured to determine a target receiving rate of the receiving end according to the chip doppler shift and the standard rate; and the receiving module is used for receiving the target signal according to the target receiving rate.
The invention provides a transmitting terminal, which comprises a memory and a processor, wherein a computer program capable of running on the processor is stored in the memory, and the processor executes the computer program to realize the wireless communication method applied to the transmitting terminal.
The invention provides a receiving end, which comprises a memory and a processor, wherein a computer program capable of running on the processor is stored in the memory, and the processor executes the computer program to realize the wireless communication method applied to the receiving end.
The invention provides a wireless communication system which comprises the transmitting end and the receiving end, wherein the transmitting end is in communication connection with the receiving end.
The invention provides a computer readable medium having non-volatile program code executable by a processor, the program code causing the processor to perform the above method.
In the wireless communication method, the device and the system, the transmitting terminal and the receiving terminal, provided by the invention, communication parameters are obtained, and the chip Doppler frequency shift between the transmitting terminal and the receiving terminal is obtained through calculation according to the communication parameters; determining a target sending rate of a transmitting end or a target receiving rate of a receiving end according to the chip Doppler frequency shift and the standard rate; the transmitting terminal transmits a target signal to be transmitted to the receiving terminal according to a target transmitting rate, so that the receiving terminal receives the target signal according to a standard rate, or the receiving terminal receives the target signal transmitted by the transmitting terminal according to the standard rate according to a target receiving rate. Compared with the prior art that the standard rate is directly adopted for transmitting and receiving signals at a transmitting end and/or a receiving end which moves at a high speed, the method and the device determine the target transmitting rate on the basis of the chip Doppler shift and the standard rate at the transmitting end, transmit the target signals according to the target transmitting rate, or determine the target receiving rate on the basis of the chip Doppler shift and the standard rate at the receiving end, and receive the target signals according to the target receiving rate, thereby reducing the influence of the Doppler shift, reducing the variation of the information frame length in the signal transmission process, improving the frequency estimation precision and avoiding the intersymbol interference to a certain extent.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart illustrating a wireless communication method according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating another wireless communication method according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating another wireless communication method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of one-to-many communication according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a many-to-one communication according to an embodiment of the present invention;
fig. 6 is a schematic diagram of peer-to-peer communication according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of another peer-to-peer communication scheme provided by an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a wireless communication device according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another wireless communication apparatus according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of another wireless communication device according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of another wireless communication device according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a communication device according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the high-speed mobile communication system based on OFDM, the standard rate is usually used directly for transmitting and receiving signals, and the high-speed movement of one or both of the communication causes doppler shift of the signals, thereby causing intersymbol interference. Based on this, the wireless communication method, apparatus, system, transmitting end and receiving end provided in the embodiments of the present invention can alleviate the technical problem of inter-code crosstalk caused by high-speed movement in the prior art.
For the convenience of understanding the present embodiment, a wireless communication method disclosed in the present embodiment will be described in detail first.
Referring to fig. 1, a flow chart of a wireless communication method is shown, the method is applied to a transmitting end in a wireless communication system, and the method includes the following steps:
step S102, obtaining communication parameters, wherein the communication parameters comprise the position and the moving speed of a transmitting end and the position and the moving speed of a receiving end of the wireless communication system.
Specifically, both the transmitting end and the receiving end may be, but not limited to, ground devices or satellites, where the ground devices may be divided into ground transmitting devices and ground receiving devices, and the satellites may be divided into satellite transmitting devices and satellite receiving devices, that is, the transmitting end may be a ground transmitting device or a satellite transmitting device, and the receiving end may be a ground receiving device or a satellite receiving device. The position of the transmitting end and the position of the receiving end can be position coordinates.
Optionally, if the transmitting end or the receiving end includes a ground device, the position and the moving speed of the ground device may be obtained through a GPS (Global positioning system) and/or a beidou navigation system; if the transmitting end or the receiving end comprises the satellite, the position and the moving speed of the satellite are acquired through satellite ephemeris. The satellite ephemeris, also called two-row orbit data, is an expression for describing the position and velocity of the space vehicle. Here, the moving speed is also referred to as a velocity vector because it is a vector.
Step S104, calculating according to the communication parameters to obtain the code chip Doppler frequency shift between the transmitting end and the receiving end.
