CN110225537B - Cooperative wireless network power distribution method based on wireless energy collection - Google Patents

Cooperative wireless network power distribution method based on wireless energy collection Download PDF

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CN110225537B
CN110225537B CN201910505314.XA CN201910505314A CN110225537B CN 110225537 B CN110225537 B CN 110225537B CN 201910505314 A CN201910505314 A CN 201910505314A CN 110225537 B CN110225537 B CN 110225537B
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CN110225537A (en
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金明
孙铭阳
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Ningbo University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention discloses a cooperative wireless network power distribution method based on wireless energy collection, which continuously determines the minimum energy required by an energy collection user in an iterative manner; continuously and iteratively determining the transmission power distributed to the cooperative user transmitter on the selected sub-channel in the 1 st sub-time slot, and further calculating the energy collected by the energy collecting user transmitter; when the obtained energy is not less than the required minimum energy, continuously and iteratively determining the transmitting power distributed on the selected sub-channel in the 2 nd sub-time slot by the transmitter of the energy collecting user, and further calculating the actual throughput of the energy collecting user; when the actual throughput is not less than the minimum throughput, continuously and iteratively determining the transmission power distributed to the cooperative user transmitter on the selected sub-channel in the 2 nd sub-time slot; the method has the advantages of solving the problem of limited energy of the wireless network without sustainable energy, performing efficient resource allocation on channels and energy, and having low computational complexity.

Description

Cooperative wireless network power distribution method based on wireless energy collection
Technical Field
The invention relates to a power distribution technology in a wireless network, in particular to a cooperative wireless network power distribution method based on wireless energy collection.
Background
With the rapid development of wireless communication technology, the energy-limited problem of wireless networks has become a great challenge to limit the development of wireless communication technology. Aiming at the problem of limited energy of a wireless network, two ideas mainly exist in the industry at present, the first idea is to use a battery with larger capacity, and the method is limited by the shape and size of the battery; another is to introduce wireless energy harvesting technology to solve the problem of insufficient energy of wireless networks. In recent years, wireless energy collection has gone up the history stage, and unlike the conventional battery-driven communication system, a wireless network can obtain energy such as solar energy, wind energy, tidal energy, etc. from the environment through wireless energy collection technology. However, the capture of such energy is greatly influenced by geographical and weather factors, and has unstable characteristics, so that wireless energy collection from reliable radio frequency signals is receiving more and more attention. Meanwhile, with the explosive growth of wireless communication devices, the demand of various wireless network systems for network throughput is also increasing. Many users may experience poor quality of service performance due to channel losses such as path loss, shadowing, and small scale fading.
To solve these problems, Ding Xu et al, published in 2017 in IEEE Wireless Communications Letters, in an article "Cooperative Resource Allocation in Radio Networks With Wireless capability of main Users" (Cooperative Resource Allocation of Cognitive Radio Networks) proposes a sub-channel power Allocation method, which divides the whole communication time slot into two sub-time slots, in the first sub-time slot, all power of the Cooperative Users is allocated to one sub-channel for communication, and meanwhile, the energy collecting Users collect energy from the Radio frequency signals of the Cooperative Users; in the second sub-slot, the cooperative user and the energy-harvesting user are simultaneously communicating. The method needs to optimize the time length of two sub-time slots by a one-dimensional search algorithm, so that the method has higher complexity; the method allocates all the power of the cooperative users to one sub-channel in the first sub-time slot, which indicates that the cooperative users are not fully optimized in the first sub-time slot; in each iteration process when the method allocates power to the cooperative users and the energy collecting users in the second sub-time slot, the cooperative users and the energy collecting users need to reallocate power, so that the method has high computational complexity.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a cooperative wireless network power distribution method based on wireless energy collection, which can solve the problem of limited energy of a wireless network without sustainable energy, and can perform efficient resource distribution on channels and energy so as to achieve the purpose of maximizing the throughput of cooperative users and reduce the computational complexity.
The technical scheme adopted by the invention for solving the technical problems is as follows: a cooperative wireless network power distribution method based on wireless energy collection is characterized by comprising the following steps:
step 1, in a cooperative wireless network, a cooperative user and an energy collecting user exist, the cooperative user consists of a cooperative user transmitter and a cooperative user receiver, and the energy collecting user consists of an energy collecting user transmitter and an energy collecting user receiver; recording the bandwidth of a total channel of the cooperative wireless network as B, and recording the time length of one time slot of the cooperative wireless network as tau; the total channel is then divided equally into N sub-channels, each having a bandwidth of
Figure BDA0002091647610000021
Noise power spectral density of total channel and sub-channelIs marked as n0(ii) a Dividing the time slot into two sub-time slots, and recording the time length of the 1 st sub-time slot as tau1Let the time length of the 2 nd sub-slot be τ2Satisfy τ ═ τ1+τ2(ii) a In the 1 st sub-time slot, the cooperative user transmitter and the cooperative user receiver communicate through a sub-channel, and the energy collecting user transmitter collects energy from a radio frequency signal transmitted by the cooperative user transmitter; in the 2 nd sub-time slot, the cooperative user transmitter and the cooperative user receiver communicate through a sub-channel, meanwhile, the energy collecting user transmitter and the energy collecting user receiver communicate through a sub-channel, and the sub-channel used by the cooperative user for communication is different from the sub-channel used by the energy collecting user for communication; wherein, the unit of B is Hz, the unit of tau is second, N is a positive integer, and N is 2kK is a positive integer greater than or equal to 1,
