WO2019210648A1 - Self-adaptive time-slot signal receiving method for swipt system based on nonlinear energy collection - Google Patents

Self-adaptive time-slot signal receiving method for swipt system based on nonlinear energy collection Download PDF

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WO2019210648A1
WO2019210648A1 PCT/CN2018/110447 CN2018110447W WO2019210648A1 WO 2019210648 A1 WO2019210648 A1 WO 2019210648A1 CN 2018110447 W CN2018110447 W CN 2018110447W WO 2019210648 A1 WO2019210648 A1 WO 2019210648A1
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energy
time slot
receiver
signal
receiving
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PCT/CN2018/110447
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冯义志
刘敏刚
宁更新
张军
季飞
傅娟
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华南理工大学
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading

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  • the present invention relates to the field of wireless communication technologies, and in particular, to a wireless information and energy coordinated transmission (SWIPT) system adaptive adaptation time slot signal receiving method based on nonlinear energy collection.
  • SWIPT wireless information and energy coordinated transmission
  • the lifetime of the network often depends on the battery capacity of the network node, so the energy of the node battery is very important, and it is usually necessary to periodically charge the battery or replace the battery.
  • the energy of the node battery is very important, and it is usually necessary to periodically charge the battery or replace the battery.
  • SWIPT is a combination of wireless information transmission and wireless energy transmission.
  • the receiving end is composed of an information receiver and an energy receiver, so that the receiver can decode the same RF signal without adding extra time and frequency resources.
  • ID is obtained from the energy (EH) at the same time.
  • SWIPT can provide stable, controllable and reliable energy harvesting, which has become the focus of research and attention in the industry in recent years.
  • the energy reception at the receiving end and the information decoding utilize the same received signal. How to properly allocate system resources is a key issue affecting system performance.
  • the invention discloses a receiver resource allocation method based on the SWIPT beamforming method of the invention patent No. CN105611633A, published on May 25, 2016, and provides a beamforming design and a SWIPT system resource allocation.
  • a method of reducing the transmission power of a base station but the invention is directed to a linear energy receiver, and the base station transmits a minimum power.
  • the invention patent CN105119644A published on December 2, 2015, "SwIPT-based single-user MIMO system space division switching method" provides two modes of energy reception and information decoding for SWIPT system using MIMO space division switching technology. The method of switching between them, but the invention is also directed to a linear energy receiver, without considering the nonlinearity of the energy receiver.
  • the actual SWIPT energy receiver has a nonlinear characteristic: when the power of the received signal increases to a certain value, the output power of the energy receiver will be saturated and remain unchanged.
  • the resource allocation method of the existing SWIPT system cannot solve the problem of waste of received energy when the output power of the energy receiver is saturated.
  • the purpose of the present invention is to solve the above-mentioned drawbacks in the prior art, and to provide a SWIPT system adaptive time slot signal receiving method based on nonlinear energy harvesting.
  • the method adopts an energy harvesting mode based on time slot switching architecture, optimizes the information receiver and energy receiver switching coefficients by minimizing the outage probability, and aims to provide a practical resource allocation for SWIPT system. method.
  • An adaptive time slot signal receiving method for a SWIPT system based on nonlinear energy harvesting comprising the following steps:
  • the transmitting end S sends a signal x to the energy-limited receiving node D, and the receiving node D divides a resource block into K sub-slots for receiving, and the signal received by the k-th time slot is: Where 1 ⁇ k ⁇ K, h k represents that the channel coefficients of the kth time slot obey flat fading, P k represents the transmitted signal power of the time slot, and n is the additive white Gaussian white noise at the receiving end;
  • the switching coefficient between the information receiver of the receiving node D and the energy receiver is defined as ⁇ (k)
  • the optimal value of the optimal switching coefficient, ⁇ (k) is denoted as ⁇ * (k)
  • the receiving node D performs information reception or energy collection according to the value of ⁇ * (k);
  • the system interruption probability is minimized as the optimization target, the switching coefficient ⁇ (k) is the optimization object, and the objective function is defined. among them Is the instantaneous outage probability of the kth time slot of the system, which is a function of ⁇ (k);
  • the receiver uses the signal for energy harvesting.
  • the optimal information receiver and energy receiver switching coefficient ⁇ * (k) in the step S7 is as follows:
  • the energy conversion efficiency ⁇ of the target node energy receiver takes a value of 1.
  • the receiving method is directed to a wireless communication scenario of a SWIPT system in a point-to-point manner
  • the channel type is a flat fading channel
  • the transmitting node S has a fixed and continuous energy supply
  • the receiving node D has limited energy and no fixed energy supply.
  • the receiver of the receiving node D is composed of two parts: an information receiver and an energy receiver, and the energy receiver obtains energy from the radio frequency signals of the surrounding environment.
  • the present invention is directed to a scenario in which a non-linear energy SWIPT system communicates in a point-to-point communication on a flat fading channel, and solves the problem that the input energy of the nonlinear energy receiver of the SWIPT system is saturated in a certain time slot, resulting in wasted reception energy.
  • the present invention considers that it is more in line with practical needs, solves the problem of rough allocation of resources at the receiving end of the nonlinear energy SWIPT system, and makes the nonlinear energy SWIPT system use signals for information or energy collection and distribution more finely, and improves nonlinear energy.
  • the working efficiency of the SWIPT system receiver is more in line with practical needs, solves the problem of rough allocation of resources at the receiving end of the nonlinear energy SWIPT system, and makes the nonlinear energy SWIPT system use signals for information or energy collection and distribution more finely, and improves nonlinear energy.
  • the present invention is directed to a non-linear energy SWIPT system that proposes adaptively switching collection of information or energy based on channel conditions.