Alternatively, the chip doppler shift between the transmitting end and the receiving end can be calculated by the following procedure: calculating the relative speed of the transmitting end and the receiving end and the position connecting line vector of the transmitting end and the receiving end according to the position and the moving speed of the transmitting end and the position and the moving speed of the receiving end; calculating to obtain the cosine value of the included angle of the relative speed and the position connecting line vector; and calculating to obtain the chip Doppler frequency shift between the transmitting end and the receiving end according to the cosine value and the relative speed of the included angle.
Specifically, the moving speed of the transmitting end and the moving speed of the receiving end are subjected to vector addition to obtain the relative speed of the transmitting end and the receiving end; and subtracting the position coordinate of the transmitting end from the position coordinate of the receiving end to obtain the position connecting line vector of the transmitting end and the receiving end. Using the vector angle formula (vector angle formula):
and calculating the cosine value of the included angle between the relative speed and the position connecting line vector. And finally, according to a Doppler frequency shift formula:
calculating to obtain the chip Doppler frequency shift f when the sending rate is fd(ii) a Wherein,
is a transmitting endVelocity vector (moving velocity, the same applies hereinafter),
theta is the angle between the incident direction of the electromagnetic wave (the direction of the position connecting line vector) and the direction of the relative speed, and c is the propagation speed of the electromagnetic wave.
And step S106, determining the target sending rate of the transmitting end according to the chip Doppler frequency shift and the preset standard rate.
Let the receiving rate of the receiving end be a standard rate, that is:
ft+fd=f0，
wherein f istTarget sending rate, f, for the transmitting enddIs chip Doppler shift, f0Is the standard rate. Target sending rate (f = f)t) After the doppler shift is substituted into the above formula, the target transmission rate can be solved as follows:
step S108, transmitting the target signal to be transmitted to the receiving end according to the target transmission rate, so that the receiving end receives the target signal according to the standard rate.
In some possible embodiments, at the transmitting end, the current sending rate of the transmitting end is modified to the target sending rate by the variable rate filter, and the target signal is sent to the receiving end at the target sending rate. The variable rate filter may be a variable rate FIR (Finite Impulse Response) filter, and the variable rate FIR filter includes one or more of a lagrange interpolation filter, a third-order spline interpolation filter, and a fractional order sampling filter. At the receiving end, because the transmitting end modifies the sending rate of the target signal in advance, the doppler shift phenomenon of the chip can restore the signal to the standard rate at the receiving end in a high dynamic scene, so that the receiving end can demodulate according to the standard rate. It should be noted that the scope of the present invention is not limited thereto, and in other embodiments, the variable rate FIR filter may adopt other types of filters as needed.
The wireless communication method provided by the embodiment of the present invention is suitable for transmitting target signals of Multiple coding schemes, and the target signals include a wide variety of information, for example, the coding scheme of the target signals includes one or a combination of Multiple of convolutional codes, Turbo codes, L DPC (L ow-dense Parity-check) codes, polarization codes, RS (Reed-solomon) codes, and linear block codes, and the information included in the target signals includes one or Multiple of characters, audio, pictures, and videos.
In the embodiment of the invention, communication parameters are obtained, and the chip Doppler frequency shift between a transmitting end and a receiving end is obtained through calculation according to the communication parameters; determining a target sending rate of a transmitting end according to the chip Doppler frequency shift and a preset standard rate; the transmitting terminal transmits a target signal to be transmitted to the receiving terminal according to the target transmission rate, so that the receiving terminal receives the target signal according to the standard rate. Compared with the prior art that the signal is directly transmitted at the standard rate, the transmitting end and/or the receiving end which move at high speed determine the target transmitting rate on the basis of the chip Doppler frequency shift and the standard rate at the transmitting end under the condition of accurate space positioning and time service, and transmit the target signal according to the target transmitting rate, so that the influence of the Doppler frequency shift is reduced, the change of the information frame length in the signal transmission process is reduced, the frequency estimation precision is improved, and the intersymbol interference is avoided to a certain extent.
The embodiment of the invention also provides another wireless communication method, which is still applied to a transmitting end in a wireless communication system, wherein the communication parameters further comprise a communication mode. Compared with the embodiment shown in fig. 1, the method also takes the influence of the communication mode into consideration to reduce the calculation cost.
Referring to fig. 2, another wireless communication method is shown in a flowchart, the method comprising the steps of:
step S202, communication parameters are obtained, and the communication parameters comprise a communication mode, the position and the moving speed of a transmitting end, and the position and the moving speed of a receiving end.
