CN110121160B - Relay-based adaptive beam forming vehicle-to-vehicle communication method - Google Patents

Relay-based adaptive beam forming vehicle-to-vehicle communication method Download PDF

Info

Publication number
CN110121160B
CN110121160B CN201910199206.4A CN201910199206A CN110121160B CN 110121160 B CN110121160 B CN 110121160B CN 201910199206 A CN201910199206 A CN 201910199206A CN 110121160 B CN110121160 B CN 110121160B
Authority
CN
China
Prior art keywords
vehicle
information
precoding
coding
base station
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201910199206.4A
Other languages
Chinese (zh)
Other versions
CN110121160A (en
Inventor
滕颖蕾
曹源
张勇
潘长清
安宁
刘梦婷
魏翼飞
郭达
贾力
郑凯航
曹圆圆
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing University of Posts and Telecommunications
Original Assignee
Beijing University of Posts and Telecommunications
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing University of Posts and Telecommunications filed Critical Beijing University of Posts and Telecommunications
Priority to CN201910199206.4A priority Critical patent/CN110121160B/en
Publication of CN110121160A publication Critical patent/CN110121160A/en
Application granted granted Critical
Publication of CN110121160B publication Critical patent/CN110121160B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/46—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for vehicle-to-vehicle communication [V2V]

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention provides a relay-based adaptive beam forming vehicle-to-vehicle communication method, which comprises the following steps: receiving first information sent by a source vehicle at a first time slot by a target vehicle, wherein the first information is original information sent by the source vehicle in a first pre-coding mode; receiving, by the destination vehicle at a second time slot, decoding information corresponding to the first information and transmitted by the relay base station in a DF forwarding manner and second information transmitted by the source vehicle, where the second information is original information transmitted in a second precoding form, and the decoding information is subjected to third precoding; and based on the two-time-slot joint virtual beam forming formed by the first pre-coding, the second pre-coding and the third pre-coding, the current channel environment is self-adapted, and the communication process is completed. The method provided by the embodiment of the invention enables the communication process to be self-adaptive to channel environments in different moving states, resists Doppler influence caused by high-speed movement of the vehicle, and improves the transmission rate and reliability from the source vehicle to the target vehicle.

