CN115333658B - Robust information transmission method of full-duplex nonlinear energy collection relay system - Google Patents
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Abstract
A robust information transmission method of a full duplex nonlinear energy collection relay system comprises the steps of constructing a transmission signal model, constructing a channel error model, determining nonlinear energy collection power, determining the minimum successful transmission rate, determining the maximum link rate, and determining the outage probability and throughput of the system. The invention adopts a multi-antenna full duplex cooperative relay system, establishes a reasonable transmission signal model, and provides a robust information transmission method which can obviously improve the system throughput of the transmission system and realize better interrupt performance and system throughput along with the increase of the relay quantity.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to non-linear energy collection assisted robust information transmission in a multi-antenna full duplex relay system.
Background
In recent years, green communication has become a promising technology for future wireless networks. In green-oriented communication systems, wireless energy transfer techniques based on energy harvesting are an attractive solution to improve the operational sustainability of energy-constrained wireless networks. Early studies of wireless energy relay used slot switching and power splitting techniques to design relay systems, and half-duplex transmission modes were used in these systems. In recent years, an in-band full duplex transmission mode is a new transmission method proposed for the problem of lack of wireless spectrum in a wireless communication system, and compared with a traditional half duplex transmission mode, full duplex transmission can improve spectrum efficiency by nearly one time. Although the full duplex transmission technology can effectively improve the spectrum efficiency, in the relay system, the distance between the transmitting antenna and the receiving antenna of the relay device is too short, so that interference can be generated when the transmitting antenna and the receiving antenna work at the same time and the same frequency, which causes the attenuation of the system performance. Aiming at the technical problem, the self-interference signal caused by the antennas at the two ends of the full duplex relay is regarded as energy, namely, the receiving end can recycle the interference generated by the transmitting end, and the self-energy recycling mechanism generated by the principle is adopted, so that the cruising ability of the system is further enhanced.
For the energy collection circuit, early researches tended to have a linear relationship between the input and the output, i.e. the energy collected by the energy collector always keeps a linear function rising trend when the transmission power of the energy source transmitting end keeps increasing. However, in an actual energy collection circuit, the input-output relationship is difficult to keep the linear relationship all the time, that is, the power collected by the relay energy tends to be saturated when reaching a certain threshold value under the condition that the transmitting power of the transmitting end keeps increasing, and the power does not continue to increase greatly, so that the energy collection circuit is a nonlinear relationship.
Meanwhile, for future wireless communication networks, one of the biggest characteristics is a massive access scene, and in the era of everything interconnection, the wireless communication environment becomes extremely complex, namely, undefined channel state information, so that a channel error model needs to be studied.
In the technical field of full duplex cooperative relay systems for nonlinear energy collection, a technical problem to be solved urgently at present is to provide a reasonable signal transmission method.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a robust information transmission method of a full-duplex nonlinear energy collection relay system, which has the advantages of simple transmission method, easy realization and high system throughput.
The technical scheme adopted for solving the technical problems is composed of the following steps:
(1) Constructing a transmission signal model
The transmission signal model consists of 1 source node S and J full duplex relay nodes R j The method comprises the steps that 1 destination node D is formed by sequentially connecting in series, J epsilon {1,2,. J }, J is a limited positive integer, M antennas are arranged on a source node S, N antennas are arranged on the destination node D, M and N are limited positive integers, and each full-duplex relay node R is formed by sequentially connecting a plurality of destination nodes D in series j And 1 transmitting antenna and 1 receiving antenna are arranged on the antenna to construct a transmission signal model.
(2) Constructing a channel error model
Determining channel coefficients of source node S to full duplex relay node channel according to (1)
wherein ,ε1 Is the first channel error coefficient, ε 1 ∈(0,1)，
The channel coefficient from the source node S to the full duplex relay node estimated before each time slot according to the pilot auxiliary method is [0.6,1 ]]，ω m Error coefficient with the same distribution as channel coefficient is [0.6,1 ]]The method comprises the steps of carrying out a first treatment on the surface of the Determining full duplex relay node R according to (2) j Channel coefficient of channel to destination node->
wherein ,ε2 Is the error coefficient of the second channel epsilon 2 ∈(0,1)，
Is a full duplex relay node R estimated before each time slot according to a pilot auxiliary method j Channel coefficient to destination node,Take the value of [0.6,1 ]]，v l Error coefficient with the same distribution as channel coefficient is [0.6,1 ]]。
(3) Determining nonlinear energy harvesting power
Determining nonlinear energy harvesting power according to (3)
Wherein ρ is the power division ratio of PS protocol, ρ E (0, 1), η is the energy conversion efficiency of the system, η E (0, 1), and h RR | 2 Is the self-interference channel coefficient between relay transmit-receive antennas, |h RR | 2 The value of (5) is [0.6,1 ]]，P th Is the upper threshold for non-linear energy harvesting.