Figure BDA0002091647610000022
in units of Hz, n0In dBm/Hz,. tau.1∈[0.3τ,0.5τ]，τ1And τ2In units of seconds;
step 2, order
Figure BDA0002091647610000023
A set of sequence numbers representing subchannels allocated to energy harvesting users for communication in the 2 nd sub-slot; then initializing
Figure BDA0002091647610000031
Make it
Figure BDA0002091647610000032
Is {1,2, …, N };
step 3, meeting the minimum throughput of the energy collection user
Figure BDA0002091647610000033
Under the condition that the sequence number belongs to when the energy-collecting user transmitter uses the minimum energy
Figure BDA0002091647610000034
The serial number of the ith sub-channel is set to belong to
Figure BDA0002091647610000035
The transmit power allocated on the ith subchannel when the energy-harvesting user transmitter uses the minimum energy is recorded as
Figure BDA0002091647610000036
Figure BDA0002091647610000037
Wherein, i is a positive integer,
Figure BDA0002091647610000038
Figure BDA0002091647610000039
e is the natural logarithm, METo represent
Figure BDA00020916476100000310
The symbol "|" is an absolute value symbol,
Figure BDA00020916476100000311
representing channel coefficients on the ith sub-channel in communication between the energy harvesting user transmitter and the energy harvesting user receiver;
step 4, on the basis of step 3, judging that the serial number belongs to the sequence number when the energy-collecting user transmitter uses the minimum energy
Figure BDA00020916476100000312
Whether the transmission power distributed on each sub-channel is not less than zero, if yes, executing step 5; otherwise, finding out the sub-channel corresponding to the transmitting power less than zero, and then selecting the serial number of the found sub-channel from the serial numbers
Figure BDA00020916476100000313
Deleting, and returning to the step 3 to continue executing;
step 5, the lowest throughput of the users meeting the energy collection
Figure BDA00020916476100000314
Under the condition (2), calculating the minimum energy required by the energy-collecting user, denoted as Emin，
Figure BDA00020916476100000315
Step 6, order
Figure BDA00020916476100000316
A set of sequence numbers representing subchannels allocated to cooperative users for communication in the 1 st sub-slot; then initializing
Figure BDA00020916476100000317
Make it
Figure BDA00020916476100000318
Is {1,2, …, N };
step 7, calculating the transmitting power distributed on each sub-channel in the 1 st sub-time slot for the transmitter of the cooperative user, and recording the transmitting power distributed on the ith sub-channel in the 1 st sub-time slot for the transmitter of the cooperative user as the transmitting power
Figure BDA00020916476100000319
If the serial number of the ith' sub-channel belongs to
Figure BDA00020916476100000320
Then
Figure BDA00020916476100000321
If the serial number of the ith' sub-channel does not belong to
Figure BDA0002091647610000041
Then the
Figure BDA0002091647610000042
Wherein i 'is a positive integer, i' is belonged to {1,2, …, N }, pC,maxRepresenting the maximum allowed transmit power of the cooperative user transmitter,
Figure BDA0002091647610000043
MC1represent
Figure BDA0002091647610000044
The total number of elements contained in (a),
Figure BDA0002091647610000045
representing channel coefficients on the i' th sub-channel in the 1 st sub-slot in communication between the cooperative user transmitter and the cooperative user receiver;
step 8, on the basis of step 7, judging that the cooperative user transmitter belongs to the sequence number in the 1 st sub-time slot
Figure BDA0002091647610000046
Whether the transmission power distributed on each sub-channel is not less than zero, if yes, executing step 9; otherwise, finding out the sub-channel corresponding to the transmitting power less than zero, and then selecting the serial number of the found sub-channel from the serial numbers
Figure BDA0002091647610000047
Deleting, and returning to the step 7 to continue executing;
step 9, calculating energy collected by the energy collecting user transmitter, and recording the energy as Eh，
Figure BDA0002091647610000048
Where ζ represents the energy harvesting efficiency of the energy harvesting user transmitter,
Figure BDA0002091647610000049
representing channel coefficients between the cooperative user transmitter and the energy harvesting user transmitter on the i' th sub-channel;
step 10, judgment EhWhether or not it is not less than EminIf yes, executing step 12; whether or notThen, step 11 is executed;
11, the transmitter belongs to the sequence number in the 1 st sub-slot for the cooperative user
Figure BDA00020916476100000410
Finding out the minimum transmitting power from the transmitting powers distributed on each subchannel; then from
Figure BDA00020916476100000411
Finding out the channel coefficient with the maximum absolute value; then, the minimum transmitting power is redistributed to the sub-channel corresponding to the channel coefficient with the maximum absolute value, so that the transmitting power distributed to the transmitter of the cooperative user on the sub-channel corresponding to the minimum transmitting power in the 1 st sub-time slot is 0, the transmitting power distributed to the transmitter of the cooperative user on the sub-channel corresponding to the channel coefficient with the maximum absolute value in the 1 st sub-time slot is the original distributed transmitting power plus the minimum transmitting power, and when the serial number of the sub-channel corresponding to the channel coefficient with the maximum absolute value does not belong to the sub-channel corresponding to the channel coefficient with the maximum absolute value
Figure BDA00020916476100000412
Then add the serial number to
Figure BDA00020916476100000413
Performing the following steps; then returning to the step 9 to continue the execution; wherein j is a positive integer, j is more than or equal to 1 and less than or equal to N,
Figure BDA00020916476100000414
representing the channel coefficients between the cooperating user transmitter and the energy-harvesting user transmitter on the 1 st subchannel,
Figure BDA00020916476100000415
representing the channel coefficients between the cooperating user transmitter and the energy-harvesting user transmitter on the jth sub-channel,
Figure BDA00020916476100000416
