基于认知无线电的LTE系统频谱感知方法

摘要

提出一种认知无线电技术框架下LTE系统中femtocell的频谱感知方法。在该方法中，femtocell对上行频谱进行能量检测，通过一种两步决策的频谱感知技术，发现周围正在承载业务的macrocell用户，并进一步对其承载的业务类型进行识别，根据不同的业务类型，调整感知周期，使其在femtocell取得的吞吐量和耗费的感知能量之间进行有效折中。仿真结果表明，该方法可在控制对macrocell用户的干扰和控制感知开销的情况下，提高femtocell小区的吞吐量，提高系统性能。%A spectrum sensing method in the femtocell of long time evolution (LTE) system is proposed. In this method, the femtocells sense the uplink spectrum via energy sensing and discover the active macrocell users through two-steps decision spectrum sensing method. The femtocells identify the traffic types of these active macrocell users and adjust the sensing period according to different traffic types to implement the tradeoffs between throughput and sensing overhead of femtocells. Simulation results indicate that this method can improve the femtocell throughput and system performance when the interference to macrocell users and sensing overhead are effectively controlled.