(4) Determining a minimum successful transmission rate
Determining a minimum successful transmission rate according to (4)
wherein ,
is the transmission rate of the source node S to the full duplex relay node channel, is>
Is the transmission rate of the channel from the full duplex relay node to the destination node, R th Is the threshold speed of the system operation, the value is 0.5bit/s/Hz, N 0 Noise power of-25 to-17 dBm +.>
Is the mean value is 0 and the variance is N 0 Additive white gaussian noise of (c).
(5) Determining a maximum link rate
Determining a maximum link rate R according to (5) SRD ：
wherein ,Kth Is the link with the greatest rate.
(6) Determining system outage probability and throughput
Determining the outage probability P of the system according to (6) OP ：
P OP ＝Pr(R SRD ＜R th ) (6)
The system throughput T is determined as per equation (7):
T＝(1-P OP )R th (7)
and the robust information transmission method of the full-duplex nonlinear energy collection relay system is completed.
In the (2) determining channel error model of the present invention, the ε 1 and ε2 Is the error coefficient corresponding to the two-stage channel error, wherein epsilon 1 The optimal value is 0.5 epsilon 2 The optimal value is 0.5.
In the formula (3) in the step (3) of the present invention, ρ is a power division factor of PS protocol, where ρ is optimally 0.5.
In the formula (3) of the step (3) of the present invention, η is the energy conversion efficiency, wherein η is optimally 0.5.
In the formula (4) of the step (4) of the present invention, ρ is a power division factor of PS protocol, where ρ is optimally 0.5.
Because the invention adopts the full duplex cooperative relay system for nonlinear energy collection, a reasonable transmission signal model is established, an information transmission method is provided, limited frequency spectrum resources are adopted, the throughput of the system is improved, and compared with the prior art, the method is characterized in that the method comprises the following steps of j When the number J of the transmission periods is 4 and the signal-to-noise ratio of each transmission period is 5 dB-20 dB, the throughput of the system is higher than that of the existing signal transmission method, 2 times of the existing method is achieved, and the throughput of the system is higher along with the increase of the relay number. The invention has the advantages of simple transmission method, easy realization, high system throughput and the like, and is suitable for the field of wireless cooperative communication.
Drawings
Fig. 1 is a process flow diagram of example 1 of the present invention.
Fig. 2 is a graph of the effect of transmission signal to noise ratio on system throughput T for different full duplex energy harvesting relay numbers.
Fig. 3 is a graph of the impact of transmission signal-to-noise ratio on system throughput when different links are selected.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, but the present invention is not limited to the following embodiments.
Example 1
In fig. 1, the robust information transmission method of the full duplex nonlinear energy collection relay system of the present embodiment is composed of the following steps:
(1) Constructing a transmission signal model
The transmission signal model consists of 1 source node S and J full duplex relay nodes R j The method comprises the steps that 1 destination node D is formed by sequentially connecting in series, J epsilon {1,2,. J }, J is a limited positive integer, M antennas are arranged on a source node S, N antennas are arranged on the destination node D, M and N are limited positive integers, and each full-duplex relay node R is formed by sequentially connecting a plurality of destination nodes D in series j And 1 transmitting antenna and 1 receiving antenna are arranged on the antenna to construct a transmission signal model.