The communication mode comprises many-to-one communication, one-to-many communication or point-to-point communication, wherein the many-to-one communication refers to the transmission of a plurality of users and the reception of one user; one-to-many communication means one user to transmit and a plurality of users to receive; point-to-point communication refers to one user transmitting and one user receiving. OFDMA may be used for many-to-one communication, and OFDM may be used for one-to-many or point-to-point communication.
Step S204, judging whether the communication mode is one-to-many communication. If yes, go to step S206; if not, step S208 to step S212 are executed.
When the communication mode is one-to-many communication, if a mode of changing the sending rate at the sending end is adopted, the sending end needs to calculate the target sending rate corresponding to each receiving end, the calculation cost is high, and based on the calculation cost, the sending rate can be not changed at the sending end, but the receiving rate can be changed at the receiving end, which is described in the following embodiments. On the contrary, when the communication mode is many-to-one communication, the calculation cost is high when the receiving end changes the receiving rate, and at this time, the transmitting end should change the transmitting rate, that is, the method from step S208 to step S212. In addition, both of these methods are suitable when the communication mode is one-to-one communication.
Step S206, transmitting the OFDM signal to be transmitted to the receiving end according to a preset standard rate.
Step S208, calculating to obtain the chip doppler frequency shift between the transmitting end and the receiving end according to the communication parameters.
Step S210, determining a target transmission rate of the transmitting end according to the chip doppler shift and a preset standard rate.
Step S212, transmitting the OFDMA signal to be transmitted to the receiving end according to the target transmission rate.
In addition, in some possible embodiments, in order to reduce the calculation cost and improve the communication efficiency, before performing step S208, the relative speed between the transmitting end and the receiving end may be determined according to the moving speed of the transmitting end and the moving speed of the receiving end; judging whether the magnitude of the relative speed is larger than a preset speed threshold value or not; if yes, go to step S208; if not, step S206. The rate threshold may be set as desired, and is not limited herein. That is, step S208 is executed only when two conditions that the communication mode is not one-to-many communication and the relative speed is greater than the preset speed threshold are simultaneously satisfied, it should be noted that the two conditions are not in the execution sequence.
In the embodiment of the invention, under the conditions of accurate space positioning and time service, the influence of a communication mode on the calculation cost is considered, the chip rate offset is calculated in advance through the speed information and the position information of the transmitting end and the receiving end, and the rate of the OFDM signal/OFDMA signal is changed in advance at the transmitting end based on the chip Doppler shift and the standard rate, so that the receiving end can demodulate all information within a certain symbol timing error, and the intersymbol interference phenomenon is avoided to a certain extent, thereby realizing OFDM/OFDMA communication.
The embodiment of the invention also provides another wireless communication method which is applied to a receiving end in a wireless communication system. Referring to fig. 3, another wireless communication method is shown in a flowchart, the method comprising the steps of:
step S302, when receiving a target signal transmitted by a transmitting terminal of a wireless communication system according to a standard rate, acquiring communication parameters; wherein the communication parameters include the position and moving speed of the transmitting end, and the position and moving speed of the receiving end.
Step S304, calculating the chip doppler frequency shift between the transmitting end and the receiving end according to the communication parameters.
The specific processes of step S302 and step S304 may refer to the corresponding contents of step S102 and step S104 in the foregoing embodiments, and are not described herein again.
Step S306, determining the target receiving rate of the receiving end according to the chip Doppler shift and the standard rate.
At the transmitting end, according to a standard rate f0And carrying out signal transmission. At the receiving end, the transmission rate of the target signal (i.e., the target receiving rate) becomes f0+fdWherein f isdIs the chip doppler shift.
Step S308, receiving the target signal according to the target receiving rate.
In some possible embodiments, the receiving end modifies the receiving rate of the target signal by using a variable rate FIR filter before demodulating the signal, so that the receiving rate is determined by f calculated in step S3060+fdCorrected to standard rate f0And then demodulates the signal at the standard rate.
It should be noted that, part of the contents of the embodiment shown in fig. 3 may be referred to the corresponding contents of the foregoing embodiments, and are not described herein again.
