Cognitive radio frequency spectrum detection-The spectrum sensing of a wideband frequency range is studied by dividing it into multiple subbands. It is assumed that in each subband either a primary user (PU) is active or absent in a additive white

真是基于matlab的QPSK，格雷码，瑞利衰减信道，加性高斯白噪声仿真-Really based on matlab QPSK, Gray code, Rayleigh fading channel additive white Gaussian noise simulation