(2) Constructing a channel error model
Determining channel coefficients of source node S to full duplex relay node channel according to (1)
wherein ,ε1 Is the first channel error coefficient, ε 1 Epsilon (0, 1), epsilon of this example 1 The value of the water-based paint is 0.5,
the channel coefficient from the source node S to the full duplex relay node is obtained according to the outdated channel state information and takes the value of [0.6,1 ]]The embodiment of the invention
Take the value of 0.8 omega m Error coefficient with the same distribution as channel coefficient is [0.6,1 ]]Omega of this embodiment m The value is 0.8; determining full duplex relay node R according to (2) j Channel coefficient of channel to destination node->
wherein ,ε2 Is the error coefficient of the second channel epsilon 2 Epsilon (0, 1), epsilon of this example 2 The value of the water-based paint is 0.5,
full duplex relay node R derived from outdated channel state information j Channel coefficient to destination node and value of [0.6,1 ]]∈10 of the present embodiment>
The value is 0.8, v l Error coefficient with the same distribution as channel coefficient is [0.6,1 ]]V of the present embodiment l The value is 0.8.
(3) Determining nonlinear energy harvesting power
Determining nonlinear energy harvesting power according to (3)
Wherein ρ is the power division ratio of PS protocol, ρ is E (0, 1), ρ in this embodiment has a value of 0.5, η is the energy conversion efficiency of the system, η is E (0, 1), η in this embodiment has a value of 0.5, |h RR | 2 Is the self-interference channel coefficient between relay transmit-receive antennas, |h RR | 2 The value of (5) is [0.6,1 ]]|h of the present embodiment RR | 2 The value is 0.8, P th Is the upper threshold for non-linear energy harvesting.
(4) Determining a minimum successful transmission rate
Determining a minimum successful transmission rate according to (4)
wherein ,
is the transmission rate of the source node S to the full duplex relay node channel, is>
Is the transmission rate of the channel from the full duplex relay node to the destination node, R th Is the threshold speed of the system operation, the value is 0.5bit/s/Hz, N 0 Noise power is-25 to-17 dBm, N in the embodiment 0 The value is-20 dBm,/for>
Is the mean value is 0 and the variance is N 0 Additive white gaussian noise of (c).
(5) Determining a maximum link rate
Determining a maximum link rate R according to (5) SRD ：
wherein ,Kth Is the link with the highest rate;
(6) Determining system outage probability and throughput
Determining the outage probability P of the system according to (6) OP ：
P OP ＝Pr(R SRD ＜R th ) (6)
The system throughput T is determined as per equation (7):
T＝(1-P OP )R th (7)
because the embodiment adopts the full duplex cooperative relay system for non-linear energy collection, a reasonable transmission signal model is established, an information transmission method is provided, limited frequency spectrum resources are adopted, and the throughput of the system is improved.
And the robust information transmission method of the full-duplex nonlinear energy collection relay system is completed.
Example 2
The robust information transmission method of the full duplex nonlinear energy collection relay system of the embodiment comprises the following steps:
(1) Constructing a transmission signal model
This step is the same as in example 1.
(2) Constructing a channel error model
Determining channel coefficients of source node S to full duplex relay node channel according to (1)
wherein ,ε1 Is the first channel error coefficient, ε 1 Epsilon (0, 1), epsilon of this example 1 The value of the water-based paint is 0.1,
the channel coefficient from the source node S to the full duplex relay node is obtained according to the outdated channel state information and takes the value of [0.6,1 ]]The embodiment of the invention
Take the value of 0.6 omega m Error coefficient with the same distribution as channel coefficient is [0.6,1 ]]Omega of this embodiment m The value is 0.6; determining full duplex relay node R according to (2) j Channel coefficient of channel to destination node->
wherein ,ε2 Is the error coefficient of the second channel epsilon 2 Epsilon (0, 1), epsilon of this example 2 The value of the water-based paint is 0.1,
full duplex relay node R derived from outdated channel state information j Channel coefficient to destination node and value of [0.6,1 ]]∈10 of the present embodiment>
The value is 0.6, v l Error coefficient with the same distribution as channel coefficient is [0.6,1 ]]V of the present embodiment l The value is 0.6.
(3) Determining nonlinear energy harvesting power
Determining nonlinear energy harvesting power according to (3)
Wherein ρ is the power division ratio of PS protocol, ρ is E (0, 1), ρ in this embodiment takes a value of 0.1, η is the energy conversion efficiency of the system, η is E (0, 1), η in this embodiment takes a value of 0.1, |h RR | 2 Is the self-interference channel coefficient between relay transmit-receive antennas, |h RR | 2 The value of (5) is [0.6,1 ]]|h of the present embodiment RR | 2 The value is 0.6, P th Is the upper threshold for non-linear energy harvesting.
