Transform Domain Communication System Based on Random-Ambiguity and Fractional Fourier Transform

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Transform domain communication system (TDCS) using transform domain processing is demonstrated as having enhanced interference avoidance capability under adverse environmental conditions. Many transform methods can be used in the TDCS, a method is proposed in the paper which is based on random-ambiguity transform (RAT) plus fractional Fourier transform (FRFT). The proposed TDCS and its response to nonstationary interference scenarios are modeled and simulation results obtained using MATLAB. The proposed method has a good ability to anti any narrowband continuous nonstationary jammers. The system was evaluated using an E <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">b</sub> /N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> of -7.0 dB and interference energy-to-signal energy (J/E) ratios ranging from 0 dB to 16.0 dB. For BCSK (binary cyclic shift key) data modulation cases, the average TDCS bit error performance improvement is more than 14 dB relatives to a DSSS system according to different J/E. Collectively, these results indicate that the proposed TDCS using RAT-FRFT for interference mitigating is a viable option in nonstationary jammers scenarios