Description

Relay-based adaptive beam forming vehicle-to-vehicle communication method
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a relay-based adaptive beam forming vehicle-to-vehicle communication method.
Background
With the rapid development and application of wireless communication technology and mobile autonomous network, an information communication system using vehicles as nodes becomes a new direction for intelligent traffic expansion.
In the current vehicle-to-vehicle communication process, the relative speed of the vehicle is often too high, for example: the two motor vehicles run in different directions, and the relative speed is high. The doppler effect caused by too fast speed will result in low reliability and poor communication quality of vehicle-to-vehicle communication.
Therefore, there is a need for a relay-based adaptive beamforming vehicle-to-vehicle communication method to solve the above problems.
Disclosure of Invention
To address the above problems, embodiments of the present invention provide a relay-based adaptive beamforming vehicle-to-vehicle communication method that overcomes or at least partially solves the above problems.
In a first aspect, an embodiment of the present invention provides a relay-based adaptive beamforming vehicle-to-vehicle communication method, including:
receiving first information sent by a source vehicle at a first time slot by a target vehicle, wherein the first information is original information sent by the source vehicle in a first pre-coding mode;
receiving, by the destination vehicle at a second time slot, decoding information corresponding to the first information and sent by the relay base station in a DF forwarding manner and second information sent by the source vehicle, where the second information is original information sent in a second precoding form, and the decoding information is subjected to third precoding;
and based on the two-time-slot joint virtual beam forming formed by the first pre-coding, the second pre-coding and the third pre-coding, the current channel environment is self-adapted, and the communication process is completed.
A second aspect of the present invention provides a relay-based adaptive beamforming vehicle-to-vehicle communication method, including:
sending first information to a relay base station and a target vehicle in a first pre-coding mode at a first time slot, so that the relay base station sends decoding information corresponding to the first information to the target vehicle in a DF forwarding mode at a second time slot, wherein the first information is original information sent by a source vehicle in the first pre-coding mode, and the decoding information is subjected to third pre-coding;
and sending second information to the target vehicle in a second time slot, wherein the second information is original information sent in a second pre-coding mode, so that the target vehicle can adapt to the current channel environment and complete the communication process based on two-time-slot combined virtual beam forming formed by the first pre-coding mode, the second pre-coding mode and the third pre-coding mode.
The third aspect of the present invention provides a relay-based adaptive beamforming vehicle-to-vehicle communication method, including:
receiving first information sent by a source vehicle in a first time slot, wherein the first information is original information sent by the source vehicle in a first pre-coding mode;
and sending decoding information corresponding to the first information to a target vehicle in a DF forwarding mode in a second time slot, wherein the decoding information is subjected to third precoding so that the target vehicle adapts to the current channel environment and completes a communication process based on two-time-slot combined virtual beam forming formed by the first precoding, the second precoding and the third precoding, and the second precoding is carried by the source vehicle to the target vehicle in the second time slot.
Fourth aspect an embodiment of the present invention provides an electronic device, including:
a processor, a memory, a communication interface, and a bus; the processor, the memory and the communication interface complete mutual communication through the bus; the memory stores program instructions executable by the processor, the processor invoking the program instructions to enable execution of the relay-based adaptive beamforming vehicle-to-vehicle communication method described above.
According to the relay-based adaptive beam forming vehicle-to-vehicle communication method provided by the embodiment of the invention, a multi-user multi-relay base station is adopted, information retransmission is adopted at a source vehicle sending end, and beam forming vector design is adopted at a target vehicle receiving end, so that a communication process can adapt to a channel environment, Doppler influence caused by high-speed movement of vehicles is resisted, and the transmission reliability from the source vehicle to the target vehicle is improved.
Drawings
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 those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart of a relay-based adaptive beamforming vehicle-to-vehicle communication method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of another relay-based adaptive beamforming vehicle-to-vehicle communication method according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating another relay-based adaptive beamforming vehicle-to-vehicle communication method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an adaptive beamforming vehicle-to-vehicle communication system based on relay according to an embodiment of the present invention;
FIG. 5 is a block diagram of an electronic device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another relay-based adaptive beamforming vehicle-to-vehicle communication system according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another relay-based adaptive beamforming vehicle-to-vehicle communication system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, 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.
At present, in the case of high-speed driving, for example: under the scenes of high-speed rails, motor trains and the like, the reliability of communication between vehicles is low due to the Doppler effect.
In view of the above problem, fig. 1 is a schematic flowchart of a relay-based adaptive beamforming vehicle-to-vehicle communication method according to an embodiment of the present invention, and as shown in fig. 1, the method includes:
101. receiving first information sent by a source vehicle at a first time slot by a target vehicle, wherein the first information is original information sent by the source vehicle in a first pre-coding mode;
102. receiving, by the destination vehicle at a second time slot, decoding information corresponding to the first information and sent by the relay base station in a DF forwarding manner and second information sent by the source vehicle, where the second information is original information sent in a second precoding form, and the decoding information is subjected to third precoding;
103. based on the two-time slot joint virtual beam forming formed by the first pre-coding, the second pre-coding and the third pre-coding, the current channel environment is self-adapted, and the communication process is finished
It should be noted that, the implementation scenario of the embodiment of the present invention is in a multi-user-to-multi-relay scenario, for example: with K pairs of trains, i.e. from K source vehicles
Figure GDA0002467922340000041
And K target vehicles
Figure GDA0002467922340000042
The source vehicle sends information to the target vehicle through the relay base station, and the top end of the vehicle compartment is provided with a large-scale antenna, and the number of the large-scale antenna is N. The embodiment of the invention is provided with M relay base stations, namely
Figure GDA0002467922340000043
The relay base station is provided with N antennas.
Further, the execution subject of the embodiment of the present invention is the target vehicle, and the target vehicle processes the received information through the beam forming design.
The overall transmission process is shown in table 1.
Table 1 frame structure for transmitting information transmission
Figure GDA0002467922340000044
Figure GDA0002467922340000051
Specifically, in step 101, the embodiment of the present invention adopts a manner of cooperative transmission by a ground base station, and divides a communication process into two time slots (slot), and in the first time slot (slot1), the target vehicle receives the first information transmitted by the source vehicle, where the first information is the original information xsWith first precoding
Figure GDA0002467922340000052
The coded information, then the target vehicle dkThe received information is:
Figure GDA0002467922340000053
target vehicle dkThe received signal to interference plus noise ratio SINR of is:
Figure GDA0002467922340000054
the rate of information received by the target vehicle is:
Figure GDA0002467922340000055