(4) Determining a minimum successful transmission rate
Determining a minimum successful transmission rate according to (4)
wherein ,
is the transmission rate of the source node S to the full duplex relay node channel, is>
Is the transmission rate of the channel from the full duplex relay node to the destination node, R th Is the threshold speed of the system operation, the value is 0.5bit/s/Hz, N 0 Noise power is-25 to-17 dBm, N in the embodiment 0 The value is-25 dBm,/L>
Is the mean value is 0 and the variance is N 0 Additive white gaussian noise of (c).
The other steps were the same as in example 1. A robust information transmission method for a full duplex nonlinear energy collection relay system.
Example 3
The robust information transmission method of the full duplex nonlinear energy collection relay system of the embodiment comprises the following steps:
(1) Constructing a transmission signal model
This step is the same as in example 1.
(2) Constructing a channel error model
Determining channel coefficients of source node S to full duplex relay node channel according to (1)
wherein ,ε1 Is the firstA channel error coefficient, ε 1 Epsilon (0, 1), epsilon of this example 1 The value of the water-based paint is 0.9,
the channel coefficient from the source node S to the full duplex relay node is obtained according to the outdated channel state information and takes the value of [0.6,1 ]]The embodiment of the invention
Take the value 1, omega m Error coefficient with the same distribution as channel coefficient is [0.6,1 ]]Omega of this embodiment m The value is 1; determining full duplex relay node R according to (2) j Channel coefficient of channel to destination node->
wherein ,ε2 Is the error coefficient of the second channel epsilon 2 Epsilon (0, 1), epsilon of this example 2 The value of the water-based paint is 0.9,
full duplex relay node R derived from outdated channel state information j Channel coefficient to destination node and value of [0.6,1 ]]∈10 of the present embodiment>
Take the value of 1, v l Error coefficient with the same distribution as channel coefficient is [0.6,1 ]]V of the present embodiment l The value is 1.
(3) Determining nonlinear energy harvesting power
Determining nonlinear energy harvesting power according to (3)
/>
Wherein ρ is the power division ratio of PS protocol, ρ is 0.9, ρ is 0.1, η is the energy conversion efficiency of the system, η is 0.9, and η is 0.9 RR | 2 Is the self-interference channel coefficient between relay transmit-receive antennas, |h RR | 2 The value of (5) is [0.6,1 ]]|h of the present embodiment RR | 2 Take the value of 1, P th Is the upper threshold for non-linear energy harvesting.
(4) Determining a minimum successful transmission rate
Determining a minimum successful transmission rate according to (4)
wherein ,
is the transmission rate of the source node S to the full duplex relay node channel, is>
Is the transmission rate of the channel from the full duplex relay node to the destination node, R th Is the threshold speed of the system operation, the value is 0.5bit/s/Hz, N 0 Noise power is-25 to-17 dBm, N in the embodiment 0 The value is-17 dBm,/L>
Is the mean value is 0 and the variance is N 0 Additive white gaussian noise of (c).
The other steps were the same as in example 1. And the robust information transmission method of the full-duplex nonlinear energy collection relay system is completed.
In order to verify the beneficial effects of the present invention, the inventors conducted comparative simulation experiments using the robust information transmission method of the full-duplex nonlinear energy collection relay system of embodiment 1 of the present invention (hereinafter referred to as embodiment 1 method) and the existing half-duplex information transmission methods "Outage probabilityand throughput of multirelay SWIPT-WPCN networks with nonlinearEH model and imperfect CSI," IEEE Systems Journal, vol.14, no.1, pp.1206-1217, mar.2020 "(hereinafter referred to as comparative experiment methods), and the experimental results are shown in fig. 2 and 3. Fig. 2 is the effect of transmission signal to noise ratio on system throughput T for different full duplex energy harvesting relay numbers. As can be seen from fig. 2, compared with the comparative experiment method, the method of embodiment 1 improves the throughput of the system by 0-0.25 bits/s/Hz when the number J of the full duplex relay nodes is 4 and the signal to noise ratio of each transmission period is 3 dB-20 dB. Fig. 3 shows the effect of the signal-to-noise ratio of transmission on the throughput of the system when selecting different links, and as can be seen from fig. 3, when selecting an optimal link, the saturated throughput of the system can be achieved when the signal-to-noise ratio is 10dB, and compared with the throughput of the experimental scheme, the throughput is improved by 0.5bits/s/Hz.