  • the information receiver and energy receiver switching coefficients are optimized.
  • the constructed objective function is simple in form, and some parameters can be adjusted according to different requirements in different scenarios, which improves the flexibility of the application.
  • the solution of the objective function is obtained by the optimization algorithm.
  • the process is simple, there is no complicated mathematical analysis process, it is easy to be practical, and it can optimize two important indicators of the energy acquired by the receiving end and the outage probability of the system.
  • FIG. 1 is a flow chart of adaptive time slot reception of a nonlinear energy harvesting SWIPT system of the present invention
  • Figure 2 is a supplementary flow chart of Figure 1;
  • FIG. 3 is a schematic diagram of information or an energy receiver based on time slot switching of a SWIPT system according to the present invention
  • FIG. 4 is a diagram showing a model of energy harvesting of a nonlinear energy receiver of a SWIPT system according to the present invention
  • FIG. 5 is a schematic diagram of collection of received signal power and nonlinear energy according to the present invention.
  • the embodiment discloses a method for receiving an adaptive time slot signal of a SWIPT system based on nonlinear energy collection.
  • the specific implementation process mainly includes: optimizing an information receiver and an energy receiver switching coefficient, and performing adaptive time slot reception according to the optimization result. signal.
  • the flow of the adaptive time slot receiving core step of the nonlinear energy collecting SWIPT system is shown.
  • the SWIPT system of the present invention shown in FIG. 3 is based on information or energy of time slot switching.
  • the receiver, the present invention relates to a SWIPT system nonlinear energy receiver energy harvesting model, and the present invention shown in FIG. 5 relates to a collection of received signal power and nonlinear energy.
  • Step S1 The transmitting end S sends a signal x to the energy-restricted receiving node D, and the receiving node D divides a resource block into K sub-slots for receiving, and the signal received by the kth (1 ⁇ k ⁇ K) time slots is : Where k k represents the channel coefficient of the kth time slot subject to flat fading, P k represents the transmitted signal power of the time slot, and n is the additive white Gaussian white noise at the receiving end.
  • Step S2 defining a switching coefficient ⁇ between the information receiver of the receiving node D and the energy receiver.
  • the switching coefficient between the information receiver of the receiving node D and the energy receiver is defined as ⁇ (k).
  • the optimal value of the optimal switching coefficient, ⁇ (k) is denoted as ⁇ * (k)
  • the receiving node D performs information reception or energy collection according to the value of ⁇ * (k).
  • Step S4 calculating the input power of the energy receiver of the destination node in the kth time slot according to the power value P rk of the received signal described in step S3.
  • Step S6 minimizing the system outage probability as an optimization target, switching the coefficient ⁇ (k) as an optimization object, and defining an objective function among them Is the instantaneous outage probability of the kth time slot of the system and is a function of ⁇ (k).
  • the probability of interruption is Given.
  • ⁇ 2 0.5 mw is the noise power at the receiving end.
  • Step S7 using the Lagrangian multiplier method, combined with the binary search method, the objective function described in step S6 Solve.
  • Step S8 according to step S4 and step S7, the obtained sub-slot information receiver and the energy receiver switch the value of the coefficient ⁇ * (k) to perform adaptive time slot signal reception.

Abstract

Disclosed is a self-adaptive time-slot signal receiving method for an SWIPT system based on nonlinear energy collection. Firstly, regarding a point-to-point communication scene of a nonlinear energy SWIPT system in a flat fading channel, the problems of received energy waste and rough resource distribution at a receiving end on account that the input signal power of a nonlinear energy receiver in the SWIPT system is saturated in certain time slot are solved; and secondly, regarding the nonlinear energy SWIPT system, the collection of information or energy is self-adaptively switched according to a channel state. Switching coefficients of an information receiver and an energy receiver are optimized, a constructed objective function is simple in form, and some of the parameters can be adjusted according to different requirements in different scenes, thereby improving the flexibility of an application. The solution of the objective function is obtained by means of an optimization algorithm, the process is simple, there is no complicated mathematical parsing process, the practical operation is easy, and two important indicators, i.e. energy acquired by a receiving end and the interruption probability of a system, can be simultaneously optimized.

Description

一种基于非线性能量收集的SWIPT系统自适应时隙信号接收方法Adaptive time slot signal receiving method for SWIPT system based on nonlinear energy harvesting 技术领域Technical field
本发明涉及无线通信技术领域，具体涉及一种基于非线性能量收集的无线信息与能量协同传输(SWIPT)系统自适应适应时隙信号接收方法。The present invention relates to the field of wireless communication technologies, and in particular, to a wireless information and energy coordinated transmission (SWIPT) system adaptive adaptation time slot signal receiving method based on nonlinear energy collection.
背景技术Background technique
在一些传统的能量受限的无线网络中，网络的寿命往往取决于网络节点的电池容量，因此节点电池能量的可持续非常重要，通常需要周期性地对电池进行充电、或者更换电池。对于工作环境恶劣的能量受限网络，其节点的电池充电或更换困难、甚至无法实现，开发无线能量传输/收集技术成为迫切需求。In some traditional energy-constrained wireless networks, the lifetime of the network often depends on the battery capacity of the network node, so the energy of the node battery is very important, and it is usually necessary to periodically charge the battery or replace the battery. For an energy-constrained network with a harsh working environment, it is difficult or even impossible to charge or replace the battery of the node. It is urgent to develop wireless energy transmission/collection technology.
