CN105491637A - Method and system for searching for optimum relay position of mobile relay based on fixed step size - Google Patents
Method and system for searching for optimum relay position of mobile relay based on fixed step size Download PDFInfo
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Abstract
The present invention discloses a method and a system for searching for an optimum relay position of a mobile relay based on a fixed step size. The method comprises the following steps: the mobile relay receives a test signal sent by a source terminal and forwards the test signal to a destination terminal after amplification; the destination terminal calculates the communication performance according to the amplified test signal and generates a bit information to be fed back to the mobile relay after comparing with the communication performance of a stored optimum known position; and the mobile relay moves to a next relay position according to the bit information and a preset fixed step size and performs the step of receiving the test signal sent by the source terminal again until the optimum relay position is determined. The method can improve the performance of relay communication, and can still determine an optimum relay position point within a preset trajectory range as long as the destination terminal feeds back the bit information to the mobile relay to search and control, without acquiring the position information of the source terminal and the destination terminal and increasing antennas, thereby expanding an application range.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a method and a system for searching an optimal relay position of a mobile relay based on a fixed step length.
Background
The communication relay can be used for forwarding information sent out among different nodes, so that the communication range is expanded, and the performance of a communication system is improved. Terrestrial radio communications are easily obstructed and shielded by obstacles, and aircraft, satellites and unmanned aerial vehicles (UVAs) can act as communication relays because airborne relays can effectively establish connections for two parties that need to communicate with each other in rugged mountainous or urban areas.
Among the prior art, the mode of being applied to unmanned aerial vehicle and confirming relay position mainly has: the position information of the ground communication unit is measured using a Global Positioning System (GPS), the unmanned aerial vehicle searches for the best relay position using the GPS, and a disturbance-based extremum search control algorithm, an overloaded antenna-based algorithm, and the like.
However, in the above prior art, certain disadvantages and shortcomings exist, which are mainly reflected in:
1. the ground communication unit needs to measure own position information by using a GPS function of the ground communication unit and send the information to the unmanned aerial vehicle, and the position search is failed due to the fact that the GPS function is easily attacked and interfered;
2. for a ground communication unit without a GPS function or with damaged GPS equipment, some existing technologies cannot be used, namely the existing technology for determining the relay position is limited in use;
3. the optimal relay position is determined by estimating the airborne multi-antenna signal arrival angle (DOA), so that estimation errors are prone to occur relative to a single antenna, and meanwhile, the complexity of the unmanned aerial vehicle communication equipment and the algorithm complexity are increased.
Disclosure of Invention
The embodiment of the invention provides a method and a system for searching an optimal relay position of a mobile relay based on a fixed step length, wherein the optimal relay position of the mobile relay is determined by comparing communication performances at different positions, so that the efficiency and the accuracy of determining the optimal relay position of the mobile relay are improved, and the application range is increased.
The embodiment of the invention discloses a method for searching the optimal relay position of a mobile relay based on a fixed step length, which comprises the following steps:
step A, a mobile relay receives a test signal sent by a source end at any position of a fixed track, amplifies the test signal and forwards the test signal to a destination end;
step B, the destination receives the signal sent by the mobile relay and calculates the communication performance of the time, wherein the communication performance comprises signal-to-noise ratio and bit error rate, and compares the calculation result with the communication performance of the stored best known relay position, and generates bit information to feed back the bit information to the mobile relay, wherein the bit information represents the comparison result of the current communication performance and the communication performance of the stored best known relay position, and the best known relay position is the position with the best tested communication performance;
step C, the mobile relay records the current position information, moves to the next relay position according to the one-bit information and the preset fixed step length, and returns to the step A until the optimal relay position is finally determined, wherein the optimal relay position is as follows: the position with the best communication performance in a preset searching time length, or the position with the best communication performance when the mobile relay moves the whole fixed track, or the position with the best communication performance meeting the system setting requirement.