In the embodiment of the invention, when a target signal transmitted by a transmitting terminal of a wireless communication system according to a standard rate is received, communication parameters are obtained; calculating according to the communication parameters to obtain the chip Doppler frequency shift between the transmitting end and the receiving end; determining the target receiving rate of a receiving end according to the chip Doppler frequency shift and the standard rate; a target signal is received at a target reception rate. Compared with the prior art that the signal is directly received at the standard speed, the transmitting end and/or the receiving end which move at a high speed, the receiving end and the receiving end determine the target receiving speed based on the chip Doppler frequency shift and the standard speed, and receive the target signal according to the target receiving speed, namely, the receiving end corrects the received signal speed, so that the receiving end can accurately receive and demodulate the signal, the OFDM/OFDMA communication is realized, the influence of the Doppler frequency shift is reduced, the information frame length change in the signal transmission process is reduced, the frequency estimation precision is improved, and the intersymbol interference is avoided to a certain extent.
For ease of understanding, the embodiments of the present invention provide corresponding examples for all three communication modes, and will be specifically described below with reference to fig. 4 to 7.
Referring to fig. 4, a diagram of one-to-many communication mode is shown, the wireless communication system includes 1 satellite transmitting device a (transmitting user a), and 3 terrestrial receiving devices B, C, D (receiving user B, receiving user C, receiving user D). High dynamic variable rate OFDM communication can be achieved by:
1) acquiring communication parameters: the communication mode is one-to-many communication, and the position information and the velocity vector of B, C, D are obtained through GPS/Beidou
Obtaining position information and velocity vector of A through satellite ephemeris
Calculating to obtain a distance vector from A to B, C, D
By the formula of the vector angle:
calculating a distance vector
Sum of velocity vectors (relative velocity)
Cosine value of (cos θ)1、cosθ2、cosθ3。
2) Calculating chip doppler shift of OFDM signal:
where f is the standard velocity and c is the electromagnetic wave propagation velocity.
3) At a transmitting end, A carries out signal transmission according to a standard rate f after coding, interleaving, constellation mapping and OFDM modulation are carried out on information.
4) At the receiving end, B, C, D uses variable rate filters to adjust the transmission rate of the received OFDM signal from f + fAB、f+fAC、f+fADThe correction is to the standard rate f. Then, demodulation, demapping, deinterleaving, and decoding are performed.
Referring to fig. 5, a diagram of a many-to-one communication mode is shown, and the wireless communication system includes 3 terrestrial transmitting devices A, B, C (transmitting user a, transmitting user B, and transmitting user C) and 1 satellite receiving device D (receiving user D). High dynamic variable rate OFDM communication can be achieved by:
1) acquiring communication parameters: the communication mode is many-to-one communication, and the position information and the speed vector of A, B, C are obtained through GPS/Beidou
Obtaining position information and velocity vector of D through satellite ephemeris
The distance vector from A, B, C to D is calculated
By the formula of the vector angle:
calculating a distance vector
And the sum of velocity vectors
Cosine value of (cos θ)1、cosθ2、cosθ3。
2) Calculating chip doppler shift of OFDM signal:
wherein f isA、fB、fCThe OFDM transmission rates (target transmission rates) of A, B, C, respectively, c is the electromagnetic wave propagation speed.
3) At the transmitting end, A, B, C the OFDM signal is modified from the standard rate f to the OFDM signal in advance by using a variable rate filter after the information is coded, interleaved, mapped to the constellation diagram and modulated by OFDM
And carrying out signal transmission.
4) At the receiving end, the transmission rate of the received OFDM signal is the standard rate f, and the received OFDM signal is demodulated, demapped, deinterleaved, and decoded according to the standard rate f.
Referring to fig. 6, a schematic diagram of peer-to-peer communication is shown, in which the communication mode is one-to-one communication, and the wireless communication system includes 1 terrestrial transmitting device a (transmitting user a) and 1 terrestrial receiving device B (receiving user B). High dynamic variable rate OFDM communication can be achieved by:
1) acquiring communication parameters: the communication mode is one-to-one communication, and the position information and the speed vector of A, B are obtained through GPS/Beidou
Calculating to obtain the distance vector from A to B
By the formula of the vector angle:
calculating a distance vector
And the sum of velocity vectors
Cosine of the angle cos θ.
2) At a transmitting end, A carries out signal transmission according to a standard rate f after coding, interleaving, constellation mapping and OFDM modulation are carried out on information, and the Doppler frequency shift of OFDM signals is
3) At the receiving end, B uses a variable rate filter to change the transmission rate of the received OFDM signal from f + fABThe correction is to the standard rate f. Then, demodulation, demapping, deinterleaving, and decoding are performed.