wherein,
Figure GDA0002467922340000056
for the first time slot source vehicle skTo the target vehicle dkN is compliance
Figure GDA0002467922340000057
Gaussian noise.
Further, in step 102, that is, in the second time slot provided by the embodiment of the present invention, the target vehicle receives the second information sent by the source vehicle and the decoded information sent by the relay base station. It should be noted that the second information transmitted by the source vehicle and the decoded information transmitted by the relay base station arrive synchronously. It will be appreciated that under correct decoding conditions, the decoded information is still the first information. Both time slots actually transmit only one message, and thus the multi-antenna gain, the space diversity and the time diversity gain are comprehensively utilized. In addition to the first information sent to the target vehicle by the source vehicle in the first time slot, the first information is also sent to the relay base station, so that the relay base station can decode the first information and generate corresponding decoded information to send to the target vehicle. Similarly, the second information is subjected to a second precoding
Figure GDA0002467922340000058
The original information and the decoded information are also subjected to third pre-coding
Figure GDA0002467922340000061
Specifically, in the second time slot, the target vehicle dkThe received information is:
Figure GDA0002467922340000062
target vehicle dkThe received SINR is:
Figure GDA0002467922340000063
targetVehicle dkThe received information rate is:
Figure GDA0002467922340000064
then the source vehicle s in two time slotskTo destination vehicle dkThe effective channel capacity of (a) is:
Figure GDA0002467922340000065
wherein,
Figure GDA0002467922340000066
is the second slot source vehicle skTo the target vehicle dkThe channel gain of (a) is determined,
Figure GDA0002467922340000067
is the second slot relay base station rmTo the target vehicle dkThe channel gain of (1).
Further, the target vehicle dkReceived relay base station rmThe signals of (a) are:
Figure GDA0002467922340000068
relay base station rmTo the target vehicle dkThe SINR of (1) is as follows:
Figure GDA0002467922340000069
relay base station rmTo the target vehicle dkThe link information rate of (a) is:
Figure GDA0002467922340000071
it should be noted that, since the relay base station adopts the DF forwarding method, the forwarding rate of the second hop is required to be less than or equal to the channel capacity of the first hop, that is, the relay base station needs to transmit the second hop at the same time
Figure GDA0002467922340000072
Finally, in step 103, the embodiment of the present invention designs an adaptive channel environment at the target vehicle, i.e., the receiving end, by virtual beamforming composed of the first precoding, the second precoding, and the third precoding, thereby completing communication.
According to the vehicle-vehicle communication method provided by the embodiment of the invention, the beam forming vector design is adopted at the receiving end of the target vehicle, so that the communication process can be adaptive to the channel environment, the Doppler influence caused by high-speed movement of the vehicle is resisted, and the transmission reliability from the source vehicle to the target vehicle is improved.
On the basis of the above embodiment, the objective function of the virtual beamforming is:
Figure GDA0002467922340000073
wherein,
Figure GDA0002467922340000074
for the overall goal of virtual beamforming,
Figure GDA0002467922340000075
for the purpose of the third pre-coding,
Figure GDA0002467922340000076
for the first pre-coding to be performed,
Figure GDA0002467922340000077
for the purpose of the second pre-coding,
Figure GDA0002467922340000078
for the transmission rate of the relay base station to the target vehicle,
Figure GDA0002467922340000079
sending rate, s, for the source vehicle to the relay base stationkFor the source vehicle, PsIs the transmission power of the source vehicle, PrIs the transmission power of the relay base station.
From the above description, it can be seen that the embodiment of the present invention designs a virtual beamforming to assist signal reception. This beamforming requires an objective function to be satisfied in the design to complete the communication.
The objective function P1 for this beamforming is:
Figure GDA0002467922340000081
wherein,
Figure GDA0002467922340000082
for the overall goal of virtual beamforming,
Figure GDA0002467922340000083
for the purpose of the third pre-coding,
Figure GDA0002467922340000084
for the first pre-coding to be performed,
Figure GDA0002467922340000085
for the purpose of the second pre-coding,
Figure GDA0002467922340000086
for the transmission rate of the relay base station to the target vehicle,
Figure GDA0002467922340000087
sending rate, s, for the source vehicle to the relay base stationkFor the source vehicle, PsIs the transmission power of the source vehicle, PrIs the transmission power of the relay base station.
The above objective function can be practically expressed as:
Figure GDA0002467922340000088
on the basis of the above embodiment, the performing, based on the virtual beamforming formed by the first precoding, the second precoding, and the third precoding, the current channel environment is adapted to complete communication, including:
converting an objective function for solving the virtual beamforming into a first sub-problem solution and a second sub-problem solution;
mapping the result of the first sub-problem solution and the result of the second sub-problem solution back to the objective function.
As can be seen from the above description of the embodiments, the embodiments of the present invention essentially need to solve the objective function to obtain the parameters of the beamforming design. But due to limitations
Figure GDA0002467922340000091
The first time slot and the second time slot are coupled, and the original objective function is a non-convex problem, so that the direct solving effect is poor.
Therefore, the embodiments of the present invention will be limited to
Figure GDA0002467922340000092
And (4) relaxing, so that the problem P1 is decomposed into a first sub-problem and a second sub-problem, the first sub-problem and the second sub-problem are solved in two time slots respectively, and the first sub-problem and the second sub-problem are mapped back to the original objective function.
In particular, the first sub-problem
Figure GDA0002467922340000093
Comprises the following steps:
Figure GDA0002467922340000094
second sub-problem
Figure GDA0002467922340000095
Comprises the following steps:
Figure GDA0002467922340000096
Figure GDA0002467922340000097
C2:
Figure GDA0002467922340000098
C3:
Figure GDA0002467922340000099
on the basis of the above embodiment, the solving of the first sub-problem includes:
according to the formula
Figure GDA00024679223400000910
Computing a receive beamforming matrix Ummse；
According to UmmseValue and formula of
Figure GDA0002467922340000101
Calculating to obtain MSE matrix
Figure GDA0002467922340000102
According to
Figure GDA0002467922340000103
Value and formula of
Figure GDA0002467922340000104
Calculating to obtain a weighting matrix aopt；
According to the weighting matrix aoptJudging whether a preset condition is met, and if so, outputting first precoding
Figure GDA0002467922340000105
Specifically, the solution to the first sub-problem can be expressed as:
Figure GDA0002467922340000106
G1：
Figure GDA0002467922340000107
Figure GDA0002467922340000108
it can be approximately regarded as the minimum mean square error WMMSE problem solution, and can be expressed as:
Figure GDA0002467922340000109
Figure GDA00024679223400001010
wherein a is a weighting matrix and E is an MSE matrix.
Let U be the receive beamforming matrix, then
Figure GDA00024679223400001011
The above problem can be changed to a convex problem for which the block coordinate descent method can be used for solving. The embodiment of the invention optimizes three variables ak，
Figure GDA0002467922340000111
And U, the optimization mode is to sequentially fix two variables and update the third variable.
Thus, the optimal receiving beam forming matrix is obtained by MMSE solution:
Figure GDA0002467922340000112
wherein
Figure GDA0002467922340000113
Then
Figure GDA0002467922340000114
Further, the fixed other variable objective function is a convex function with respect to the weighting matrix a, thereby realizing the update of the weighting matrix variable:
Figure GDA0002467922340000115
since the problem is a convex problem, the convex optimization toolset can be used directly to solve:
Figure GDA0002467922340000116
Figure GDA0002467922340000117
finally outputting to obtain the first time slot precoding
Figure GDA0002467922340000118
On the basis of the above embodiment, the second sub-problem solving includes:
based on KKT (Karush-Kuhn-Tucker) condition acquisition
Figure GDA0002467922340000119
Figure GDA00024679223400001110
And
Figure GDA00024679223400001111
Figure GDA00024679223400001112