indicating on the Nth sub-channel between the cooperative user transmitter and the energy-harvesting user transmitterA channel coefficient;
step 12, calculating the transmitting power of the energy collection user transmitter, and recording as pEH，
Figure BDA0002091647610000051
Step 13, order
Figure BDA0002091647610000052
Finding out the channel coefficient with the maximum absolute value from omega; then, the serial number of the sub-channel corresponding to the channel coefficient with the maximum absolute value in the omega is recorded as j'; reinitializing
Figure BDA0002091647610000053
Make it
Figure BDA0002091647610000054
Is { j' }; and make omegacw-j'; wherein j is a positive integer, j is more than or equal to 1 and less than or equal to N,
Figure BDA0002091647610000055
representing the channel coefficients on the 1 st subchannel between the energy harvesting user transmitter and the energy harvesting user receiver,
Figure BDA0002091647610000056
representing the channel coefficients between the energy harvesting user transmitter and the energy harvesting user receiver on the jth sub-channel,
Figure BDA0002091647610000057
representing the channel coefficients between the energy harvesting user transmitter and the energy harvesting user receiver on the Nth sub-channel, j' e [1, N]；
Step 14, calculating the number of the energy-collecting user transmitter in the 2 nd sub-slot
Figure BDA0002091647610000058
Set the ith transmission power allocated on each subchannel*The serial numbers of the sub-channels belong to
Figure BDA0002091647610000059
The transmitter will be transmitting in the ith sub-slot for the energy harvesting user in the 2 nd sub-slot*The transmission power allocated on a subchannel is noted as
Figure BDA00020916476100000510
Figure BDA00020916476100000511
Wherein i*Is a positive integer and is a non-zero integer,
Figure BDA00020916476100000512
MEto represent
Figure BDA00020916476100000513
The total number of elements contained in (a),
Figure BDA00020916476100000514
indicating communication between energy harvesting subscriber transmitter and energy harvesting subscriber receiver at ith*Channel coefficients on the subchannels;
step 15, on the basis of step 14, judging that the energy collecting user transmitter belongs to the sequence number in the 2 nd sub-time slot
Figure BDA00020916476100000515
Whether the transmission power allocated to each sub-channel is not less than zero, if yes, executing step 16; otherwise, finding out the sub-channel corresponding to the transmitting power less than zero, and then selecting the serial number of the found sub-channel from the serial numbers
Figure BDA00020916476100000516
Then returning to step 14 to continue execution;
step 16, on the basis of step 15, calculating the actual throughput of the energy collection user, and recording the actual throughput as REHU，
Figure BDA00020916476100000517
Step 17, judging REHUWhether or not it is greater than or equal to
Figure BDA0002091647610000061
If so, go to step 19; otherwise, go to step 18;
step 18, removing omega from omega' to omegacwA set of elements left after all the elements in (1); then finding out the channel coefficient with the maximum absolute value from the omega'; then, the serial numbers of the sub-channels corresponding to the channel coefficient with the maximum absolute value in the omega' are respectively added into the sub-channels
Figure BDA0002091647610000062
And Ωcw(ii) a Then returning to step 14 to continue execution;
step 19, order
Figure BDA0002091647610000063
A set of sequence numbers representing subchannels allocated to cooperative users for communication in the 2 nd sub-slot; then initializing
Figure BDA0002091647610000064
Make it
Figure BDA0002091647610000065
Is to remove all the attributes belonging to {1,2, …, N }
Figure BDA0002091647610000066
The elements left after the element in (1) form a set;
step 20, calculating that the cooperative user transmitter belongs to the sequence number in the 2 nd sub-slot
Figure BDA0002091647610000067
The serial number of the ith sub-channel is set to belong to
Figure BDA0002091647610000068
The transmission power allocated to the cooperative user transmitter on the ith sub-channel in the 2 nd sub-slot is recorded as
Figure BDA0002091647610000069
Figure BDA00020916476100000610
Wherein i' is a positive integer,
Figure BDA00020916476100000611
MC2to represent
Figure BDA00020916476100000612
The total number of elements contained in (a),
Figure BDA00020916476100000613
representing channel coefficients on an ith sub-channel when communicating between the cooperative user transmitter and the cooperative user receiver in the 2 nd sub-slot;
step 21, on the basis of step 20, judging that the cooperative user transmitter belongs to the sequence number in the 2 nd sub-slot
Figure BDA00020916476100000614
If so, completing the transmission power distribution of the transmitter of the cooperative user on the subchannel used by the cooperative user for communication in the 1 st sub-time slot, the transmission power distribution of the transmitter of the cooperative user on the subchannel used by the cooperative user for communication in the 2 nd sub-time slot, the transmission power distribution of the transmitter of the energy collecting user on the subchannel used by the energy collecting user for communication in the 2 nd sub-time slot, and ending; otherwise, finding out the sub-channel corresponding to the transmitting power less than zero, and then selecting the serial number of the found sub-channel from the serial numbers
Figure BDA00020916476100000615
And then returns to step 20 to continue the execution.
Compared with the prior art, the invention has the advantages that:
1) in the 1 st sub-time slot, the cooperative users simultaneously utilize a plurality of sub-channels to carry out effective resource allocation, so that the cooperative users are fully optimized in the 1 st sub-time slot, and therefore, under the same condition, the method can enable the cooperative users to achieve higher throughput.
2) The method of the invention fixes the time length of the two sub-time slots, the time length of the 1 st sub-time slot can select any time length value in the range of [0.3 tau, 0.5 tau ], and the time length of the two sub-time slots does not need to be optimized by utilizing a one-dimensional search algorithm, thereby having lower calculation complexity.
3) In a cooperative wireless network based on a wireless energy collection technology, the method of the invention distributes sub-channels and power to energy collection users and cooperative users in different sub-time slots, so that the throughput of the cooperative users is maximized, and meanwhile, the energy collection users obtain the energy used for communication by themselves through the wireless energy collection technology, thereby solving the problem of limited energy of the energy collection users.
