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This dissertation was written as a part of the MSc in ICT Systems at the International Hellenic University. It analyzes the wireless networks for indoor environments and is separated in two main thematic sections, the Wi-Fi networks and the Femtocell net-works. In the beginning theoretical aspects are explained, having to do with: a) the 802.11 b and g networks, focusing mainly on the Physical and MAC layer, b) the fem-tocell networks and more specifically their access methods and interference, c) the wire-less indoor propagation, concentrating on the characteristics of a wireless channel and the propagation mechanisms. Moving now to the first section, it describes the Wi-Fi network of the International Hellenic University. For this reason the two buildings and the exact locations of the access points have been simulated in order to present parame-ters such as: 1) the received field from every access point, 2) the SINR, taking into ac-count access points from both the two floors, 3) the areas of available data transmission rates, for both 802.11b and 802.11g, based on the values of the SINR. The second part investigates the network of femtocells for four different buildings (sce-narios) with many apartments and one FAP in each of them. In this part the main pur-pose is the management of these networks in terms of the energy efficiency and fairness and for this reason, the parameters that are examined here, are: 1. Number of neighboring apartments that every femtocell can cover. 2. Number of Active FAPs, to cover requests from users of different apartments. 3. Time that every FAP operates, according to its coverage ability. 4. Time that a user is served from its own femtocell or from a neighboring. 5. Power consumption of the network and the energy saving. It is also very important before going to the main body of the project to express my gratitude to the supervisor of this dissertation Dr. Michela Meo and the co-supervisor Dr. George Koutita, for their valuable and implicit collaboration and assistance during the whole period of its preparation. Last but certainly not least, the parent’s contribution must also not be omitted, since it was of vital importance for the completion of the pro-ject.