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Cooperative transmission method of uplinks of secondary users in cognitive radio system

A cognitive radio and secondary user technology, applied in diversity/multi-antenna systems, transmission monitoring, transmission systems, etc., can solve the problem of selecting the number of cooperative users when multiple cooperative users are not considered, and the selection of cooperative users without consideration Problems, unfavorable actual scene applications, etc., to achieve the effect of meeting high flexibility and real-time performance, improving resource utilization, and reducing delay

Inactive Publication Date: 2011-06-01
PLA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

In this scheme, by adjusting the weight value of the antenna beam of the secondary user as the cooperative relay, the secondary user transmitter is assigned an appropriate transmit power, so that the system throughput can be improved, but the method proposed in this paper does not take into account Collaborative user choice problem
In addition, "Beamforming and Power Control for Multi-Antenna Cognitive Two-Way Relaying" published by K.Jitvanichphaibool and other scholars at the 2009 IEEE Wireless Communications and Networking Conference (2009 IEEE Wireless Communications International Conference) Following beamforming and power control in cognitive radio networks), this paper proposes a two-way relay transmission scheme for cognitive networks. The optimal and suboptimal beamforming matrices are obtained through singular value decomposition and search, and optimized The problem is solved to determine the transmission power of each secondary user, but the method proposed in this paper is only for the transmission mode of single-node cooperation, and does not consider the number of cooperative users when multiple cooperative users are selected. In addition, the algorithm proposed in this paper is complex High degree, easy to cause a large delay, which is not conducive to the application of actual scenarios

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  • Cooperative transmission method of uplinks of secondary users in cognitive radio system
  • Cooperative transmission method of uplinks of secondary users in cognitive radio system
  • Cooperative transmission method of uplinks of secondary users in cognitive radio system

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Embodiment 1

[0025] refer to image 3 , according to Embodiment 1 of the present invention, a cognitive radio system secondary user uplink coordinated transmission method, the cognitive radio system includes a primary user, a secondary user and a base station, and the uplink coordinated transmission The specific steps of the method are:

[0026] Step 1: After receiving the coordinated communication request from the secondary source user, the base station counts the total number of idle secondary users in the cell, which is recorded as F;

[0027] Step 2: The base station sends control information to F idle secondary users through the control channel CRCCH of the cognitive network and starts timing. The content of the control information includes the access mode of the secondary source user, the communication frequency band information of the secondary source user, and the base station Each idle secondary user is required to request channel information estimation between the idle secondary...

Embodiment 2

[0038] When the secondary source user accesses the network in an overlay spectrum access mode, according to Embodiment 2 of the present invention, a cognitive radio system secondary user uplink coordinated transmission method, the cognitive radio system includes a primary For the user, the secondary user and the base station, the specific steps of the uplink coordinated transmission method are as follows:

[0039] Step 1: After receiving the cooperative communication request from the secondary source user, the base station counts the total number of idle secondary users in the cell, sets the total number F of idle secondary users in the cell to 5, and numbers them as No. 1 and No. 2 respectively , No. 3, No. 4, No. 5;

[0040] Step 2: The base station sends control information to five idle secondary users through the control channel CRCCH of the cognitive network and starts timing. The content of the control information includes the access mode of the secondary source user, th...

Embodiment 3

[0049] When the secondary source user accesses the network in the underlay spectrum access mode, according to Embodiment 3 of the present invention, a cognitive radio system secondary user uplink coordinated transmission method, the cognitive radio system includes For primary users, secondary users and base stations, the specific steps of the uplink coordinated transmission method are:

[0050] Step 1: After receiving the cooperative communication request from the secondary source user, the base station counts the total number of idle secondary users in the cell, sets the total number F of idle secondary users in the cell to 5, and numbers them as No. 1 and No. 2 respectively , No. 3, No. 4, No. 5;

[0051] Step 2: The base station sends control information to five idle secondary users through the control channel CRCCH of the cognitive network and starts timing. The content of the control information includes the access mode of the secondary source user, the communication freq...

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Abstract

The invention relates to a cooperative transmission method of uplinks of secondary users in a cognitive radio system. The cognitive radio system comprises primary users, secondary users and a base station serving both the primary users and the secondary users. The cooperative transmission method comprises the following steps: selecting cooperative users undergoing cooperative forwarding from idlesecondary users according to the channel information; setting beamforming factors for the selected cooperative users according to the spectrum access mode of a secondary source user; and finding out the normalized eigenvector corresponding to the maximum eigenvalue to serve as the beamforming vector of a receiving array antenna of the base station by decomposing the H2H1PsW (H2H1PsW)H eigenvalue.Compared with the existing technical schemes, the technical scheme adopted by the invention has the following advantages: the cooperative transmission of the uplinks is realized through integration and reutilization of the idle secondary user resources, thus improving the transmission performance; and the scheme is simple and easy to realize and can meet the requirements of the cognitive radio system for high flexibility and instantaneity.

Description

technical field [0001] The invention relates to a cooperative transmission method for an uplink of a cognitive radio system, and belongs to the technical field of wireless communication. Background technique [0002] With the development of wireless communication technology, wireless spectrum resources become more and more scarce and precious. Cognitive Radio technology can allow secondary users (Secondary Users) in the network to dynamically use the idle spectrum of authorized primary users (Primary Users), effectively improve spectrum utilization, and solve the problem of spectrum scarcity. It has become an IMT- One of several breakthrough technologies from Advanced. In the current research on cognitive radio systems, there are mainly two modes of spectrum access for secondary users: the underlay mode and the overlay mode. The overlay mode stipulates that the secondary user can only use this spectrum when the primary user is not using it. The secondary user can negotiate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/14H04B7/08H04B17/00H04L1/06
Inventor 徐友云刘忠军张冬梅马月槐李默
Owner PLA UNIV OF SCI & TECH
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