Referring to fig. 7, a schematic diagram of another peer-to-peer communication provided by the embodiment of the present invention, a communication mode is one-to-one communication, and the wireless communication system includes 1 terrestrial transmitting device a (transmitting user a) and 1 terrestrial receiving device B (receiving user B). High dynamic variable rate OFDM communication can be achieved by:
1) acquiring communication parameters: the communication mode is one-to-one communication, and the position information and the speed vector of A, B are obtained through GPS/Beidou
Calculating to obtain the distance vector from A to B
By the formula of the vector angle:
calculating a distance vector
And the sum of velocity vectors
Cosine of the angle cos θ.
2) At the transmitting end, A modifies the OFDM signal from the standard rate f to the standard rate f by using a variable rate filter
And carrying out signal transmission.
3) At the receiving end, the transmission rate of the OFDM signal received by B is the standard rate f, and demodulation, demapping, deinterleaving, and decoding are performed according to the standard rate f.
The embodiment of the invention also provides a wireless communication device which is applied to the transmitting terminal in the wireless communication system. Referring to fig. 8, a schematic structural diagram of a wireless communication device is shown, the wireless communication device includes:
a first obtaining module 82, configured to obtain communication parameters, where the communication parameters include a position and a moving speed of a transmitting end, and a position and a moving speed of a receiving end of a wireless communication system;
a first calculating module 84, configured to calculate, according to the communication parameter, a chip doppler frequency shift between the transmitting end and the receiving end;
a first determining module 86, configured to determine a target sending rate of a sending end according to the chip doppler shift and a preset standard rate;
the transmitting module 88 is configured to transmit a target signal to be transmitted to a receiving end according to a target transmission rate, so that the receiving end receives the target signal according to a standard rate.
Optionally, the transmitting end and the receiving end both include ground equipment or a satellite; the first obtaining module 82 is specifically configured to: if the transmitting end or the receiving end comprises ground equipment, the position and the moving speed of the ground equipment are obtained through a GPS and/or a Beidou navigation system; if the transmitting end or the receiving end comprises the satellite, the position and the moving speed of the satellite are acquired through satellite ephemeris.
Optionally, the first calculating module 84 is specifically configured to: calculating the relative speed of the transmitting end and the receiving end and the position connecting line vector of the transmitting end and the receiving end according to the position and the moving speed of the transmitting end and the position and the moving speed of the receiving end; calculating to obtain the cosine value of the included angle of the relative speed and the position connecting line vector; and calculating to obtain the chip Doppler frequency shift between the transmitting end and the receiving end according to the cosine value and the relative speed of the included angle.
Optionally, the transmitting module 88 is specifically configured to: modifying the current sending rate of the sending end into a target sending rate through a variable rate FIR filter, and sending a target signal to a receiving end at the target sending rate; wherein the variable rate FIR filter comprises one or more of Lagrange interpolation filter, third order spline interpolation filter, fractional order sampling filter.
Optionally, the encoding method of the target signal includes one or a combination of convolutional code, Turbo code, low density parity check L DPC code, polarization code, RS code, and linear block code, and the information included in the target signal includes one or more of text, audio, picture, and video.
In the embodiment of the present invention, the first obtaining module 82 obtains the communication parameters, and the first calculating module 84 calculates, according to the communication parameters, the chip doppler frequency shift between the transmitting end and the receiving end; the first determining module 86 determines the target sending rate of the transmitting end according to the chip doppler frequency shift and a preset standard rate; the transmitting module 88 transmits the target signal to be transmitted to the receiving end according to the target transmission rate, so that the receiving end receives the target signal according to the standard rate. Compared with the prior art that the signal is directly transmitted at the standard rate, the transmitting end and/or the receiving end which move at high speed determine the target transmitting rate on the basis of the chip Doppler frequency shift and the standard rate at the transmitting end under the condition of accurate space positioning and time service, and transmit the target signal according to the target transmitting rate, so that the influence of the Doppler frequency shift is reduced, the change of the information frame length in the signal transmission process is reduced, the frequency estimation precision is improved, and the intersymbol interference is avoided to a certain extent.
In some possible embodiments, the communication parameters further include a communication mode, and the communication mode includes many-to-one communication, one-to-many communication, or peer-to-peer communication; referring to a schematic structural diagram of another wireless communication apparatus shown in fig. 9, on the basis of fig. 8, the apparatus further includes:
a first determining module 92, configured to determine whether the communication mode is one-to-many communication;
the first calculating module 84 is further configured to: when the judgment result of the first judgment module 92 is negative, the chip doppler frequency shift between the transmitting end and the receiving end is calculated according to the communication parameters.
