A Real-time FPGA-based Emulation Method for No-Stationary Channel Fading

Due to high-speed movements of the transmitter and receiver, propagation channels have shown non-stationary characteristics. In this paper, based on the sum of linear-frequency-modulation signals (SoLFM) method, a new generation method for non-stationary channel fading is proposed. Meanwhile, theorical expresssions of statistical properties, i.e., time-variant probability density function (PDF) and the average gain of channel are derived and analyzed. On this basis, the proposed method is implemented on a Xilinx FPGA hardware platform. The time-variant PDF, autocorrelation function (ACF) and Doppler power spectrum (DPSD) of the emulator are also measured. Hardware measurements have shown that the output statistical properties are consistent well with the theoretical ones, which can be used for real-time simulation of non-stationary channel fading in laboratory environment