Resource allocation method in two-way relay cognitive radio system based on df protocol

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: 2019-08-20
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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  • Resource allocation method in two-way relay cognitive radio system based on df protocol
  • Resource allocation method in two-way relay cognitive radio system based on df protocol
  • Resource allocation method in two-way relay cognitive radio system based on df protocol

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Embodiment Construction

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

[0076] A resource allocation method in a two-way relay cognitive radio system based on the DF protocol proposed by the present invention, its overall realization 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 adopt the Dorelli fading model; set the two-way relay cognitive radio system to consist of a cognitive mobile user, a base station, M relays and an authorized user , denote the cognitive mobile user, base station, mth relay and authorized user as S, CB, RS m and PU, such as figure 1 As shown, where M>1, M=4 in this embodiment, 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, Among them, 1≤L≤M.

[0078] It is set tha...

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Abstract

The invention discloses a resource allocation method in a two-way relay cognitive radio system based on the DF protocol, which uses the capacity maximization feature of the DF protocol to obtain the power relationship between cognitive mobile users, base stations and each relay; and then Using this relationship and the power constraints used by cognitive mobile users to transmit signals to the relay, and the power constraints used by the base station to transmit signals to the relay, the two-way relay cognitive radio system is obtained when transmitting signals through each relay SNR, and then find a set of SNR combinations by permuting and combining all SNRs, the sum of all SNRs is the largest under the condition of meeting the interference limit, and then according to all the SNR combinations found The sum of the signal-to-noise ratio is used to obtain the maximum system capacity and the power used for the corresponding relay and relay broadcast signals; the advantage is that the system capacity is improved, and only the power used for each relay broadcast signal can be solved, simplifying The power solution process is simplified and the complexity 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, decoding and forwarding) protocol. Background technique [0002] In recent years, wireless communication technology has developed rapidly. With the increase of wireless application demands, the problem of spectrum shortage has become increasingly prominent. Cognitive radio technology effectively improves spectrum utilization efficiency by allowing cognitive users to dynamically access licensed frequency bands without affecting the normal work of licensed 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 users' requirements for service quality, such as link reliability ...

Claims

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Application Information

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Patent Type & Authority Patents(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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