This paper discusses the possibility of deploying a shortrange cognitive radio (secondary communication system) within the service area of a primary system. Although the secondary system interferes with the primary system, there are certain locations in the service area of the primary system where the cognitive radio can reuse the frequency of the primary system without causing harmful interfer...

In this paper, we propose an efficient mobility control algorithm for the downlink multi-cell orthogonal frequency division multiplexing access (OFDMA) system for co-channel interference reduction. It divides each cell into several areas. The mobile nodes in each area find their own optimal position according to their present location. Both the signal to interference plus noise ratio (SINR) and...

In previous work, we presented a novel Channel Alternation and Rotation (CAR) scheme that coordinates channel assignment with antenna directivities. In CAR, each cell type is allocated an extra channel set that provides network designer the flexibility to alternate and rotate channels according to nearest front lobe interference avoidant strategy to enhance co-channel interference ratio (C/I). ...

Fractional Frequency Reuse techniques can be employed to address interference in mobile networks, improving throughput for edge users. There is a tradeoff between the coverage and overall throughput achievable, as interference avoidance techniques lead to a loss in a cell’s overall throughput, with spectrum efficiency decreasing with the fencing off of orthogonal resources. In this paper we pro...

Long Term Evolution Advanced (LTE-A) technology is considered as the most possible candidate for next generation mobile communications. LTE-A networks offer high capacity and are specified and designed to accommodate small, high performance, power-efficient end-user devices. Similarly to its predecessor LTE, LTE-A incorporates inter-cell interference mitigation methods in order to mitigate inte...

The Fractional Frequency Reuse (FFR) scheme combines the benefits of universal Frequency Reuse and Frequency Reuse Factor (FRF)3. Universal Frequency Reuse scheme has high spectral efficiency while FRF=3 scheme is normally used to mitigate Intercell Interference (ICI) in a cellular system. Nevertheless, the advancement of the wireless technology does not stop here. The trend of Long Term Evolut...

In this paper, we present an analytical solution to carry out performance analysis of various frequency reuse schemes in an OFDMA based cellular network. We study the performance in downlink in terms of signal to interference (SIR) ratio and total cell data rate. The latter is analyzed keeping in view three different scheduling schemes: equal data rate, equal bandwidth and opportunist. Analytic...

code reuse attacks such as return oriented programming and jump oriented programming become the most popular exploitation methods among attackers. a large number of practical and non-practical defenses have been proposed that differ in their overhead, the source code requirement, detection rate and implementation dependencies. however, a usual aspect among them is to consider the common behavio...

In DS-CDMA cellular communications systems, the single frequency reuse can be utilized. Since large other-cell interference is produced, the well known soft handover or site diversity must be used. If the single frequency reuse is not utilized to avoid the other-cell interference, we will face the frequency allocation problem, similar to FDMA systems. In this paper, a DS-CDMA cellular system us...