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DF protocol based resource allocation method for two-way relay cognitive radio system

A cognitive radio and two-way relay technology, which is applied in the field of resource allocation in a two-way relay cognitive radio system, can solve problems such as high complexity, inability to obtain high system capacity, and difficulty in solving problems

Active Publication Date: 2016-10-12
NINGBO UNIV
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Problems solved by technology

Due to the limitation on the transmission power of cognitive users and the limitation on the interference of authorized users, the method of converting the optimization problem into a convex optimization problem and the method of applying Lagrange combined with the subgradient method to solve the problem have high complexity. It is not easy to solve; and the method of applying the average power method to solve can not get a higher system capacity

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  • DF protocol based resource allocation method for two-way relay cognitive radio system
  • DF protocol based resource allocation method for two-way relay cognitive radio system
  • DF protocol based resource allocation method for two-way relay cognitive radio system

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Embodiment Construction

[0075] The present invention will be further described in detail below in conjunction with the embodiments of the drawings.

[0076] The present invention proposes a resource allocation method in a DF protocol-based two-way relay cognitive radio system, and its overall implementation block diagram is as follows figure 2 As shown, it includes the following steps:

[0077] ①Set each channel in the two-way relay cognitive radio system to use the Dorayleigh fading model; set the two-way relay cognitive radio system to be composed of a cognitive mobile user, a base station, M relays and an authorized user , The cognitive mobile user, base station, m-th relay and authorized user are correspondingly marked as S, CB, RS m And PU, such as figure 1 As shown, where M> 1. In this embodiment, M=4, 1≤m≤M; it is assumed that there is no direct link between the cognitive mobile user and the base station, and L relays need to be selected for signal transmission, where 1≤L≤M .

[0078] Set each rel...

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Abstract

The invention discloses a DF protocol based resource allocation method for a two-way relay cognitive radio system. The method comprises the following steps: utilizing the characteristic of volume maximization of the DF protocol to obtain a power relationship among a cognitive mobile user, a base station and various relays; utilizing the relationship, power limitation conditions of the cognitive user for signal transmission to the relays, and power limitation conditions of the base station for signal transmission to the relays, so as to obtain a signal-to-noise ratio of the two-way relay cognitive radio system during signal transmission through each relay; carrying out permutation and combination of all the signal-to-noise ratios, so as to obtain a signal-to-noise ratio combination, in which the sum of all the signal-to-noise ratios reaches the maximum value while satisfying interference limitation conditions; and obtaining the maximum system capacity, the corresponding relay, and the power of the relay for signal broadcasting according to the sum of all the signal-to-noise ratios in the obtained signal-to-noise ratio combination. The method provided by the invention has the advantages that the system capacity is enlarged; only the power of each relay for signal broadcasting needs to be obtained, so that the power obtaining process is simplified, and the complicity is reduced.

Description

Technical field [0001] The present invention relates to a resource allocation technology in a relay cognitive radio system, in particular to a resource allocation method in a two-way relay cognitive radio system based on a DF (Decode and Forward) protocol. Background technique [0002] In recent years, wireless communication technology has developed rapidly. As the demand for wireless applications increases, the issue of spectrum shortage has become increasingly prominent. Cognitive radio technology effectively improves the efficiency of spectrum utilization by allowing cognitive users to dynamically access authorized frequency bands without affecting the normal work of authorized users. [0003] In order to meet people’s higher demand for wireless communication services, the new generation of wireless communication systems not only need to provide higher system capacity, but also need to meet user requirements for service quality, such as link reliability and network coverage. Wa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/04
CPCH04W72/0473H04W72/52H04W72/53
Inventor 李婷李有明余明宸付彩梅周桂莉
Owner NINGBO UNIV
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