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中文摘要：
基于传统单门限能量检测算法，提出了一种适用于认知无线电系统的两门限能量检测算法。在算法分析中定义了两个性能指标，即认知用户和主用户间的碰撞概率以及限制认知用户对频谱使用的限占概率。理论分析与仿真结果表明，与传统单门限能量检测算法相比较，两门限能量检测算法降低了认知用户和主用户间的碰撞概率，同时也引起限占概率的增加，即该算法能够在牺牲部分频谱效率的条件下，明显降低认知用户对主用户的干扰，保证了主用户使用频谱的优先权。
英文摘要：
Based on the conventional single-threshold energy detection algorithm, the paper proposes a novel double-threshold energy detection algorithm for cognitive radio systems. For farther research, two performance indexes, the probability of collision between the cognitive user and the primary user and the probability of spectrmn unavailable to the cognitive user, are defined. The theoretical analysis and the simulation results indicate that this strategy can make a great decrease of the probability of collision between the cognitive user and the primary user, while the probability of spectrum unavailable has a little deterioration. That is to say, this algorithm can protect the primary user perfectly in the case of sacrificing some spectrum efficiency for cognitive user.
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