Coordinative Stochastic Resonance Filtering Based Inter-cell Interference Suppression in FrFT-OFDMA Cellular Systems

In fractional Fourier transform (FrFT) based orthogonal frequency division multiple access cellular systems, the inter-cell inference combined with multiple linear frequency modulated (LFM) signals degrades the system performance at the receiver. A novel coordinative stochastic resonance (CSR) filtering method, which is described by an overdamped bistable dynamical system, is proposed to improve the signal-to-interference-plus-noise ratio (SINR), which is defined to characterize CSR in optimal FrFT domain. Simulation results show that the output SINR is effectively improved by the use of CSR filter, which is based on the underlying mechanism that interfering LFM signals cooperate with noise in part to promote particles motion periodically with larger amplitude in a symmetric double well.