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Power allocation method in cognition orthogonal frequency division multiple access (OFDMA) system based on proportional fairness and interference constraints

A technology of proportional fairness and distribution method, applied in the fields of electrical components, wireless communication, etc.

Inactive Publication Date: 2011-08-10
ZHEJIANG UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

At the same time, for single-user carrier power allocation, in order to overcome the defect that the traditional water-filling algorithm needs iterative calculation to obtain a reasonable water-filling threshold, we propose a fast water-filling algorithm based on carrier signal-to-noise ratio sorting, which can Get water injection threshold in one step

Method used

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  • Power allocation method in cognition orthogonal frequency division multiple access (OFDMA) system based on proportional fairness and interference constraints
  • Power allocation method in cognition orthogonal frequency division multiple access (OFDMA) system based on proportional fairness and interference constraints
  • Power allocation method in cognition orthogonal frequency division multiple access (OFDMA) system based on proportional fairness and interference constraints

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Embodiment

[0043] The carrier allocation process in this embodiment does not belong to the research scope of this algorithm. The carrier allocation method in the reference algorithm (“Increasing in Capacity of Multiuser OFDM System Using Dynamic Subchannel Allocation”, in Proc.IEEE VTC, 2000) is adopted, and only the carrier During the allocation process, the power on each carrier is changed from the average allocation in the reference algorithm (“Increasing in Capacity of Multiuser OFDM System Using Dynamic Subchannel Allocation”, in Proc. IEEE VTC, 2000) to the carrier power constraint value in this example. For the convenience of understanding, the carrier allocation method in the revised reference ("Increasing in Capacity of Multiuser OFDM System Using Dynamic SubchannelAllocation", in Proc.IEEE VTC, 2000) is briefly described as follows:

[0044] (1) Initialize the carrier set of each cognitive user Initialize the rate R of each cognitive user k= 0, k = 1, 2, ... K, Ω is the total...

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Abstract

The invention discloses a power allocation method in a cognition orthogonal frequency division multiple access (OFDMA) system based on proportional fairness and interference constraints, comprising the following steps: firstly carrying out power allocation among cognitive users in accordance with proportional fairness factors, total power constraints and permanent speed values; then using a quick water injection method to carry out carrier power allocation by each cognitive user; if the carrier power of each cognitive user does not exceed a power constraint value, ending an algorithm, and otherwise, modifying allocated power of a carrier exceeding the power constraint to be the power constraint value; calculating the speed of the carrier and adding the speed to the permanent speed value of the user; eliminating the carrier from the carrier set of the user; and if the carrier set of each cognitive user is a null set, ending the algorithm, otherwise, subtracting the allocated power constraint value from a total power value, and repeating the above steps until the algorithm ends. The method is better in performances of the system capacity and the proportional fairness among the cognitive users, low in the algorithmic complexity and applied to engineering.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a power allocation method based on proportional fairness and interference constraints in a cognitive OFDMA system. Background technique [0002] Cognitive radio technology is a key technology to solve the current shortage of spectrum resources and low spectrum utilization. In cognitive radio, cognitive users can use idle frequency bands without interfering with licensed users by dynamically adjusting parameters such as transmission power, frequency, and modulation mode, thereby effectively improving spectrum utilization efficiency. Orthogonal Frequency Division Multiple Access (OFDMA) technology is currently recognized as a transmission technology that is easy to implement spectrum resource control. OFDMA technology can flexibly allocate system resources among users through spectrum combination and tailoring, which makes it a good combination with cognitive systems. In a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/08H04W72/54
Inventor 叶露张朝阳张志鹏王联响宫本康
Owner ZHEJIANG UNIV
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