SWIPT是无线信息传输与无线能量传输相结合的技术，接收端由信息接收机和能量接收机组成，使得接收机可以在不增加额外的时间以及频率资源的前提下，对同一射频信号进行信息解码(ID)的同时从中获取能量(EH)。与传统的风能、太阳能、潮汐能等依赖于气候等自然环境因而不可控的能量收集技术相比，SWIPT可提供稳定、可控、可靠的能量收集，近年来成为业界研究和关注的焦点。SWIPT系统中，接收端的能量接收与信息解码利用相同的接收信号，如何合理分配系统资源是影响系统性能的关键问题。SWIPT is a combination of wireless information transmission and wireless energy transmission. The receiving end is composed of an information receiver and an energy receiver, so that the receiver can decode the same RF signal without adding extra time and frequency resources. (ID) is obtained from the energy (EH) at the same time. Compared with traditional energy harvesting technologies such as wind, solar, tidal energy and other natural environments that are uncontrollable due to climate, SWIPT can provide stable, controllable and reliable energy harvesting, which has become the focus of research and attention in the industry in recent years. In the SWIPT system, the energy reception at the receiving end and the information decoding utilize the same received signal. How to properly allocate system resources is a key issue affecting system performance.
目前已有许多研究提出了各种关于SWIPT系统资源分配的方法，但现有的方法主要针对线性能量接收机。公开号为CN105611633A，公开日为2016年5月25日的发明专利“基于SWIPT的波束赋形方法的接收机资源分配方法”，提供了一种将波束赋形设计与SWIPT系统资源分配相结 合以降低基站发送功率的方法，但是该发明针对线性能量接收机、且以基站发送最小功率为目标。公开号为CN105119644A，公开日为2015年12月2日的发明专利“基于SWIPT的单用户MIMO系统空分切换方法”提供了使用MIMO空分切换技术对SWIPT系统在能量接收和信息解码两种模式之间进行切换的方法，但是该发明同样针对的是线性能量接收机，没有考虑能量接收机的非线性。Many studies have proposed various methods for resource allocation of SWIPT systems, but the existing methods are mainly for linear energy receivers. The invention discloses a receiver resource allocation method based on the SWIPT beamforming method of the invention patent No. CN105611633A, published on May 25, 2016, and provides a beamforming design and a SWIPT system resource allocation. A method of reducing the transmission power of a base station, but the invention is directed to a linear energy receiver, and the base station transmits a minimum power. The invention patent CN105119644A, published on December 2, 2015, "SwIPT-based single-user MIMO system space division switching method" provides two modes of energy reception and information decoding for SWIPT system using MIMO space division switching technology. The method of switching between them, but the invention is also directed to a linear energy receiver, without considering the nonlinearity of the energy receiver.
实际的SWIPT能量接收机具有非线性的特点：当接收信号的功率增大到一定的值时，能量接收机的输出功率将达到饱和、保持不变。现有的SWIPT系统的资源分配方法，无法解决能量接收机输出功率饱和时的接收能量浪费问题。The actual SWIPT energy receiver has a nonlinear characteristic: when the power of the received signal increases to a certain value, the output power of the energy receiver will be saturated and remain unchanged. The resource allocation method of the existing SWIPT system cannot solve the problem of waste of received energy when the output power of the energy receiver is saturated.
发明内容Summary of the invention
本发明的目的是为了解决现有技术中的上述缺陷，提供一种基于非线性能量收集的SWIPT系统自适应时隙信号接收方法。该方法采用一种基于时隙切换架构的能量收集模式，以最小化中断概率为优化目标，对信息接收机与能量接收机切换系数进行优化，旨在为SWIPT系统提供一种符合实际的资源分配方法。The purpose of the present invention is to solve the above-mentioned drawbacks in the prior art, and to provide a SWIPT system adaptive time slot signal receiving method based on nonlinear energy harvesting. The method adopts an energy harvesting mode based on time slot switching architecture, optimizes the information receiver and energy receiver switching coefficients by minimizing the outage probability, and aims to provide a practical resource allocation for SWIPT system. method.
本发明的目的可以通过采取如下技术方案达到：The object of the present invention can be achieved by adopting the following technical solutions:
一种基于非线性能量收集的SWIPT系统自适应时隙信号接收方法，所述的接收方法包括下列步骤：An adaptive time slot signal receiving method for a SWIPT system based on nonlinear energy harvesting, the receiving method comprising the following steps:
S1、发送端S向能量受限的接收节点D发送信号x，接收节点D将一个资源块分成K个子时隙进行接收，第k个时隙接收到的信号为：
Figure PCTCN2018110447-appb-000001
式中，1≤k≤K，h k表示第k个时隙的信道系数服从平坦衰落，P k表示该时隙的发送信号功率，n为接收端加性高斯白噪声； S1, the transmitting end S sends a signal x to the energy-limited receiving node D, and the receiving node D divides a resource block into K sub-slots for receiving, and the signal received by the k-th time slot is:
Figure PCTCN2018110447-appb-000001
Where 1 ≤ k ≤ K, h k represents that the channel coefficients of the kth time slot obey flat fading, P k represents the transmitted signal power of the time slot, and n is the additive white Gaussian white noise at the receiving end;
S2、定义接收节点D的信息接收机与能量接收机之间的切换系数ρ， 在第k个时隙，接收节点D的信息接收机与能量接收机之间的切换系数定义为ρ(k)，在第k个时隙，最优切换系数即ρ(k)的最优取值记作ρ *(k)，接收节点D根据ρ *(k)的取值进行信息接收或者能量收集； S2, defining a switching coefficient ρ between the information receiver of the receiving node D and the energy receiver, and in the kth time slot, the switching coefficient between the information receiver of the receiving node D and the energy receiver is defined as ρ(k) In the kth time slot, the optimal value of the optimal switching coefficient, ρ(k), is denoted as ρ * (k), and the receiving node D performs information reception or energy collection according to the value of ρ * (k);
S3、根据所述的接收信号y rk，计算其功率值P rk＝|h k| 2P k，其中|h k| 2是复信道系数h k的模，表示第k个时隙的信道功率增益； S3. Calculate a power value P rk =|h k | 2 P k according to the received signal y rk , where |h k | 2 is a modulus of the complex channel coefficient h k , indicating channel power of the kth time slot Gain
S4、根据接收信号的功率值P rk，计算目的节点的能量接收机在第k个时隙的输入功率
Figure PCTCN2018110447-appb-000002
S4. Calculate an input power of the energy receiver of the destination node in the kth time slot according to the power value P rk of the received signal.
