用于调制宽带转换器压缩频谱感知的重构失败判定方法
doi: 10.11999/JEIT140127
A Reconstruction Failure Detection Scheme for Modulated Wideband Converter Based Compressed Spectrum Sensing
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摘要: 调制宽带转换器(Modulated Wideband Converter, MWC)压缩采样应用于频谱感知的一个基本前提是信号在频域上的稀疏性。如果信号不稀疏，将导致MWC重构结果不正确。该文提出了一种MWC压缩采样重构成败的判定方法。该方法利用连续两次重构得到的子带能量之间的相关性进行判决。仿真结果表明，该方法能够较准确地判断重构是否成功，应用于认知无线电频谱感知中能够避免频谱不稀疏时认知用户对主用户造成干扰，达到保护主用户的目的。Abstract: A basic premise for Modulated Wideband Converter (MWC) applying to spectrum sensing is that the signal spectrum is sparse. Otherwise, the reconstruction result will be incorrect. A method of judging whether the reconstruction is successful is proposed for MWC compressed sensing. It utilizes the correlation between two consecutive reconstructed subband energy. Simulation results show that the method can judge whether the reconstruction is successful with high accuracy, and can reduce the interference probability with primary users when the spectrum is not that sparse.
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