基于多小区OFDMA网络的动态频谱分配算法

　　为了提高频谱效率，给二级认知用户提供更多的频谱接入机会，同时保证用户的服务质量(QoS)，该文章基于传统的频率复用方法在多小区正交频分多址接入(OFDMA)系统的场景中提出了一种动态频谱分配(DSA)算法。该算法使得持有频谱执照者在认知无线电环境中在很大的区域内释放频谱给其他的二级市场，还建立了一个分配花费矩阵，使得小区间的干扰达到最小，保证了用户的服务质量(QoS)。与传统的频率复用方法相比，该算法有更好的频谱效率，并给二级市场的使用创造了更多的机会。

　　Abstract:

　　To improve the spectral efficiency，to offer more opportunity for secondary usage and to guararlee the quality of service(QoS) of the licensed users，This paper proposed a dynamic spectrum assignment(DSA) algorithms for multicell orthogonal frequency division multiple access(OFDMA) scenarios based on conventional frequency reuse strategies. According to the proposed algorithms，spectrum license holders can release spectrum bands in large geographical areas to other secondary markets in a cognitive radio environment.And it also built a cost assigning matrix and made the disturb between cells to the least，which guaranteed quality of service(QoS) of the licensed users in the system.Comparing with the traditional frequency reuse strategies，this algorithm has better spectral efficiency and gives more opportunities for secondary usage.