Optionally, as shown in fig. 9, the apparatus further includes:
a second determining module 94, configured to determine a relative speed between the transmitting end and the receiving end according to the moving speed of the transmitting end and the moving speed of the receiving end; judging whether the magnitude of the relative speed is larger than a preset speed threshold value or not;
the first calculating module 84 is further configured to: when the judgment result of the second judgment module 94 is yes, the chip doppler frequency shift between the transmitting end and the receiving end is calculated according to the communication parameters.
The wireless communication device provided by the embodiment of the present invention has the same implementation principle and technical effect as the aforementioned wireless communication method applied to the transmitting end, and for the sake of brief description, no mention is made in the device embodiment, and reference may be made to the corresponding contents in the aforementioned corresponding method embodiments.
The embodiment of the invention also provides another wireless communication device which is applied to a receiving end in a wireless communication system. Referring to fig. 10, another structure of a wireless communication apparatus is shown, the wireless communication apparatus includes:
a second obtaining module 102, configured to obtain a communication parameter when a target signal transmitted by a transmitting end of the wireless communication system according to a standard rate is received; the communication parameters comprise the position and the moving speed of a transmitting end and the position and the moving speed of a receiving end;
a second calculating module 104, configured to calculate, according to the communication parameter, a chip doppler frequency shift between the transmitting end and the receiving end;
a second determining module 106, configured to determine a target receiving rate of the receiving end according to the chip doppler shift and the standard rate;
a receiving module 108, configured to receive the target signal according to the target receiving rate.
In the embodiment of the present invention, when receiving a target signal transmitted by a transmitting terminal of a wireless communication system according to a standard rate, a second obtaining module 102 obtains a communication parameter; the second calculation module 104 calculates to obtain a chip doppler frequency shift between the transmitting end and the receiving end according to the communication parameters; the second determining module 106 determines the target receiving rate of the receiving end according to the chip doppler frequency shift and the standard rate; the receiving module 108 receives the target signal at the target receiving rate. Compared with the prior art that the signal is directly received at the standard speed, the transmitting end and/or the receiving end which move at a high speed, the receiving end and the receiving end determine the target receiving speed based on the chip Doppler frequency shift and the standard speed, and receive the target signal according to the target receiving speed, namely, the receiving end corrects the received signal speed, so that the receiving end can accurately receive and demodulate the signal, the OFDM/OFDMA communication is realized, the influence of the Doppler frequency shift is reduced, the information frame length change in the signal transmission process is reduced, the frequency estimation precision is improved, and the intersymbol interference is avoided to a certain extent.
In some possible embodiments, referring to a schematic structural diagram of another wireless communication apparatus shown in fig. 11, on the basis of fig. 10, the apparatus further includes:
a third determining module 112, configured to determine a relative speed between the transmitting end and the receiving end according to the moving speed of the transmitting end and the moving speed of the receiving end; judging whether the magnitude of the relative speed is larger than a preset speed threshold value or not;
the second calculating module 104 is further configured to: if the determination result of the third determining module 112 is yes, the chip doppler frequency shift between the transmitting end and the receiving end is calculated according to the communication parameters.
The wireless communication device provided in the embodiment of the present invention has the same implementation principle and technical effect as the wireless communication method embodiment applied to the receiving end, and for brief description, no mention is made in the device embodiment, and reference may be made to the corresponding contents in the corresponding method embodiment.
Embodiments of the present invention also provide a communication device (transmitting end or receiving end), which includes a memory for storing a program that enables the processor to execute the wireless communication method provided in the foregoing embodiments, and a processor configured to execute the program stored in the memory. The communication device may also include a communication interface for communicating with other devices or a communication network.
Referring to fig. 12, an embodiment of the present invention further provides a communication device 100, including: the system comprises a processor 10, a memory 11, a bus 12 and a communication interface 13, wherein the processor 10, the communication interface 13 and the memory 11 are connected through the bus 12; the processor 10 is arranged to execute executable modules, such as computer programs, stored in the memory 11.
The memory 11 may include a high-speed Random Access Memory (RAM) and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory. The communication connection between the network element of the system and at least one other network element is realized through at least one communication interface 13 (which may be wired or wireless), and the internet, a wide area network, a local network, a metropolitan area network, and the like can be used.
The bus 12 may be an ISA bus, a PCI bus, an EISA bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one double-headed arrow is shown in FIG. 12, but that does not indicate only one bus or one type of bus.
