CN106792918B - Multi-user cooperative communication method and system based on wireless energy transmission - Google Patents
Multi-user cooperative communication method and system based on wireless energy transmission Download PDFInfo
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- CN106792918B CN106792918B CN201611138460.6A CN201611138460A CN106792918B CN 106792918 B CN106792918 B CN 106792918B CN 201611138460 A CN201611138460 A CN 201611138460A CN 106792918 B CN106792918 B CN 106792918B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15592—Adapting at the relay station communication parameters for supporting cooperative relaying, i.e. transmission of the same data via direct - and relayed path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
Abstract
The invention discloses a multi-user cooperative communication method and a system based on wireless energy transmission, wherein the multi-user cooperative communication method comprises the following steps: the relay sends energy signals to all source nodes; after the source node collects wireless energy, the source node sequentially sends information to corresponding destination nodes with the assistance of the relay; the multi-user cooperative communication system includes: the wireless information communication system comprises a relay, a plurality of source nodes and a plurality of destination nodes, wherein the relay is used for wireless energy transmission and wireless information communication forwarding, the source nodes are used for collecting wireless energy and sending wireless information by using the collected wireless energy, and the destination nodes are used for wireless information communication with the source nodes. The invention effectively enlarges the coverage rate and the operation time of the communication system, wirelessly supplies power to the source nodes without embedded energy supply through the relay and forwards the information of the source nodes, and is used as a new wireless energy transmission communication method.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a multi-user cooperative communication system based on wireless energy transmission and a resource allocation method.
Background
With the rapid development of wireless communication technology, the coverage and operation time of wireless communication networks are increasingly required. In order to improve the coverage rate of a communication network, cooperative communication based on relays is a common technical solution. The relay can solve the problem that no direct path exists between two communication parties due to geographical limitations and the like, so that the coverage rate of the communication network is effectively improved. In the wireless communication process, the electromagnetic wave signal at the radio frequency end not only carries information, but also simultaneously carries energy, so that the wireless equipment can supplement energy from the radio frequency signal. The wireless energy transmission can make the wireless device obtain stable and controllable green energy, but research and application in the field of wireless communication are just beginning.
In a communication system based on wireless energy transmission, in order to prolong the service life of an energy-limited relay node, most of the current schemes assume that a communication source node has a constant energy supply and a relay supplements energy from the source node through wireless energy transmission, so as to overcome the problem of limited relay service life, as shown in fig. 1. However, in practical wireless communication systems, the source node is also energy-limited (especially in wireless sensor networks), and from this point of view, the existing communication schemes have obvious irrationality.
In addition, due to channel attenuation, energy obtained by wireless energy transmission is often severely attenuated, and if wireless information communication is performed by using collected energy, the wireless information communication is often limited by a low rate and a short distance.
Therefore, how to fully consider the practical situation, fully utilize the transferability of wireless energy, and maximize the system communication capacity by adopting reasonable resource allocation is the problem to be solved by the patent.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention provides a multi-user cooperative communication method and system based on wireless energy transmission, which effectively enlarge the coverage rate and the operation time of a communication system, and are used as a new wireless energy transmission communication method by wirelessly supplying power to a source node without embedded energy supply through a relay and forwarding the information of the source node.
In order to solve the technical problems, the invention provides the following technical scheme: a multi-user cooperative communication method based on wireless energy transmission comprises the following steps:
s1, broadcasting energy signals to all source nodes in a relay mode;
and S2, the source node collects energy from the received electromagnetic wave signals and then sequentially communicates with the destination node with the assistance of the relay.
Further, in step S1, specifically, the method includes:
s11, fixedly setting the time for the relay to transmit wireless energy;
and S12, broadcasting the energy signal to all source nodes within a fixed time by the relay, and simultaneously supplementing energy by all the source nodes by using the received energy signal for information transmission of the next stage.
Further, in step S12, the relay broadcasts the energy signal to all source nodes at peak power.
Further, in step S2, specifically, the method includes:
s21, when the wireless energy transmission is finished, the relay is switched to a wireless information forwarding mode;
and S22, the source node sequentially carries out wireless information communication with the corresponding destination node under the assistance of the relay by using the collected wireless energy.
Further, the relay switches between wireless energy transmission and wireless information forwarding in a time division mode.
Further, the relay calculates the time for wireless information communication between each pair of the source node and the destination node and corresponding relay forwarding power through a Lagrange duality method.
Another object of the present invention is to provide a multi-user cooperative communication system based on wireless energy transmission, which includes a relay, a plurality of source nodes and a plurality of corresponding destination nodes, wherein the relay is used for wireless energy transmission and wireless information communication forwarding, the source nodes are used for collected wireless energy and transmitting wireless information by using the collected wireless energy, and the destination nodes are used for wireless information communication with the source nodes.
Further, the relay, the source node and the destination node all comprise a single antenna.
