中文摘要：

针对传统感知算法依赖主用户信号与噪声先验信息,以及易受噪声功率估计不确定性影响的缺点,提出了一种基于信号集合势和连续性的宽带频谱感知方案.该方案将宽带频谱感知分为主用户占子带集合势的估计和子带位置判决两步.在两次不同感知结果中利用主用户连续占用子带的特性,有效地实现最终感知性能的提升.理论分析和仿真结果表明,该方案不仅能够解决传统感知方法依赖噪声和主用户信号先验信息的问题,而且对抗噪声功率不确定性具有鲁棒性.特别地,与传统的能量检测频谱感知算法相比,该算法能有效地实现宽带频谱盲感知.

英文摘要：

To solve the problem that traditional spectrum sensing methods require a prior knowledge of the noise pow-er and the primary user signal,and are vulnerable to noise uncertainty,signal set cardinality and contiguity based wideband spectrum sensing schemes are proposed for cognitive radios.The proposed schemes perform wideband spectrum sensing in two phases：estimation of the cardinality of occupied subbands set and decisions of the occupied subband location.Through different cardinality estimations,performance can be effectively improved by exploiting occupied subbands continuity fea-ture.Theoretical analysis and simulation results verify that the proposed algorithm demands no a prior knowledge of the noise power and the primary user signal,and is robust against the noise power uncertainty problem.It can effectively discern sub-bands status blindly,compared with the conventional spectrum sensing methods.