Figure PCTCN2018110447-appb-000002
S5、将能量接收机输入功率
Figure PCTCN2018110447-appb-000003
乘以η后与能量接收机的输出功率饱和值
Figure PCTCN2018110447-appb-000004
进行比较，其中，η是目的节点能量接收机的能量转换效率，若
Figure PCTCN2018110447-appb-000005
则ρ *(k)＝1，接收节点D将信号切换到信息接收机，该时隙只进行信息接收；否则，执行以下顺序步骤； S5, input power to the energy receiver
Figure PCTCN2018110447-appb-000003
Multiplying by η with the output power saturation of the energy receiver
Figure PCTCN2018110447-appb-000004
Comparing, where η is the energy conversion efficiency of the target node energy receiver, if
Figure PCTCN2018110447-appb-000005
Then ρ * (k)=1, the receiving node D switches the signal to the information receiver, and the time slot only performs information reception; otherwise, the following sequential steps are performed;
S6、以系统中断概率最小化为优化目标，切换系数ρ(k)为优化对象，定义目标函数
Figure PCTCN2018110447-appb-000006
其中
Figure PCTCN2018110447-appb-000007
是系统第k个时隙的瞬时中断概率，是ρ(k)的函数； S6, the system interruption probability is minimized as the optimization target, the switching coefficient ρ(k) is the optimization object, and the objective function is defined.
Figure PCTCN2018110447-appb-000006
among them
Figure PCTCN2018110447-appb-000007
Is the instantaneous outage probability of the kth time slot of the system, which is a function of ρ(k);
S7、利用拉格朗日乘子法，并结合二分搜索方法，对所述的目标函数
Figure PCTCN2018110447-appb-000008
进行求解，得到最优的信息接收机与能量接收机切换系数ρ *(k)； S7, using the Lagrangian multiplier method, combined with a binary search method, for the objective function
Figure PCTCN2018110447-appb-000008
Solving, obtaining the optimal information receiver and energy receiver switching coefficient ρ * (k);
S8、根据得到的每个子时隙信息接收机与能量接收机切换系数ρ *(k)的值，进行自适应时隙信号接收。 S8. Perform adaptive time slot signal reception according to the obtained value of each sub-slot information receiver and the energy receiver switching coefficient ρ * (k).
进一步地，所述的切换系数ρ(k)的取值为0或1，其中ρ(k)＝1表示该时隙接收端将信号用于信息接收，ρ(k)＝0表示该时隙接收端将信号用于能量接集。Further, the switching coefficient ρ(k) takes a value of 0 or 1, wherein ρ(k)=1 indicates that the receiving end of the time slot uses a signal for information reception, and ρ(k)=0 indicates the time slot. The receiver uses the signal for energy harvesting.
进一步地，所述的中断概率的公式如下：
Figure PCTCN2018110447-appb-000009
其中r k＝ρ(k)log(1+γ k)是系统第k个时隙的瞬时信息接收速率，r 0是系统正常通 信的最小信息接收速率门限值，此处
Figure PCTCN2018110447-appb-000010
为接收端在第k个时隙的信噪比，σ 2是接收端的噪声功率。 Further, the formula for the probability of interruption is as follows:
Figure PCTCN2018110447-appb-000009
Where r k =ρ(k)log(1+γ k ) is the instantaneous information reception rate of the kth time slot of the system, and r 0 is the minimum information reception rate threshold of the normal communication of the system, where
Figure PCTCN2018110447-appb-000010
For the signal-to-noise ratio of the receiving end in the kth time slot, σ 2 is the noise power at the receiving end.
进一步地，所述的步骤S7中最优的信息接收机与能量接收机切换系数ρ *(k)取值如下： Further, the optimal information receiver and energy receiver switching coefficient ρ * (k) in the step S7 is as follows:
(1)当
Figure PCTCN2018110447-appb-000011
时，则ρ *(k)＝0； (1) When
Figure PCTCN2018110447-appb-000011
When ρ * (k) = 0;
(2)当
Figure PCTCN2018110447-appb-000012
时，则ρ *(k)＝1； (2) When
Figure PCTCN2018110447-appb-000012
When ρ * (k)=1;
(3)当
Figure PCTCN2018110447-appb-000013
时，则ρ *(k)＝0； (3) When
Figure PCTCN2018110447-appb-000013
When ρ * (k) = 0;
其中λ *是最佳拉格朗日乘子。 Where λ * is the best Lagrangian multiplier.
进一步地，所述的目的节点能量接收机的能量转换效率η取值为1。Further, the energy conversion efficiency η of the target node energy receiver takes a value of 1.
进一步地，所述的步骤S8中自适应时隙信信号接收，是指ρ *(k)＝1时，该子时隙只进行信息接收，ρ *(k)＝0时，该子时隙只进行能量收集。 Further, in the step S8, the adaptive time slot signal is received, that is, when ρ * (k)=1, the sub-slot only receives information, and when ρ * (k)=0, the sub-slot Only energy harvesting is performed.