After the technical scheme is adopted, the invention at least has the following beneficial effects:
1. aiming at the problem that the limitation of energy supply of a source node is ignored in the existing scheme, the invention designs a novel hybrid relay method integrating energy transmission and information forwarding, so that the source node without embedded energy supply can acquire energy from a relay through wireless energy transmission to prolong the service cycle of a wireless cooperative communication system, and the problems of low communication rate and short communication distance of the source node without embedded energy supply can be solved through relaying and forwarding information, so that the hybrid relay method has wide practical application prospect;
2. aiming at the newly proposed system method, the invention provides an optimal resource allocation scheme of multi-user cooperative communication based on time division, so that the total rate of the system is maximized.
Drawings
Fig. 1 is a block diagram of a conventional relay-assisted wireless energy-carrying communication method;
FIG. 2 is a block diagram of a multi-user cooperative communication system based on wireless energy transmission according to the present invention;
FIG. 3 is a diagram of time distribution of wireless energy transmission and wireless information transmission based on time division for a multi-user cooperative communication method based on wireless energy transmission according to the present invention;
fig. 4 is a flowchart illustrating steps of a multi-user cooperative communication method based on wireless energy transmission according to the present invention.
Detailed Description
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict, and the present application is further described in detail with reference to the drawings and specific embodiments.
As shown in fig. 2, the novel multi-user cooperative communication system based on wireless energy transmission provided by the present invention includes a relay, a plurality of communication source nodes, and a plurality of corresponding communication destination nodes. All nodes are equipped with a single antenna. The present invention employs time division techniques at the relay.
As shown in fig. 3, all nodes are equipped with a single antenna. For the above system with K (K > ═ 2) pairs of "source-destination" nodes, the workflow can be divided into K +1 time periods, starting with the 0 th time period and ending with the kth time period. "Source-destination" nodes represent the relationship between each pair of source and destination nodes.
As shown in fig. 4, the present invention provides a multi-user cooperative communication method based on wireless energy transmission, which includes the steps of:
step S101: in the 0 th time period, in the energy preparation process, then, the relay broadcasts energy signals to all source nodes with peak power, and at the same time, all the source nodes collect energy from the received radio frequency signals so as to supplement the energy; the method is characterized in that the energy is broadcasted with peak power in a relay mode, so that under the condition of certain transmitted energy, the used time is as small as possible, and correspondingly, more time can be used for transmitting information, and the total speed of the system is improved.
Step S102: after all the source nodes collect energy, the information is sequentially sent to the corresponding destination nodes with the assistance of the relay. According to the Lagrange dual method, the method is distributed to each pair of 'source-destination' communication nodes for corresponding time periods with different lengths, and the transmitting power of a relay for forwarding corresponding information in each time period is obtained; the time for wireless energy transmission is linearly searched to find the optimal time allocation to maximize the total rate of the system.
The invention adopts a wireless energy transmission scheme, all source nodes need to collect energy signals transmitted by the relay due to limited energy or no embedded energy supply, and information is transmitted by using the collected energy. The method comprises the steps that firstly, a period of transmission time is allocated for broadcasting energy signals to all source nodes in a relay mode, and meanwhile, all the source nodes carry out energy collection in the period of time; and distributing the residual transmission time to each source node to transmit information to each destination node. Each pair of "source-destination" node pairs communicates with the assistance of a relay. In the scheme provided by the invention, the relay node can wirelessly charge the source node and can forward the information of the source node and the source node, and the relay node has good practical engineering application prospect on wireless network nodes with limited energy and limited geographic positions.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various equivalent changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims (6)
1. A multi-user cooperative communication method based on wireless energy transmission is characterized by comprising the following steps:
s1, broadcasting energy signals to all source nodes in a relay mode; the source node has no embedded energy supply;
s2, the source node collects wireless energy from the received energy signal and then sequentially communicates with corresponding destination nodes with the assistance of the relay;
the step S1 specifically includes:
s11, fixedly setting the time for the relay to transmit wireless energy;
s12, broadcasting energy signals to all source nodes within a fixed time by the relay, and simultaneously supplementing energy from the received energy signals by all the source nodes for information transmission of the next stage;
the step S2 specifically includes:
s21, when the wireless energy transmission is finished, the relay is switched to a wireless information forwarding mode;
and S22, the source node sequentially carries out wireless information communication with the corresponding destination node under the assistance of the relay by using the collected wireless energy.
2. The method for multi-user cooperative communication based on wireless energy transmission according to claim 1, wherein in step S12, the relay broadcasts energy to all source nodes at peak power.
3. The method according to claim 1, wherein the relay switches between wireless energy transmission and wireless information forwarding in a time division mode.
4. The multi-user cooperative communication method based on wireless energy transmission as claimed in claim 1, wherein the relay calculates the time for wireless information communication between each pair of source node and destination node and the corresponding relay forwarding power by lagrangian dual method.
5. A multi-user cooperative communication system for implementing the multi-user cooperative communication method based on wireless energy transmission according to any one of claims 1 to 4, comprising a relay, a plurality of source nodes and a plurality of corresponding destination nodes, wherein the relay is used for wireless energy transmission and wireless information communication forwarding, the source nodes are used for collecting wireless energy and transmitting wireless information by using the collected wireless energy, and the destination nodes are used for wireless information communication with the source nodes.
6. The system according to claim 5, wherein the relay, the source node, and the destination node each comprise a single antenna.
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