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Next generation cellular radio systems will exceed the limitations of UMTS. The convergence of data and voice traffic will be supported by a flexible OFDM-based PHY layer and an OFDMA-capable MAC layer. The long term evolution (LTE) successor of the 3G systems incorporates this. But problems concerning coverage and capacity at the cell border still remain(More)
Mobile phones in today's era are not just small devices that provide the means of communication, rather, they are equipped with more processing power, storage capacity and battery performance. Now, the hand held devices are not only service consumers but are also capable of hosting and providing services to their peers. These services deployed on mobile(More)
Future OFDM-based cellular radio networks like IMT-Advanced systems are planned with both frequency division duplex and time division duplex in mind. Each of these duplex schemes has its benefits and drawbacks dependent on the scenario. In short-range communication and with small radio cells TDD is appropriate. For wide area cells FDD is preferred in(More)
Orthogonal frequency division multiple access (OFDMA) provides possibilities to exploit diversity of a frequency selective fading channel by appropriate resource scheduling strategies. This paper presents the performance comparison of different strategies with fair allocation of transmission capacity in a typical multiuser scenario. The analyzed performance(More)
Multimedia applications are bandwidth-hungry and delay-sensitive applications by nature. On the other hand, mobile networks are less bandwidth networks whereas mobile devices are resource constrained devices in terms of processing, storage and power. Thus talking about Mobile-to-Mobile (M2M) multimedia streaming, it becomes an ultimate responsibility of a(More)
T his Master Thesis presents the investigation and analysis of the upper capacity bound of infrastructure-based, multihop-augmented wireless networks. The capacity of a wireless network describes the maximum amount of information that can be transmitted in the network. The investigation starts by defining and studying Network States (NSs). A Network State(More)
Nowadays, the IEEE 802.11 infrastructure basic service set (BSS) network is the most widely used wireless LAN (WLAN) system. There are growing needs to interconnect access points (APs) of separate BSSs to create an IEEE 802.11 extended service set (ESS) mesh network over the wireless medium. Mesh distributed coordination function (MDCF) is a novel medium(More)
Multiple input-multiple output (MIMO) stands for a wide set of multiple antenna technologies, which significantly increase the capacity of wireless networks, without additional bandwidth or transmission power. They are widely recognized as methods that can meet the ever growing network capacity requirements. With a MIMO physical layer (PHY), the(More)
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