进一步地，所述的接收方法针对的是SWIPT系统在点对点的无线通信场景，信道类型是平坦衰落信道，发送节点S有固定且持续的能量供应，接收节点D能量受限并且没有固定的能量供应，接收节点D的接收机由两部分组成：信息接收机和能量接收机，能量接收机从周围环境的射频信号中获取能量。Further, the receiving method is directed to a wireless communication scenario of a SWIPT system in a point-to-point manner, the channel type is a flat fading channel, the transmitting node S has a fixed and continuous energy supply, the receiving node D has limited energy and no fixed energy supply. The receiver of the receiving node D is composed of two parts: an information receiver and an energy receiver, and the energy receiver obtains energy from the radio frequency signals of the surrounding environment.
本发明相对于现有技术具有如下的优点及效果：The present invention has the following advantages and effects over the prior art:
1、本发明针对非线性能量SWIPT系统在平坦衰落信道点对点通信的场景，解决SWIPT系统非线性能量接收机在某个时隙内输入信号功率饱和导致接收能量浪费的问题。1. The present invention is directed to a scenario in which a non-linear energy SWIPT system communicates in a point-to-point communication on a flat fading channel, and solves the problem that the input energy of the nonlinear energy receiver of the SWIPT system is saturated in a certain time slot, resulting in wasted reception energy.
2、本发明考虑更加符合实际需要，解决非线性能量SWIPT系统接收 端对资源分配粗略的问题，使非线性能量SWIPT系统将信号用于信息或能量收集分配方式更为精细，提高了非线性能量SWIPT系统接收机的工作效率。2. The present invention considers that it is more in line with practical needs, solves the problem of rough allocation of resources at the receiving end of the nonlinear energy SWIPT system, and makes the nonlinear energy SWIPT system use signals for information or energy collection and distribution more finely, and improves nonlinear energy. The working efficiency of the SWIPT system receiver.
3、本发明针对非线性能量SWIPT系统，提出根据信道状态自适应地切换收集信息或者能量。对信息接收机与能量接收机切换系数进行优化，构造的目标函数形式简单，且部分参数能根据不同场景中的不同需求进行调整，提高了应用的灵活性；目标函数的解由优化算法求得，过程简单，没有复杂的数学解析过程，易于实际操作，且能够同时对接收端获取的能量和系统的中断概率两项重要指标进行优化。3. The present invention is directed to a non-linear energy SWIPT system that proposes adaptively switching collection of information or energy based on channel conditions. The information receiver and energy receiver switching coefficients are optimized. The constructed objective function is simple in form, and some parameters can be adjusted according to different requirements in different scenarios, which improves the flexibility of the application. The solution of the objective function is obtained by the optimization algorithm. The process is simple, there is no complicated mathematical analysis process, it is easy to be practical, and it can optimize two important indicators of the energy acquired by the receiving end and the outage probability of the system.
附图说明DRAWINGS
图1是本发明的非线性能量收集SWIPT系统自适应时隙接收流程图；1 is a flow chart of adaptive time slot reception of a nonlinear energy harvesting SWIPT system of the present invention;
图2是图1的补充流程图；Figure 2 is a supplementary flow chart of Figure 1;
图3是本发明涉及的SWIPT系统基于时隙切换的信息或能量接收机示意图；3 is a schematic diagram of information or an energy receiver based on time slot switching of a SWIPT system according to the present invention;
图4是本发明涉及的SWIPT系统非线性能量接收机能量收集模型图；4 is a diagram showing a model of energy harvesting of a nonlinear energy receiver of a SWIPT system according to the present invention;
图5是本发明涉及的接收信号功率与非线性能量关系的收集示意图。FIG. 5 is a schematic diagram of collection of received signal power and nonlinear energy according to the present invention.
具体实施方式detailed description
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
实施例Example
本实施例公开一种基于非线性能量收集的SWIPT系统自适应时隙信号接收方法，具体实施过程主要有：对信息接收机与能量接收机切换系数进行优化，根据优化结果进行自适应时隙接收信号。The embodiment discloses a method for receiving an adaptive time slot signal of a SWIPT system based on nonlinear energy collection. The specific implementation process mainly includes: optimizing an information receiver and an energy receiver switching coefficient, and performing adaptive time slot reception according to the optimization result. signal.
在此实施例中，如图1和图2所示为非线性能量收集SWIPT系统自适应时隙接收核心步骤的流程，图3所示的本发明涉及的SWIPT系统基于时隙切换的信息或能量接收机，图4所示的本发明涉及的SWIPT系统非线性能量接收机能量收集模型，图5所示的本发明涉及的接收信号功率与非线性能量关系的收集示意图。In this embodiment, as shown in FIG. 1 and FIG. 2, the flow of the adaptive time slot receiving core step of the nonlinear energy collecting SWIPT system is shown. The SWIPT system of the present invention shown in FIG. 3 is based on information or energy of time slot switching. The receiver, the present invention relates to a SWIPT system nonlinear energy receiver energy harvesting model, and the present invention shown in FIG. 5 relates to a collection of received signal power and nonlinear energy.
本实施例的实现步骤如下：The implementation steps of this embodiment are as follows:
步骤S1、发送端S向能量受限的接收节点D发送信号x，接收节点D将一个资源块分成K个子时隙进行接收，第k(1≤k≤K)个时隙接收到的信号为：
Figure PCTCN2018110447-appb-000014
式中h k表示第k个时隙的信道系数服从平坦衰落，P k表示该时隙的发送信号功率，n为接收端加性高斯白噪声。 Step S1: The transmitting end S sends a signal x to the energy-restricted receiving node D, and the receiving node D divides a resource block into K sub-slots for receiving, and the signal received by the kth (1 ≤ k ≤ K) time slots is :
Figure PCTCN2018110447-appb-000014
Where k k represents the channel coefficient of the kth time slot subject to flat fading, P k represents the transmitted signal power of the time slot, and n is the additive white Gaussian white noise at the receiving end.