The embodiment of the invention discloses a mobile relay optimal relay position searching system based on fixed step length, which comprises:
a mobile relay, a source terminal and a destination terminal;
the mobile relay is arranged at any position of a fixed track, receives a test signal sent by the source end, amplifies and forwards the test signal to the destination end;
the destination end receives a signal sent by the mobile relay and calculates the communication performance of the time, wherein the communication performance comprises a signal-to-noise ratio and an error rate, and compares the calculation result with the communication performance of the stored best known relay position to generate one bit of information to be fed back to the mobile relay, the one bit of information represents the comparison result of the current communication performance and the communication performance of the stored best known relay position, and the best known relay position is the position with the best tested communication performance;
the mobile relay records the current position information, moves to the next relay position according to the bit information and the preset fixed step length, returns to the execution step, receives the test signal sent by the source end on any position of the fixed track, amplifies and forwards the test signal to the destination end until the optimal relay position is finally determined, wherein the optimal relay position is as follows: the position with the best communication performance in a preset searching time length, or the position with the best communication performance when the mobile relay moves the whole fixed track, or the position with the best communication performance meeting the system setting requirement.
According to the technical scheme, the embodiment of the invention has the following advantages: the optimal relay position of the mobile relay is searched by utilizing the fixed disturbance step length and the communication performance strength, the performance of relay communication can be improved, the dependence on the position information of a source end and a target end is not needed, multiple antennas are not needed, only one bit of information is fed back to the mobile relay by the target end to control the mobile relay to search the optimal relay position, the application range is wider, the applicability is stronger, the limitation is small, and the efficiency and the accuracy for determining the optimal relay position are improved.
Drawings
Fig. 1 is a flowchart illustrating a method for searching an optimal relay position of a mobile relay based on a fixed step length according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a mobile relay communication model according to an embodiment of the present invention;
FIGS. 3a and 3b are simulation diagrams of a mobile relay searching for an optimal relay position based on SNR in an embodiment of the present invention;
fig. 4a and 4b are simulation diagrams of a mobile relay searching for an optimal relay position based on an error rate according to an embodiment of the present invention;
fig. 5 is a diagram illustrating a mobile relay optimal relay location search system based on a fixed step size according to a second embodiment of the invention.
Detailed Description
The embodiment of the invention provides a method and a system for searching an optimal relay position of a mobile relay based on a fixed step length.
The embodiment of the invention is suitable for the fixed relay motion track, and the application scenes can be the scenes of the construction of a temporary communication system, the communication connection of a disaster site and the like.
Referring to fig. 1, a method for searching an optimal relay position of a mobile relay based on a fixed step length according to a first embodiment of the present invention includes the following steps:
and step A, the mobile relay receives the test signal sent by the source end at any position of the fixed track, amplifies the test signal and forwards the test signal to the destination end.
The test signal is a signal for testing communication performance, which can help the mobile relay to search for the best relay position, data for testing communication performance can be carried in the test signal, and before the mobile relay searches for the best relay position, the source end sends all the test signals, and only after the mobile relay finds the best relay position, the source end sends really useful data.
In the nth time slot, the source end sends a test signal to the mobile relay, and the mobile relay receives the test signal sent by the source end at any position of the fixed track, amplifies the test signal and forwards the amplified test signal to the destination end, so that the destination end compares the communication performance strength of the test signal with the stored communication performance strength of the best known position.
And step B, the destination terminal receives the signal sent by the mobile relay and calculates the communication performance of the time, wherein the communication performance comprises the signal-to-noise ratio and the error rate, and compares the calculation result with the communication performance of the stored best known relay position to generate one bit of information to be fed back to the mobile relay, and the one bit of information represents the comparison result of the current communication performance and the communication performance of the stored best known relay position.
The best known relay location is the location where the tested communication performance is best.
Before searching the optimal relay position, the mobile relay firstly initializes the position information of the mobile relay, receives the test signal emitted from the source end, amplifies the test signal and forwards the test signal to the destination end, and the destination end calculates the communication performance and stores the calculation result as the initial record of the destination end. In each time slot, the source end sends a test signal to the mobile relay, the mobile relay amplifies the test signal and sends the amplified test signal to the destination end, and the destination end receives the signal sent by the mobile relay and calculates the communication performance, where the communication performance includes a signal-to-noise ratio (SNR) and a bit error rate (SER), where a larger SNR indicates a stronger communication performance, and a smaller SER indicates a stronger communication performance, and the signal is obtained after the test signal is amplified.
