CR OFDM系统中具有QoS要求的自适应资源分配算法

Adaptive resources allocation with QoS requirement in cognitive radio OFDM system

为了使CR OFDM系统能满足认知用户的QoS要求,针对系统中认知用户和授权用户间的互干扰影响,提出了一种具有QoS要求的自适应资源分配算法——ARAQ算法。算法中通过进行满足QoS要求的资源分配实现了容纳更多的认知用户,通过进行剩余子载波资源的再分配,进一步提高了频谱利用率。仿真结果表明:ARAQ算法比贪婪算法能容纳更多的认知用户数,同时频谱利用率很接近贪婪算法的频谱利用率且具有较低的算法复杂度。

To satisfy the quality of service（QoS） of cognitive radio users in cognitive radio OFDM system,a new adaptive resources allocation with QoS requirement algorithm（ARAQ）,which considered the mutual interference between licensed users（LU） and cognitive radio users（CRU）,was proposed.Through resources allocation of satisfying QoS requirement,the system could accept more cognitive radio users.Through the re-allocation of the residual subcarriers,the spectrum utility efficiency was improved.Simulation results show that the proposed algorithm can accept more cognitive radio users than the greedy algorithm,and that it is close to the greedy algorithm in spectrum utilization efficiency,but with a lower algorithm complexity.