whether the difference is less than a preset value;
and if the current value is less than the preset value, the solution is completed.
For the second sub-problem can be expressed as:
Figure GDA0002467922340000121
Figure GDA0002467922340000122
C2:
Figure GDA0002467922340000123
C3:
Figure GDA0002467922340000124
Figure GDA0002467922340000125
a molecule is prepared
Figure GDA0002467922340000126
Are combined into a large block matrix
Figure GDA0002467922340000127
But the denominator
Figure GDA0002467922340000128
Cannot be combined, so cannot be formed to maximize
Figure GDA0002467922340000129
Form (a).
Considering the iterative process, two terms of denominator
Figure GDA00024679223400001210
With the value of the last iteration,
Figure GDA00024679223400001211
it also becomes a convex problem.
The above problem can be translated into:
Figure GDA00024679223400001212
further derivation yields:
Figure GDA0002467922340000131
the corresponding lagrangian expression is:
Figure GDA0002467922340000132
order to
Figure GDA0002467922340000133
Thus translating into solving the following optimization problem:
Figure GDA0002467922340000134
according to the derivation process, the embodiment of the invention only needs to input initialization for solving the second subproblem
Figure GDA0002467922340000135
Can be solved according to the utilization of KKT condition
Figure GDA0002467922340000136
Then the above-mentioned material is mixed
Figure GDA0002467922340000137
Figure GDA0002467922340000138
Whether the value is less than a preset value;
and if the current value is less than the preset value, the solution is completed. If it is greater than the preset value, re-solving
Figure GDA0002467922340000139
Finally, updating is performed based on the algorithm
Figure GDA0002467922340000141
Then will be
Figure GDA0002467922340000142
Projection to C4:
Figure GDA0002467922340000143
output of
Figure GDA0002467922340000144
Fig. 2 is a schematic flow chart of another relay-based adaptive beamforming vehicle-to-vehicle communication method according to an embodiment of the present invention, as shown in fig. 2, including:
201. sending first information to a relay base station and a target vehicle in a first pre-coding mode at a first time slot, so that the relay base station sends decoding information corresponding to the first information to the target vehicle in a DF forwarding mode at a second time slot, wherein the first information is original information sent by a source vehicle in the first pre-coding mode, and the decoding information is subjected to third pre-coding;
202. and sending second information to the target vehicle in a second time slot, wherein the second information is original information sent in a second pre-coding mode, so that the target vehicle can adapt to the current channel environment and complete the communication process based on two-time-slot combined virtual beam forming formed by the first pre-coding mode, the second pre-coding mode and the third pre-coding mode.
It should be noted that the execution subject of the embodiment of the present invention is the source vehicle.
In step 201, in the embodiment of the present invention, a ground base station cooperative transmission mode is adopted to implement vehicle-to-vehicle communication, a communication process is divided into two time slots, and frame structures of all communication nodes are synchronized. In the first time slot, the source vehicle skWill be precoded with the first
Figure GDA0002467922340000145
The mode of (2) sending information xsTo relay base station and target vehicle dk. If the first information sent to the relay base station is successfully decoded by the relay base station, the relay base station forwards the decoded information to the target vehicle in a DF forwarding mode, and the decoded information relay base station carries out thirdPrecoding
Figure GDA0002467922340000146
And (6) processing.
Further, in step 202, the source vehicle retransmits in a second time slot after the first transmission is completed, and the source vehicle skTo user dkWith second precoding
Figure GDA0002467922340000147
Perform retransmission xsAnd at the same time, the relay base station rmWill also be directed to the target vehicle dkWith third precoding
Figure GDA0002467922340000148
Transmits the decoded information so that the base station r is relayed in the second slotmAnd source vehicle skTo the target vehicle dkThe transmitted information is synchronous, virtual multi-antenna beam forming is formed, and the original transmitted information amount is set to be 1, namely | | xs||21, enabling the target vehicle to accomplish good reception of information through virtual multi-antenna beamforming.
According to the vehicle-to-vehicle communication method provided by the embodiment of the invention, information retransmission is adopted at the sending end of the source vehicle, so that the receiving end of the target vehicle can adapt to a channel environment through the beam forming vector design, the Doppler influence caused by high-speed movement of the vehicle is resisted, and the transmission reliability from the source vehicle to the target vehicle is improved.
On the basis of the above embodiment, the method further includes:
and determining the transmitted relay base station according to the signal-to-interference-plus-noise ratio.
As can be seen from the content of the foregoing embodiments, in a scenario of the embodiments of the present invention, there are multiple relay base stations, and therefore, in an actual communication process, an appropriate relay base station needs to be selected to complete communication, a selection standard of the embodiments of the present invention is selected according to a signal to interference plus noise ratio SINR, and a specific formula is as follows:
Figure GDA0002467922340000151
to pair
Figure GDA0002467922340000152
Fig. 3 is a flowchart of another relay-based adaptive beamforming vehicle-to-vehicle communication method according to an embodiment of the present invention, as shown in fig. 3, including:
301. receiving first information sent by a source vehicle in a first time slot, wherein the first information is original information sent by the source vehicle in a first pre-coding mode;
302. and sending decoding information corresponding to the first information to a target vehicle in a DF forwarding mode in a second time slot, wherein the decoding information is subjected to third precoding so that the target vehicle adapts to the current channel environment and completes a communication process based on two-time-slot combined virtual beam forming formed by the first precoding, the second precoding and the third precoding, and the second precoding is carried by the source vehicle to the target vehicle in the second time slot.
It should be noted that the main execution subject of the embodiment of the present invention is a relay base station.
As can be seen from the content of the above embodiment, the embodiment of the present invention divides the communication process into the first time slot and the second time slot, and sets the relay base station to complete information forwarding.
Specifically, in step 301, the first timeslot relay base station receives the first information sent from the source vehicle, where the first information is subjected to first precoding
Figure GDA0002467922340000153
Relay rmThe received signal may be expressed as:
Figure GDA0002467922340000154
source vehicle skSINR to relay base station is:
Figure GDA0002467922340000155
source vehicle skThe rate to the relay base station is:
Figure GDA0002467922340000161
wherein,
Figure GDA0002467922340000162
as a source vehicle skTo the relay base station rmThe channel gain of (1).
Further, in step 302, in the second timeslot, the relay base station forwards the decoding information corresponding to the first information in a DF forwarding manner. The decoded information is subjected to a third precoding
Figure GDA0002467922340000163
Wherein, the relay base station rmTarget vehicle dkThe SINR of the link is:
Figure GDA0002467922340000164
relay base station rmTarget vehicle dkThe link information rate is:
Figure GDA0002467922340000165
it should be noted that, because the DF forwarding scheme is provided in the embodiment of the present invention, in order to correctly decode and obtain information, it is necessary to ensure that the forwarding rate of the second hop is less than or equal to the channel capacity of the first hop, that is, it is required to ensure that the forwarding rate of the second hop is less than or equal to the channel capacity of the first hop, that is, the DF forwarding
Figure GDA0002467922340000166
According to the vehicle-to-vehicle communication method provided by the embodiment of the invention, the DF forwarding is carried out by adopting the multi-user multi-relay base station, so that the beam forming is realized at the receiving end of the target vehicle, the communication process can adapt to the channel environment, the Doppler influence caused by the high-speed movement of the vehicle is resisted, and the transmission reliability from the source vehicle to the target vehicle is improved.