The position with the highest communication performance intensity in all the test signals before the nth time slot is the best known position, and the information of the best known position is stored in the destination terminal and also stored in the mobile relay.
After calculating the communication performance of the current mobile relay and the mobile relay according to the signal, the destination compares the communication performance of the current mobile relay and the communication performance of the best known relay position according to the calculation result, namely, compares the communication performance of the current mobile relay and the current mobile relay position with the communication performance of the best known relay position, so as to judge whether the communication performance of the current mobile relay is improved compared with the communication performance of the last mobile relay position. And the destination terminal updates the best known received signal communication performance in the memory according to the comparison result of the current communication performance and the stored communication performance of the best known relay position.
Further, a bit of information is generated according to the comparison result, and the bit of information is fed back to the mobile relay, where the bit of information indicates the comparison result between the current communication performance and the communication performance of the saved best known relay location, that is, the bit of information includes information on whether the performance of the received signal of the destination is improved. For example, it may be preset that bit information 1 indicates that the current communication performance is improved from the communication performance of the best known position, and bit information 0 indicates that the current communication performance of the signal is reduced from the communication performance of the best known position. In practical applications, the comparison result may also be set in other forms, which are not limited herein.
Specifically, the one-bit information may be a comparison result between the snr of the test signal received by the destination and the snr of the best known position stored on the destination, where the best known position is a position corresponding to the maximum snr of all the test signals calculated before the nth time slot. The one-bit information may also be a comparison result of the bit error rate of the test signal received for the destination and the bit error rate of the best known position stored on the destination, where the best known position is a position corresponding to the minimum bit error rate of all test signals calculated before the nth time slot.
The source end and the destination end may be various types of wireless communication transceiving equipment, such as: cell phones, base stations, etc. The mobile relay uses a single antenna on board.
For convenience of understanding, a scenario of the mobile relay communication will be briefly described, please refer to fig. 2, and fig. 2 is a schematic diagram of a mobile relay communication model in an embodiment of the present invention.
The mobile relay is respectively connected with the source end and the destination end through a wireless network. The mobile relay is a point R on a cylindrical coordinate systemi，RiProjected as a point R on the XOY planei' the source end is a point S on the XOY plane of the cylindrical coordinate system, and the destination end is a point D on the XOY plane of the cylindrical coordinate system.
Specifically, the coordinate variable of the origin O of the cylindrical coordinate system is (0, 0, z), and the coordinate variable of the source end S is (x)s，ys，zs) The coordinate variable of the destination D is (x)d，yd，zd) Moving relay RiIs (r, theta, z), where r is the radius of motion of the mobile relay on the XOY plane and theta is the rotation from the X axis to OR in the counterclockwise direction as viewed from the positive z axisi' Angle turned, z is the height of the moving relay. The origin, r, and z of the cylindrical coordinate system are preset, so that the motion trajectory of the mobile relay is determined, that is, the mobile relay moves on a circle with a radius r of z in fig. 2. The mobile relay has coordinates R (R, θ (n), z) at the nth slot and coordinates R (R, θ (n +1), z) at the n +1 th slot.
The transformation relationship between the cylindrical coordinate system (r, theta, z) and the spatial rectangular coordinate system (x, y, z) is as follows:
further, in the nth slot, the communication distance (i.e., the straight-line distance) d between the mobile relay and the source end S1And a communication distance D between the destination terminal D and the terminal2Respectively as follows:
in the following, taking the communication performance as the signal-to-noise ratio as an example, the communication process and the signal-to-noise ratio of the mobile relay, the source end and the destination end are described, please refer to fig. 2:
first hop communication: source to mobile relay;
signal sent by source to mobile relay:
E[|n1|2]＝N01(2)
where x denotes the test signal emitted by the source, PSDenotes the emission power of the source terminal, LS,RRepresenting the free space path loss, n, from source to mobile relay1Which represents the additive white gaussian noise of the first hop communication. E denotes solving the mathematical expectation, N01Representing additive white Gaussian noise n1Of the power of (c).
