论文部分内容阅读
认知无线电中,主用户活动的随机性、无线信道的时变性及硬件设备的固有限制会使认知用户的监听结果出现误差,导致在数据传输时隙,主用户和认知用户之间出现传输碰撞。针对这种情况,研究了基于正交频分复用(OFDM)认知无线电中总有效可达吞吐量的最优化问题。利用拉格朗日乘子法推导了该问题的最优解,提出了一种基于混沌优化的搜寻算法以获取最优解。仿真结果验证了该算法的有效性。
Cognitive radio, the random activity of the main user activity, the wireless channel time-varying and the inherent limitations of hardware devices will make the cognitive user monitoring results error, resulting in the data transmission time slot, the main user and cognitive users appear Transmission collision. In view of this situation, the optimization problem based on the total effective throughput in Orthogonal Frequency Division Multiplexing (OFDM) cognitive radio was studied. The Lagrange multiplier method is used to derive the optimal solution of the problem, and a search algorithm based on chaos optimization is proposed to obtain the optimal solution. Simulation results verify the effectiveness of the algorithm.