关键词:动态频谱接入; 频谱空隙; 排队系统模型; 多信道
Performance analysis of dynamic spectrum access wireless transmission
MAO Jian-bing, MAO Yu-ming, LENG Su-peng, BAI Xiang
(National Key Lab of Communication, University of Electronic Science & Technology of China, Chengdu 610054, China)
Abstract:Dynamic spectrum access technology aims at improving spectrum utilization by allowing so-called secondary users to transmit in already assigned primary users’ bands, provided that no significant amount of interference was generated. Dynamic spectrum access radio devices looked for temporarily unoccupied frequency bands and attempted to communicate in them. This paper proposed two spectrum sharing schemes for dynamic spectrum access system, and both the impact on the primary user’s link performance and the transmission performance that could be acquired by the secondary user under the two spectrum sharing schemes were investigated using queueing system models. By optimizing the message length transmitted by the secondary user, it could improve the secondary user’s goodput and enhance the channel utilization. However, the throughput achieved by the secondary user can only approximate to an upper bound even though multiple channels are available for the secondary user to use.......