Downlink performance of two-tier networks with time-hopping modulation


Downlink performance of two-tier networks with time-hopping modulation


With growing demand for prime information rates, the mobile network has faced excessive traffic and it appears that one among the few long-term solutions to the current downside is using femtocells which improve capacity and indoors coverage. In the typical femtocell networks, co- and cross-layer interferences caused by simultaneous transmission of macrocell base stations and femtocell access points in the identical frequency band, ends up in dead spots especially if femtocells are densely employed. During this study, to mitigate the interference and improve the system’s performance, the authors study the applying of your time-hopping approach. Significantly, the impact of aggressive signals of femto access points on a macro user equipment located within the second tier, that’s, the femtocell coverage area, is analysed and also the semi-closed-kind expression for the system outage probability is derived. Based mostly on the analysis, they conjointly simulate the transmission capacity (TC) that represents the whole capability of the co-channel two-tier networks with outage constraints. Next, using Gaussian approximations, they derive higher and lower bounds on the outage chance. These bounds give higher insight on the impact of system’s parameters on its performance. Their numerical results show that the time-hopping technique considerably reduces the outage chance and therefore will increase the TC of two-tier networks.

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