On the basis of the above embodiment, after receiving the first information transmitted by the source vehicle in the first time slot, the method further includes:
judging whether the first information is decoded successfully;
and if the decoding is successful, transmitting the decoding information corresponding to the first information to the target vehicle in a DF forwarding mode in a second time slot.
As can be seen from the content of the foregoing embodiment, the relay base station provided in the embodiment of the present invention needs to meet the requirement that the forwarding rate of the second hop is less than or equal to the channel capacity of the first hop, that is, the relay base station needs to meet the requirement that the forwarding rate of the second hop is less than or equal to the channel capacity of the first hop, that is
Figure GDA0002467922340000175
And correspondingly, the embodiment of the invention needs to judge whether the first information is decoded successfully, and if the first information is decoded successfully, the decoding information corresponding to the first information can be sent to the target vehicle in a DF forwarding mode in the second time slot.
As can be seen from the embodiments described in fig. 1, fig. 2, and fig. 3, in order to improve reliability, the embodiment of the present invention adopts a transmission method in which the ground base station cooperates, and in the first time slot, the source vehicle skWith first precoding
Figure GDA0002467922340000171
Sending information xsThe relay base station transmits the data to the relay base station and the target vehicle in a DF (delay-loss) transmission mode, and the relay base station r in the second time slot transmits the data on the premise of successfully decoding the data by the relay base stationmTo the target vehicle dkWith third precoding
Figure GDA0002467922340000172
Transmitting decoded information while the user s iskTo user dkWith second precoding
Figure GDA0002467922340000173
Perform retransmission xsThat isRelay base station r in the second time slotmSource vehicle skTo the destination train dkThe transmitted information is synchronized to form virtual multi-antenna beam forming
Figure GDA0002467922340000174
Suppose the original sending information quantity is 1, i.e. | | xs||2And 1, realizing information reception of a receiving end.
Fig. 4 is a schematic structural diagram of an adaptive beamforming vehicle-to-vehicle communication system based on relay according to an embodiment of the present invention, as shown in fig. 4, including: a first receiving module 401, a second receiving module 402, and a beamforming design module 403, wherein:
a first receiving module 401, configured to receive, at a first time slot, first information sent by a source vehicle, where the first information is original information sent by the source vehicle in a first pre-coding form;
a second receiving module 402, configured to receive, at a second timeslot, the decoding information corresponding to the first information and the second information sent by the source vehicle, where the decoding information is sent by the relay base station in a DF forwarding manner, and the second information is original information sent in a second precoding form, where the decoding information is subjected to third precoding;
a beam forming design module 403, configured to perform two-slot joint virtual beam forming based on the first precoding, the second precoding, and the third precoding, so as to adapt to a current channel environment and complete a communication process.
Specifically, how to implement the technical solution of the vehicle-to-vehicle communication method embodiment shown in fig. 1 can be implemented through the receiving module 401, the second receiving module 402, and the beam forming design module 403, which implement the principle and the technical effect are similar, and are not described herein again.
An embodiment of the present invention provides an electronic device, including: at least one processor; and at least one memory communicatively coupled to the processor, wherein:
fig. 5 is a block diagram of an electronic device according to an embodiment of the present invention, and referring to fig. 5, the electronic device includes: a processor (processor)501, a communication Interface (Communications Interface)502, a memory (memory)503, and a bus 504, wherein the processor 501, the communication Interface 502, and the memory 503 are configured to communicate with each other via the bus 504. The processor 501 may call logic instructions in the memory 503 to perform the following method: receiving first information sent by a source vehicle at a first time slot by a target vehicle, wherein the first information is original information sent by the source vehicle in a first pre-coding mode; receiving, by the destination vehicle at a second time slot, decoding information corresponding to the first information and sent by the relay base station in a DF forwarding manner and second information sent by the source vehicle, where the second information is original information sent in a second precoding form, and the decoding information is subjected to third precoding; and based on the two-time-slot joint virtual beam forming formed by the first pre-coding, the second pre-coding and the third pre-coding, the current channel environment is self-adapted, and the communication process is completed.
An embodiment of the present invention discloses a computer program product, which includes a computer program stored on a non-transitory computer readable storage medium, the computer program including program instructions, when the program instructions are executed by a computer, the computer can execute the methods provided by the above method embodiments, for example, the method includes: receiving first information sent by a source vehicle at a first time slot by a target vehicle, wherein the first information is original information sent by the source vehicle in a first pre-coding mode; receiving, by the destination vehicle at a second time slot, decoding information corresponding to the first information and sent by the relay base station in a DF forwarding manner and second information sent by the source vehicle, where the second information is original information sent in a second precoding form, and the decoding information is subjected to third precoding; and based on the two-time-slot joint virtual beam forming formed by the first pre-coding, the second pre-coding and the third pre-coding, the current channel environment is self-adapted, and the communication process is completed.
Embodiments of the present invention provide a non-transitory computer-readable storage medium, which stores computer instructions, where the computer instructions cause the computer to perform the methods provided by the above method embodiments, for example, the methods include: receiving first information sent by a source vehicle at a first time slot by a target vehicle, wherein the first information is original information sent by the source vehicle in a first pre-coding mode; receiving, by the destination vehicle at a second time slot, decoding information corresponding to the first information and sent by the relay base station in a DF forwarding manner and second information sent by the source vehicle, where the second information is original information sent in a second precoding form, and the decoding information is subjected to third precoding; and based on the two-time-slot joint virtual beam forming formed by the first pre-coding, the second pre-coding and the third pre-coding, the current channel environment is self-adapted, and the communication process is completed.
Fig. 6 is a schematic structural diagram of another relay-based adaptive beamforming vehicle-to-vehicle communication system according to an embodiment of the present invention, as shown in fig. 6, including: a first sending module 601 and a second sending module 602, wherein:
a first sending module 601, configured to send first information to a relay base station and a target vehicle in a first pre-coding manner at a first time slot, so that the relay base station sends decoding information corresponding to the first information to the target vehicle in a DF forwarding manner at a second time slot, where the first information is original information sent by a source vehicle in the first pre-coding manner, and the decoding information is subjected to third pre-coding;
a second sending module 602, configured to send second information to the target vehicle in a second time slot, where the second information is original information sent in a second precoding manner, so that the target vehicle performs virtual beamforming in combination with two time slots formed by the first precoding, the second precoding, and the third precoding, adapts to a current channel environment, and completes a communication process.
Specifically, how to use the first sending module 601 and the second sending module 602 to execute the technical scheme of the vehicle-to-vehicle communication method embodiment shown in fig. 2 is similar, and the implementation principle and the technical effect are similar, and are not described herein again.
