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We discuss the advantages of using a vector delay/frequency-locked loop (VDFLL) architecture for GNSS receivers operating in scenarios disturbed by radio-frequency interference. Narrowband (sinusoidal) and wideband (chirp) interference signals are considered in the analysis. The VDFLL is constituted by a bank of code and frequency discriminators feeding a central extended Kalman filter that estimates...
Despite that network capacity can increase with cell densification, interferences from adjacent cells may deteriorate the throughput of users close to cell edges. To alleviate this problem and to offer a service quality with no significant cell edge degradation, we propose a feasible coordinated multi-point (CoMP) transmission architecture from a new look on antenna allocation in dense small cell...
Image frequencies and in-band interferences degrade the system performance by masking the desired down-converted signal and therefore rendering a radio receiver inoperable. This paper, elucidates an architecture for improved image rejection and interference mitigation which are critical in Cognitive Radio (CR) architectures. Many attempts have been made to mitigate these interferences in a CR receiver...
This paper proposes a novel polarization-based underlay spectrum sharing scheme in cognitive heterogeneous cellular network (CHCN). Distinguished from traditional spectrum sharing exploiting spectrum opportunities in time, frequency, space and power domains, we exploit spectrum opportunities in polarization domain to enable small cell to coexist with macrocell. The proposed scheme optimizes the transmitting...
This work considers the joint problem of content placement and service scheduling in femtocell caching networks, to maximize the traffic volume served from the cache. The problem is modeled as a Markov decision process. We combine the Edmonds-Karp algorithm and the marginal allocation algorithm to develop an efficient centralized policy called Infinite CAche-filling (ICA), which can get arbitrarily...
Although Fractional Frequency Reuse (FFR) is a good solution for Inter-Cell Interference (ICI) problem, combined FFR and beamforming can be utilized for more improved cellular system performance. In this paper, we consider a hexagonal cellular network, where we derive the Downlink (DL) worst case Signal to Interference Ratio (SIR) closed form formula for three different beamforming techniques (horizontal,...
The demand for real-time data in a modern battlefield is increasing exponentially. As a result, current military network paradigms and architectures are struggling to cope with increasing capacity demands at the tactical edge. Unfortunately, rescaling existing network architectures will not be a permanent solution to the problem. Therefore, in this paper, we propose a 3- tiered Software Defined Networking...
The notion of Total Interference Degree (TID) is traditionally used to estimate the intensity of prevalent interference in a Multi-Radio Multi-Channel Wireless Mesh Network (MRMC WMN). Numerous Channel Assignment (CA) approaches, link-scheduling algorithms and routing schemes have been proposed for WMNs which rely entirely on the concept of TID estimates. They focus on minimizing TID to create a minimal...
Today's wireless environment is very dense to support enhanced performance, which is become heterogeneous in cell, applications, services, standards and technologies. This dense deployment of heterogeneous cells has a large impact on the power consumption of network. Thus, issue of energy efficiency need to be considered in perspective of deploy of several base station (BS) in the area. In 5G standard,...
Research on network slicing for multi-tenant heterogeneous cloud radio access networks (H-CRANs) is still in its infancy. In this paper, we redefine network slicing and propose a new network slicing framework for multi-tenant H-CRANs. In particular, the network slicing process is formulated as a weighted throughput maximization problem that involves sharing of computational resources, fronthaul capacity,...
Power allocation in small cell networks has mostly been investigated using ideal communication links, where it is generally assumed that information can be relayed perfectly between base stations. In this paper, we propose a model with non-ideal links and a power adjustment algorithm for heterogeneous networks. Contrary to the power allocation approaches in the literature, channel state information...
Heterogeneous networks (HetNets) are considered a key enabling technology to provide high capacity for next generation, also known as fifth generation (5G), networks. However, in order to efficiently exploit the advantages of HetNets and strive towards high network efficiency, efficient user equipment (UE) association is decisive for targeting network performance goals. Therefore, in this work, user...
Small cell deployments are one of the most significant long-term strategic policies of the mobile network operators since small cell architecture delivers not only the required capacity boost but also the flexibility important for immensely-localized deployments in high-traffic environments. In HetNets, small cells serve as offloading spots in the radio access network to offload users and their associated...
The development on the underwater communication network for sea observation is on the rise due to increasing importance of its applications such as oceanography, marine commercial operation and military surveillance. In this paper, we design the system-level simulator (SLS) architecture for the underwater acoustic communications which can be the basis for the design model of future application-specific...
To tackle the challenge of surging data rate demand, heterogeneous network (HetNet) composed of multiple radio access technologies (RATs) has been proposed as one promising solution. In addition, the LTE and WLAN Aggregation (LWA) architecture was specified recently, but few existing network selection algorithm takes consideration on the cooperation between RATs. In this paper, we propose new Aggregation...
Extensive deployment of heterogeneous small cells over existing macrocell cellular networks forms the Ultra-dense Small cell Network (USN). USN has emerged as a key networking architecture in 5G wireless networks. It can improve network coverage and boost system capacity. However, the dense overlapped deployment of small cells leads to a complex interference problem. In this paper, we jointly implement...
The ongoing trend to integrate multiple functions with different criticalities on a single platform calls for a robust on-chip communication infrastructure in which subsystems of different criticalities can coexist and interact. A fundamental prerequisite for such a platform is to eliminate any interference between safety-critical functions and non safety-critical ones. Furthermore, as mixed-criticality...
The demand for increasingly challenging data rates in cellular networks has motivated the pursuit to exploit abundant bandwidth at the millimeter waves (mmWave) spectrum, which offers large bandwidths and near free-space path loss for line of sight links. However, this solution comes at the cost of limited communication range. Thus, mmWave basestations (BS) are expected to be densely deployed to maximize...
This work proposes a method to optimize the resource block allocation in the cloud radio access network for a long term evolution system. This approach consists in three steps. First, the baseband unit collects the required information about users. Then, it optimizes the resource block allocation by carrying out a genetic algorithm. After that, it sends the solution to the remote heads. The simulations...
Blind Interference Alignment (BIA) can greatly improve channel capacity through simultaneous transmitting multiple encoded data streams (EDSs), but can also result in low power efficiency, especially in the multi-network scenario. To address such problem, this paper takes the first step in this direction and presents paired-user BIA in a two-cell network, where users form pairs performing BIA improving...
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