Considering that the traditional spectrum sensing method does not take into account the impact of the energy consumption, a joint optimization of spectrum sensing method under the energy constraints for OFDM system was proposed. Based on the traditional energy detection, the spectrum sensing problem was modeled into an optimization problem. Both the sensing time and the decision threshold parameters of each band were optimized, under the energy-constrained case, to maximize the total throughput of the system. The simulation results show that, compared with the traditional detection method, the system using the proposed method not only has higher throughput, but also saves more energy.%针对传统频谱感知方法没有考虑能耗受限对认知系统的影响,以认知正交频分复用(OFDM)系统为背景,提出一种基于能耗受限的联合优化频谱感知方法.该方法基于传统能量检测方法,以最大化吞吐量性能为目标,将频谱感知问题建模为一个优化问题,联合多个频带选取最优感知时间和判决门限参数,使其在能耗受限的情况下,总吞吐量达到最大.仿真结果表明,与传统使用能耗均分的检测方法相比,该方法具有更大的吞吐量,能够更好地节约能耗.
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