An embodiment of the present invention provides an electronic device, including: at least one processor; and at least one memory communicatively coupled to the processor, wherein:
fig. 5 is a block diagram of an electronic device according to an embodiment of the present invention, and referring to fig. 5, the electronic device includes: a processor (processor)501, a communication Interface (Communications Interface)502, a memory (memory)503, and a bus 504, wherein the processor 501, the communication Interface 502, and the memory 503 are configured to communicate with each other via the bus 504. The processor 501 may call logic instructions in the memory 503 to perform the following method: sending first information to a relay base station and a target vehicle in a first pre-coding mode at a first time slot, so that the relay base station sends decoding information corresponding to the first information to the target vehicle in a DF forwarding mode at a second time slot, wherein the first information is original information sent by a source vehicle in the first pre-coding mode, and the decoding information is subjected to third pre-coding; and sending second information to the target vehicle in a second time slot, wherein the second information is original information sent in a second pre-coding mode, so that the target vehicle can adapt to the current channel environment and complete the communication process based on two-time-slot combined virtual beam forming formed by the first pre-coding mode, the second pre-coding mode and the third pre-coding mode.
An embodiment of the present invention discloses a computer program product, which includes a computer program stored on a non-transitory computer readable storage medium, the computer program including program instructions, when the program instructions are executed by a computer, the computer can execute the methods provided by the above method embodiments, for example, the method includes: sending first information to a relay base station and a target vehicle in a first pre-coding mode at a first time slot, so that the relay base station sends decoding information corresponding to the first information to the target vehicle in a DF forwarding mode at a second time slot, wherein the first information is original information sent by a source vehicle in the first pre-coding mode, and the decoding information is subjected to third pre-coding; and sending second information to the target vehicle in a second time slot, wherein the second information is original information sent in a second pre-coding mode, so that the target vehicle can adapt to the current channel environment and complete the communication process based on two-time-slot combined virtual beam forming formed by the first pre-coding mode, the second pre-coding mode and the third pre-coding mode.
Embodiments of the present invention provide a non-transitory computer-readable storage medium, which stores computer instructions, where the computer instructions cause the computer to perform the methods provided by the above method embodiments, for example, the methods include: sending first information to a relay base station and a target vehicle in a first pre-coding mode at a first time slot, so that the relay base station sends decoding information corresponding to the first information to the target vehicle in a DF forwarding mode at a second time slot, wherein the first information is original information sent by a source vehicle in the first pre-coding mode, and the decoding information is subjected to third pre-coding; and sending second information to the target vehicle in a second time slot, wherein the second information is original information sent in a second pre-coding mode, so that the target vehicle can adapt to the current channel environment and complete the communication process based on two-time-slot combined virtual beam forming formed by the first pre-coding mode, the second pre-coding mode and the third pre-coding mode.
Fig. 7 is a schematic structural diagram of another relay-based adaptive beamforming vehicle-to-vehicle communication system according to an embodiment of the present invention, as shown in fig. 7, including: a third receiving module 701 and a forwarding module 702, wherein:
a third receiving module 701, configured to receive, in a first time slot, first information sent by a source vehicle, where the first information is original information sent by the source vehicle in a first pre-coding form;
a forwarding module 702, configured to send, in a second timeslot, decoding information corresponding to the first information to a target vehicle in a DF forwarding manner, where the decoding information is subjected to third precoding, so that the target vehicle adapts to a current channel environment based on two-timeslot joint virtual beamforming formed by the first precoding, the second precoding, and the third precoding, and completes a communication process, where the second precoding is carried by the source vehicle to the target vehicle in the second timeslot.
Specifically, how to use the third receiving module 701 and the forwarding module 702 to execute the technical scheme of the vehicle-to-vehicle communication method embodiment shown in fig. 3 is similar, and the implementation principle and the technical effect are similar, and are not described herein again.
An embodiment of the present invention provides an electronic device, including: at least one processor; and at least one memory communicatively coupled to the processor, wherein:
fig. 5 is a block diagram of an electronic device according to an embodiment of the present invention, and referring to fig. 5, the electronic device includes: a processor (processor)501, a communication Interface (Communications Interface)502, a memory (memory)503, and a bus 504, wherein the processor 501, the communication Interface 502, and the memory 503 are configured to communicate with each other via the bus 504. The processor 501 may call logic instructions in the memory 503 to perform the following method: receiving first information sent by a source vehicle in a first time slot, wherein the first information is original information sent by the source vehicle in a first pre-coding mode; and sending decoding information corresponding to the first information to a target vehicle in a DF forwarding mode in a second time slot, wherein the decoding information is subjected to third precoding so that the target vehicle adapts to the current channel environment and completes a communication process based on two-time-slot combined virtual beam forming formed by the first precoding, the second precoding and the third precoding, and the second precoding is carried by the source vehicle to the target vehicle in the second time slot.
An embodiment of the present invention discloses a computer program product, which includes a computer program stored on a non-transitory computer readable storage medium, the computer program including program instructions, when the program instructions are executed by a computer, the computer can execute the methods provided by the above method embodiments, for example, the method includes: receiving first information sent by a source vehicle in a first time slot, wherein the first information is original information sent by the source vehicle in a first pre-coding mode; and sending decoding information corresponding to the first information to a target vehicle in a DF forwarding mode in a second time slot, wherein the decoding information is subjected to third precoding so that the target vehicle adapts to the current channel environment and completes a communication process based on two-time-slot combined virtual beam forming formed by the first precoding, the second precoding and the third precoding, and the second precoding is carried by the source vehicle to the target vehicle in the second time slot.
Embodiments of the present invention provide a non-transitory computer-readable storage medium, which stores computer instructions, where the computer instructions cause the computer to perform the methods provided by the above method embodiments, for example, the methods include: receiving first information sent by a source vehicle in a first time slot, wherein the first information is original information sent by the source vehicle in a first pre-coding mode; and sending decoding information corresponding to the first information to a target vehicle in a DF forwarding mode in a second time slot, wherein the decoding information is subjected to third precoding so that the target vehicle adapts to the current channel environment and completes a communication process based on two-time-slot combined virtual beam forming formed by the first precoding, the second precoding and the third precoding, and the second precoding is carried by the source vehicle to the target vehicle in the second time slot.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to each embodiment or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (7)