本实施例中，一个资源块的传送时间为60s，将一个资源块分为K＝60个时隙进行接收，第k(1≤k≤60)子时隙发送信号的功率P k＝5mw。 In this embodiment, the transmission time of one resource block is 60 s, and one resource block is divided into K=60 time slots for reception, and the power of the k (1 ≤ k ≤ 60) sub-slot transmission signal P k = 5 mw.
步骤S2、定义接收节点D的信息接收机与能量接收机之间的切换系数ρ。在第k个时隙，接收节点D的信息接收机与能量接收机之间的切换系数定义为ρ(k)。在第k时隙，最优切换系数即ρ(k)的最优取值记作ρ *(k)，接收节点D根据ρ *(k)的取值进行信息接收或者能量收集。切换系数ρ(k)的可能取值只有0和1，其中ρ(k)＝1表示该时隙接收端将信号用于信息接收，ρ(k)＝0表示该时隙接收端将信号用于能量接集。 Step S2, defining a switching coefficient ρ between the information receiver of the receiving node D and the energy receiver. In the kth time slot, the switching coefficient between the information receiver of the receiving node D and the energy receiver is defined as ρ(k). In the kth time slot, the optimal value of the optimal switching coefficient, ρ(k), is denoted as ρ * (k), and the receiving node D performs information reception or energy collection according to the value of ρ * (k). The possible values of the handover coefficient ρ(k) are only 0 and 1, where ρ(k)=1 indicates that the receiver at the time slot uses the signal for information reception, and ρ(k)=0 indicates that the receiver at the time slot uses the signal. For energy collection.
步骤S3、根据步骤S1所述的接收信号y rk，计算其功率值P rk＝|h k| 2P k，其中|h k| 2是步骤S1所述的复信道系数h k的模，表示第k个时隙的信道功率增 益。 Step S3, calculating a power value P rk =|h k | 2 P k according to the received signal y rk according to step S1, where |h k | 2 is a modulus of the complex channel coefficient h k described in step S1, indicating Channel power gain for the kth time slot.
步骤S4、根据步骤S3所述的接收信号的功率值P rk，计算目的节点的能量接收机在第k个时隙的输入功率
Figure PCTCN2018110447-appb-000015
Step S4, calculating the input power of the energy receiver of the destination node in the kth time slot according to the power value P rk of the received signal described in step S3.
Figure PCTCN2018110447-appb-000015
步骤S5、将步骤S4所述的能量接收机输入功率
Figure PCTCN2018110447-appb-000016
乘以η后与能量接收机的输出功率饱和值
Figure PCTCN2018110447-appb-000017
进行比较，若
Figure PCTCN2018110447-appb-000018
则ρ *(k)＝1，接收节点D将信号切换到信息接收机，该时隙只进行信息接收；否则，执行以下顺序步骤。所述的η是目的节点能量接收机的能量转换效率，本发明中η＝1，能量接收机的输出功率饱和值
Figure PCTCN2018110447-appb-000019
Step S5, inputting the energy of the energy receiver described in step S4
Figure PCTCN2018110447-appb-000016
Multiplying by η with the output power saturation of the energy receiver
Figure PCTCN2018110447-appb-000017
Compare, if
Figure PCTCN2018110447-appb-000018
Then ρ * (k) = 1, the receiving node D switches the signal to the information receiver, and the time slot only performs information reception; otherwise, the following sequential steps are performed. The η is the energy conversion efficiency of the target node energy receiver. In the present invention, η=1, the output power saturation value of the energy receiver
Figure PCTCN2018110447-appb-000019
步骤S6、以系统中断概率最小化为优化目标，切换系数ρ(k)为优化对象，定义目标函数
Figure PCTCN2018110447-appb-000020
其中
Figure PCTCN2018110447-appb-000021
是系统第k个时隙的瞬时中断概率，是ρ(k)的函数。实施例中，中断概率由式
Figure PCTCN2018110447-appb-000022
给出。其中r k＝ρ(k)log(1+γ k)是系统第k个时隙的瞬时信息接收速率，r 0＝1.61bits/s/Hz是系统正常通信的最小信息接收速率门限值，此处
Figure PCTCN2018110447-appb-000023
为接收端在第k个时隙的信噪比，σ 2＝0.5mw是接收端的噪声功率。 Step S6, minimizing the system outage probability as an optimization target, switching the coefficient ρ(k) as an optimization object, and defining an objective function
Figure PCTCN2018110447-appb-000020
among them
Figure PCTCN2018110447-appb-000021
Is the instantaneous outage probability of the kth time slot of the system and is a function of ρ(k). In the embodiment, the probability of interruption is
Figure PCTCN2018110447-appb-000022
Given. Where r k =ρ(k)log(1+γ k ) is the instantaneous information reception rate of the kth time slot of the system, and r 0 =1.61 bits/s/Hz is the minimum information reception rate threshold of the normal communication of the system. Here
Figure PCTCN2018110447-appb-000023
For the signal-to-noise ratio of the receiving end in the kth time slot, σ 2 = 0.5 mw is the noise power at the receiving end.
