Cooperative Communication Method Based on Maximum Sum Rate in Cognitive Wireless Networks

Abstract

The invention provides a cooperative communication method based on maximum sum speed in a cognitive radio network. According to the new cooperative communication scheme, the sum speed of primary and secondary users in the cognitive radio network are maximized, the maximizing problem of the sum speed of the primary and secondary users is expressed as a combinational optimization problem by modeling, then auxiliary variable is introduced, the asked problem is equivalently converted into a standard assignment problem in an operational research, an algorithm is solved according to the assignment problem, and a primary and secondary user cooperative communication scheme based on the Hungary algorithm is provided. The changing situations of the sum speed of the primary and secondary users under different conditions are compared when the cognitive radio network adopts an AF cooperative communication manner, a DF cooperative communication manner and a direct communication manner respectively. A simulation result shows that when the number of secondary users is large, the sum speed can be improved by more than 1.3 times by adopting the new cooperative communication scheme, and the AF cooperative communication manner is more suitable than the DF cooperative communication manner in the cognitive radio network to improve the sum speed of the primary and secondary users.

Description

technical field [0001] The present invention relates to a method in the technical field of cognitive wireless networks, in particular to a cooperative communication scheme based on maximum sum rate in cognitive wireless networks. Background technique [0002] Cognitive wireless network is a key application technology to alleviate the problem of spectrum resource scarcity. There are two types of users in the network, one is the paying user or authorized user who can use a certain channel at any time, usually called the main user; A secondary user that communicates on a channel that is fully occupied by the primary user. The secondary user and the primary user realize coexistence through different communication methods, which greatly improves the utilization rate of the wireless spectrum. The key to the research and design of cognitive wireless networks is to realize the benign coexistence of secondary users and primary users. [0003] Akyildiz et al. published an article t...

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Problems solved by technology

However, the schemes in the above literatures do not take into account the actual state of the channel when performing cooperative communication, nor do they take into account the network and speed improvement that may be brought about by the secondary user's own communication.

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