Free space path loss of first hop communication:
where λ represents the wavelength of the test signal emitted by the source, d1Representing the distance between the source and the mobile relay.
The signal has fading in the transmission process and is also interfered by noise, and the information forwarded by the mobile relay includes a test signal subjected to free path fading and white gaussian noise.
And second hop communication: moving the relay to the destination;
the signal sent to the destination terminal by the mobile relay is as follows:
E[|n2|2]＝N02(5)
wherein x represents a test signal, PSDenotes the emission power of the source terminal, LS,RRepresents the free path loss, L, from source to mobile relayR,DRepresenting the free path loss from the source to the mobile relay, G representing the gain of the mobile relay to the received test signal, i.e. the relay gain, n2Which represents the additive white gaussian noise of the second hop communication. E denotes solving the mathematical expectation, N02Representing additive white Gaussian noise n2Of the power of (c).
Free space path loss of the second hop channel:
where λ represents the wavelength of the amplified test signal emitted by the moving relay, d2Indicating the distance between the destination and the mobile relay.
The gain of the mobile repeater to the received test signal is:
the SNR of the test signal sent by the source end after being received by the destination end is obtained from formula (4) as follows:
wherein the SNR1、SNR2The following were used:
the meaning of the parameters in the formulas (7), (8) and (9) is referred to the foregoing description and will not be described herein.
And step C, recording the current position information by the mobile relay, moving to the next relay position according to the one-bit information and the preset fixed step length, and returning to the step A until the optimal relay position is finally determined.
Specifically, if the one-bit information indicates that the current communication performance is greater than the communication performance of the best known relay position, the current position is recorded as the best known position, and the current position is randomly moved by a fixed step length to determine and move to the next relay position, wherein the random increase means that a positive symbol and a negative symbol are randomly selected to increase.
If the one-bit information indicates that the current communication performance is less than the communication performance of the best known relay position, the mobile relay returns to the last position, then randomly increases a fixed step length to determine and move to the next relay position, and returns to the step A until the best relay position is finally determined.
Randomly adding a perturbation step with a fixed value to each iteration time slot:
(n)＝±0
wherein,0for a fixed step size, n represents the number of slots, and for each additional slot, (n) is appliedIs increased by one0. When (n) ═0When, it means that the mobile relay moves one counter-clockwise0When (n) ═ -0When, it means the mobile relay moves clockwise one0。
It should be noted that the moving direction of the mobile relay may be reversed, that is, when (n) is equal to n0When, it means the mobile relay moves clockwise one0When (n) ═ -0When, it means that the mobile relay moves one counter-clockwise0。
The mobile relay records its current position, and takes the current position as the best known relay position, where θ (n) represents the number of slots. The mobile relay calculates the next position according to the fixed step length and moves to the next position toRepresenting the next position, and the random increment step is represented by (n), then:
further, the mobile relay determines the next relay position according to the information of whether the destination received signal performance in the one-bit information is improved and a preset fixed step size. When the mobile relay determines that the signal performance of the mobile relay received by the destination is improved, that is, when the current communication performance is higher than the communication performance of the stored best known relay position, the mobile relay records the current position as the best known position θ (n +1) ═ θ (n) + (n), and when the signal performance of the mobile relay received by the destination is not improved, that is, when the current communication performance is worse than the communication performance of the stored best known relay position, the mobile relay returns to the position θ (n +1) ═ θ (n) of the previous time slot, and the process returns to step a.
The optimal relay position includes: the position with the best communication performance in the preset searching time length, or the position with the best communication performance when the mobile relay moves the whole fixed track, or the position with the best communication performance meeting the set requirement of the system. That is, the optimal relay position is determined by setting any one of the search time, the search distance, and the communication performance strength of the mobile relay.
If the next relay location is not the best relay location, step a is executed again: and the mobile relay receives the test signal sent by the source end at any position of the fixed track, amplifies the test signal and forwards the amplified test signal to the destination end, and thus, the steps A to C are performed in a circulating manner until the optimal relay position is searched. That is, the relay position with the highest communication performance strength of the signal is searched, and after the optimal relay position is determined, the loop search process is stopped.
