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Beam-forming-based power distribution method for cognitive radio system

A cognitive radio and beamforming technology, applied in the resource allocation field of cognitive radio system, can solve problems such as cognitive user interference

Inactive Publication Date: 2014-07-23
NANJING UNIV OF POSTS & TELECOMM
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AI Technical Summary

Problems solved by technology

Since the two types of systems use the same spectrum to work at the same time, the base station of the main system will also cause interference to cognitive users

Method used

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  • Beam-forming-based power distribution method for cognitive radio system
  • Beam-forming-based power distribution method for cognitive radio system
  • Beam-forming-based power distribution method for cognitive radio system

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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. A cognitive radio system includes a cognitive base station and K cognitive users SU 1 ,...,SU K , a primary base station and L primary user PUs 1 ,...,PU L . Among them, the cognitive base station and each cognitive user are equipped with M t and M r The main base station and the main user use a single antenna for communication. The signal received by the kth cognitive user can be expressed as:

[0045] y k = w k H ( g ssk t k s k + Σ i = 1 ...

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Abstract

The invention provides a beam-forming-based power distribution method for restraining interference between a cognitive base station and a master user and improving the performance of a cognitive system at the cognitive environment. The method comprises the steps that a plurality of antennas are respectively used at the cognitive base station side and cognitive user sides; according to the channel environment of the system, the beam forming technology is adopted at the cognitive base station side and the cognitive user sides for distributing transmitting power to the multiple cognitive users. In the power distributing process, the interference between the cognitive system and a main system and the performance indexes of the cognitive system and the main system are taken into consideration at the same time, and the optimization theory is used for modeling beam forming and power distribution problems of the cognitive system to be a multiobjective optimization problem. In the optimal solution solving process, beam forming and power distribution are achieved through an iterative method based on the fixed variate thought. The beam-forming-based power distribution method has the advantages of being low in complexity, high in rate of convergence and the like, and has the certain application value in the actual use process.

Description

technical field [0001] The invention belongs to the field of cognitive radio system resource allocation, and in particular relates to a power allocation method for a cognitive multiple-input multiple-output (MIMO) system based on beamforming technology to suppress inter-system interference. Power allocation is achieved by designing beamforming vectors to improve system performance. Background technique [0002] Throughout the trend of rapid development of wireless communication technology, people's demand for mobile communication and broadband access services is increasing, and the scarcity of available spectrum resources is becoming more and more obvious. Today's spectrum allocation strategy adopts a fixed spectrum allocation policy, that is, wireless spectrum resources are planned uniformly by the government. However, it is precisely because of this allocation strategy that some frequency bands have not been fully utilized in practice. For example, the NPRM of the US Fede...

Claims

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Application Information

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IPC IPC(8): H04W52/34H04W52/42H04B7/06
Inventor 刘旭朱文涛杨京波
Owner NANJING UNIV OF POSTS & TELECOMM
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