The memory 11 is configured to store a program, and the processor 10 executes the program after receiving an execution instruction, and the method executed by the apparatus defined by the flow process disclosed in any of the foregoing embodiments of the present invention may be applied to the processor 10, or implemented by the processor 10.
The processor 10 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 10. The Processor 10 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 11, and the processor 10 reads the information in the memory 11 and completes the steps of the method in combination with the hardware thereof.
The embodiment of the invention also provides a wireless communication system, which comprises the transmitting terminal and the receiving terminal of the embodiment; the transmitting end is in communication connection with the receiving end.
In addition, the embodiment of the present invention also provides a computer readable medium having a non-volatile program code executable by a processor, where the program code causes the processor to execute the wireless communication method of the foregoing method embodiment.
Unless specifically stated otherwise, the relative steps, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present invention.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The wireless communication method, apparatus, system, transmitting end and receiving end provided in the embodiments of the present invention include a computer readable storage medium storing a program code, where instructions included in the program code may be used to execute the method described in the foregoing method embodiments, and specific implementation may refer to the method embodiments, and will not be described herein again.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (12)
1. A wireless communication method, applied to a transmitting end in a wireless communication system, the method comprising:
acquiring communication parameters, wherein the communication parameters comprise the position and the moving speed of the transmitting end and the position and the moving speed of the receiving end of the wireless communication system;
calculating to obtain the chip Doppler frequency shift between the transmitting end and the receiving end according to the communication parameters;
determining the target sending rate of the transmitting end according to the chip Doppler frequency shift and a preset standard rate;
transmitting a target signal to be transmitted to the receiving end according to the target transmission rate so that the receiving end receives the target signal according to the standard rate;
wherein,
calculating the chip Doppler frequency shift between the transmitting end and the receiving end according to the communication parameters, wherein the step comprises the following steps: calculating the relative speed between the transmitting end and the receiving end and the position connecting line vector between the transmitting end and the receiving end according to the position and the moving speed of the transmitting end and the position and the moving speed of the receiving end; calculating to obtain a cosine value of an included angle between the relative speed and the position connecting line vector; calculating to obtain chip Doppler frequency shift between the transmitting end and the receiving end according to the cosine value of the included angle and the relative speed;
the step of transmitting the target signal to be transmitted to the receiving end according to the target transmission rate includes:
modifying the current sending rate of the sending end into the target sending rate through a variable rate FIR filter, and sending the target signal to the receiving end at the target sending rate; wherein the variable rate FIR filter comprises a combination of one or more of a Lagrange interpolation filter, a third order spline interpolation filter, a fractional order sampling filter.
2. The method of claim 1, wherein the transmitting end and the receiving end each comprise a terrestrial device or a satellite; the step of obtaining communication parameters comprises:
if the transmitting end or the receiving end comprises ground equipment, the position and the moving speed of the ground equipment are obtained through a GPS and/or a Beidou navigation system;
and if the transmitting end or the receiving end comprises a satellite, acquiring the position and the moving speed of the satellite through satellite ephemeris.
3. The method of claim 1, wherein the communication parameters further comprise a communication mode, wherein the communication mode comprises a many-to-one communication, a one-to-many communication, or a peer-to-peer communication;
before calculating the chip doppler shift between the transmitting end and the receiving end according to the communication parameters, the method further comprises:
judging whether the communication mode is one-to-many communication;
and if not, executing the step of calculating to obtain the code chip Doppler frequency shift between the transmitting end and the receiving end according to the communication parameters.
4. The method of claim 1, wherein before calculating the chip doppler shift between the transmitting end and the receiving end according to the communication parameters, the method further comprises:
determining the relative speed of the transmitting end and the receiving end according to the moving speed of the transmitting end and the moving speed of the receiving end;
judging whether the relative speed is larger than a preset speed threshold value or not;
if yes, the step of calculating the code chip Doppler frequency shift between the transmitting end and the receiving end according to the communication parameters is executed.
5. The method of claim 1, wherein the target signal is encoded by one or more of convolutional code, Turbo code, low density parity check L DPC code, polar code, RS code, and linear block code, and the information contained in the target signal comprises one or more of text, audio, picture, and video.