步骤S7、利用拉格朗日乘子法，并结合二分搜索方法，对步骤S6所述的目标函数
Figure PCTCN2018110447-appb-000024
进行求解。所求得的最优拉格朗日乘子的值为λ *＝0.32；最优的信息接收机与能量接收机切换系数ρ *(k)(1≤k≤K)的值如下： Step S7, using the Lagrangian multiplier method, combined with the binary search method, the objective function described in step S6
Figure PCTCN2018110447-appb-000024
Solve. The value of the optimal Lagrangian multiplier obtained is λ * = 0.32; the optimal information receiver and energy receiver switching coefficient ρ * (k) (1 ≤ k ≤ K) are as follows:
(1)当
Figure PCTCN2018110447-appb-000025
时，则ρ *(k)＝0； (1) When
Figure PCTCN2018110447-appb-000025
When ρ * (k) = 0;
(2)当
Figure PCTCN2018110447-appb-000026
时，则ρ *(k)＝1； (2) When
Figure PCTCN2018110447-appb-000026
When ρ * (k)=1;
(3)当
Figure PCTCN2018110447-appb-000027
时，则ρ *(k)＝0。 (3) When
Figure PCTCN2018110447-appb-000027
Then, ρ * (k) = 0.
步骤S8、根据步骤S4和步骤S7所述，得到的每个子时隙信息接收机与 能量接收机切换系数ρ *(k)的值，进行自适应时隙信号接收。 Step S8, according to step S4 and step S7, the obtained sub-slot information receiver and the energy receiver switch the value of the coefficient ρ * (k) to perform adaptive time slot signal reception.
上述实施例为本发明较佳的实施方式，但本发明的实施方式并不受上述实施例的限制，其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化，均应为等效的置换方式，都包含在本发明的保护范围之内。The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and combinations thereof may be made without departing from the spirit and scope of the invention. Simplifications should all be equivalent replacements and are included in the scope of the present invention.

Claims (7)

  1. 一种基于非线性能量收集的SWIPT系统自适应时隙信号接收方法，其特征在于，所述的接收方法包括下列步骤：A method for receiving adaptive time slot signals of a SWIPT system based on nonlinear energy harvesting, characterized in that the receiving method comprises the following steps:
    S1、发送端S向能量受限的接收节点D发送信号x，接收节点D将一个资源块分成K个子时隙进行接收，第k个时隙接收到的信号为：
    Figure PCTCN2018110447-appb-100001
    式中，1≤k≤K，h k表示第k个时隙的信道系数服从平坦衰落，P k表示该时隙的发送信号功率，n为接收端加性高斯白噪声；     S1, the transmitting end S sends a signal x to the energy-limited receiving node D, and the receiving node D divides a resource block into K sub-slots for receiving, and the signal received by the k-th time slot is:
    Figure PCTCN2018110447-appb-100001
    Where 1 ≤ k ≤ K, h k represents that the channel coefficients of the kth time slot obey flat fading, P k represents the transmitted signal power of the time slot, and n is the additive white Gaussian white noise at the receiving end;
    S2、定义接收节点D的信息接收机与能量接收机之间的切换系数ρ，在第k个时隙，接收节点D的信息接收机与能量接收机之间的切换系数定义为ρ(k)，在第k个时隙，最优切换系数即ρ(k)的最优取值记作ρ *(k)，接收节点D根据ρ *(k)的取值进行信息接收或者能量收集； S2, defining a switching coefficient ρ between the information receiver of the receiving node D and the energy receiver, and in the kth time slot, the switching coefficient between the information receiver of the receiving node D and the energy receiver is defined as ρ(k) In the kth time slot, the optimal value of the optimal switching coefficient, ρ(k), is denoted as ρ * (k), and the receiving node D performs information reception or energy collection according to the value of ρ * (k);
    S3、根据所述的接收信号y rk，计算其功率值P rk＝|h k| 2P k，其中|h k| 2是复信道系数h k的模，表示第k个时隙的信道功率增益； S3. Calculate a power value P rk =|h k | 2 P k according to the received signal y rk , where |h k | 2 is a modulus of the complex channel coefficient h k , indicating channel power of the kth time slot Gain
    S4、根据接收信号的功率值P rk，计算目的节点的能量接收机在第k个时隙的输入功率
    Figure PCTCN2018110447-appb-100002
    S4. Calculate an input power of the energy receiver of the destination node in the kth time slot according to the power value P rk of the received signal.
    Figure PCTCN2018110447-appb-100002
    S5、将能量接收机输入功率
    Figure PCTCN2018110447-appb-100003
    乘以η后与能量接收机的输出功率饱和值
    Figure PCTCN2018110447-appb-100004
    进行比较，其中，η是目的节点能量接收机的能量转换效率，若
    Figure PCTCN2018110447-appb-100005
    则ρ *(k)＝1，接收节点D将信号切换到信息接收机，该时隙只进行信息接收；否则，执行以下顺序步骤；     S5, input power to the energy receiver
    Figure PCTCN2018110447-appb-100003
    Multiplying by η with the output power saturation of the energy receiver
    Figure PCTCN2018110447-appb-100004
    Comparing, where η is the energy conversion efficiency of the target node energy receiver, if
    Figure PCTCN2018110447-appb-100005
    Then ρ * (k)=1, the receiving node D switches the signal to the information receiver, and the time slot only performs information reception; otherwise, the following sequential steps are performed;
    S6、以系统中断概率最小化为优化目标，切换系数ρ(k)为优化对象，定义目标函数
    Figure PCTCN2018110447-appb-100006
    其中
    Figure PCTCN2018110447-appb-100007
    是系统第k个时隙的瞬时中断概率，是ρ(k)的函数；     S6, the system interruption probability is minimized as the optimization target, the switching coefficient ρ(k) is the optimization object, and the objective function is defined.
