Spectrum Sensing for DTMB-A System Using Accumulated Autocorrelation

Abstract

The digital terrestrial television multimedia broadcasting - advanced (DTMB-A) system demands an accurate and reliable spectrum sensing method for its implementation. In this paper, an effective method based on weighted autocorrelation of the frame headers is proposed for single-node spectrum sensing in DTMB-A. The decision threshold, lower bounds and miss detection rate of the proposed method are researched in detail. Simulation results indicate that the proposed method shows better sensing accuracy and robustness compared with the existing methods under various channels, while the cost of its higher complexity is acceptable. Furthermore, by using piecewise-weighted information fusion, the proposed method is extended into cooperative spectrum sensing to overcome the problems of shading and hidden terminals in networking. Our work ensures the efficiency of spectrum sensing and contributes to the better use of DTMB-A system in future applications.