Multi-user Detection Based on Weight approaching particle filter in Impulsive Noise

To solve the problem of particle degeneracy and sample impoverishment in conventional particle filter, we propose the weight approaching particle filter(WAPF) to increase the particle diversity before resampling step for adaptive multi-user detection (MUD) in synchronous code division multiple access (CDMA) system.. In the resampling step, particles are classified into two groups according to their particle-weights, and then the particles with the smaller weights are replaced by the mean of the two group particles, so that the particles can approach from the low likelihood region to the high likelihood region. Similar to the carrier wavemethod, the chaotic perturbation resampling method adopts the chaotic variable with the property of global ergodicity to ameliorate the diversity of samples and reduce the computation load. Simulation results demonstrate the feasibility of the improved particle filter.