CN110445524B - Distributed beam forming method and device - Google Patents
Distributed beam forming method and device Download PDFInfo
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- CN110445524B CN110445524B CN201910601420.8A CN201910601420A CN110445524B CN 110445524 B CN110445524 B CN 110445524B CN 201910601420 A CN201910601420 A CN 201910601420A CN 110445524 B CN110445524 B CN 110445524B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
- H04B7/0857—Joint weighting using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/086—Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
Abstract
The invention relates to the technical field of communication, in particular to a distributed beam forming method and a distributed beam forming device, wherein a current RSS value and a corresponding relation between the current RSS value and each transmitting signal are determined; comparing the current RSS value with the previous RSS value, and when the current RSS value is larger than the previous RSS value, the receiving device takes the current RSS value as the previous RSS value and feeds back updated information of the RSS value to the transmitting device; otherwise, the receiving device maintains the former RSS value unchanged and feeds back the information that the former RSS value is maintained unchanged to the transmitting device; and finally, determining the disturbance values of all transmitting devices when the current RSS value is the maximum, and performing phase coupling on the transmitting signals of all transmitting devices by the receiving device after all transmitting devices feed back the information of which the disturbance values are determined.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a distributed beam forming method and a distributed beam forming device.
Background
Distributed-Beam-forming (Distributed-Beam-forming) is a cooperative communication technique, which is suitable for long-distance transmission, and is used for transmitting the same information from a plurality of transmitting devices to a receiving device, and effectively combining signals of the plurality of transmitting devices in the receiving device by controlling the transmitting phases of the transmitting devices.
When a single transmitting device cannot establish two-way communication with a receiving device, multiple transmitting devices simultaneously transmit the same information, which is an optional strategy. Due to the slight distance difference between the receiving device and each transmitting device, the signals received by the receiving device are superposed with different phases. Therefore, it is necessary to adjust the transmission phase of each transmitting device, so that the signals transmitted by all transmitting devices are phase-coupled at the receiving device, and thus cooperative gain is obtained, which is an important research content of distributed beam forming.
In recent years, a phase synchronization algorithm using single-bit feedback information has been proposed and widely studied. The method can realize the phase synchronization from the transmitting terminal equipment to the receiving terminal equipment through single-bit information under the limited capacity of a feedback channel, and a single-bit feedback frame is a simple and efficient frame in distributed beam forming. The transmitting device determines whether to reserve the channel offset phase according to the received single-bit feedback information.
However, since the transmitting devices cannot communicate their respective transmission phases, and single-bit feedback information is generated according to the variation of the Received Signal, it is a great challenge for the receiving device to obtain an RSS value (Received-Signal-Strength) with good cooperative gain.
Disclosure of Invention
The invention aims to provide a distributed beam forming method and a distributed beam forming device, and aims to provide a rapid and high-precision RSS value acquisition way.
In order to achieve the purpose, the invention provides the following technical scheme:
a method of distributed beamforming, comprising:
determining a current RSS value and a corresponding relation between the current RSS value and each transmitting signal;
comparing the current RSS value with the previous RSS value, and when the current RSS value is larger than the previous RSS value, the receiving device takes the current RSS value as the previous RSS value and feeds back updated information of the RSS value to the transmitting device; otherwise, the receiving device maintains the former RSS value unchanged and feeds back the information that the former RSS value is maintained unchanged to the transmitting device;
and determining the disturbance values of all transmitting devices when the current RSS value is the maximum, and performing phase coupling on the transmitting signals of all transmitting devices by the receiving device after all transmitting devices feed back the information of which the disturbance values are determined.
Further, the correspondence between the current RSS value and each transmitted signal is specifically determined in the following manner:
let the transmission signal of the transmitter numbered i be xi＝cos(wt+θi) Wherein, thetaiIs the initial phase of the transmitting device numbered i, w is the angular frequency of the transmitted signal, t is the time of the transmitted signal, then the expression of the current RSS value is:
Further, the initial value of the early RSS value is a preset default value, and the value range of the preset default value is (0,200).
