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We introduce the fast digital algorithms for the coherent demodulation of binary and four position differential phase-shift keyed signals. These algorithms can be practically implemented with the minimum number of simple arithmetic operations over the input signal period and they are is fully compatible with the modern hardware components available. We obtain the timing diagrams of the demodulators...
In case of the decision of the task of design of automated control systems for crucial objects, a minimum possible level of risks at uncontrollable interference in the processes of functioning of these systems, and also minimization of negative consequences from a similar interference in the course of its operation are required. In connection with this, on the basis of the system theory of conflict...
The Phantom cell concept is a solution for high-traffic outdoor environments that can also support good mobility and connectivity in ultra-dense network. In a phantom cells network, a centralized Macrocell controls all phantom cells within its coverage area and the C-Plane and U-Plane are split. Many issues need to be addressed for this architecture including radio resources allocation and cross/co...
Interference alignment (IA) is an efficient interference management technique that can result in sum-rates that scale linearly with the number of users at high signal-to-noise power ratio (SNR). But it is difficult to directly apply IA to large networks because of heavy signaling overhead and feasibility constraint. Clustered IA divides cells into disjoint clusters where IA is applied in each cluster...
Ultra-dense network (UDN) is expected to be the main means of meeting the mobile traffic demands in 5G. Small cell is the main load of UDN to save energy and enhance coverage. However, the resource conflict become much more complicated than the conventional cellular system, because of the dense and random deployment and the dynamical switch of small cells, and the changeable users. Therefore, this...
Aiming at the problem that the dynamic arrival of the virtual network requests in the wireless network environment leads to the unbalanced allocation of the substrate network resources and the low acceptance rate of the subsequent requests, a topology-aware wireless virtual network embedding algorithm (WVNEA-TA) is proposed. By analyzing the dynamic topological attributes of the virtual network and...
Recently multi-agent patrolling became more and more crucial in security, monitoring, etc. applications. It can be used, for example, to monitor points of interest in space, such as measurement points or entrances to a guarded area. A good patrolling strategy would ensure frequent visits to all points of interest defined by a user. A variety of centralized and distributed approaches exist already...
This work investigates the downlink resource allocation (RA) problem in orthogonal frequency division multiplexing (OFDM)-based cognitive radio networks. The objective of this work is to develop a fair RA-algorithm that maximizes the capacity of secondary users (SUs) and in the same time limits the interference caused to the primary users. The fairness condition is formulated as a minimal data condition...
An optical network, like any system, has to be observable before it can become subject to optimization. This is the main capability that the ORCHESTRA project introduces. ORCHESTRA's high observability relies on information provided by the coherent transceivers that can be extended, almost for free, to operate as software defined optical performance monitors (soft-OPM). Monitoring information is processed...
Cloud storage services are associated with high latency variance, and degraded throughput which is problematic when users are fetching and storing content for interactive applications. This can be attributed to performance hotspots created by slow nodes in a storage cluster, and performance interference caused by multi-tenancy, and background tasks such as data scrubbing, backfilling, recovery, etc...
Conventional planning and optimization of cellular networks for supporting the peak-time user demand leads to substantial wastage of electrical energy. Therefore, we propose an energy-aware dynamic network provisioning framework for realizing green mobile cellular systems by reducing energy consumption in access networks. Proposed mechanism allows base stations (BSs) to offload their entire traffic...
In this paper, the problem of joint dynamic spectrum access and multi-relay selection is investigated in relayenabled cooperative communication systems to maximize the system sum-capacity. Since the considered problem is a mixed integer nonlinear program, which is generally intractable to find the optimal solution, two matching theory-based suboptimal algorithms are proposed to reduce the computational...
Cloud radio access network (C-RAN) is deemed as a promising architecture to meet the exponentially increasing traffic demand in mobile networks, where baseband processing is separated from remote radio heads (RRHs) and performed in a centralized baseband unit (BBU) pool. However, the densely deployed RRHs, as well as the passive optical network which provides high capacity backhauls between the RRHs...
With increasing demand for wireless connectivity, IEEE 802.11 WLANs have become ubiquitous and continue to grow in number. This leads to high density of basic service sets with the significant co-channel interference (CCI) among them. This paper sheds light on the CCI caused by 802.11 MAC ACK frames, which has been less studied than the CCI caused by data frames. Based on stochastic geometry analysis,...
Next generation (5G) mobile communication systems has a goal of ultra-high peak data rate. Ultra-Dense Network (UDN) is viewed as one of the key technologies to meet this challenge. The trend of network densification brings more complex interference. To solve this problem, a novel user-centric virtual cell design is proposed. Considering the changes of virtual cell load, we propose a load-aware virtual...
This paper focuses on interference coordination between the small cell and macro cell tiers of a wireless access network. We propose a new perspective based on a modelfree learning strategy, not requiring any previous knowledge about the network (e.g., topology, interference graph, scheduling algorithms). Our approach is based on a stochastic optimization algorithm known as Response Surface Methodology,...
This paper studies user-centric cluster scheme in cloud radio access network (Cloud-RAN), where distributed Radio Remote Heads (RRHs) are connected to a centralized Based Band Units (BBUs) pool and all baseband processing is performed via high-bandwidth low-latency backhaul network. In user-centric cluster scheme, BBU schedules multiple RRHs for each user to form the serving cluster, and then BBU...
This paper investigates a cellular edge caching design under an extremely large number of small base stations (SBSs) and users. In this ultra-dense edge caching network (UDCN), SBS-user distances shrink, and each user can request a cached content from multiple SBSs. Unfortunately, the complexity of existing caching controls' mechanisms increases with the number of SBSs, making them inapphcable for...
The dynamic spectrum access, as one of the core technologies of Cognitive Radio (CR) system is an important step for users to realize the utilization of idle spectrum resources. To solve the problem of multi-user dynamic spectrum access in CR system, a dynamic spectrum access algorithm is proposed based on improved color sensitive graph coloring model. In this algorithm, the cognitive user power matrix...
Dynamic behavior is an essential part of wireless networking, due mobility, environmental changes or failures. We analyze a natural exponential backoff procedure to manage contention in a fading channel, in the presence of both node churn and link changes. We show that it attains a fast convergence, stabilizing contention from any state in logarithmic time. We use it to obtain optimal algorithm for...
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