Inter-Cell Interference Modeling for OFDMA Systems with Beamforming

In this paper, a method of Gaussian approximation (GA) in a formulated manner is proposed to model inter-cell interference for OFDMA systems with beamforming. It is based on the parameters of 3GPP spatial channel model (SCM). For single-antenna OFDMA systems, the WINNER project proposed that the inter-cell interference can be modeled as white Gaussian noise. However, as indicated by itself, the validity of GA is not guaranteed for the scenarios with dominant interferer and multi-antenna. In this paper, the GA methodis extended into multi- antenna OFDMA systems with beamforming and the scenario with dominant interferer as well. A formula is proposed to calculate the variance of modeled Gaussian noise directly with the SCM parameters of AoD, AoA and power of each path. With this method, the complicated spatial channel models in interfering cells are not required for some applications, which help to speed up the simulation process with much lower computation and memory requirements.