4) In the iterative process of distributing power to the cooperative users and the energy collecting users in the 2 nd sub-time slot, the cooperative users only need to distribute once, and the calculation complexity is effectively reduced.
Drawings
FIG. 1 is a schematic diagram of a cooperative wireless network based on wireless energy harvesting technology;
FIG. 2 is a block flow diagram of the method of the present invention;
fig. 3 is a graph comparing performance curves of throughput of collaborating users as a function of minimum throughput demand of energy harvesting users using the method of the present invention and the method proposed by Ding Xu et al, respectively.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The invention provides a method for allocating power of a cooperative wireless network based on wireless energy collection, wherein a cooperative wireless network based on a wireless energy collection technology is shown in figure 1, a flow chart of the method is shown in figure 2, and the method comprises the following steps:
step 1, in a cooperative wireless network, a cooperative user and an energy collecting user exist, the cooperative user consists of a cooperative user transmitter and a cooperative user receiver, and the energy collecting user consists of an energy collecting user transmitter and an energy collecting user receiver; recording the bandwidth of a total channel of the cooperative wireless network as B, and recording the time length of one time slot of the cooperative wireless network as tau; the total channel is then divided equally into N sub-channels, each having a bandwidth of
Figure BDA0002091647610000081
Let the noise power spectral density of the sum channel and the sub-channels be n0The noise power spectral density of the total channel is the same as the noise power spectral density of each subchannel; dividing the time slot into two sub-time slots, and recording the time length of the 1 st sub-time slot as tau1The time length of the 2 nd sub-slot is denoted as τ2Satisfy τ ═ τ1+τ2(ii) a In the 1 st sub-time slot, the cooperative user transmitter and the cooperative user receiver communicate through a sub-channel, and the energy collecting user transmitter collects energy from the radio frequency signal transmitted by the cooperative user transmitter; in the 2 nd sub-time slot, the cooperative user transmitter and the cooperative user receiver communicate through a sub-channel, meanwhile, the energy collecting user transmitter and the energy collecting user receiver communicate through a sub-channel, and the sub-channel used by the cooperative user for communication is different from the sub-channel used by the energy collecting user for communication; wherein, the unit of B is Hz, the unit of tau is second, N is a positive integer, and N is 2kK is a positive integer greater than or equal to 1, in this example k is 5,
Figure BDA0002091647610000082
in units of Hz, n0In dBm/Hz,. tau1∈[0.3τ,0.5τ]，τ1And τ2In units of seconds; b, τ and n given cooperative wireless network0Are all known.
Step 2, order
Figure BDA0002091647610000083
A set of sequence numbers representing subchannels allocated to energy harvesting users for communication in the 2 nd sub-slot; then initializing
Figure BDA0002091647610000084
Make it
Figure BDA0002091647610000085
Is 1,2, …, N.
Step 3, meeting the minimum throughput of the energy collection user
Figure BDA0002091647610000086
Under the condition that the sequence number belongs to when the energy-collecting user transmitter uses the minimum energy
Figure BDA0002091647610000087
The serial number of the ith sub-channel is set to belong to
Figure BDA0002091647610000088
The transmit power allocated on the ith subchannel when the energy-harvesting user transmitter uses the minimum energy is recorded as
Figure BDA0002091647610000089
Figure BDA00020916476100000810
Wherein, i is a positive integer,
Figure BDA00020916476100000811
Figure BDA00020916476100000812
e is the natural logarithm, METo represent
Figure BDA00020916476100000813
Total of elements contained inThe number, the symbol "|" is the absolute value symbol,
Figure BDA00020916476100000814
representing channel coefficients on the ith sub-channel in communication between the energy harvesting user transmitter and the energy harvesting user receiver; in the case of a given cooperative wireless network,
Figure BDA00020916476100000815
and
Figure BDA00020916476100000816
are all known; if the serial number of the sub-channel does not belong to
Figure BDA0002091647610000091
Then let the lowest throughput for the user that is meeting energy harvesting be met
Figure BDA0002091647610000092
The energy harvesting user transmitter allocates a transmit power of 0 on the subchannel when using the minimum energy.
Step 4, on the basis of step 3, judging that the serial number belongs to the sequence number when the energy-collecting user transmitter uses the minimum energy
Figure BDA0002091647610000093
Whether the allocated transmission power on each sub-channel in (b) is not less than zero at all (if
Figure BDA0002091647610000094
If the serial numbers of the 10 sub-channels are included, judging whether the transmitting power distributed on the 10 sub-channels is not less than zero, if so, executing the step 5; otherwise, find the sub-channel(s) corresponding to the transmission power less than zero (possibly 1 or more), and then find the serial number of the sub-channel from the serial number of the found sub-channel
Figure BDA0002091647610000095
And (5) deleting the data, returning to the step (3) and continuing to execute.
Step 5, meeting the energy harvestingMinimum throughput of aggregated users
Figure BDA0002091647610000096
Under the condition(s), calculating the minimum energy required by the energy harvesting user, denoted as Emin，
Figure BDA0002091647610000097
Step 6, order
Figure BDA0002091647610000098
A set of sequence numbers representing subchannels allocated to cooperative users for communication in the 1 st sub-slot; then initializing
Figure BDA0002091647610000099
Make it possible to
Figure BDA00020916476100000910
Is 1,2, …, N.