Further, the step of performing phase coupling on the transmission signals of all the transmitting devices by the receiving device specifically includes:
determining all disturbance values delta in each of said transmitting meansjAnd all disturbance values deltajThe weight Q corresponding to the disturbance interval tablej；
Weight Q for each of the transmitting devicesjNormalization, setting the disturbance value delta in the normalized emitting devicejCorresponding weight is WjBy the formula
Calculate to obtain Wj；
Determining a final disturbance value delta of the transmitting deviceiThe final disturbance value δiBy the formula deltai＝Wj·δjCalculating to obtain;
the received signal of the receiving device after completing the phase coupling is
Further, the step of determining the disturbance values of all transmitting devices when the current RSS value is maximum includes:
determining a disturbance interval table, wherein the disturbance interval table comprises disturbance values, and each disturbance value corresponds to a weight;
randomly selecting one transmitting device from all transmitting devices, and determining a disturbance value according to a comparison result of a random number of the randomly selected transmitting device and the greedy probability;
determining a disturbance value according to feedback information of a comparison result of a current RSS value and a previous RSS value of a receiving device, specifically: when the information fed back by the receiving device is that the current RSS value is larger than the early RSS value, the transmitting device keeps the disturbance values increased on the respective initial phases, gradually increases the weight of the disturbance values in the disturbance interval table, and adjusts the greedy probability to be 1, otherwise, the transmitting device discards the disturbance values increased on the respective initial phases, gradually decreases the weight of the disturbance values in the disturbance interval table, and adjusts the greedy probability;
and after all the transmitting devices determine the disturbance values, all the transmitting devices feed back the information of which the disturbance values are determined.
A distributed beamforming apparatus, comprising:
the device comprises a determining unit, a receiving unit and a processing unit, wherein the determining unit is used for determining a current RSS value and a corresponding relation between the current RSS value and each transmitting signal;
the updating unit is used for comparing the current RSS value with the previous RSS value, when the current RSS value is larger than the previous RSS value, the receiving device takes the current RSS value as the previous RSS value and feeds back information that the RSS value is updated to the transmitting device; otherwise, the receiving device maintains the former RSS value unchanged and feeds back information that the former RSS value is unchanged to the transmitting device;
and the phase coupling unit is used for determining the disturbance values of all the transmitting devices when the current RSS value is maximum, and after all the transmitting devices feed back the information of which the disturbance values are determined, the receiving device performs phase coupling on the transmitting signals of all the transmitting devices.
Further, the correspondence between the current RSS value and each transmitted signal is specifically determined in the following manner:
let the transmission signal of the transmitter numbered i be xi＝cos(wt+θi) Wherein, thetaiIs the initial phase of the transmitting device numbered i, w is the angular frequency of the transmitted signal, t is the time of the transmitted signal, then the expression of the current RSS value is:
Further, the initial value of the early RSS value is a preset default value, and the value range of the preset default value is (0,200).
Further, the phase coupling unit 300 is specifically configured to:
determining all disturbance values delta in each of said transmitting meansjAnd all disturbance values deltajThe weight Q corresponding to the disturbance interval tablej；
Weight Q for each of the transmitting devicesjNormalization, setting the disturbance value delta in the normalized transmitting devicejCorresponding weight is WjBy the formula
Calculate to obtain Wj；
Determining a final disturbance value delta of the transmitting deviceiThe final disturbance value δiBy the formula deltai＝Wj·δjCalculating to obtain;
the received signal of the receiving device after completing the phase coupling is
Further, the phase coupling unit is further configured to:
determining a disturbance interval table, wherein the disturbance interval table comprises disturbance values, and each disturbance value corresponds to a weight;
randomly selecting one transmitting device from all transmitting devices, and determining a disturbance value according to a comparison result of a random number of the randomly selected transmitting device and the greedy probability;
determining a disturbance value according to feedback information of a comparison result of a current RSS value and a previous RSS value of a receiving device, specifically: when the information fed back by the receiving device is that the current RSS value is larger than the early RSS value, the transmitting device keeps the disturbance values increased on the respective initial phases, gradually increases the weight of the disturbance values in the disturbance interval table, and adjusts the greedy probability to be 1, otherwise, the transmitting device discards the disturbance values increased on the respective initial phases, gradually decreases the weight of the disturbance values in the disturbance interval table, and adjusts the greedy probability;
and after all the transmitting devices determine the disturbance values, all the transmitting devices feed back the information of which the disturbance values are determined.
