Abstract:

In heterogeneous networks where the Macro cell is overlaid by Pico cells,severe downlink interference is suffered by Pico users from the Macro base station of high transmission power. A beam nulling-user selection algorithm is proposed to suppress the interference from the Macro station and therefore enhance the system spectrum efficiency. The interference to Pico users is modeled and analyzed in a mathematical way. Simulation is performed to evaluate the enhancement of the proposed algorithm. It is shown that the performance is significantly improved in case of the high signal-to-noise ratio region or large number of Pico cells.

Key words: heterogeneous network, coordinated multi-point technology, beam nulling, user selection