WO2020000733A1 - 三中继节点协作通信功率分配方法 - Google Patents
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- WO2020000733A1 WO2020000733A1 PCT/CN2018/108094 CN2018108094W WO2020000733A1 WO 2020000733 A1 WO2020000733 A1 WO 2020000733A1 CN 2018108094 W CN2018108094 W CN 2018108094W WO 2020000733 A1 WO2020000733 A1 WO 2020000733A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0426—Power distribution
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- the present application relates to the field of wireless communication technologies, and more particularly, to a method for cooperative communication power allocation of three relay nodes.
- Cooperative communication is a spatial diversity technology that can form a virtual MIMO (Multiple Input and Multiple Output) through mutual cooperation between users during communication. It overcomes the obstacles of wireless networks that cannot use multi-antenna transmit and receive technology when transmitting and receiving due to the limitation of device size and power consumption, and can achieve the performance of MIMO space diversity technology.
- MIMO Multiple Input and Multiple Output
- the cooperative communication protocols can be divided into AF (Amplify and Forward) protocols and DF (Decode and Forward) protocols.
- the AF protocol simply amplifies the received signal by the relay and then forwards it to the destination node.
- the inventor realized that this method has low system overhead and complexity, but also amplifies noise and reduces system performance.
- the cooperative communication MIMO system using the AF protocol includes three relay nodes, the current power solution also has a problem that the capacity of the cooperative link is not large enough.
- the purpose of this application is to overcome the shortcomings of the prior art and provide a method for three-relay node cooperative communication power allocation with an ideal cooperative link capacity.
- the present application provides a three-relay node cooperative communication power allocation method.
- the power allocation method is used in a communication system, and the communication system includes a first node, a second node, a third node, and a fourth node.
- the first node is configured to transmit a first signal to the second node, the third node, the fourth node, and the fifth node with power P 0, and the second node A node for amplifying the received first signal and sending it to the fifth node with power P 1 , and the third node for amplifying the received first signal and sending it to the fifth with power P 2
- the fourth node is configured to amplify the received first signal and send it to the fifth node with power P 3
- the fifth node is configured to send the first signal from the first node and the second node
- the first signals of the third node and the fourth node are combined, wherein the method includes: determining the power P 0 ; according to a preset power P, the determined power P 0, and a preset power allocation rule, respectively calculating the power P 1, P 2, and the power Said power P 3.
- the present application also provides a three-relay node cooperative communication method, which includes the following steps: the first node transmits the first node to the second node, the third node, the fourth node, and the fifth node with power P 0 .
- the second node amplifies the received first signal and sends it to the fifth node with power P 1
- the third node amplifies the received first signal and sends it to all cells with power P 2 Said fifth node
- said fourth node amplifying the received first signal and sending it to said fifth node with power P 3 , wherein said power P 1 , said power P 2 and said power P 3 It is determined according to a preset power P, a power P 0, and a preset power allocation rule
- the fifth node is configured to transfer data from the first node, the second node, the third node, and the fourth node.
- the first signal is merged.
- the present application further provides a three-relay node cooperative communication power distribution device, which includes a memory and a processor.
- the memory stores computer-readable instructions, and the computer-readable instructions are processed by the processor.
- the processor When executed, the processor is caused to execute the steps of a three-relay node cooperative communication power allocation method, where the power allocation method is used in a communication system, and the communication system includes a first node, a second node, a third node, and a fourth node.
- the first node is configured to transmit a first signal to the second node, the third node, the fourth node, and the fifth node with power P0, and the second node Configured to amplify the received first signal and send it to the fifth node with power P1, and the third node is used to amplify the received first signal and send it to the fifth node with power P2, so
- the fourth node is configured to amplify the received first signal and send it to the fifth node with power P3
- the fifth node is configured to send the first signal from the first node, the second node, and the first node.
- the method includes: determining the power P0; and calculating the power P1, according to a preset power P, the determined power P0, and a preset power allocation rule, respectively. Said power P2 and said power P3.
- the present application further provides a three-relay node cooperative communication device, which includes a memory and a processor.
- the memory stores computer-readable instructions.
- the processor executes the steps of the three-relay node cooperative communication method: the first node transmits a first signal to the second node, the third node, the fourth node, and the fifth node with power P 0 ; the second node Amplifying the received first signal and sending it to the fifth node with power P 1 , and the third node amplifying the received first signal and sending it to the fifth node with power P 2 , the first node
- the four nodes amplify the received first signal and send it to the fifth node with power P 3 , where the power P 1 , the power P 2, and the power P 3 are according to a preset power P, a power P 0 and a predetermined power allocation rule are determined; the fifth node is configured to combine first signals from the first node, the
- the present application further provides a non-volatile storage medium storing computer-readable instructions, and when the computer-readable instructions are executed by one or more processors, the one or more processors execute The steps of a three-relay node cooperative communication power allocation method, the power allocation method is used in a communication system, and the communication system includes a first node, a second node, a third node, a fourth node, and a fifth node.
- a node is configured to transmit a first signal to the second node, the third node, the fourth node, and the fifth node with power P0
- the second node is configured to transmit the received first signal Amplified and sent to the fifth node with power P1
- the third node is used to amplify the received first signal and sent to the fifth node with power P2
- the fourth node is used to send the received signal
- the first signal is amplified and sent to the fifth node with power P3
- the fifth node is configured to transmit the signals from the first node, the second node, the third node, and the fourth node.
- First signal merge , The method comprising: determining the power P0; according to a preset power P, the power P0 determined and a preset power allocation rule calculates the power P1, P2 and the power of the power P3.
- the present application further provides a non-volatile storage medium storing computer-readable instructions, and when the computer-readable instructions are executed by one or more processors, the one or more processors execute Steps of the three-relay node cooperative communication method: the first node transmits a first signal to the second node, the third node, the fourth node, and the fifth node with power P 0 ; the first signal that the second node will receive amplification and transmission at a power P 1 to the fifth node, a third point of the first received signal to amplification and transmission to the fifth node at a power P 2, the fourth received first point a signal amplification and transmission to the power P 3 at the fifth node, wherein the power P 1, the power and the power P 2 P 3 P according to a preset power, the power P 0 and a predetermined power allocation rule Determine; the fifth node is configured to combine the first signals from the first node, the second node, the third node, and the fourth node.
- this application realizes the maximization of the channel capacity of the system, and satisfies the system reliability and stability requirements for large data transmission.
- FIG. 1 is a flowchart of a method for cooperative communication between three relay nodes of this application
- FIG. 2 is a schematic diagram of a node device in a three-relay node cooperative communication system of the present application.
- terminal and “user equipment” used herein include both wireless signal receiver devices, and only devices with wireless signal receivers that do not have the transmission capability, as well as receiving and transmitting hardware.
- Such equipment may include: cellular or other communication equipment, which has a single-line display or a multi-line display or a cellular or other communication device without a multi-line display; PCS (Personal Communication Service, Personal Communication System), which can combine voice and data Processing, fax and / or data communication capabilities; PDA (Personal Digital Assistant), which may include radio frequency receivers, pagers, Internet / Intranet access, web browsers, notepads, calendars, and / or GPS (Global Positioning System (Global Positioning System) receiver; conventional laptop and / or palmtop computer or other device having and / or conventional laptop and / or palmtop computer or other device including a radio frequency receiver.
- GPS Global Positioning System
- terminal may be portable, transportable, installed in a vehicle (air, sea, and / or land), or suitable and / or configured to operate locally, and / or Runs in a distributed fashion on any other location on Earth and / or space.
- the "terminal” and “terminal equipment” used herein may also be communication terminals, Internet terminals, music / video playback terminals, such as PDA, MID (Mobile Internet Device), and / or music / video playback Functional mobile phones can also be smart TVs, set-top boxes and other devices.
- the three relay node cooperative communication power allocation method disclosed in the present disclosure is used in a communication system.
- the communication system includes a first node, a second node, a third node, a fourth node and a fifth node. Transmit a first signal to the second node, the third node, the fourth node, and the fifth node with power P 0 , and the second node is configured to amplify the received first signal and The power P1 is sent to the fifth node, the third node is configured to amplify the received first signal and sent to the fifth node at the power P2, and the fourth node is configured to send the received first signal The signal is amplified and sent to the fifth node with power P3, and the fifth node is configured to send the first signal from the first node, the second node, the third node, and the fourth node Merging, wherein the method includes:
- the three-relay node cooperative communication method disclosed in the present disclosure includes the following steps:
- Step 101 at a power P 0 of the first node to the second node, a third node, the fourth node and the fifth node transmitting a first signal;
- a first signal in step 102 the second node received and amplified at transmission power P 1 to the fifth node, a third point of said first signal received at a power amplification and transmission to the P 2 Said fifth node, said fourth node amplifying the received first signal and sending it to said fifth node with power P 3 , wherein said power P 1 , said power P 2 and said power P 3 Determined according to the preset power P, the power P 0 and the preset power allocation rule;
- Step 103 The fifth node is configured to combine first signals from the first node, the second node, the third node, and the fourth node.
- the above preset power allocation rules include:
- h sr1 represents the channel fading coefficient of the first node to the second node
- h sr2 represents the channel fading coefficient of the first node to the third node
- h sr3 represents the first node to the third node
- h r1d represents the channel fading coefficient of the second node to the fifth node
- h r2d represents the channel fading coefficient of the third node to the fifth node
- h r3d represents the The channel fading coefficients of the fourth node to the fifth node
- ⁇ is a Lagrangian multiplier of the following optimization problem:
- the AF cooperation protocol can be implemented in three phases:
- the source node transmits signals and transmits them to the destination and the relay respectively.
- the relay node amplifies the signal received from the source node, and then forwards the processed signal to the destination node with a certain power.
- the destination node In phase three, the destination node combines the signals received in the two phases. Here we use maximum ratio combining (MRC) to obtain the signal of the source node.
- MRC maximum ratio combining
- Equation (1-1) The power allocation optimization problem of the cooperative nodes using the AF protocol is shown in Equation (1-1).
- the signal propagation can be divided into two stages, that is, in a two-hop cooperative system, data transmission is completed. That is, the source node S broadcasts its information in the first step, that is, the broadcast stage.
- the received signal can be written as:
- Each relay performs a certain processing on the received signal, that is, amplifies the received signal from the source, and then forwards it to the destination with a certain power.
- the i-th relay sends the processed signal to the destination, that is:
- Amplification factor ⁇ i should satisfy constraints
- I AF in the case of multiple nodes becomes
- D receives N non-interfering source symbols from the relay. If the channel coefficient is known, the N symbols are coherently merged at D to improve the acceptance SNR (Signal-Noise Ratio).
- SNR Signal-Noise Ratio
- Step 201 The source node S transmits signals and transmits them to the destination node D and the relay node R1, the relay node R2, and the relay node R3, respectively.
- the signal transmitted by the source node S reaches the destination node D after attenuation and white noise.
- Step 202 The relay node R1, the relay node R2, and the relay node R3 amplify the signals received from the source node S respectively, and then forward the processed signals to the destination node D with a certain power.
- the signal received by the relay node R1 is expressed as:
- P 0 represents the transmission power of the source node S
- h sr1 represents the channel fading coefficient from the source node S to the relay node R1
- n sr1 represents the additive Gaussian white noise between the source node S and the relay node R1.
- the signal received by the relay node R2 is expressed as:
- P 0 represents the transmission power of the source node S
- h sr2 represents the channel fading coefficient from the source node S to the relay node R2
- n sr2 represents the additive white Gaussian noise between the source node S and the relay node R2.
- the signal received by the relay node R3 is expressed as:
- P 0 represents the transmission power of the source node S
- h sr3 represents the channel fading coefficient from the source node S to the relay node R3
- n sr3 represents the additive white Gaussian noise between the source node S and the relay node R3.
- the signal transmitted by the source node S reaches the relay node R1, the relay node R2, and the relay node R3 after attenuation and white noise, respectively.
- the relay node R1, the relay node R2, and the relay node R3 each amplify the signal from the source node S and send it to the destination node D.
- ⁇ represents the Lagrangian multiplier of the capacity optimization problem of the parallel relay channel maximization system under the AF strategy, that is, the Lagrange multiplier of the following optimization problem:
- ⁇ must satisfy: ⁇ ⁇ i
- Step 203 The destination node D uses the maximum ratio combining method (MRC) to combine the signals received in the two phases, thereby receiving the signal transmitted by the source node S.
- MRC maximum ratio combining method
- the signal received by the destination node is expressed as:
- P 0 represents the transmission power of the source node S
- h sd represents the channel fading coefficient from the source node S to the destination node D
- n sd represents the additive white Gaussian noise between the source node S and the destination node D.
- h r1d represents the channel fading coefficient from the relay node R1 to the destination node D
- ⁇ 1 represents the amplification coefficient of the relay node R1, which meets the constraint conditions.
- P 1 represents the transmission power of the relay node R1
- n r1d represents the additive Gaussian white noise between the relay node R1 and the destination node D.
- h r2d represents the channel fading coefficient from the relay node R2 to the destination node D
- ⁇ 2 represents the amplification coefficient of the relay node R2, which meets the constraint conditions.
- P 2 represents the transmission power of the relay node R2
- n r2d represents the additive Gaussian white noise between the relay node R2 and the destination node D.
- h r3d represents the channel fading coefficient from the relay node R3 to the destination node D
- ⁇ 3 represents the amplification factor of the relay node R3, which meets the constraint conditions.
- P 3 represents the transmission power of the relay node R3
- n r3d represents the additive Gaussian white noise between the relay node R3 and the destination node D.
- the source node described above also includes the case of being a certain relay node in another cooperative communication system. At this time, the "source signal" transmitted by the source node is actually a signal received by the relay.
- the destination node described above also includes the case of being a relay node in another cooperative communication system. At this time, the signals after the node is merged will be forwarded continuously.
- the device corresponding to each node in the foregoing communication system may include: a processor 1001, such as a CPU, a network interface 1002, a user interface 1003, and a memory 1004.
- the connection and communication between these components can be realized through a communication bus.
- the network interface 1002 may optionally include a standard wired interface (for connecting to a wired network), and a wireless interface (such as a WI-FI interface, a Bluetooth interface, an infrared interface, etc., for connecting to a wireless network).
- the user interface 1003 may include a display, an input unit such as a keyboard, and the optional user interface 1003 may further include a standard wired interface (for example, for connecting a wired keyboard, a wired mouse, etc.) and / or a wireless interface (for example, (For wireless keyboard, wireless mouse).
- the memory 1004 may be a high-speed RAM memory, or may be a non-volatile memory (non-volatile memory), such as a magnetic disk memory.
- the memory 1004 may optionally be a storage device independent of the foregoing processor 1001.
- the node device may further include a camera, an RF (Radio Frequency) circuit, a sensor, an audio circuit, a WiFi module, and the like.
- RF Radio Frequency
- node device structure shown in the figure does not constitute a limitation on the node device, and may include more or fewer components than those shown in the figure, or combine some components, or arrange different components.
- the performance of the cooperative communication system is closely related to the selection of the resource allocation strategy, and the power allocation problem is one of the important issues of resource allocation.
- the technical solution of the present application addresses the three relay nodes in the cooperative communication system based on the AF protocol.
- the configuration of transmission power achieves the effective allocation of power and maximizes the channel capacity of the system, and meets the requirements of system reliability and stability for large data transmission.
- the present disclosure includes equipment related to performing one or more of the operations described in the present disclosure. These devices may be specially designed and manufactured for the required purpose, or they may include known devices in general-purpose computers. These devices have computer programs stored therein that are selectively activated or reconstructed.
- Such a computer program may be stored in a device (e.g., a computer) readable medium or in any type of medium suitable for storing electronic instructions and coupled to a bus, respectively, said computer readable medium including but not limited to any Types of disks (including floppy disks, hard disks, CD-ROMs, CD-ROMs, and magneto-optical disks), ROM (Read-Only Memory, Read-Only Memory), RAM (Random Access Memory, Random Memory), EPROM (Erasable Programmable Read-Only Memory , Erasable programmable read-only memory), EEPROM (Electrically Programmable Read-Only Memory, electrically erasable programmable read-only memory), flash memory, magnetic card or optical card. That is, a readable medium includes any medium that stores or transfers information in a readable form by a device (eg, a computer).
- a readable medium includes any medium that stores or transfers information in a readable form by a device (eg, a computer).
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Abstract
本申请公开了一种三中继节点协作通信方法,其包括:第一节点以功率P 0发射信号;第二节点、第三节点、第四节点、第五节点各自分别接收信号;第二节点、第三节点、第四节点各自分别将接收到的信号放大后以功率P1、P2、P3转发;第五节点接收来自第二节点、第三节点、第四节点的信号,将来自第一节点、第二节点、第三节点和第四节点的信号合并。与现有技术相比,本申请通过对基于AF协议的协作通信系统中三个中继节点传输功率的配置,实现了系统信道容量的最大化,满足了大数据量传输对系统可靠性和稳定性的需求。
Description
本申请要求于2018年6月28日提交中国专利局、申请号为201810687559.4,发明名称为“三中继节点协作通信功率分配方法”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
本申请涉及无线通信技术领域,更具体地,涉及一种三中继节点协作通信功率分配方法。
协作通信是可通过用户之间在通信时的相互协作而形成虚拟的MIMO(Multiple Input and Multiple Output,多发射多接收天线)的一种空间分集技术。它克服了无线网络因为设备体积和功耗的限制不能在发射和接收时使用多天线发射接收技术的障碍,并能够达到MIMO空间分集技术的性能。
根据中继节点对信息的处理方式,协作通信协议可分为AF(Amplify and Forward,放大转发)协议和DF(Decode and Forward,译码转发)协议。AF协议是由中继将接收到的信号做简单的放大再转发给目的节点,发明人意识到这种方式系统开销和复杂度小,但也放大了噪声,降低了系统性能。对于使用AF协议的协作通信MIMO系统中包含三个中继节点的情况,目前的功率方案还存在协作链路容量不够大的问题。
有鉴于此,有必要提供一种能够解决上述技术问题的三中继节点协作通信功率分配方法。
发明内容
本申请的目的在于:克服现有技术的不足,提供一种具有理想的协作链路容量的三中继节点协作通信功率分配方法。
为了实现上述目的,本申请提供了一种三中继节点协作通信功率分配方法,所述功率分配方法用于通信系统,所述通信系统包括第一节点、第二节点、第三节点、第四节点和第五节点,所述第一节点用于以功率P
0向所述第二节点、所述第三节点、所述第四节点和所述第五节点发射第一信号,所述第二节点用于将接收到的第一信号放大并以功率P
1发送至所述第五节点,所述第三 节点用于将接收到的第一信号放大并以功率P
2发送至所述第五节点,所述第四节点用于将接收到的第一信号放大并以功率P
3发送至所述第五节点,所述第五节点用于将来自所述第一节点、所述第二节点、所述第三节点和所述第四节点的第一信号合并,其中,所述方法包括:确定所述功率P
0;按照预设功率P、所确定功率P
0和预设功率分配规则分别计算所述功率P
1、所述功率P
2和所述功率P
3。
为了实现上述目的,本申请还提供了一种三中继节点协作通信方法,其包括以下步骤:第一节点以功率P
0向第二节点、第三节点、第四节点和第五节点发射第一信号;所述第二节点将接收到的第一信号放大并以功率P
1发送至所述第五节点,所述第三节点将接收到的第一信号放大并以功率P
2发送至所述第五节点,所述第四节点将接收到的第一信号放大并以功率P
3发送至所述第五节点,其中,所述功率P
1、所述功率P
2和所述功率P
3根据预设功率P、功率P
0和预设功率分配规则确定;所述第五节点用于将来自所述第一节点、所述第二节点、所述第三节点和所述第四节点的第一信号合并。
为了实现上述目的,本申请还提供了一种三中继节点协作通信功率分配设备,包括存储器和处理器,所述存储器中存储有计算机可读指令,所述计算机可读指令被所述处理器执行时,使得所述处理器执行三中继节点协作通信功率分配方法的步骤,所述功率分配方法用于通信系统,所述通信系统包括第一节点、第二节点、第三节点、第四节点和第五节点,所述第一节点用于以功率P0向所述第二节点、所述第三节点、所述第四节点和所述第五节点发射第一信号,所述第二节点用于将接收到的第一信号放大并以功率P1发送至所述第五节点,所述第三节点用于将接收到的第一信号放大并以功率P2发送至所述第五节点,所述第四节点用于将接收到的第一信号放大并以功率P3发送至所述第五节点,所述第五节点用于将来自所述第一节点、所述第二节点、所述第三节点和所述第四节点的第一信号合并,其中,所述方法包括:确定所述功率P0;按照预设功率P、所确定功率P0和预设功率分配规则分别计算所述功率P1、所述功率P2和所述功率P3。
为了实现上述目的,本申请还提供了一种三中继节点协作通信设备,包括存储器和处理器,所述存储器中存储有计算机可读指令,所述计算机可读指令 被所述处理器执行时,使得所述处理器执行三中继节点协作通信方法的步骤:第一节点以功率P
0向第二节点、第三节点、第四节点和第五节点发射第一信号;所述第二节点将接收到的第一信号放大并以功率P
1发送至所述第五节点,所述第三节点将接收到的第一信号放大并以功率P
2发送至所述第五节点,所述第四节点将接收到的第一信号放大并以功率P
3发送至所述第五节点,其中,所述功率P
1、所述功率P
2和所述功率P
3根据预设功率P、功率P
0和预设功率分配规则确定;所述第五节点用于将来自所述第一节点、所述第二节点、所述第三节点和所述第四节点的第一信号合并。
为了实现上述目的,本申请还提供了一种存储有计算机可读指令的非易失性存储介质,所述计算机可读指令被一个或多个处理器执行时,使得一个或多个处理器执行三中继节点协作通信功率分配方法的步骤,所述功率分配方法用于通信系统,所述通信系统包括第一节点、第二节点、第三节点、第四节点和第五节点,所述第一节点用于以功率P0向所述第二节点、所述第三节点、所述第四节点和所述第五节点发射第一信号,所述第二节点用于将接收到的第一信号放大并以功率P1发送至所述第五节点,所述第三节点用于将接收到的第一信号放大并以功率P2发送至所述第五节点,所述第四节点用于将接收到的第一信号放大并以功率P3发送至所述第五节点,所述第五节点用于将来自所述第一节点、所述第二节点、所述第三节点和所述第四节点的第一信号合并,其中,所述方法包括:确定所述功率P0;按照预设功率P、所确定功率P0和预设功率分配规则分别计算所述功率P1、所述功率P2和所述功率P3。
为了实现上述目的,本申请还提供了一种存储有计算机可读指令的非易失性存储介质,所述计算机可读指令被一个或多个处理器执行时,使得一个或多个处理器执行三中继节点协作通信方法的步骤:第一节点以功率P
0向第二节点、第三节点、第四节点和第五节点发射第一信号;所述第二节点将接收到的第一信号放大并以功率P
1发送至所述第五节点,所述第三节点将接收到的第一信号放大并以功率P
2发送至所述第五节点,所述第四节点将接收到的第一信号放大并以功率P
3发送至所述第五节点,其中,所述功率P
1、所述功率P
2和所述功率P
3根据预设功率P、功率P
0和预设功率分配规则确定;所述第五节点用于将来自所述第一节点、所述第二节点、所述第三节点和所述第四节点 的第一信号合并。
本申请通过对基于AF协议的协作通信系统中三个中继节点传输功率的配置,实现了系统信道容量的最大化,满足了大数据量传输对系统可靠性和稳定性的需求。
图1为本申请三中继节点协作通信方法的流程图;
图2为本申请三中继节点协作通信系统中节点设备的示意图。
本技术领域技术人员可以理解,这里所使用的“终端”、“用户设备”既包括无线信号接收器的设备,其仅具备无发射能力的无线信号接收器的设备,又包括接收和发射硬件的设备,其具有能够在双向通信链路上,进行双向通信的接收和发射硬件的设备。这种设备可以包括:蜂窝或其他通信设备,其具有单线路显示器或多线路显示器或没有多线路显示器的蜂窝或其他通信设备;PCS(Personal CommunicationS Service,个人通信系统),其可以组合语音、数据处理、传真和/或数据通信能力;PDA(Personal Digital Assistant,个人数字助理),其可以包括射频接收器、寻呼机、互联网/内联网访问、网络浏览器、记事本、日历和/或GPS(Global Positioning System,全球定位系统)接收器;常规膝上型和/或掌上型计算机或其他设备,其具有和/或包括射频接收器的常规膝上型和/或掌上型计算机或其他设备。这里所使用的“终端”、“终端设备”可以是便携式、可运输、安装在交通工具(航空、海运和/或陆地)中的,或者适合于和/或配置为在本地运行,和/或以分布形式,运行在地球和/或空间的任何其他位置运行。这里所使用的“终端”、“终端设备”还可以是通信终端、上网终端、音乐/视频播放终端,例如可以是PDA、MID(Mobile Internet Device,移动互联网设备)和/或具有音乐/视频播放功能的移动电话,也可以是智能电视、机顶盒等设备。
本披露公开的三中继节点协作通信功率分配方法用于通信系统,所述通信系统包括第一节点、第二节点、第三节点、第四节点和第五节点,所述第一节点用于以功率P
0向所述第二节点、所述第三节点、所述第四节点和所述第五节点发射第一信号,所述第二节点用于将接收到的第一信号放大并以功率P1 发送至所述第五节点,所述第三节点用于将接收到的第一信号放大并以功率P2发送至所述第五节点,所述第四节点用于将接收到的第一信号放大并以功率P3发送至所述第五节点,所述第五节点用于将来自所述第一节点、所述第二节点、所述第三节点和所述第四节点的第一信号合并,其中,所述方法包括:
确定所述功率P
0;
按照预设功率P、所确定功率P
0和预设功率分配规则分别计算所述功率P
1、所述功率P
2和所述功率P
3。
需要说明的是,确定功率P和P
0的顺序不作限定。
请参阅图1,本披露公开的三中继节点协作通信方法包括以下步骤:
步骤101,第一节点以功率P
0向第二节点、第三节点、第四节点和第五节点发射第一信号;
步骤102,所述第二节点将接收到的第一信号放大并以功率P
1发送至所述第五节点,所述第三节点将接收到的第一信号放大并以功率P
2发送至所述第五节点,所述第四节点将接收到的第一信号放大并以功率P
3发送至所述第五节点,其中,所述功率P
1、所述功率P
2和所述功率P
3根据预设功率P、功率P
0和预设功率分配规则确定;
步骤103,所述第五节点用于将来自所述第一节点、所述第二节点、所述第三节点和所述第四节点的第一信号合并。
上述的预设功率分配规则包括:
通过如下公式计算所述功率P
1、所述功率P
2和所述功率P
3,
其中,符号(a)
+=max(a,0),
h
sr1表示所述第一节点至所述第二节点的信道衰落系数,h
sr2表示所述第一节点至所述第三节点的信道衰落系数,h
sr3表示所述第一节点至所述第四节点的信道衰落系数,h
r1d表示所述第二节点至所述第五节点的信道衰落系数,h
r2d表示所述第三节点至所述第五节点的信道衰落系数,h
r3d表示所述第四节点至所述第五节点的信道衰落系数,λ为以下优化问题的拉格朗日乘子:
以下首先介绍如何利用并行中继信道下最大化系统容量的优化问题实现三中继节点协作通信方法。
对于两个协作节点的情况,AF协作协议可以分为三个阶段实现:
阶段一,源节点发射信号,分别传输给目的以及中继。
阶段二,中继节点对接收到的来自源节点的信号进行放大,之后将处理后的信号以一定的功率向目的节点转发。
阶段三,目的节点对两个阶段接收到的信号进行合并,这里我们采用最大比合并(MRC,MaximalRatio Combining),从而得到源节点的信号。
为了计算三个节点之间的功率分配比例,我们先来推导多个节点的情况,假设一共的传输功率P是固定的,P
i是分配给第i个节点的功率。功率分配比a
i(i=0,1,L,N
T-1)等于P
i/P,它需要在节点功率分配比(a
0)和(N-1)中继(a
1,a
2,L a
N-1)上的最优配置来增大系统容量。
协作节点采用AF协议的功率分配优化问题如式(1-1)所示。
在多个协作节点的情形下,有一种情况也可以将信号传播分为两个阶段,那就是在两跳协作系统中,完成数据的传输。即源节点S在第一步广播它的信息,即广播阶段。第二步为多节点{R
i,i=1,2,L,N-1}平行传输,主要表现为多址接入阶段。S和R
i的传输功率分别由P
0和P
i(i=1,2,L,N-1)表示。正如上面所提到的同样的规则,在第一步,接收到的信号,可以写为:
每个中继对接收到的信号进行一定的处理,即对来自信源的接收信号进行放大,之后,以一定的功率将其转发到目的。在第二步第i个中继将处理后的信号再发给目的,即有:
在正交中继信道中,D从中继处接收N个互不干扰信源符号。若已知信道系数,N个符号在D相干归并来提高接受SNR(Signal-Noise Ratio,信噪比)。使用AF策略,并行中继信道下最大化系统容量的优化问题为:
上述最大化容量的功率分配策略的结果如下:
根据上述一些列的计算,我们将三个节点的情况分别带入公式(1-6)可得:基于AF协议三协作节点渐进最优功率分配方案为:
以下说明三中继节点协作通信方法的具体实施步骤。
步骤201:源节点S发射信号,分别传输给目的节点D以及中继节点R1、中继节点R2、中继节点R3。
源节点S发射的信号,经过衰减和白噪声后达到目的节点D。
步骤202:中继节点R1、中继节点R2和中继节点R3对各自接收到的来自源节点S的信号进行放大,之后将处理后的信号以一定的功率向目的节点D转发。
其中,P
0表示源节点S的传输功率,h
sr1表示源节点S至中继节点R1的信道衰落系数,n
sr1表示源节点S与中继节点R1间的加性高斯白噪声。
其中,P
0表示源节点S的传输功率,h
sr2表示源节点S至中继节点R2的信道衰落系数,n
sr2表示源节点S与中继节点R2间的加性高斯白噪声。
其中,P
0表示源节点S的传输功率,h
sr3表示源节点S至中继节点R3的信道衰落系数,n
sr3表示源节点S与中继节点R3间的加性高斯白噪声。
源节点S发射的信号,经过衰减和白噪声后分别到达中继节点R1、中继节点R2和中继节点R3。中继节点R1、中继节点R2和中继节点R3各自将来自源节点S的信号进行功率放大,并发送给目的节点D。
假设源节点以及三个中继节点发送功率的总和为P,符号(a)
+表示(a)
+=max(a,0),则三个节点各自发送的功率按以下方式分配。
同时,λ需满足:λ<γ
i
步骤203:目的节点D对两个阶段接收到的信号采用最大比合并法(MRC) 进行合并,从而接收到源节点S发射的信号。
其中,P
0表示源节点S的传输功率,h
sd表示源节点S至目的节点D的信道衰落系数,n
sd表示源节点S与目的节点D间的加性高斯白噪声。
目的节点D接收到来自中继节点R1的信号表示为:y
r1d=h
r1dβ
1y
sr1+n
r1d
目的节点D接收到来自中继节点R2的信号表示为:y
r2d=h
r2dβ
2y
sr2+n
r2d
目的节点D接收到来自中继节点R3的信号表示为:y
r3d=h
r3dβ
3y
sr3+n
r3d
需要说明的是,以上所述的源节点也包括作为另一个协作通信系统中的某一个中继节点的情况,此时源节点发射的“源信号”实际为转发所接收到的信号。以上所述的目的节点也包括作为另一个协作通信系统中的某一个中继节点的情况,此时,在该节点合并后的信号将被继续转发出去。
请参阅图2,前述通信系统中各节点对应的设备可以包括:处理器1001,例如CPU,网络接口1002,用户接口1003,存储器1004。这些组件之间的连接通信可以通过通信总线实现。网络接口1002可选的可以包括标准的有线接口(用于连接有线网络)、无线接口(如WI-FI接口、蓝牙接口、红外线接口等,用于连接无线网络)。用户接口1003可以包括显示屏(Display)、输入单元比如键盘(Keyboard),可选用户接口1003还可以包括标准的有线接口(例如用于连接有线键盘、有线鼠标等)和/或无线接口(例如用于连接无线 键盘、无线鼠标)。存储器1004可以是高速RAM存储器,也可以是稳定的存储器(non-volatile memory),例如磁盘存储器。存储器1004可选的还可以是独立于前述处理器1001的存储装置。
可选地,节点设备还可以包括摄像头、RF(Radio Frequency,射频)电路,传感器、音频电路、WiFi模块等等。
本领域技术人员可以理解,图中示出的节点设备结构并不构成对节点设备的限定,可以包括比图示更多或更少的部件,或者组合某些部件,或者不同的部件布置。
结合以上对本披露的详细描述可以看出,与现有技术相比,本披露至少具有以下有益的技术效果:
协作通信系统性能的优劣与资源分配策略的选择密切相关,而功率分配问题又是资源分配的重要问题之一,本申请的技术方案通过对基于AF协议的协作通信系统中三个中继节点传输功率的配置,实现了功率的有效分配和系统信道容量的最大化,满足了大数据量传输对系统可靠性和稳定性的需求。
本技术领域技术人员可以理解,本披露包括涉及用于执行本披露中所述操作中的一项或多项的设备。这些设备可以为所需的目的而专门设计和制造,或者也可以包括通用计算机中的已知设备。这些设备具有存储在其内的计算机程序,这些计算机程序选择性地激活或重构。这样的计算机程序可以被存储在设备(例如,计算机)可读介质中或者存储在适于存储电子指令并分别耦联到总线的任何类型的介质中,所述计算机可读介质包括但不限于任何类型的盘(包括软盘、硬盘、光盘、CD-ROM、和磁光盘)、ROM(Read-Only Memory,只读存储器)、RAM(Random Access Memory,随即存储器)、EPROM(Erasable Programmable Read-Only Memory,可擦写可编程只读存储器)、EEPROM(Electrically Erasable Programmable Read-Only Memory,电可擦可编程只读存储器)、闪存、磁性卡片或光线卡片。也就是,可读介质包括由设备(例如,计算机)以能够读的形式存储或传输信息的任何介质。
Claims (20)
- 一种三中继节点协作通信功率分配方法,所述功率分配方法用于通信系统,所述通信系统包括第一节点、第二节点、第三节点、第四节点和第五节点,所述第一节点用于以功率P 0向所述第二节点、所述第三节点、所述第四节点和所述第五节点发射第一信号,所述第二节点用于将接收到的第一信号放大并以功率P 1发送至所述第五节点,所述第三节点用于将接收到的第一信号放大并以功率P 2发送至所述第五节点,所述第四节点用于将接收到的第一信号放大并以功率P 3发送至所述第五节点,所述第五节点用于将来自所述第一节点、所述第二节点、所述第三节点和所述第四节点的第一信号合并,其中,所述方法包括:确定所述功率P 0;按照预设功率P、所确定功率P 0和预设功率分配规则分别计算所述功率P 1、所述功率P 2和所述功率P 3。
- 如权利要求1所述的三中继节点协作通信功率分配方法,按照预设功率P、所确定功率P 0和预设功率分配规则分别计算所述功率P 1、所述功率P 2和所述功率P 3包括:通过如下公式计算所述功率P 1、所述功率P 2和所述功率P 3,其中,符号(a) +=max(a,0), h sr1表示所述第一节点至所述第二节点的信道衰落系数,h sr2表示所述第一节点至所述第三节点的信道衰落系数,h sr3表示所述第一节点至所述第四节点的信道衰落系数,h r1d表示所述第二节点至所述第五节点的信道衰落系数,h r2d表示所述第三节点至所述第五节点的信道衰落系数,h r3d表示所述第 四节点至所述第五节点的信道衰落系数,λ为以下优化问题的拉格朗日乘子:
- 如权利要求1所述的三中继节点协作通信功率分配方法,所述预设功率P满足P=P 0+P 1+P 2+P 3。
- 如权利要求2所述的三中继节点协作通信功率分配方法,所述λ满足λ<γ i,i=1,2,3。
- 一种三中继节点协作通信方法,所述方法包括以下步骤:第一节点以功率P 0向第二节点、第三节点、第四节点和第五节点发射第一信号;所述第二节点将接收到的第一信号放大并以功率P 1发送至所述第五节点,所述第三节点将接收到的第一信号放大并以功率P 2发送至所述第五节点,所述第四节点将接收到的第一信号放大并以功率P 3发送至所述第五节点,其中,所述功率P 1、所述功率P 2和所述功率P 3根据预设功率P、功率P 0和预设功率分配规则确定;所述第五节点用于将来自所述第一节点、所述第二节点、所述第三节点和所述第四节点的第一信号合并。
- 如权利要求6所述的三中继节点协作通信方法,所述功率P 2和所述功率P 3根据预设功率P、预设功率P 0和预设功率分配规则确定包括:通过如下公式计算所述功率P 1、所述功率P 2和所述功率P 3,其中,符号(a) +=max(a,0), h sr1表示所述第一节点至所述第二节点的信道衰落系数,h sr2表示所述第一节点至所述第三节点的信道衰落系数,h sr3表示所述第一节点至所述第四节点的信道衰落系数,h r1d表示所述第二节点至所述第五节点的信道衰落系数,h r2d表示所述第三节点至所述第五节点的信道衰落系数,h r3d表示所述第四节点至所述第五节点的信道衰落系数,λ为以下优化问题的拉格朗日乘子:
- 如权利要求6所述的三中继节点协作通信方法,所述预设功率P满足P=P 0+P 1+P 2+P 3。
- 如权利要求7所述的三中继节点协作通信方法,所述λ满足λ<γ i,i=1,2,3。
- 一种三中继节点协作通信功率分配设备,包括存储器和处理器,所述存储器中存储有计算机可读指令,所述计算机可读指令被所述处理器执行时,使得所述处理器执行三中继节点协作通信功率分配方法的步骤,所述功率分配方法用于通信系统,所述通信系统包括第一节点、第二节点、第三节点、第四节点和第五节点,所述第一节点用于以功率P0向所述第二节点、所述第三节 点、所述第四节点和所述第五节点发射第一信号,所述第二节点用于将接收到的第一信号放大并以功率P1发送至所述第五节点,所述第三节点用于将接收到的第一信号放大并以功率P2发送至所述第五节点,所述第四节点用于将接收到的第一信号放大并以功率P3发送至所述第五节点,所述第五节点用于将来自所述第一节点、所述第二节点、所述第三节点和所述第四节点的第一信号合并,其中,所述方法包括:确定所述功率P0;按照预设功率P、所确定功率P0和预设功率分配规则分别计算所述功率P1、所述功率P2和所述功率P3。
- 根据权利要求11所述的三中继节点协作通信功率分配设备,按照预设功率P、所确定功率P 0和预设功率分配规则分别计算所述功率P 1、所述功率P 2和所述功率P 3包括:通过如下公式计算所述功率P 1、所述功率P 2和所述功率P 3,其中,符号(a) +=max(a,0), h sr1表示所述第一节点至所述第二节点的信道衰落系数,h sr2表示所述第一节点至所述第三节点的信道衰落系数,h sr3表示所述第一节点至所述第四节点的信道衰落系数,h r1d表示所述第二节点至所述第五节点的信道衰落系数,h r2d表示所述第三节点至所述第五节点的信道衰落系数,h r3d表示所述第四节点至所述第五节点的信道衰落系数,λ为以下优化问题的拉格朗日乘子:
- 根据权利要求11所述的三中继节点协作通信功率分配设备,所述预 设功率P满足P=P 0+P 1+P 2+P 3。
- 一种三中继节点协作通信设备,包括存储器和处理器,所述存储器中存储有计算机可读指令,所述计算机可读指令被所述处理器执行时,使得所述处理器执行三中继节点协作通信方法的步骤:第一节点以功率P 0向第二节点、第三节点、第四节点和第五节点发射第一信号;所述第二节点将接收到的第一信号放大并以功率P 1发送至所述第五节点,所述第三节点将接收到的第一信号放大并以功率P 2发送至所述第五节点,所述第四节点将接收到的第一信号放大并以功率P 3发送至所述第五节点,其中,所述功率P 1、所述功率P 2和所述功率P 3根据预设功率P、功率P 0和预设功率分配规则确定;所述第五节点用于将来自所述第一节点、所述第二节点、所述第三节点和所述第四节点的第一信号合并。
- 根据权利要求14所述的三中继节点协作通信设备,所述功率P 2和所述功率P 3根据预设功率P、预设功率P 0和预设功率分配规则确定包括:通过如下公式计算所述功率P 1、所述功率P 2和所述功率P 3,其中,符号(a) +=max(a,0), h sr1表示所述第一节点至所述第二节点的信道衰落系数,h sr2表示所述第一节点至所述第三节点的信道衰落系数,h sr3表示所述第一节点至所述第四节点的信道衰落系数,h r1d表示所述第二节点至所述第五节点的信道衰落系数,h r2d表示所述第三节点至所述第五节点的信道衰落系数,h r3d表示所述第四节点至所述第五节点的信道衰落系数,λ为以下优化问题的拉格朗日乘子:
- 根据权利要求14所述的三中继节点协作通信设备,所述预设功率P满足P=P 0+P 1+P 2+P 3。
- 一种存储有计算机可读指令的非易失性存储介质,所述计算机可读指令被一个或多个处理器执行时,使得一个或多个处理器执行三中继节点协作通信功率分配方法的步骤,所述功率分配方法用于通信系统,所述通信系统包括第一节点、第二节点、第三节点、第四节点和第五节点,所述第一节点用于以功率P0向所述第二节点、所述第三节点、所述第四节点和所述第五节点发射第一信号,所述第二节点用于将接收到的第一信号放大并以功率P1发送至所述第五节点,所述第三节点用于将接收到的第一信号放大并以功率P2发送至所述第五节点,所述第四节点用于将接收到的第一信号放大并以功率P3发送至所述第五节点,所述第五节点用于将来自所述第一节点、所述第二节点、所述第三节点和所述第四节点的第一信号合并,其中,所述方法包括:确定所述功率P0;按照预设功率P、所确定功率P0和预设功率分配规则分别计算所述功率P1、所述功率P2和所述功率P3。
- 根据权利要求17所述的非易失性存储介质,按照预设功率P、所确定功率P 0和预设功率分配规则分别计算所述功率P 1、所述功率P 2和所述功率P 3包括:通过如下公式计算所述功率P 1、所述功率P 2和所述功率P 3,其中,符号(a) +=max(a,0), h sr1表示所述第一节点至所述第二节点的信道衰落系数,h sr2表示所 述第一节点至所述第三节点的信道衰落系数,h sr3表示所述第一节点至所述第四节点的信道衰落系数,h r1d表示所述第二节点至所述第五节点的信道衰落系数,h r2d表示所述第三节点至所述第五节点的信道衰落系数,h r3d表示所述第四节点至所述第五节点的信道衰落系数,λ为以下优化问题的拉格朗日乘子:
- 一种存储有计算机可读指令的非易失性存储介质,所述计算机可读指令被一个或多个处理器执行时,使得一个或多个处理器执行三中继节点协作通信方法的步骤:第一节点以功率P 0向第二节点、第三节点、第四节点和第五节点发射第一信号;所述第二节点将接收到的第一信号放大并以功率P 1发送至所述第五节点,所述第三节点将接收到的第一信号放大并以功率P 2发送至所述第五节点,所述第四节点将接收到的第一信号放大并以功率P 3发送至所述第五节点,其中,所述功率P 1、所述功率P 2和所述功率P 3根据预设功率P、功率P 0和预设功率分配规则确定;所述第五节点用于将来自所述第一节点、所述第二节点、所述第三节点和所述第四节点的第一信号合并。
- 根据权利要求19所述的非易失性存储介质,所述功率P 2和所述功率P 3根据预设功率P、预设功率P 0和预设功率分配规则确定包括:通过如下公式计算所述功率P 1、所述功率P 2和所述功率P 3,其中,符号(a) +=max(a,0), h sr1表示所述第一节点至所述第二节点的信道衰落系数,h sr2表示所 述第一节点至所述第三节点的信道衰落系数,h sr3表示所述第一节点至所述第四节点的信道衰落系数,h r1d表示所述第二节点至所述第五节点的信道衰落系数,h r2d表示所述第三节点至所述第五节点的信道衰落系数,h r3d表示所述第四节点至所述第五节点的信道衰落系数,λ为以下优化问题的拉格朗日乘子:
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