The invention has the beneficial effects that: the invention discloses a distributed beam forming method and a device, firstly determining a current RSS value and a corresponding relation between the current RSS value and each transmitting signal; comparing the current RSS value with the previous RSS value, and when the current RSS value is larger than the previous RSS value, the receiving device takes the current RSS value as the previous RSS value and feeds back updated information of the RSS value to the transmitting device; otherwise, the receiving device maintains the former RSS value unchanged and feeds back the information that the former RSS value is maintained unchanged to the transmitting device; and finally, determining the disturbance values of all transmitting devices when the current RSS value is the maximum, and performing phase coupling on the transmitting signals of all transmitting devices by the receiving device after all transmitting devices feed back the information of which the disturbance values are determined.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a distributed beamforming method according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating step S500 according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a distributed beam forming apparatus 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 accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments of the present invention, other embodiments obtained by a person of ordinary skill in the art without any creative effort belong to the protection scope of the present invention.
Referring to fig. 1, a distributed beamforming method according to an embodiment of the present invention includes the following steps:
step S100, determining a current RSS value and a corresponding relation between the current RSS value and each transmitting signal;
step S200, judging whether the current RSS value is larger than the previous RSS value, if so, executing step S300; if not, executing step S400;
step S300, the receiving device takes the current RSS value as an early-stage RSS value and feeds back updated information of the RSS value to the transmitting device;
step S400, the receiving device maintains the former RSS value unchanged and feeds back information that the former RSS value is unchanged to the transmitting device;
step S500, judging whether all the transmitting devices feed back the information with the determined disturbance value when the current RSS value is maximum, and if not, jumping to the step S100; if yes, go to step S600.
Step S600, the receiving device performs phase coupling on the transmission signals of all the transmitting devices.
It should be noted that, in a distributed beamforming system, by applying the distributed beamforming method provided in this embodiment, usually a specific transmitting apparatus is required to perform cooperative transmission of distributed beamforming, and a receiving apparatus may use a transmitting apparatus meeting set conditions as the specific transmitting apparatus, but since the set conditions may be dynamically adjusted, the transmitting apparatus may filter the specific transmitting apparatus according to the set conditions before performing beamforming.
In this embodiment, after the transmitting device and the receiving device are determined, each transmitting device sends the transmitting signals with different disturbance values to the receiving device by adjusting the respective disturbance value, the receiving device determines the maximum RSS value that can be obtained, and when the disturbance values of all transmitting devices are determined, the receiving device performs phase coupling on the transmitting signals of all transmitting devices, so that the receiving device obtains the maximum RSS value.
In a preferred embodiment, the correspondence between the current RSS value and each transmitted signal is specifically determined as follows:
let the transmission signal of the transmitter numbered i be xi＝cos(wt+θi) Wherein, thetaiIs the initial phase of the transmitting device numbered i, w is the angular frequency of the transmitted signal, and t is the time of the transmitted signal, the received signal of the receiving device can be expressed as:
In this embodiment, y, m, w, t, θiAll values of (d) can be obtained by measurement ofiThe value of (d) is objectively present, and it is necessary to determine the disturbance value δ of all transmitting devices at the time of maximum current RSS valuei。
In a preferred embodiment, the initial value of the early RSS value is a preset default value, and the preset default value ranges from (0,200).
The function of the default value is to provide an initial starting value as a basis for the decision, and in one embodiment, the maximum default value may be set to 200.
In a preferred embodiment, the step of phase coupling, by the receiving device, the transmission signals of all the transmitting devices specifically includes:
determining all disturbance values delta in each of said transmitting meansjAnd all disturbance values deltajThe weight Q corresponding to the disturbance interval tablej；
Weight Q for each of the transmitting devicesjNormalization, setting the disturbance value delta in the normalized emitting devicejCorresponding weight is WjBy the formula
Calculate to obtain Wj；
Determining a final disturbance value delta of the transmitting deviceiThe final disturbance value δiBy the formula deltai＝Wj·δjCalculating to obtain;
the received signal of the receiving device after completing the phase coupling is
In this embodiment, the weighted average of the perturbation values determined in all the transmitting devices is calculated to more accurately fit the calibration quantity of the perturbation values determined in all the transmitting devices, and the improvement of the beamforming precision is facilitated through more reasonable phase coupling.