Step 7, calculating the transmitting power distributed on each sub-channel in the 1 st sub-time slot for the transmitter of the cooperative user, and recording the transmitting power distributed on the ith sub-channel in the 1 st sub-time slot for the transmitter of the cooperative user as the transmitting power
Figure BDA00020916476100000911
If the serial number of the ith' sub-channel belongs to
Figure BDA00020916476100000912
Then
Figure BDA00020916476100000913
If the serial number of the ith' sub-channel does not belong to
Figure BDA00020916476100000914
Then the
Figure BDA00020916476100000915
Wherein i 'is a positive integer, i' is epsilon {1,2, …, N }, pC,maxRepresenting maximum of co-user transmittersThe large allowed transmission power is the power of the transmission,
Figure BDA00020916476100000916
MC1represent
Figure BDA00020916476100000917
The total number of elements contained in (a),
Figure BDA00020916476100000918
representing channel coefficients on the i' th sub-channel in the 1 st sub-slot in communication between the cooperative user transmitter and the cooperative user receiver; given a cooperative wireless network, pC,maxAnd
Figure BDA00020916476100000919
are all known.
Step 8, on the basis of step 7, judging that the cooperative user transmitter belongs to the sequence number in the 1 st sub-time slot
Figure BDA00020916476100000920
Whether the allocated transmission power on each sub-channel in (b) is not less than zero at all (if
Figure BDA00020916476100000921
If the serial numbers of the 10 sub-channels are included, judging whether the transmission power distributed on the 10 sub-channels by the transmitter of the cooperative user is not less than zero, if so, executing step 9; otherwise, find the sub-channel(s) corresponding to the transmission power less than zero (possibly 1 or more), and then find the serial number of the sub-channel from the serial number of the found sub-channel
Figure BDA0002091647610000101
And (5) deleting, returning to the step (7) and continuing to execute.
Step 9, calculating energy collected by the energy collecting user transmitter, and recording the energy as Eh，
Figure BDA0002091647610000102
Where ζ represents the energy of the energy harvesting subscriber transmitterThe efficiency of the collection of the quantity is improved,
Figure BDA0002091647610000103
representing channel coefficients between the cooperative user transmitter and the energy harvesting user transmitter on the i' th sub-channel; ζ and, given a cooperative wireless network
Figure BDA0002091647610000104
Are all known.
Step 10, judgment EhWhether or not it is not less than EminIf yes, executing step 12; otherwise, step 11 is performed.
11, the transmitter belongs to the sequence number in the 1 st sub-slot for the cooperative user
Figure BDA0002091647610000105
Finding out the minimum transmitting power from the transmitting powers distributed on each subchannel; then from
Figure BDA0002091647610000106
Finding out the channel coefficient with the maximum absolute value; then, the minimum transmitting power is redistributed to the sub-channel corresponding to the channel coefficient with the maximum absolute value, so that the transmitting power distributed to the transmitter of the cooperative user on the sub-channel corresponding to the minimum transmitting power in the 1 st sub-time slot is 0, the transmitting power distributed to the transmitter of the cooperative user on the sub-channel corresponding to the channel coefficient with the maximum absolute value in the 1 st sub-time slot is the original distributed transmitting power plus the minimum transmitting power, and when the serial number of the sub-channel corresponding to the channel coefficient with the maximum absolute value does not belong to the sub-channel corresponding to the channel coefficient with the maximum absolute value
Figure BDA0002091647610000107
Then add the serial number to
Figure BDA0002091647610000108
Performing the following steps; then returning to the step 9 to continue the execution; wherein j is a positive integer, j is more than or equal to 1 and less than or equal to N,
Figure BDA0002091647610000109
representing the channel coefficients between the cooperating user transmitter and the energy-harvesting user transmitter on the 1 st subchannel,
Figure BDA00020916476100001010
representing the channel coefficients between the cooperating user transmitter and the energy-harvesting user transmitter on the jth sub-channel,
Figure BDA00020916476100001011
representing the channel coefficients between the cooperating user transmitters and the energy-harvesting user transmitters on the nth subchannel.
Step 12, calculating the transmitting power of the energy collection user transmitter, and recording as pEH，
Figure BDA00020916476100001012
Step 13, order
Figure BDA00020916476100001013
Finding out the channel coefficient with the maximum absolute value from omega; then, the serial number of the sub-channel corresponding to the channel coefficient with the maximum absolute value in the omega is recorded as j'; reinitializing
Figure BDA00020916476100001014
Make it
Figure BDA00020916476100001015
Is { j' }; and make omegacw-j'; wherein j is a positive integer, j is more than or equal to 1 and less than or equal to N,
Figure BDA00020916476100001016
representing the channel coefficients on the 1 st subchannel between the energy harvesting user transmitter and the energy harvesting user receiver,
Figure BDA00020916476100001017
representing the channel coefficients between the energy harvesting user transmitter and the energy harvesting user receiver on the jth sub-channel,
Figure BDA0002091647610000111
representing the channel coefficients between the energy harvesting user transmitter and the energy harvesting user receiver on the Nth sub-channel, j' e [1, N]。
Step 14, calculating the number of the energy-collecting user transmitter in the 2 nd sub-slot
Figure BDA0002091647610000112
Setting the ith transmission power allocated to each sub-channel in the set*The serial numbers of the sub-channels belong to
Figure BDA0002091647610000113
The transmitter will be transmitting in the ith sub-slot for the energy harvesting user in the 2 nd sub-slot*The transmission power allocated on the sub-channels is noted as
Figure BDA0002091647610000114
Figure BDA0002091647610000115
Wherein i*Is a positive integer which is a multiple of,
Figure BDA0002091647610000116
MEto represent
Figure BDA0002091647610000117
The total number of elements contained in (a),
Figure BDA0002091647610000118
indicating communication between energy harvesting subscriber transmitter and energy harvesting subscriber receiver at ith*Channel coefficients on the subchannels; if the serial number of the sub-channel does not belong to
Figure BDA0002091647610000119
The transmit power allocated by the transmitter for the energy harvesting user on that subchannel in the 2 nd sub-slot is made 0.