Specifically, when the communication performance is the signal-to-noise ratio, if the comparison result is that the signal-to-noise ratio of the current communication is greater than the signal-to-noise ratio of the best known position, it indicates that the communication condition of the current position is better, and the current position is more suitable for being used as the relay position.
And, the mobile relay updates the signal-to-noise ratio of the best received signal, and the updating rule is as follows:
SNRbest(n+1)＝max(SNRbest(n),SNR(n))
wherein the SNRbestSignal-to-noise ratio, max (SNR), of the signal received optimally for the (n +1) th slotbest(n), SNR (n) represents the maximum value of the SNR at the best known position of the nth time slot and the SNR at the current position, and the maximum value is the SNRbest。
Meanwhile, the mobile relay updates the current position to the best known position, and the updating rule is as follows:
the comparison result is that the signal-to-noise ratio of the current communication is smaller than that of the best known position, which indicates that the communication condition of the current position is not ideal, and no best known position is more suitable for being used as the relay position, so the mobile relay returns to the position where the mobile relay is located last time, and randomly moves a distance of the fixed step length to determine and move to the next relay position.
When the communication performance is the error rate, if the error rate of the test signal is lower than the error rate of the best known position as the comparison result, the communication condition of the current position is better, and the test signal is preferably used as a relay position.
If the error rate of the test signal is greater than that of the best known position, it indicates that the communication condition of the current position is not ideal, and no best known position is better for the relay position, so the mobile relay will return to the previous position and randomly move a distance of the fixed step length to determine and move to the next relay position.
Further, if the comparison result is that the calculated signal-to-noise ratio of the test signal is greater than the signal-to-noise ratio of the best known position, or if the comparison result is that the calculated error rate of the test signal is less than the signal-to-noise ratio of the best known position, the current position of the mobile relay is updated to the best known position, and the signal-to-noise ratio or the error rate of the test signal is correspondingly updated.
In the embodiment of the invention, the optimal relay position of the mobile relay is searched by utilizing the fixed disturbance step length and the communication performance strength, so that the performance of relay communication can be improved, the dependence on the position information of a source end and a target end is not required, multiple antennae are not required, only one bit of information is fed back to the target end to control the mobile relay to search the optimal relay position, the application range is wider, the applicability is stronger, the limitation is small, and the efficiency and the accuracy for determining the optimal relay position are improved.
In the above embodiment of the method for searching for an optimal relay position of a mobile relay based on a fixed step length, simulation diagrams of searching for an optimal relay position of a mobile relay by using an snr are shown in fig. 3a and 3b, and simulation diagrams of searching for an optimal relay position of a mobile relay by using an ber are shown in fig. 4a and 4 b:
wherein, the initial step length:
position coordinates of the source end: (x)s,ys,zs)＝(0,-700,1)
Position coordinates of the destination: (x)d,yd,zd)＝(30,-600,1)
Position coordinates of mobile relay: (r, θ (n), z) ═ 500, θ (n),30)
Fig. 3a and 3b show the communication performance strength, i.e., formula (8), based on the signal-to-noise ratio, where the horizontal axis of fig. 3a shows θ (n) and the vertical axis shows the signal-to-noise ratio SNR from the source end to the destination end of the relay position corresponding to θ (n). Figure 3b shows the number of slots spent by the mobile relay in searching for the best relay position on the horizontal axis and the signal-to-noise ratio from source to destination on the vertical axis. When the 35 th time slot is searched, the best relay position, i.e. the position corresponding to the maximum point in fig. 3a, is determined.
Fig. 4a and 4b show communication performance strength based on the bit error rate, the horizontal axis of fig. 4a shows θ (n), and the vertical axis shows the BER from the source end to the destination end of the relay position corresponding to θ (n). Fig. 4b shows the number of slots spent in the mobile relay searching for the best relay position on the horizontal axis and the error rate from source to destination on the vertical axis. When the 35 th time slot is searched, the best relay position, i.e. the position corresponding to the minimum point in fig. 4a, is determined.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a mobile relay optimal relay position searching system based on a fixed step size according to a second embodiment of the present invention, and for convenience of illustration, only the parts related to the embodiment of the present invention are shown. The system mainly comprises: a mobile relay 501, a source peer 502, and a destination peer 503.