6. A wireless communication method, applied to a receiving end in a wireless communication system, the method comprising:
when a target signal transmitted by a transmitting terminal of the wireless communication system according to a standard rate is received, acquiring communication parameters; wherein the communication parameters comprise the position and the moving speed of the transmitting terminal and the position and the moving speed of the receiving terminal;
calculating to obtain the chip Doppler frequency shift between the transmitting end and the receiving end according to the communication parameters;
determining a target receiving rate of the receiving end according to the chip Doppler frequency shift and the standard rate;
receiving the target signal at the target reception rate;
wherein,
calculating the chip Doppler frequency shift between the transmitting end and the receiving end according to the communication parameters, wherein the step comprises the following steps: calculating the relative speed between the transmitting end and the receiving end and the position connecting line vector between the transmitting end and the receiving end according to the position and the moving speed of the transmitting end and the position and the moving speed of the receiving end; calculating to obtain a cosine value of an included angle between the relative speed and the position connecting line vector; calculating to obtain chip Doppler frequency shift between the transmitting end and the receiving end according to the cosine value of the included angle and the relative speed;
the step of receiving the target signal at the target receiving rate includes: modifying the current sending rate of the transmitting end into the target sending rate through a variable rate FIR filter, and receiving the target signal according to the target receiving rate; wherein the variable rate FIR filter comprises a combination of one or more of a Lagrange interpolation filter, a third order spline interpolation filter, a fractional order sampling filter.
7. A wireless communication apparatus, for a transmitting end in a wireless communication system, the apparatus comprising:
a first obtaining module, configured to obtain communication parameters, where the communication parameters include a position and a moving speed of the transmitting end, and a position and a moving speed of a receiving end of the wireless communication system;
the first calculation module is used for calculating and obtaining the chip Doppler frequency shift between the transmitting end and the receiving end according to the communication parameters;
a first determining module, configured to determine a target sending rate of the transmitting end according to the chip doppler shift and a preset standard rate;
the transmitting module is used for transmitting a target signal to be transmitted to the receiving end according to the target transmitting rate so that the receiving end receives the target signal according to the standard rate;
the first calculating module is further configured to calculate, according to the position and the moving speed of the transmitting end and the position and the moving speed of the receiving end, a relative speed between the transmitting end and the receiving end and a position connecting line vector between the transmitting end and the receiving end; calculating to obtain a cosine value of an included angle between the relative speed and the position connecting line vector; calculating to obtain chip Doppler frequency shift between the transmitting end and the receiving end according to the cosine value of the included angle and the relative speed;
the transmitting module is further configured to modify the current sending rate of the transmitting end to the target sending rate through a variable rate FIR filter, and transmit the target signal to the receiving end at the target sending rate; wherein the variable rate FIR filter comprises a combination of one or more of a Lagrange interpolation filter, a third order spline interpolation filter, a fractional order sampling filter.
8. A wireless communication apparatus, for a receiving end in a wireless communication system, the apparatus comprising:
the second acquisition module is used for acquiring communication parameters when receiving a target signal transmitted by a transmitting terminal of the wireless communication system according to a standard rate; wherein the communication parameters comprise the position and the moving speed of the transmitting terminal and the position and the moving speed of the receiving terminal;
the second calculation module is used for calculating and obtaining the chip Doppler frequency shift between the transmitting end and the receiving end according to the communication parameters;
a second determining module, configured to determine a target receiving rate of the receiving end according to the chip doppler shift and the standard rate;
a receiving module, configured to receive the target signal according to the target receiving rate;
the second determining module is further configured to calculate, according to the position and the moving speed of the transmitting end and the position and the moving speed of the receiving end, a relative speed between the transmitting end and the receiving end and a position connecting line vector between the transmitting end and the receiving end; calculating to obtain a cosine value of an included angle between the relative speed and the position connecting line vector; calculating to obtain chip Doppler frequency shift between the transmitting end and the receiving end according to the cosine value of the included angle and the relative speed;
the receiving module is further configured to modify the current sending rate of the transmitting end to the target sending rate through a variable rate FIR filter, and receive the target signal according to the target receiving rate; wherein the variable rate FIR filter comprises a combination of one or more of a Lagrange interpolation filter, a third order spline interpolation filter, a fractional order sampling filter.
9. A transmitting end comprising a memory, a processor, a computer program being stored in the memory and being executable on the processor, characterized in that the processor implements the method of any of claims 1-5 when executing the computer program.
10. A receiving end comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method of claim 6 when executing the computer program.
11. A wireless communication system, comprising the transmitting end according to claim 9 and the receiving end according to claim 10, wherein the transmitting end is communicatively connected to the receiving end.
12. A computer-readable medium having non-volatile program code executable by a processor, the program code causing the processor to perform the method of any one of claims 1 to 5 or the method of claim 6.
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