Step 15, based on step 14, judgingThe transmitter of the user with energy collection in the 2 nd sub-slot belongs to
Figure BDA00020916476100001110
Whether the allocated transmission power on each sub-channel in (b) is not less than zero at all (if
Figure BDA00020916476100001111
If the number of the sub-channel is 10, judging whether the transmission power distributed on the 10 sub-channels by the energy collection user transmitter is not less than zero, if so, executing step 16; otherwise, find the sub-channel(s) corresponding to the transmission power less than zero (possibly 1 or more), and then find the serial number of the sub-channel from the serial number of the found sub-channel
Figure BDA00020916476100001112
And then returns to step 14 to continue the execution.
Step 16, on the basis of step 15, calculating the actual throughput of the energy collection user, and recording the actual throughput as REHU，
Figure BDA00020916476100001113
Step 17, judging REHUWhether or not it is greater than or equal to
Figure BDA00020916476100001114
If so, go to step 19; otherwise, step 18 is performed.
Step 18, removing omega from omega' to omegacwA set consisting of all elements in (1) and the remaining elements in (b); then finding out the channel coefficient with the maximum absolute value from the omega'; then, the serial numbers of the sub-channels corresponding to the channel coefficient with the maximum absolute value in the omega' are respectively added into the sub-channels
Figure BDA0002091647610000121
And Ωcw(ii) a And returning to the step 14 to continue the execution.
Step 19, order
Figure BDA0002091647610000122
A set of sequence numbers representing subchannels allocated to cooperative users for communication in the 2 nd sub-slot; then initializing
Figure BDA0002091647610000123
Make it
Figure BDA0002091647610000124
Is to remove all the data belonging to {1,2, …, N }
Figure BDA0002091647610000125
The elements in (1) and the elements left behind.
Step 20, calculating that the cooperative user transmitter belongs to the sequence number in the 2 nd sub-slot
Figure BDA0002091647610000126
The serial number of the ith sub-channel is set to belong to
Figure BDA0002091647610000127
The transmission power allocated to the cooperative user transmitter on the ith sub-channel in the 2 nd sub-slot is recorded as
Figure BDA0002091647610000128
Figure BDA0002091647610000129
Wherein, i' is a positive integer,
Figure BDA00020916476100001210
MC2represent
Figure BDA00020916476100001211
The total number of elements contained in (a) is,
Figure BDA00020916476100001212
indicating when communication is between the co-user transmitter and the co-user receiver in the 2 nd sub-sloti' channel coefficients on subchannels; in the case of a given cooperative wireless network,
Figure BDA00020916476100001213
the method comprises the following steps of (1) knowing; if the serial number of the sub-channel does not belong to
Figure BDA00020916476100001214
The transmit power allocated for the cooperative user transmitter on that subchannel in the 2 nd sub-slot is made 0.
Step 21, on the basis of step 20, judging that the cooperative user transmitter belongs to the sequence number in the 2 nd sub-slot
Figure BDA00020916476100001215
Whether the allocated transmission power on each sub-channel in (b) is not less than zero at all (if
Figure BDA00020916476100001216
If the number of the sub-channels is 10, judging whether the transmission power distributed on the 10 sub-channels by the transmitter of the cooperative user is not less than zero at all, if so, completing the transmission power distribution of the transmitter of the cooperative user on the sub-channel used for communication by the cooperative user in the 1 st sub-time slot, the transmission power distribution of the transmitter of the cooperative user on the sub-channel used for communication by the cooperative user in the 2 nd sub-time slot, the transmission power distribution of the transmitter of the energy collection user on the sub-channel used for communication by the energy collection user in the 2 nd sub-time slot, and ending; otherwise, find the sub-channel(s) corresponding to the transmission power less than zero (possibly 1 or more), and then find the serial number of the sub-channel from the serial number of the found sub-channel
Figure BDA00020916476100001217
And then returns to step 20 to continue the execution.
The feasibility and effectiveness of the method of the invention is further illustrated by the following simulations.
FIG. 3 shows the throughput of a collaborating user as the lowest throughput of an energy-harvesting user using the method of the present invention and the method proposed by Ding Xu et al, respectivelyPerformance curves versus volume demand changes. In the simulation, the bandwidth of the total channel is B-180 kHz, and the total channel is equally divided into N-32 subchannels, that is, the bandwidth of each subchannel is B
Figure BDA0002091647610000131
Noise power spectral density of n0-174dBm/Hz, maximum allowed transmit power of the cooperative user transmitter is pC,max23dBm, the energy collection efficiency ζ of the energy collection user transmitter is 0.2, and the time length τ of the 1 st subslot10.4 τ. As can be seen from fig. 3, in both methods the throughput of the cooperative users decreases as the minimum throughput requirement of the energy harvesting users increases, but the performance of the inventive method is significantly better than the method proposed by DingXu et al. Therefore, the method of the invention can well improve the throughput of the cooperative users of the cooperative wireless network based on the energy collection technology.