Claims (5)
1. A robust information transmission method of a full duplex nonlinear energy collection relay system is characterized by comprising the following steps:
(1) Constructing a transmission signal model
The transmission signal model consists of 1 source node S and J full duplex relay nodes R j The method comprises the steps that 1 destination node D is formed by sequentially connecting in series, J epsilon {1,2,. J }, J is a limited positive integer, M antennas are arranged on a source node S, N antennas are arranged on the destination node D, M and N are limited positive integers, and each full-duplex relay node R is formed by sequentially connecting a plurality of destination nodes D in series j Is provided with1 transmitting antenna and 1 receiving antenna to construct a transmission signal model;
(2) Constructing a channel error model
Determining channel coefficients of source node S to full duplex relay node channel according to (1)
wherein ,ε1 Is the first channel error coefficient, ε 1 ∈(0,1)，
The channel coefficient from the source node S to the full duplex relay node estimated before each time slot according to the pilot auxiliary method is [0.6,1 ]]，ω m Error coefficient with the same distribution as channel coefficient is [0.6,1 ]]The method comprises the steps of carrying out a first treatment on the surface of the Determining full duplex relay node R according to (2) j Channel coefficients of a channel to a destination node
wherein ,ε2 Is the error coefficient of the second channel epsilon 2 ∈(0,1)，
Is a full duplex relay node R estimated before each time slot according to a pilot auxiliary method j Channel coefficient to destination node and value of [0.6,1 ]]，v l Error coefficient with the same distribution as channel coefficient is [0.6,1 ]]；
(3) Determining nonlinear energy harvesting power
Determining nonlinear energy harvesting power according to (3)
Wherein ρ is the power division ratio of PS protocol, ρ E (0, 1), η is the energy conversion efficiency of the system, η E (0, 1), and h RR | 2 Is the self-interference channel coefficient between relay transmit-receive antennas, |h RR | 2 The value of (5) is [0.6,1 ]]，P th Is the upper threshold for non-linear energy harvesting;
(4) Determining a minimum successful transmission rate
Determining a minimum successful transmission rate according to (4)
wherein ,
is the transmission rate of the source node S to the full duplex relay node channel, is>
Is the transmission rate of the channel from the full duplex relay node to the destination node, R th Is the threshold speed of the system operation, the value is 0.5bit/s/Hz, N 0 Noise power of-25 to-17 dBm +.>
Is the mean value is 0 and the variance is N 0 Additive white gaussian noise of (2);
(5) Determining a maximum link rate
Determining a maximum link rate R according to (5) SRD ：
wherein ,Kth Is the link with the highest rate;
(6) Determining system outage probability and throughput
Determining the outage probability P of the system according to (6) OP ：
P OP ＝Pr(R SRD ＜R th ) (6)
The system throughput T is determined as per equation (7):
T＝(1-P OP )R th (7)
and the robust information transmission method of the full-duplex nonlinear energy collection relay system is completed.
2. The robust information transmission method of a full duplex nonlinear energy harvesting relay system according to claim 1, wherein: in (2) determining the channel error model, said ε 1 and ε2 Is the error coefficient corresponding to the two-stage channel error, wherein epsilon 1 The value is 0.5 epsilon 2 The value is 0.5.
3. The robust information transmission method of a full duplex nonlinear energy harvesting relay system according to claim 1, wherein: in the formula (3) in the step (3), ρ is a power division factor of the PS protocol, where ρ takes a value of 0.5.
4. The robust information transmission method of a full duplex nonlinear energy harvesting relay system according to claim 1, wherein: in the formula (3) of the step (3), η is an energy conversion efficiency, wherein η is 0.5.
5. The robust information transmission method of a full duplex nonlinear energy harvesting relay system according to claim 1, wherein: in the formula (4) in the step (4), ρ is a power division factor of the PS protocol, where ρ takes a value of 0.5.
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| CN110391833A (en) * | 2019-06-24 | 2019-10-29 | 东南大学 | Full duplex relaying robust beamforming design method based on self-interference collection of energy |
| CN114024640A (en) * | 2021-09-16 | 2022-02-08 | 西安邮电大学 | Robust relay node selection method in full-duplex energy collection relay system |
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