感知无线电用户有效吞吐量的优化

OPTIMISING ACHIEVABLE THROUGHPUT OF COGNITIVE RADIO USERS

为了解决感知无线电中,非授权用户(SU)如何在不干扰授权用户(PU)正常通信的的情况下共享频谱资源和优化频谱利用率的问题,针对IEEE 802.22 WRAN,根据实际情况分析了检测概率、虚警概率以及感知时间对第二用户有效吞吐量的影响,从数学的角度阐述了感知时间和有效吞吐量的权衡问题。通过仿真验证了存在一个最优的感知时间,使得有效吞吐量达到最大。

In cognitive radio network, it＇s difficult for the second users （SU） to share the spectrum resources and to optimise the utility rate of spectrum with the primary users （PU） without interfering with their normal communications. To solve this problem, aiming at IEEE 802.22 WRAN and based on the practical situation ,we analysed the probability of detection, the probability of false alarm and the impact of sensing time on the second users＇ achievable throughput. We also expounded the tradeoffs between sensing time and achievable throughput. By simulating,we finally verified the existence of an optimum sensing time which makes the achievable throughput maximum.