1. A relay-based adaptive beamforming vehicle-to-vehicle communication method is characterized by comprising the following steps:
receiving first information sent by a source vehicle at a first time slot by a target vehicle, wherein the first information is original information sent by the source vehicle in a first pre-coding mode;
receiving, by the destination vehicle at a second time slot, decoding information corresponding to the first information and sent by the relay base station in a DF forwarding manner and second information sent by the source vehicle, where the second information is original information sent in a second precoding form, and the decoding information is subjected to third precoding;
based on the two-time slot joint virtual beam forming formed by the first pre-coding, the second pre-coding and the third pre-coding, the current channel environment is self-adapted, and the communication process is completed;
the two-slot joint virtual beamforming objective function is as follows:
Figure FDA0002467922330000011
wherein,
Figure FDA0002467922330000012
for the overall goal of virtual beamforming,
Figure FDA0002467922330000013
for the purpose of the third pre-coding,
Figure FDA0002467922330000014
for the first pre-coding to be performed,
Figure FDA0002467922330000015
for the purpose of the second pre-coding,
Figure FDA0002467922330000016
for the transmission rate of the relay base station to the target vehicle,
Figure FDA0002467922330000017
sending rate, s, for the source vehicle to the relay base stationkFor the source vehicle, PsIs the transmission power of the source vehicle, PrIs the transmission power of the relay base station; the virtual beamforming based on the first precoding, the second precoding, and the third precoding adapts to the current channel environment to complete communication, including:
converting an objective function for solving the virtual beamforming into a first sub-problem solution and a second sub-problem solution;
mapping the result of solving the first sub-problem and the result of solving the second sub-problem back to the objective function to complete communication;
the first sub-problem solving, comprising:
according to the formula
Figure FDA0002467922330000021
Computing a receive beamforming matrix Ummse；
According to UmmseValue and formula of
Figure FDA0002467922330000022
Calculating to obtain MSE matrix
Figure FDA0002467922330000023
According to
Figure FDA0002467922330000024
Value and formula of
Figure FDA0002467922330000025
Calculating to obtain a weighting matrix aopt；
According to the weighting matrix aoptJudging whether a preset condition is met, and if so, outputting first precoding
Figure FDA0002467922330000026
2. The method of claim 1, wherein the second sub-problem solving comprises:
KKT-based conditional access
Figure FDA0002467922330000027
Will be described in
Figure FDA0002467922330000028
Mapping to a formula
Figure FDA0002467922330000029
In, judgment
Figure FDA00024679223300000210
And
Figure FDA00024679223300000211
whether the difference is less than a preset value;
and if the current value is less than the preset value, the solution is completed.
3. A relay-based adaptive beamforming vehicle-to-vehicle communication method is characterized by comprising the following steps:
sending first information to a relay base station and a target vehicle in a first pre-coding mode at a first time slot, so that the relay base station sends decoding information corresponding to the first information to the target vehicle in a DF forwarding mode at a second time slot, wherein the first information is original information sent by a source vehicle in the first pre-coding mode, and the decoding information is subjected to third pre-coding;
sending second information to the target vehicle in a second time slot, wherein the second information is original information sent in a second pre-coding mode, so that the target vehicle can adapt to the current channel environment and complete a communication process based on two-time-slot combined virtual beam forming formed by first pre-coding, second pre-coding and third pre-coding;
the two-slot joint virtual beamforming objective function is as follows:
Figure FDA0002467922330000031
wherein,
Figure FDA0002467922330000032
for the overall goal of virtual beamforming,
Figure FDA0002467922330000033
for the purpose of the third pre-coding,
Figure FDA0002467922330000034
for the first pre-coding to be performed,
Figure FDA0002467922330000035
for the purpose of the second pre-coding,
Figure FDA0002467922330000036
for the transmission rate of the relay base station to the target vehicle,
Figure FDA0002467922330000037
sending rate, s, for the source vehicle to the relay base stationkFor the source vehicle, PsIs the transmission power of the source vehicle, PrIs the transmission power of the relay base station;
the virtual beamforming based on the first precoding, the second precoding, and the third precoding adapts to the current channel environment to complete communication, including:
converting an objective function for solving the virtual beamforming into a first sub-problem solution and a second sub-problem solution;
mapping the result of solving the first sub-problem and the result of solving the second sub-problem back to the objective function to complete communication;
the first sub-problem solving, comprising:
according to the formula
Figure FDA0002467922330000038
Computing a receive beamforming matrix Ummse；
According to UmmseValue and formula of
Figure FDA0002467922330000041
Calculating to obtain MSE matrix
Figure FDA0002467922330000042
According to
Figure FDA0002467922330000043
Value and formula of
Figure FDA0002467922330000044
Calculating to obtain a weighting matrix aopt；
According to the weighting matrix aoptJudging whether a preset condition is met, and if so, outputting first precoding
Figure FDA0002467922330000045
4. The method of claim 3, further comprising:
and determining the transmitted relay base station according to the signal-to-interference-plus-noise ratio.
5. A relay-based adaptive beamforming vehicle-to-vehicle communication method is characterized by comprising the following steps:
receiving first information sent by a source vehicle in a first time slot, wherein the first information is original information sent by the source vehicle in a first pre-coding mode;
sending decoding information corresponding to the first information to a target vehicle in a DF forwarding mode in a second time slot, wherein the decoding information is subjected to third precoding so that the target vehicle adapts to the current channel environment and completes a communication process based on two-time-slot combined virtual beam forming formed by the first precoding, the second precoding and the third precoding, and the second precoding is carried by the source vehicle to the target vehicle in the second time slot;
the two-slot joint virtual beamforming objective function is as follows:
Figure FDA0002467922330000046
wherein,
Figure FDA0002467922330000047
for the overall goal of virtual beamforming,
Figure FDA0002467922330000048
for the purpose of the third pre-coding,
Figure FDA0002467922330000049
for the first pre-coding to be performed,
Figure FDA00024679223300000410
for the purpose of the second pre-coding,
Figure FDA00024679223300000411
for the transmission rate of the relay base station to the target vehicle,
Figure FDA0002467922330000051
sending rate, s, for the source vehicle to the relay base stationkFor the source vehicle, PsIs the transmission power of the source vehicle, PrIs the transmission power of the relay base station;
the virtual beamforming based on the first precoding, the second precoding, and the third precoding adapts to the current channel environment to complete communication, including:
converting an objective function for solving the virtual beamforming into a first sub-problem solution and a second sub-problem solution;
mapping the result of solving the first sub-problem and the result of solving the second sub-problem back to the objective function to complete communication;
the first sub-problem solving, comprising:
according to the formula
Figure FDA0002467922330000052
Computing a receive beamforming matrix Ummse；
According to UmmseValue and formula of
Figure FDA0002467922330000053
Calculating to obtain MSE matrix
Figure FDA0002467922330000054
According to
Figure FDA0002467922330000055
Value and formula of
Figure FDA0002467922330000056
Calculating to obtain a weighting matrix aopt；
According to the weighting matrix aoptJudging whether a preset condition is met, and if so, outputting first precoding
Figure FDA0002467922330000057
6. The method of claim 5, wherein after the receiving the first information transmitted by the source vehicle in the first time slot, the method further comprises:
judging whether the first information is decoded successfully;
and if the decoding is successful, transmitting the decoding information corresponding to the first information to the target vehicle in a DF forwarding mode in a second time slot.
7. An electronic device, comprising a memory and a processor, wherein the processor and the memory communicate with each other via a bus; the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 1 to 6.
CN201910199206.4A 2019-03-15 2019-03-15 Relay-based adaptive beam forming vehicle-to-vehicle communication method Active CN110121160B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910199206.4A CN110121160B (en) 2019-03-15 2019-03-15 Relay-based adaptive beam forming vehicle-to-vehicle communication method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910199206.4A CN110121160B (en) 2019-03-15 2019-03-15 Relay-based adaptive beam forming vehicle-to-vehicle communication method

