认知无线电中跳频信号检测与参数估计

In Cognitive Radio system, the selection of algorithm for frequency-hopping signal detection and parameter estimation has an important impact on the accuracy and real-time character of spectrum sensing result. In this paper, the principle and application of Short Time Fourier Transform in time-frequency analysis algorithm is introduced briefly, and a detection scheme of frequency-hopping signal in Cognitive Radio system based on Short Time Fourier Transform is proposed. The simulation of common frequency-hopping signal detection using several window functions analysis in different SNR is presented and important parameters including hopping rate, frequency set can be estimated based on the detection result. The proposed scheme is verified by simulation result with its accuracy and less complexity, and can be applied to detection of frequency-hoping signal and parameter estimation in Cognitive Radio.