LTE networks’ main challenge is to efficiently use the available spectrum, and to provide satisfying quality of service for mobile users. However, using the same bandwidth among adjacent cells leads to occurrence of Inter-cell Interference (ICI) especially at the cell-edge. Basic interference mitigation approaches consider bandwidth partitioning techniques between adjacent cells, such as freque...

Using analytic models and simulation results, we examine spatial reuse and the effectiveness of RTS/CTS MAC protocols in underwater acoustic networks. We are not looking at the question of network throughput, which is affected mostly by propagation delay, but rather the protocol’s ability to prevent collisions. RTS/CTS-based collision-avoidance protocols require successful detection of the hand...

In this paper, single-carrier frequency domain adaptive antenna array (SC-FDAAA) for the uplink multi-user multiple-input multiple-output (MIMO) transmission in a cellular system is studied. By employing AAAweight control in frequency domain, the base station (BS) can suppress the multi-user interference (MUI) and therefore realize multi-user SC transmission. In addition, channel frequency sele...

In this paper, a new pure-digital frequency synthesizer Fout=(X/Y)•Fin for square-waves with controlled precision is described. Given that Fin is the input reference frequency provided by a stable crystal oscillator, Fout is the synthesized frequency; X and Y are two co-prime integer numbers. The purpose is to demonstrate that with exclusively simple digital techniques, a frequency synthesizer ...

Code reuse attacks such as return oriented programming and jump oriented programming are the most popular exploitation methods among attackers. A large number of practical and non-practical defenses are proposed that differ in their overhead, the source code requirement, detection rate and implementation dependencies. However, a usual aspect among these methods is consideration of the common be...

<span>Massive multiple-input multiple-output (MIMO) improves spectrum efficiency by increasing the capacity of wireless structure. Therefore, massive MIMO is promising for fifth generation (5G) communications. In MIMO, channel estimation a crucial part that should achieve reliable performance. Pilots are sent from end-users to be used estimating channel. However, problem interference in p...