    Figure PCTCN2018110447-appb-100006
    among them
    Figure PCTCN2018110447-appb-100007
    Is the instantaneous outage probability of the kth time slot of the system, which is a function of ρ(k);
    S7、利用拉格朗日乘子法，并结合二分搜索方法，对所述的目标函数
    Figure PCTCN2018110447-appb-100008
    进行求解，得到最优的信息接收机与能量接收机切换系数ρ *(k)；     S7, using the Lagrangian multiplier method, combined with a binary search method, for the objective function
    Figure PCTCN2018110447-appb-100008
    Solving, obtaining the optimal information receiver and energy receiver switching coefficient ρ * (k);
    S8、根据得到的每个子时隙信息接收机与能量接收机切换系数ρ *(k)的值，进行自适应时隙信号接收。 S8. Perform adaptive time slot signal reception according to the obtained value of each sub-slot information receiver and the energy receiver switching coefficient ρ * (k).
  2. 根据权利要求1所述的一种基于非线性能量收集的SWIPT系统自适应时隙信号接收方法，其特征在于，所述的切换系数ρ(k)的取值为0或1，其中ρ(k)＝1表示该时隙接收端将信号用于信息接收，ρ(k)＝0表示该时隙接收端将信号用于能量接集。The adaptive time slot signal receiving method for a SWIPT system based on nonlinear energy harvesting according to claim 1, wherein the switching coefficient ρ(k) has a value of 0 or 1, wherein ρ(k) ) = 1 indicates that the receiver at the time slot uses the signal for information reception, and ρ(k) = 0 indicates that the receiver at the time slot uses the signal for energy reception.
  3. 根据权利要求1所述的一种基于非线性能量收集的SWIPT系统自适应时隙信号接收方法，其特征在于，所述的中断概率的公式如下：
    Figure PCTCN2018110447-appb-100009
    其中r k＝ρ(k)log(1+γ k)是系统第k个时隙的瞬时信息接收速率，r 0是系统正常通信的最小信息接收速率门限值，此处
    Figure PCTCN2018110447-appb-100010
    为接收端在第k个时隙的信噪比，σ 2是接收端的噪声功率。     The adaptive time slot signal receiving method for a SWIPT system based on nonlinear energy harvesting according to claim 1, wherein the formula of the outage probability is as follows:
    Figure PCTCN2018110447-appb-100009
    Where r k =ρ(k)log(1+γ k ) is the instantaneous information reception rate of the kth time slot of the system, and r 0 is the minimum information reception rate threshold of the normal communication of the system, where
    Figure PCTCN2018110447-appb-100010
    For the signal-to-noise ratio of the receiving end in the kth time slot, σ 2 is the noise power at the receiving end.
  4. 根据权利要求1所述的一种基于非线性能量收集的SWIPT系统自适应时隙信号接收方法，其特征在于，所述的步骤S7中最优的信息接收机与能量接收机切换系数ρ *(k)取值如下： The adaptive time slot signal receiving method for a SWIPT system based on nonlinear energy harvesting according to claim 1, wherein the optimal information receiver and the energy receiver switching coefficient ρ * in the step S7 ( k) The values are as follows:
    (1)当
    Figure PCTCN2018110447-appb-100011
    时，则ρ *(k)＝0；     (1) When
    Figure PCTCN2018110447-appb-100011
    When ρ * (k) = 0;
    (2)当
    Figure PCTCN2018110447-appb-100012
    时，则ρ *(k)＝1；     (2) When
    Figure PCTCN2018110447-appb-100012
    When ρ * (k)=1;
    (3)当
    Figure PCTCN2018110447-appb-100013
    时，则ρ *(k)＝0；     (3) When
    Figure PCTCN2018110447-appb-100013
    When ρ * (k) = 0;
    其中λ *是最佳拉格朗日乘子。 Where λ * is the best Lagrangian multiplier.
  5. 根据权利要求1所述的一种基于非线性能量收集的SWIPT系统自适 应时隙信号接收方法，其特征在于，所述的目的节点能量接收机的能量转换效率η取值为1。The method for receiving an adaptive time slot signal of a SWIPT system based on nonlinear energy harvesting according to claim 1, wherein the energy conversion efficiency η of the target node energy receiver takes a value of 1.
  6. 根据权利要求1所述的一种基于非线性能量收集的SWIPT系统自适应时隙信号接收方法，其特征在于，所述的步骤S8中自适应时隙信信号接收，是指ρ *(k)＝1时，该子时隙只进行信息接收，ρ *(k)＝0时，该子时隙只进行能量收集。 The adaptive time slot signal receiving method for a SWIPT system based on nonlinear energy harvesting according to claim 1, wherein the adaptive time slot signal receiving in the step S8 is ρ * (k) When =1, the sub-time slot only receives information, and when ρ * (k) = 0, the sub-time slot only performs energy collection.
  7. 根据权利要求1至5任一所述的一种基于非线性能量收集的SWIPT系统自适应时隙信号接收方法，其特征在于，所述的接收方法针对的是SWIPT系统在点对点的无线通信场景，信道类型是平坦衰落信道，发送节点S有固定且持续的能量供应，接收节点D能量受限并且没有固定的能量供应，接收节点D的接收机由两部分组成：信息接收机和能量接收机，能量接收机从周围环境的射频信号中获取能量。The method for receiving an adaptive time slot signal of a SWIPT system based on nonlinear energy harvesting according to any one of claims 1 to 5, wherein the receiving method is directed to a wireless communication scenario of a SWIPT system in a point-to-point manner, The channel type is a flat fading channel, the transmitting node S has a fixed and continuous energy supply, the receiving node D has limited energy and there is no fixed energy supply, and the receiver of the receiving node D is composed of two parts: an information receiver and an energy receiver. The energy receiver extracts energy from the ambient RF signal.
PCT/CN2018/110447 2018-05-04 2018-10-16 Self-adaptive time-slot signal receiving method for swipt system based on nonlinear energy collection WO2019210648A1 (en)

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