Interference Mitigation in Femtocell using Optimized Power Control

Interference Mitigation in Femtocell using Optimized Power Control

Mutieb I. Al-Hmoudi (International Islamic University Malaysia, Malaysia) and Rashid Saeed (International Islamic University Malaysia, Malaysia)
DOI: 10.4018/978-1-4666-0092-8.ch005
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The femtocell network is a new technology that uses the advantage of an Internet backbone to enhance the cellular coverage in residential or small business areas. However, due to the expected random deployment of the Femtocell Access Point (FAP), there is a strong probability of interference among the femtocell nodes and between the femtocells and the macrocell nodes. In this chapter, an interference enhancement for OFDMA systems is developed and designed for two tiered macro-femtocell networks. An adaptive power control is calculated based on selecting the minimum interference channel with the optimized channel gain. In the simulation a number of the FAPs, the distance between the macrocell and the femtocell, and the path loss between the macrocell node and the FAPs are used as design parameters. By using optimized power control performance enhancement the interference degradation ratio can be observed.
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The Femtocells system like any other cellular communication technologies has a problem of the interference from other neighboring cells such as Macro, Micro and Pico cells. When a signal that is being transmitted from the Femtocell system to the user in the cell. Other users of the same network in other cell such as the Macro user are affected by the signal transmission of that femtocell as well as the other femtocell user.

Femtocell systems are expected to increase the capacity of the system in terms of number of users per cells or data rate per user. This because of the dedicated backhaul through fixed DSL, in opposite to micro and picocells which their backbone is taken directly from the macrocell Base Station (BS). Several challenges femtocells have to solve before they can be deployed, such as, seamless mobility and handover between different cells, spectrum allocation, sharing, and interference problems. The interference is one of the serious challenges that face the femtocell deployment since it affects the quality and the throughput of the system. Femtocell is suffers from interference from other femtocells and macrocell base stations. This due to the large number of FBS would be deployed by the customer in their premises. This interference is reducing the performance of FBS seriously if not tolerated. Interference can be in the form of femto-femto cells or femto-macrocells interference.

There are many scenarios that the femtocell will encounter interference problems because of it. Co-layer interference is one of it and it is described as the unwanted signal received at a femtocell and sent from other femtocells, decreasing thus the quality of its communication thus will cause many problems as follow:

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