As a further improvement of the present embodiment, in a preferred embodiment, the step S500 includes:
determining a disturbance interval table, wherein the disturbance interval table comprises disturbance values, and each disturbance value corresponds to a weight;
randomly selecting one transmitting device from all transmitting devices, and determining a disturbance value according to a comparison result of a random number of the randomly selected transmitting device and the greedy probability;
determining a disturbance value according to feedback information of a comparison result of a current RSS value and a previous RSS value of a receiving device, specifically: when the information fed back by the receiving device is that the current RSS value is larger than the early RSS value, the transmitting device keeps the disturbance values increased on the respective initial phases, gradually increases the weight of the disturbance values in the disturbance interval table, and adjusts the greedy probability to be 1, otherwise, the transmitting device discards the disturbance values increased on the respective initial phases, gradually decreases the weight of the disturbance values in the disturbance interval table, and adjusts the greedy probability;
and after all the transmitting devices determine the disturbance values, all the transmitting devices transmit the transmitting signals to the receiving devices so that the receiving devices perform phase coupling.
In this embodiment, each transmitting apparatus determines its own transmission phase, and the receiving apparatus generates single-bit feedback information according to whether or not the received signal has improved, and feeds back the single-bit feedback information to all transmitting apparatuses.
In a preferred embodiment, the determining the disturbance interval table includes:
establishing a disturbance interval of each transmitting device, and taking + delta-delta as a basic disturbance value, wherein delta belongs to (0,2 pi);
2(n +1) disturbance values of + delta, -delta, + k delta, -k delta, +2k delta, -2k delta, a., + nk delta, and nk delta are formed, and each disturbance value corresponds to a weight QjWherein n is a positive integer, k is greater than 0, and j is the sequence number of the disturbance value.
In one or more embodiments, the perturbation value is a channel offset phase value as an adjustment amount for adjusting an initial phase of a transmission signal, and the basic perturbation value is a phase value of a minimum unit.
Table 1 lists a disturbance interval table when n is 1, where each disturbance value corresponds to a weight value of 0, which is specifically shown below.
Table 1: and n is 1.
| Serial number | Disturbance value | Weight value |
| 1 | +δ | 0 |
| 2 | -δ | 0 |
| 3 | +kδ | 0 |
| 4 | -kδ | 0 |
Referring to fig. 2, a preferred embodiment of the steps of step S500 is given below:
step S510, initializing parameters, setting a weight value adjustment factor v equal to 0.3, k equal to 3, and n equal to 1, determining a disturbance interval table, where the disturbance interval table includes disturbance values, and a weight value Q corresponding to each disturbance valuejNumber j of disturbance value;
step S520, set the maximum value Zmax of Z to 10, and set the greedy probability
All transmitting devices are respectively randomly assigned a random number ziWherein z isiThe epsilon (0,1) and i is the number of the transmitting device;
step S530, judging ziIf the value is larger than ep, selecting a disturbance value randomly in the disturbance interval table with equal probability, and if not, selecting the disturbance value with the maximum weight value in the disturbance interval table;
step S540, recording the weight Q of the disturbance value selected respectively in all the transmitting devicesiRespectively increasing corresponding disturbance values on the current phase of each transmitting device;
step 550, transmitting the transmission signal added with the disturbance value in each transmitting device to a receiving device, judging whether the RSS value of the receiving device is updated according to the feedback information of the receiving device, if not, executing step 560, and if so, executing step 570;
step S560, abandon the disturbance value of each transmitting device in the current phase, and update the weight in the disturbance interval table as
Update the greedy probability of
And jumping to step S100;
step S570, reserving the disturbance value of each transmitting device on the current phase, and updating the weight Q in the disturbance interval tablej+ v, update greedy probability of
And jumping to step S100;
step S580, all transmitting devices send the transmit signals to the receiving device, so that the receiving device performs phase coupling.
Referring to fig. 3, an embodiment of the present invention further provides a distributed beamforming apparatus, including:
a determining unit 100, configured to determine a current RSS value and a corresponding relationship between the current RSS value and each transmission signal;
an updating unit 200, configured to compare the current RSS value with the previous RSS value, and when the current RSS value is greater than the previous RSS value, the receiving apparatus uses the current RSS value as the previous RSS value, and feeds back updated information about the RSS value to the transmitting apparatus; otherwise, the receiving device maintains the former RSS value unchanged and feeds back the information that the former RSS value is maintained unchanged to the transmitting device;
and a phase coupling unit 300, configured to determine the disturbance values of all transmitting devices when the current RSS value is maximum, and after all transmitting devices feed back the information that the disturbance values have been determined, the receiving device performs phase coupling on the transmission signals of all transmitting devices.