The mobile relay 501 receives a test signal sent from the source terminal 502 at an arbitrary position of the fixed track, and amplifies and forwards the test signal to the destination terminal 503.
The destination 503 receives the signal sent from the mobile relay 501 and calculates the communication performance of this time, which includes the signal-to-noise ratio and the error rate, and compares the calculation result with the communication performance of the stored best known relay position, and generates a bit of information to be fed back to the mobile relay 501, where the bit of information represents the comparison result between the current communication performance and the communication performance of the stored best known relay position, and the best known relay position is the position with the best communication performance tested.
The mobile relay 501 records the current position information and moves to the next relay position according to the bit information and the preset fixed step length, and returns to the execution step that the mobile relay is at any position of the fixed track, receives the test signal sent from the source end, amplifies the test signal and forwards the test signal to the destination end, and continuously circulates until the optimal relay position is finally determined. The optimal relay positions are: the position with the best communication performance within the preset search time, or the position with the best communication performance when the mobile relay 501 moves the whole fixed track, or the position with the best communication performance meets the system setting requirement.
Further, the mobile relay 501 initializes its location information before performing the best relay location search, and receives the test signal transmitted from the source terminal 502 and amplifies the test signal to be forwarded to the destination terminal 503.
Further, if the one-bit information indicates that the current communication performance is greater than the communication performance of the best known relay location, the current location of the mobile relay 501 is recorded as the best known location, and is randomly moved by one of the fixed step sizes to determine and move to the next relay location. If the one-bit information indicates that the current communication performance is less than the communication performance of the best known relay location, the mobile relay 501 returns to the previous location and then randomly moves a fixed step to determine and move to the next relay location.
For a specific process of implementing each function by the mobile relay, the source end, and the destination end of the mobile relay optimal relay position searching system based on the fixed step length in this embodiment, please refer to the specific contents described in the embodiment shown in fig. 1, which is not described herein again.
In the embodiment of the invention, the optimal relay position of the mobile relay is searched by utilizing the fixed disturbance step length and the communication performance strength, so that the performance of relay communication can be improved, the dependence on the position information of a source end and a target end is not required, multiple antennae are not required, only one bit of information is fed back to the target end to control the mobile relay to search the optimal relay position, the application range is wider, the applicability is stronger, the limitation is small, and the efficiency and the accuracy for determining the optimal relay position are improved.
Those skilled in the art will appreciate that all or part of the steps in the method according to the above embodiments may be implemented by hardware instructions related to a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk, an optical disk, or the like.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above detailed description is directed to a method and system for searching an optimal relay position of a mobile relay based on a fixed step length, and those skilled in the art will appreciate that the present invention is not limited to the above description.
Claims (10)
1. A method for searching an optimal relay position of a mobile relay based on a fixed step length is characterized by comprising the following steps:
step A, a mobile relay receives a test signal sent by a source end at any position of a fixed track, amplifies the test signal and forwards the test signal to a destination end;
step B, the destination receives the signal sent by the mobile relay and calculates the communication performance of the time, wherein the communication performance comprises signal-to-noise ratio and bit error rate, and compares the calculation result with the communication performance of the stored best known relay position, and generates bit information to feed back the bit information to the mobile relay, wherein the bit information represents the comparison result of the current communication performance and the communication performance of the stored best known relay position, and the best known relay position is the position with the best tested communication performance;
step C, the mobile relay records the current position information, moves to the next relay position according to the one-bit information and the preset fixed step length, and returns to the step A until the optimal relay position is finally determined, wherein the optimal relay position is as follows: the position with the best communication performance in a preset searching time length, or the position with the best communication performance when the mobile relay moves the whole fixed track, or the position with the best communication performance meeting the system setting requirement.