Claims (1)

1. A cooperative wireless network power distribution method based on wireless energy collection is characterized by comprising the following steps:
step 1, in a cooperative wireless network, a cooperative user and an energy collecting user exist, the cooperative user consists of a cooperative user transmitter and a cooperative user receiver, and the energy collecting user consists of an energy collecting user transmitter and an energy collecting user receiver; recording the bandwidth of a total channel of the cooperative wireless network as B, and recording the time length of one time slot of the cooperative wireless network as tau; the total channel is then divided equally into N sub-channels, each having a bandwidth of
Figure FDA0002091647600000011
Let the noise power spectral density of the sum channel and the sub-channels be n0(ii) a Dividing the time slot into two sub-time slots, and recording the time length of the 1 st sub-time slot as tau1Let the time length of the 2 nd sub-slot be τ2Satisfy τ ═ τ1+τ2(ii) a In the 1 st sub-time slot, between the cooperative user transmitter and the cooperative user receiverCommunicating through the sub-channel, the energy harvesting user transmitter harvesting energy from the radio frequency signals transmitted by the cooperating user transmitters; in the 2 nd sub-time slot, the cooperative user transmitter and the cooperative user receiver communicate through a sub-channel, meanwhile, the energy collecting user transmitter and the energy collecting user receiver communicate through a sub-channel, and the sub-channel used by the cooperative user for communication is different from the sub-channel used by the energy collecting user for communication; wherein, the unit of B is Hz, the unit of tau is second, N is a positive integer, and N is 2kK is a positive integer greater than or equal to 1,
Figure FDA0002091647600000012
in units of Hz, n0In dBm/Hz,. tau1∈[0.3τ,0.5τ]，τ1And τ2In units of seconds;
step 2, order
Figure FDA0002091647600000013
A set of sequence numbers representing subchannels allocated to energy harvesting users for communication in the 2 nd sub-slot; then initializing
Figure FDA0002091647600000014
Make it
Figure FDA0002091647600000015
Is {1,2, …, N };
step 3, meeting the minimum throughput of the energy collection user
Figure FDA0002091647600000016
Under the condition that the sequence number belongs to when the energy-collecting user transmitter uses the minimum energy
Figure FDA0002091647600000017
The serial number of the ith sub-channel is set to belong to
Figure FDA0002091647600000018
The transmit power allocated on the ith subchannel when the energy-harvesting user transmitter uses the minimum energy is recorded as
Figure FDA0002091647600000019
Wherein, i is a positive integer,
Figure FDA00020916476000000110
Figure FDA0002091647600000021
e is the natural logarithm, METo represent
Figure FDA0002091647600000022
The symbol "|" is an absolute value symbol,
Figure FDA0002091647600000023
representing channel coefficients on the ith sub-channel in communication between the energy harvesting user transmitter and the energy harvesting user receiver;
step 4, on the basis of step 3, judging that the serial number belongs to the sequence number when the energy-collecting user transmitter uses the minimum energy
Figure FDA0002091647600000024
Whether the transmission power distributed on each sub-channel is not less than zero, if yes, executing step 5; otherwise, finding out the sub-channel corresponding to the transmitting power less than zero, and then selecting the serial number of the found sub-channel from the serial numbers
Figure FDA0002091647600000025
Deleting, and returning to the step 3 to continue executing;
step 5, the lowest throughput of the users meeting the energy collection
Figure FDA0002091647600000026
Under the condition(s), calculating the minimum energy required by the energy harvesting user, denoted as Emin，
Figure FDA0002091647600000027
Step 6, order
Figure FDA0002091647600000028
A set of sequence numbers representing subchannels allocated to cooperative users for communication in the 1 st sub-slot; then initializing
Figure FDA0002091647600000029
Make it
Figure FDA00020916476000000210
Is {1,2, …, N };
step 7, calculating the transmitting power distributed on each sub-channel in the 1 st sub-time slot for the transmitter of the cooperative user, and recording the transmitting power distributed on the ith sub-channel in the 1 st sub-time slot for the transmitter of the cooperative user as the transmitting power
Figure FDA00020916476000000211
If the serial number of the ith' sub-channel belongs to
Figure FDA00020916476000000212
Then
Figure FDA00020916476000000213
If the serial number of the ith' sub-channel does not belong to
Figure FDA00020916476000000214
Then
Figure FDA00020916476000000215
Wherein i 'is a positive integer, i' is belonged to {1,2, …, N }, pC,maxRepresenting maximum allowable of cooperative user transmittersThe power of the transmission is transmitted,
Figure FDA00020916476000000216
MC1to represent
Figure FDA00020916476000000217
The total number of elements contained in (a),
Figure FDA00020916476000000218
representing channel coefficients on the i' th sub-channel in the 1 st sub-slot in communication between the cooperative user transmitter and the cooperative user receiver;
step 8, on the basis of step 7, judging that the cooperative user transmitter belongs to the sequence number in the 1 st sub-time slot
Figure FDA00020916476000000219
Whether the transmission power distributed on each sub-channel is not less than zero, if yes, executing step 9; otherwise, finding out the sub-channel corresponding to the transmitting power less than zero, and then selecting the serial number of the found sub-channel from the serial numbers
Figure FDA0002091647600000031
Deleting, and returning to the step 7 to continue executing;
step 9, calculating energy collected by the energy collecting user transmitter, and recording the energy as Eh，
Figure FDA0002091647600000032
Where ζ represents the energy harvesting efficiency of the energy harvesting user transmitter,
Figure FDA0002091647600000033
representing channel coefficients between the cooperative user transmitter and the energy harvesting user transmitter on the i' th sub-channel;
step 10, judgment EhWhether or not it is not less than EminIf yes, executing step 12; otherwise, executing step 11;
11, the transmitter belongs to the sequence number in the 1 st sub-slot for the cooperative user
Figure FDA0002091647600000034
Finding out the minimum transmitting power from the transmitting power distributed on each sub-channel in the channel; then is selected from
Figure FDA0002091647600000035