In a preferred embodiment, the correspondence between the current RSS value and each transmitted signal is specifically determined in the following manner:
let the transmission signal of the transmitter numbered i be xi＝cos(wt+θi) Wherein, θiIs the initial phase of the transmitting device numbered i, w is the angular frequency of the transmitted signal, t is the time of the transmitted signal, then the expression of the current RSS value is:
In a preferred embodiment, the initial value of the early RSS value is a preset default value, and the preset default value ranges from (0,200).
In a preferred embodiment, the phase coupling unit 300 is specifically configured to:
determining all disturbance values delta in each of said transmitting meansjAnd all disturbance values deltajThe weight Q corresponding to the disturbance interval tablej；
Weight Q for each of the transmitting devicesjNormalization, setting the disturbance value delta in the normalized emitting devicejCorresponding weight is WjBy the formula
Calculate to obtain Wj；
Determining a final disturbance value delta of the transmitting deviceiThe final disturbance value δiBy the formula deltai＝Wj·δjCalculating to obtain;
the received signal of the receiving device after completing the phase coupling is
In a preferred embodiment, the phase coupling unit 300 is further configured to:
determining a disturbance interval table, wherein the disturbance interval table comprises disturbance values, and each disturbance value corresponds to a weight;
randomly selecting one transmitting device from all transmitting devices, and determining a disturbance value according to a comparison result of a random number of the randomly selected transmitting device and the greedy probability;
determining a disturbance value according to feedback information of a comparison result of a current RSS value and a previous RSS value of a receiving device, specifically: when the information fed back by the receiving device is that the current RSS value is larger than the early RSS value, the transmitting device keeps the disturbance values increased on the respective initial phases, gradually increases the weight of the disturbance values in the disturbance interval table, and adjusts the greedy probability to be 1, otherwise, the transmitting device discards the disturbance values increased on the respective initial phases, gradually decreases the weight of the disturbance values in the disturbance interval table, and adjusts the greedy probability;
and after all the transmitting devices determine the disturbance values, all the transmitting devices feed back the information of which the disturbance values are determined. So that the receiving means are phase coupled.
While the present disclosure has been described in considerable detail and with particular reference to a few illustrative embodiments thereof, it is not intended to be limited to any such details or embodiments or any particular embodiments, but it is to be construed as effectively covering the intended scope of the disclosure by providing a broad, potential interpretation of such claims in view of the prior art with reference to the appended claims. Furthermore, the foregoing describes the disclosure in terms of embodiments foreseen by the inventor for which an enabling description was available, notwithstanding that insubstantial modifications of the disclosure, not presently foreseen, may nonetheless represent equivalent modifications thereto.
Claims (8)
1. A method of distributed beamforming, comprising:
determining a current RSS value and a corresponding relation between the current RSS value and each transmitting signal;
comparing the current RSS value with the previous RSS value, and when the current RSS value is larger than the previous RSS value, the receiving device takes the current RSS value as the previous RSS value and feeds back updated information of the RSS value to the transmitting device; otherwise, the receiving device maintains the former RSS value unchanged and feeds back information that the former RSS value is unchanged to the transmitting device;
determining the disturbance values of all transmitting devices when the current RSS value is maximum, and performing phase coupling on the transmitting signals of all transmitting devices by the receiving device after all transmitting devices feed back the information of which the disturbance values are determined;
wherein, the corresponding relationship between the current RSS value and each transmitting signal is determined by the following method:
let the transmission signal of the transmitter numbered i be xi＝cos(wt+θi) Wherein, thetaiIs the initial phase of the transmitting device numbered i, w is the angular frequency of the transmitted signal, t is the time of the transmitted signal, then the expression of the current RSS value is:
2. The distributed beamforming method according to claim 1, wherein the initial value of the early RSS value is a preset default value, and the preset default value ranges from (0,200).
3. The distributed beamforming method according to claim 1, wherein the step of phase coupling the transmission signals of all the transmitting apparatuses by the receiving apparatus is specifically:
determining all disturbance values delta in each of said transmitting meansjAnd all disturbance values deltajThe weight Q corresponding to the disturbance interval tablej；
Weight Q for each of the transmitting devicesjNormalization, setting the disturbance value delta in the normalized emitting devicejCorresponding weight is WjW is calculated by the following formulaj：
Determining a final disturbance value delta of the transmitting deviceiThe final disturbance value δiBy the formula deltai＝Wj·δjCalculating to obtain;
the received signal of the receiving device after completing the phase coupling is
Wherein 2(n +1) is the number of the disturbance values, and n is a positive integer.
