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The channel capacity of a GSM frequency hopping network with intelligent underlay-overlay

In this paper a complete step by step method is described to increase the capacity of Global System for Mobile Communication (GSM) using the Intelligent Underlay Overlay(IUO) with frequency hopping and Discontinuous Transmission (DTX). The IUO splits the available frequencies into two layers, super and regular. Super layer frequencies have tighter reuse factor and can be accessed by only mobile stations (MS) having good C/I ratio while the regular frequencies can be used by MSs throughout the cell. The most promising work of this paper is that C/I ratio (hence reuse factor) is obtained by considering the first tier co-channel cells are also using IUO network structure. Analysis is performed by taking some default parameters into account shows that capacity enhancement up to 31 percent can be obtained with respect to a normal frequency hopping network.