2. The search method of claim 1, further comprising:
with yRRepresenting the test signal received by the mobile relay, then:
where x denotes the test signal emitted by the source, PSDenotes the source side emission power, LS,RRepresenting a free space path loss, n, of a first hop communication of the source to the mobile relay1Additive white gaussian noise representing the first hop communication;
before searching for the optimal relay position, the mobile relay initializes the position information thereof, receives the test signal emitted by the source end, amplifies the test signal and forwards the test signal to the destination end;
and the destination terminal calculates the communication performance and saves the calculation result as an initial record.
3. The search method of claim 1, further comprising:
with yDIndicating receipt of destinationAnd (3) signal, then:
yD＝yRGLR,D+n2wherein y isRRepresenting signals received by the mobile relay, G representing relay gain, LR,DRepresenting a free space path loss, n, of a second hop communication of the mobile relay to the destination2An additive white gaussian noise representative of the second hop communication.
4. The searching method of claim 1, wherein in the step C, the moving relay records the current position information and determines to move to the next relay position according to the one bit information and a preset fixed step size, and the method comprises:
if the bit information indicates that the current communication performance is greater than the communication performance of the best known relay position, recording the current position as the best known position, and randomly increasing one fixed step length to determine and move to the next relay position, wherein the random increase refers to randomly selecting a positive symbol and a negative symbol to increase;
if the one-bit information indicates that the current communication performance is less than the communication performance of the best known relay position, the mobile relay returns to the last position, and then randomly increases one fixed step length to determine and move to the next relay position.
5. The searching method of claim 1, wherein in the step C, the moving relay records the current position information and moves to the next relay position according to the one-bit information and a preset fixed step size, comprising:
step C1, the Mobile Relay records its Current positionn represents the number of time slots;
step C2, the mobile relay calculating the next position according to the fixed step size and moving to the next position toRepresents the next position by (n) ═ plus or minus0Which means that the step size is increased randomly,0representing said fixed step size, then:θ (n) represents the best known relay position.
6. The searching method of claim 5, wherein the step B further comprises:
and the destination terminal updates the communication performance of the best known received signal in the memory according to the comparison result of the current communication performance and the communication performance of the saved best known relay position.
7. The search method of claim 6, further comprising:
the mobile relay judges the one-bit information;
when the received signal performance is judged to be improved, the current position is recorded as the best known position theta (n +1) ═ theta (n) + (n), and when the received signal performance is judged not to be improved, the position of the previous time slot is returned, and theta (n +1) ═ theta (n) is returned, and the step A is returned.
8. A mobile relay optimal relay position searching system based on fixed step length is characterized in that the searching system comprises a mobile relay, a source end and a destination end;
the mobile relay is arranged at any position of a fixed track, receives a test signal sent by the source end, amplifies and forwards the test signal to the destination end;
the destination end receives a signal sent by the mobile relay and calculates the communication performance of the time, wherein the communication performance comprises a signal-to-noise ratio and an error rate, and compares the calculation result with the communication performance of the stored best known relay position to generate one bit of information to be fed back to the mobile relay, the one bit of information represents the comparison result of the current communication performance and the communication performance of the stored best known relay position, and the best known relay position is the position with the best tested communication performance;
the mobile relay records the current position information, moves to the next relay position according to the bit information and the preset fixed step length, returns to the execution step, receives the test signal sent by the source end on any position of the fixed track, amplifies and forwards the test signal to the destination end until the optimal relay position is finally determined, wherein the optimal relay position is as follows: the position with the best communication performance in a preset searching time length, or the position with the best communication performance when the mobile relay moves the whole fixed track, or the position with the best communication performance meeting the system setting requirement.
9. The searching system of claim 8,
before searching for the best relay position, the mobile relay initializes the position information thereof, receives the test signal emitted by the source end, amplifies the test signal and forwards the test signal to the destination end.
10. The searching system according to claim 8 or 9,
if the one bit of information indicates that the current communication performance is greater than the communication performance of the best known relay position, the mobile relay records the current position as the best known position and randomly moves one fixed step length to determine and move to the next relay position;
if the one-bit information indicates that the current communication performance is less than the communication performance of the best known relay position, the mobile relay returns to the last position, and then randomly moves by one fixed step length to determine and move to the next relay position.
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