Finding out the channel coefficient with the maximum absolute value; then, the minimum transmitting power is redistributed to the sub-channel corresponding to the channel coefficient with the maximum absolute value, so that the transmitting power distributed to the transmitter of the cooperative user on the sub-channel corresponding to the minimum transmitting power in the 1 st sub-time slot is 0, the transmitting power distributed to the transmitter of the cooperative user on the sub-channel corresponding to the channel coefficient with the maximum absolute value in the 1 st sub-time slot is the original distributed transmitting power plus the minimum transmitting power, and when the serial number of the sub-channel corresponding to the channel coefficient with the maximum absolute value does not belong to the sub-channel corresponding to the channel coefficient with the maximum absolute value
Figure FDA0002091647600000036
Then add the serial number to
Figure FDA0002091647600000037
Performing the following steps; then returning to the step 9 to continue the execution; wherein j is a positive integer, j is more than or equal to 1 and less than or equal to N,
Figure FDA0002091647600000038
representing the channel coefficients between the cooperating user transmitters and the energy-harvesting user transmitters on the 1 st subchannel,
Figure FDA0002091647600000039
representing the channel coefficients between the cooperating user transmitter and the energy-harvesting user transmitter on the jth sub-channel,
Figure FDA00020916476000000310
representing cooperative user transmitters andchannel coefficients on the nth subchannel between the energy harvesting user transmitters;
step 12, calculating the transmitting power of the energy collection user transmitter, and recording as pEH，
Figure FDA00020916476000000311
Step 13, order
Figure FDA00020916476000000312
Finding out the channel coefficient with the maximum absolute value from omega; then, the serial number of the sub-channel corresponding to the channel coefficient with the maximum absolute value in the omega is recorded as j'; reinitializing
Figure FDA00020916476000000313
Make it
Figure FDA00020916476000000314
Is { j' }; and make omegacw-j'; wherein j is a positive integer, j is more than or equal to 1 and less than or equal to N,
Figure FDA00020916476000000315
representing the channel coefficients on the 1 st subchannel between the energy harvesting user transmitter and the energy harvesting user receiver,
Figure FDA00020916476000000316
representing the channel coefficients between the energy harvesting user transmitter and the energy harvesting user receiver on the jth sub-channel,
Figure FDA0002091647600000041
representing the channel coefficients between the energy-harvesting user transmitter and the energy-harvesting user receiver on the Nth subchannel, j' e [1, N]；
Step 14, calculating the number of the energy-collecting user transmitter in the 2 nd sub-slot
Figure FDA0002091647600000042
Setting the ith transmission power allocated to each sub-channel in the set*The serial numbers of the sub-channels belong to
Figure FDA0002091647600000043
The transmitter will be transmitting in the ith sub-slot for the energy harvesting user in the 2 nd sub-slot*The transmission power allocated on the sub-channels is noted as
Figure FDA0002091647600000044
Figure FDA0002091647600000045
Wherein i*Is a positive integer and is a non-zero integer,
Figure FDA0002091647600000046
MEto represent
Figure FDA0002091647600000047
The total number of elements contained in (a),
Figure FDA0002091647600000048
indicating communication between an energy harvesting user transmitter and an energy harvesting user receiver at ith*Channel coefficients on the subchannels;
step 15, on the basis of step 14, judging that the energy collecting user transmitter belongs to the sequence number in the 2 nd sub-time slot
Figure FDA0002091647600000049
Whether the transmission power allocated to each sub-channel is not less than zero, if yes, executing step 16; otherwise, finding out the sub-channel corresponding to the transmitting power less than zero, and then selecting the serial number of the found sub-channel from the serial numbers
Figure FDA00020916476000000410
If yes, returning to step 14 to continue execution;
step 16, on the basis of step 15, calculating the actual throughput of the energy collection user, and recording the actual throughput as REHU，
Figure FDA00020916476000000411
Step 17, judge REHUWhether or not it is greater than or equal to
Figure FDA00020916476000000412
If yes, go to step 19; otherwise, go to step 18;
step 18, removing omega from omega' to omegacwA set of elements left after all the elements in (1); then finding out the channel coefficient with the maximum absolute value from the omega'; then, the serial numbers of the sub-channels corresponding to the channel coefficient with the maximum absolute value in omega' are respectively added into the sub-channels
Figure FDA00020916476000000413
And Ωcw(ii) a Then returning to step 14 to continue execution;
step 19, order
Figure FDA00020916476000000414
A set of sequence numbers representing subchannels allocated to cooperative users for communication in the 2 nd sub-slot; then initializing
Figure FDA0002091647600000051
Make it possible to
Figure FDA0002091647600000052
Is to remove all the attributes belonging to {1,2, …, N }
Figure FDA0002091647600000053
The elements left after the element in (1) form a set;
step 20, calculating that the cooperative user transmitter belongs to the sequence number in the 2 nd sub-slot
Figure FDA0002091647600000054
The serial number of the ith sub-channel is set to belong to
Figure FDA0002091647600000055
The transmit power allocated to the cooperative user transmitter on the ith sub-channel in the 2 nd sub-slot is recorded as
Figure FDA0002091647600000056
Figure FDA0002091647600000057
Wherein i' is a positive integer,
Figure FDA0002091647600000058
MC2to represent
Figure FDA0002091647600000059
The total number of elements contained in (a),
Figure FDA00020916476000000510
representing channel coefficients on the ith "sub-channel in communication between the cooperative user transmitter and the cooperative user receiver in the 2 nd sub-slot;
step 21, on the basis of step 20, judging that the cooperative user transmitter belongs to the sequence number in the 2 nd sub-slot
Figure FDA00020916476000000511
If so, completing the transmission power distribution of the transmitter of the cooperative user on the subchannel used by the cooperative user for communication in the 1 st sub-time slot, the transmitter of the cooperative user on the subchannel used by the cooperative user for communication in the 2 nd sub-time slot, and the energy collecting user on the subchannel used by the energy collecting user for communication in the 2 nd sub-time slotThe transmission power distribution of the transmitter is finished; otherwise, finding out the sub-channel corresponding to the transmitting power less than zero, and then selecting the serial number of the found sub-channel from the serial numbers
Figure FDA00020916476000000512
And then returns to step 20 to continue the execution.
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