Cooperative Correlation Based Spectrum Sensing for DMB-T Systems

Cooperative spectrum sensing scheme for Digital Multimedia Broadcasting-Terrestrial (DMB-T) system in China is investigated in this paper. There are three frame header modes defined in DMB-T Standard. For frame header mode 2, the only PN sequence is utilized to perform waveform-based spectrum sensing, and an improved synchronization algorithm is proposed. For frame header mode 1 and 3, extended pseudonoise (PN) sequences are proposed to be the local correlation sequences to perform waveform-based spectrum sensing. The performance of the proposed schemes is analyzed theoretically. Moreover, the performance of cooperative spectrum sensing schemes over the Rayleigh fading reporting channel is studied. When the probability of false alarm is 0.01 and the number of signal frame used is 1, it is shown that the probabilities of missed detection of the proposed schemes are much lower than that of the present PN correlation (PNC) and cyclic extension correlation (CEC) schemes. And the performance of the cooperative spectrum sensing is limited by both local detectors and the probability of reporting error.