REDUCTION OF CO-CHANNEL INTERFERENCE IN CELLULAR NETWORK USING SECTORIZATION METHOD

Abstract

In this work, cell sectoring is used to reduce co channel interference in the reverse link of a wireless cellular network. The advantage that the number of interfering mobiles decreases with respect to the increase in the number of sectors is taken to sectorize a cell with 120 degrees opening per sector. Only the first tier is considered owing to the fact that the interference from other tiers is negligible.

Simulation of the result is done in Matlab and it is shown in terms of the signal-to-interference ratio (SIR), Bit error rate (BER), the received signal constellation which is shown in three categories namely: Result without sectoring, Result with sectoring, combined effect of result with sectoring and increase transmit power of the desired signal. It is deduced that with three sectored antenna incorporated, signal-to-interference ratio and Bit error rate improve by 0.77dB (21.8%) and 5.6dB (55%) respectively while the constellations of the received signal is better. A little more increase in the transmit power of the desired signal results to zero bit error and more appreciable improvement of about 4.5dB in signal-to-interference ratio while the constellation of the received signal is better.