Abstract
Future wireless communication systems are expected to provide more stable and higher data rate transmissions in the whole OFDMA networks, but the mobile stations (MSs) in the cell boundary experience poor spectral efficiency due to the path loss from the transmitting antenna and interference from adjacent cells. Therefore, satisfying QoS (Quality of Service) requirements of each MS at the cell boundary has been an important issue. To resolve this spectral efficiency problem at the cell boundary, deploying relay stations has been actively considered. As multihop/relay has complex interactions between the routing and medium access control decisions, the extent to which analytical expressions can be used to explore its benefits is limited. Consequently, simulations tend to be the preferred way of assessing the performance of relays. In this paper, we evaluate the performance of relay-assisted OFDMA networks by means of system level simulator (SLS). We consistently observed that the throughput is increased and the outage is decreased in the relay-assisted OFDMA network, which is converted to range extension without any capacity penalty, for the realistic range of values of the propagation and other system parameters investigated.
Highlights
Computer simulations are often used to predict the performance of cellular networks
Where PL(ik) ≡ path loss measured between relay i and user k, index 0 refers to the base station, NR is the total number of relays, ψ = 10 log10
Simulation runs in combined snapshot mode in which mobiles are randomly deployed at each transmission time interval (TTI) and simulation runs and results are collected for each TTI and average is performed
Summary
Computer simulations are often used to predict the performance of cellular networks. Typically, link level simulators are used to model the link between the base and mobile station, while system level simulators model the entire network. To most accurately predict the performance of cellular networks, a system level simulator, which includes the performance of link between each base and mobile station, should be used. Multihop-based network may improve system performance when cooperation relay technique is put to use. This is accomplished by sending information simultaneously via multiple different. The first concept follows a centralized approach, where the BS (base station) has full control over the relay-enhanced cell and RS may be very simple. In this paper we evaluate the performance of relay-assisted OFDMA network by mean of system level simulator which include both fixed and mobile relays by using centralized approach.
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