4. The distributed beamforming method according to claim 3, wherein the step of determining the disturbance values of all transmitting devices when the current RSS value is maximum comprises:
determining a disturbance interval table, wherein the disturbance interval table comprises disturbance values, and each disturbance value corresponds to a weight;
randomly selecting one transmitting device from all transmitting devices, and determining a disturbance value according to a comparison result of a random number of the randomly selected transmitting device and the greedy probability;
determining a disturbance value according to feedback information of a comparison result of a current RSS value and a previous RSS value of a receiving device, specifically: when the information fed back by the receiving device is that the current RSS value is larger than the early RSS value, the transmitting device keeps the disturbance values increased on the respective initial phases, gradually increases the weight of the disturbance values in the disturbance interval table, and adjusts the greedy probability to be 1, otherwise, the transmitting device discards the disturbance values increased on the respective initial phases, gradually decreases the weight of the disturbance values in the disturbance interval table, and adjusts the greedy probability;
and after all the transmitting devices determine the disturbance values, all the transmitting devices feed back the information of which the disturbance values are determined.
5. A distributed beamforming apparatus, comprising:
the device comprises a determining unit, a receiving unit and a processing unit, wherein the determining unit is used for determining a current RSS value and a corresponding relation between the current RSS value and each transmitting signal;
the receiving device is used for receiving the RSS value of the transmitting device and sending the RSS value to the receiving device; otherwise, the receiving device maintains the former RSS value unchanged and feeds back information that the former RSS value is unchanged to the transmitting device;
the phase coupling unit is used for determining disturbance values of all transmitting devices when the current RSS value is maximum, and the receiving device performs phase coupling on transmitting signals of all transmitting devices after all transmitting devices feed back the information of which the disturbance values are determined;
the corresponding relationship between the current RSS value and each transmitted signal is specifically determined in the following manner:
let the transmission signal of the transmitter numbered i be xi＝cos(wt+θi) Wherein, thetaiIs the initial phase of the transmitting device numbered i, w is the angular frequency of the transmitted signal, t is the time of the transmitted signal, then the expression of the current RSS value is:
6. The distributed beamforming apparatus according to claim 5, comprising: the initial value of the early-stage RSS value is a preset default value, and the value range of the preset default value is (0,200).
7. The distributed beamforming apparatus according to claim 5, wherein the phase coupling unit 300 is specifically configured to:
determining all disturbance values delta in each of said transmitting meansjAnd all disturbance values deltajThe weight Q corresponding to the disturbance interval tablej；
Weight Q for each of the transmitting devicesjNormalization, setting the disturbance value delta in the normalized emitting devicejCorresponding weight is WjW is calculated by the following formulaj：
Determining a final disturbance value delta of the transmitting deviceiThe final disturbance value δiBy the formula deltai＝Wj·δjCalculating to obtain;
the received signal of the receiving device after completing the phase coupling is
Wherein 2(n +1) is the number of the disturbance values, and n is a positive integer.
8. The distributed beamforming apparatus according to claim 5, wherein the phase coupling unit is further configured to:
determining a disturbance interval table, wherein the disturbance interval table comprises disturbance values, and each disturbance value corresponds to a weight;
randomly selecting one transmitting device from all transmitting devices, and determining a disturbance value according to a comparison result of a random number of the randomly selected transmitting device and the greedy probability;
determining a disturbance value according to feedback information of a comparison result of a current RSS value and a previous RSS value of a receiving device, specifically: when the information fed back by the receiving device is that the current RSS value is larger than the early RSS value, the transmitting device keeps the disturbance values increased on the respective initial phases, gradually increases the weight of the disturbance values in the disturbance interval table, and adjusts the greedy probability to be 1, otherwise, the transmitting device discards the disturbance values increased on the respective initial phases, gradually decreases the weight of the disturbance values in the disturbance interval table, and adjusts the greedy probability;
and after all the transmitting devices determine the disturbance values, all the transmitting devices feed back the information of which the disturbance values are determined.
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