Downlink Beamforming Algorithms With Inter-Cell Interference in Cellular Networks
The authors study the issue of handling unknown inter-cell interference in multi-cell environments with antenna arrays at the base stations. First, they demonstrate that the presence of unknown inter-cell interference that cannot be predicted accurately can significantly degrade the system performance when unaccounted for. Second, they propose two algorithms that are aimed at providing a quality-of-service guarantee in the form of Packet Error Rate (PER) in the presence of unknown inter-cell interference. The first algorithm is based on a derived expression for average PER as a function of the distribution of experienced signal to interference and noise ratio and dynamically adjusts the input parameters based on the channel condition and interference.