Cascaded Stochastic Resonance for Digitized Receiving of Linear Frequency Modulation Signal
Hou Cheng-guo① Luo Bo-wen① Li Di②
①(Information System Engineering Institute, PLA Information Engineering University, Zhengzhou 450002, China) ②(Troops 69260 of PLA, Urumqi 830000, China)
In order to eliminate the narrowband limit of stochastic resonance system, and to complete the digitized receiving of linear frequency modulation signal with high gain, a method based on the frequency setting of received digital samples is proposed. In this method, the linear frequency modulation is directly sent to the digitized samples flitting, frequency setting process, and is converted to a single frequency signal, which fits in the subsequent cascaded stochastic resonance system. As a result, the noise energy in broadband signal is converted to signal energy. Theory and simulation results show that the algorithm can demodulate the linear frequency modulation signal, and its processing gain is higher than the existing algorithms by about 2 dB.
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Hou Cheng-guo, Luo Bo-wen, Li Di. Cascaded Stochastic Resonance for Digitized Receiving of Linear Frequency Modulation Signal. JEIT, 2015, 37(12): 2866-2871.
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