一种基于信道质量的鲁棒机会频谱接入策略

Robust opportunistic spectrum access policy based on channel quality

为了提高分等级网络中次用户通过机会频谱接入获得的有效吞吐率,提出了一种基于信道质量的鲁棒机会频谱接入策略.该策略利用信道质量信息和信道占用信息做出传输决策,使得次用户在信道感知结果为空闲和占用时分别以不同的信道质量门限选择传输机会发起传输,充分利用了信道质量好的传输机会.结合该策略,建立了以对主用户的干扰为约束条件,最大化次用户有效吞吐率的优化问题,并考虑到了信道传播特性统计参数存在不准确估计的情况,对该接入策略的门限进行了鲁棒性设计.仿真结果表明:所提出的鲁棒机会频谱接入策略能够显著提高次用户的有效吞吐率.

To improve the effective throughput achieved by opportunistic spectrum access of secondary user in hierarchical networks,a robust opportunistic spectrum access policy based on channel quality is proposed.The proposed policy fully utilizes the transmission opportunities with good channel quality by taking both channel quality information and channel occupation information into account to make transmission decisions,which enables secondary user to access channel in sensed idle and busy states with different channel quality thresholds.With this policy,an optimization problem maximizing the effective throughput of secondary user with interference constraint for protecting primary user is formulated,and the optimal robust channel quality thresholds are derived considering the existence of inaccurate estimation to the channel propagation property.Simulation results demonstrate the effective throughput performance of secondary user can be significantly improved by implementing the proposed policy.