Horizontal concurrent spectrum allocation method in cognitive wireless system

The invention discloses a horizontal concurrent spectrum allocation method in a cognitive wireless system. The invention relates to a spectrum allocation method belonging to the field of communication, and aims to solve the problem of poor fairness of the original concurrent method in spectrum allocation. The spectrum allocation method comprises the following steps of: I, establishing a topological graph according to the wireless network of the cognitive wireless system, and initializing, wherein the available spectrum number is M greater than or equal to 1; II, decomposing the topological graph into M sub-graphs; III, calculating the label number in each sub-graph Gk=(Vk, Ek) according to respective standards, calculating the cognitive user label for M*alpha sub-graphs in M sub-graphs by use of the collaborative maximum system total efficiency standard, and calculating the cognitive user label for the remaining M*(1-alpha) sub-graphs by use of the collaborative maximum proportional fairness standard; IV, all