Publications (2)

Publication Number Publication Date
CN110121160A CN110121160A (en) 2019-08-13
CN110121160B true CN110121160B (en) 2020-07-24

Family

ID=67520492

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910199206.4A Active CN110121160B (en) 2019-03-15 2019-03-15 Relay-based adaptive beam forming vehicle-to-vehicle communication method

Country Status (1)

Country Link
CN (1) CN110121160B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2022189822A1 (en) * 2021-03-10 2022-09-15

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106788637A (en) * 2016-12-22 2017-05-31 电子科技大学 The combined optimization method of transmission mode and transmission beam in a kind of D2D communications
CN109088891A (en) * 2018-10-18 2018-12-25 南通大学 Legal listening method based on safety of physical layer under a kind of more relay systems

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2766061C (en) * 2009-06-19 2015-02-17 Research In Motion Limited Transparent relay using dual-layer beam forming association procedures
CN102882569B (en) * 2012-09-26 2015-03-04 清华大学 Decode-and-forward strategy based multi-antenna relay beam forming method
CN103067127B (en) * 2012-12-24 2015-09-23 南京邮电大学 Distributed decoding under asymmetric speed forwards bi-directional relaying system of selection
CN104779987B (en) * 2015-04-17 2018-12-18 北京邮电大学 A kind of relay transmission method of extensive multiple-input-multiple-output communication system
WO2018227752A1 (en) * 2017-06-14 2018-12-20 华为技术有限公司 Data transmission method and related device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106788637A (en) * 2016-12-22 2017-05-31 电子科技大学 The combined optimization method of transmission mode and transmission beam in a kind of D2D communications
CN109088891A (en) * 2018-10-18 2018-12-25 南通大学 Legal listening method based on safety of physical layer under a kind of more relay systems

Also Published As

Publication number Publication date
CN110121160A (en) 2019-08-13

Similar Documents

Publication Publication Date Title
US8532212B2 (en) Wireless communication system, wireless communication device, wireless communication method and computer program
Ji et al. Spectral efficiency enhanced cooperative device-to-device systems with NOMA
US20170141829A1 (en) Data Transmission Method and Apparatus
CN104601209A (en) Cooperated multi-point transmission method suitable for 3D-MIMO (Multiple Input Multiple Output) system
JP2017130949A (en) Method and system for unified rate adaptation for SU-BF and MU-MIMO operation
CN110535517B (en) Beam forming calculation method and system for vehicle-to-vehicle communication
CN114245348A (en) Multi-service joint transmission method and device based on non-cellular network architecture
WO2014120609A1 (en) Method and system for boosting transmission settings based on signal to interference and noise ratio
CN105680965A (en) Obtaining method and apparatus for simultaneous information and power transfer type transceiver model
CN110121160B (en) Relay-based adaptive beam forming vehicle-to-vehicle communication method
US20120196634A1 (en) Wireless communication system, mobile terminal and collaborative communication method
CN118018074A (en) Communication method, communication device, computer readable storage medium and related system
Kumar et al. Impact of channel correlation on network coded cooperation with two sources
CN108092928B (en) Aggregation interference-oriented interference management method, hybrid cellular network and wireless local area network
CN102137502B (en) User scheduling method of wireless bidirectional trunk network coding system
CN102983933B (en) Signaling method, signal decoding method, device and system
CN115549745B (en) RIS phase shift design method, RIS phase shift design device, RIS phase shift design computer equipment and RIS phase shift storage medium
CN103401657A (en) Non-differential distributed space-time coding method for cooperative communication partially-coherent network
CN103236878A (en) Maximum ratio combining receiving vector estimation-based coordinated beamforming method
CN103236879A (en) Coordinated beam forming method on basis of MRC-ZF (Maximum Ratio Combining to Zero Forcing) receiving vector estimation
CN102415120B (en) Coordinated multipoint transmission method and apparatus therefor
CN109474318A (en) Method for precoding comprising the link that direct transfers under the two-way MIMO relay system of multi-user
CN104066141B (en) A kind of collaborative communication method and system based on full space-time network code
KR20090056339A (en) Optional signal control apparatus and method for distributed antenna system
US20240204856A1 (en) Full-duplex antenna and communication node

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant