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Power distribution method used in cognitive wireless relay network

A wireless network and cognitive relay technology, which is applied in the field of power allocation in cognitive relay wireless networks, can solve the problems of high computational complexity and large number of iterations in power allocation methods for bidirectional cognitive wireless networks

Active Publication Date: 2014-06-25
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem of high computational complexity and many iterations of the two-way cognitive wireless network power allocation method based on the amplification and forwarding relay protocol, and introduces the Cauchy-Schwartz inequality to provide a more optimal A low-complexity relay power allocation method

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  • Power distribution method used in cognitive wireless relay network
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  • Power distribution method used in cognitive wireless relay network

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Embodiment Construction

[0024] The invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] 1. Build a model

[0026] Such as figure 1 As shown, the model of the present invention includes a primary user PU and two secondary users SU 1 and SU 2 , due to the poor quality of the communication channel between the two secondary users, it must be in the relay set {R 1 , R 2 ,...R N} in the cooperation of N relay nodes to help users transmit signals next time. The present invention assumes that each node has only one antenna and cannot send and receive at the same time, and SU 1 or SU 2 Grasp all the instantaneous channel state information (Channel State Information, CSI), this process can be obtained through the traditional channel state information acquisition method. Power Allocation Process at SU 1 or SU 2 Execute at , and the optimal power allocation result is sent to each node through an additional auxiliary channel.

[0027] The communica...

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Abstract

The invention discloses a power distribution method used in a cognitive wireless relay network. In the method, a bilateral cognitive wireless network based on amplifying and forwarding relaying protocols is used as a main body. The bilateral cognitive wireless network includes a master user, two secondary users and N relay nodes. On the condition that the power of each node is limited, the suboptimal power distribution method based on the Cauchy-Schwarz inequality enables the system capacity of the secondary users to be maximized and guarantees the service quality of the master user in the whole communication process. Different from a traditional relay network resource allocation method, the Cauchy-Schwarz inequality is introduced into the method, an iterative method is avoided, the calculation complexity is greatly reduced, and the performance approaching to an optimal power distribution method based on an IPM is achieved.

Description

technical field [0001] The invention relates to the technical field of computer wireless communication, in particular to a power allocation method in a cognitive relay wireless network. Background technique [0002] Multiple-input multiple-output (MIMO) technology can effectively resist the influence of multipath fading in wireless communication, but it is difficult to be applied in actual wireless communication terminals due to the limitations of equipment size, cost and hardware performance. Cooperative communication technology utilizes mutual cooperation among single-antenna mobile terminals to share each other's antennas to form a virtual MIMO system, thereby obtaining space diversity. Future wireless communication systems need to provide more high-speed multimedia services and data services. The purpose of cooperative communication is to make full use of node resources in the network to help nodes with communication needs perform high-speed and reliable wireless communi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/18
Inventor 周曈许建真
Owner NANJING UNIV OF POSTS & TELECOMM
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