Information energy cooperative beam forming method based on cognitive two-way relay network

A two-way relay and beamforming technology, applied in network planning, wireless communication, location diversity, etc., can solve problems such as signal mutual interference, and achieve the effect of improving performance

Inactive Publication Date: 2018-03-06
SUN YAT SEN UNIV
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Problems solved by technology

This leads to mutual interference between the signal received by the primary user and the signal received by the secondary user receiver

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  • Information energy cooperative beam forming method based on cognitive two-way relay network
  • Information energy cooperative beam forming method based on cognitive two-way relay network
  • Information energy cooperative beam forming method based on cognitive two-way relay network

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Embodiment Construction

[0043] Further set forth the present invention below in conjunction with accompanying drawing:

[0044] figure 1 It is a system model diagram of the present invention. In cognitive two-way relay networks, we consider the information energy collaboration of a primary system and a secondary system. The primary system consists of two single-antenna primary users, namely primary user 1 and primary user 2, which exchange information with each other. The secondary system consists of a multi-antenna secondary user transmitter and a single-antenna secondary user receiver. The sending end of the secondary user is equipped with N antennas to help the two-way communication between the primary users. The information and energy collaboration process of the entire network is divided into two continuous and equal time slots.

[0045] figure 2 It is an implementation flowchart of the information energy cooperative beamforming method based on the cognitive two-way relay network of the pr...

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Abstract

The invention discloses an information energy cooperative beam forming method based on a cognitive two-way relay network. According to the invention, the secondary user sending ends of multiple antennas collect energy from the signals of a primary user according to a power allocation scheme so as to forward the signals of the primary user and send their own signals. The purpose of the invention isto design beam forming matrixes, vectors and power allocation factors suitable for secondary user sending ends, so that the achievable rate at each secondary user is enabled to be maximal. Herein, the ideal channel state information for all known links of the secondary user sending ends is considered, and an optimization scheme based on Charnes-Cooper translation and one-dimensional search is provided. Through introducing the semi-definite relaxation method, an original optimization problem is converted into a convex semi-definite optimization problem. After that, the interior point method isadopted to solve and obtain an optimal beam forming matrix and a vector. According to the invention, through the cooperation of the information and the energy, the spectrum and energy insufficient problem can be alleviated to a certain degree, so that the system performance is improved.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to an information energy cooperative beamforming method based on a cognitive two-way relay network under ideal channel state information. Background technique [0002] Cognitive radio is an effective technology to improve the utilization of wireless spectrum resources in recent years. In a cognitive radio network, primary users (PUs) and secondary users (SUs) exist at the same time. These two types of users belong to different communication systems. The secondary users share the spectrum with the primary users without affecting the normal communication of the primary users. resource. Due to the limited interference power of the primary user, the transmission power of the secondary user is limited, thereby reducing the service quality of the secondary user and the coverage of the cognitive network. In order to further improve the spectrum utilization and improve th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/024H04B7/06H04W16/14
CPCH04B7/024H04B7/0617H04W16/14
Inventor 王琦李全忠
Owner SUN YAT SEN UNIV
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