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This article investigates the problem of distributed spectrum resource allocation in the ultra-dense small cell networks, which takes the different loads of small cell base stations (SBSs) into consideration. Here, we simplify the load as the number of active users served by a SBS. We formulate the problem of load-aware channel selection as a graphical game and propose a distributed learning algorithm...
In this paper, we propose heuristic algorithms to solve an original NP-hard load equalization problem in cellular Heterogeneous Networks (HetNets). Primarily, we suggest a user association scheme applying dynamic cell range expansion (DCRE) for small cells, where a dynamic power offset is optimized and used to enhance their coverage area and thus improve network load balancing. Thereafter, we introduce...
In Heterogeneous Networks (HetNets), Almost Blank Subframe (ABS) can provide interference free communication to the Cell Range Expansion (CRE) area users. Although the CRE technique is simple and guarantees a better offloading, it might not be the best way for balancing the load. In this paper, we investigate the joint optimization of the user association and the ABS ratio computation. We propose...
Next generation tactical networks has to provide high data rate and low delay, along with multiple applications with strict QoS requirements. In this work we address the problems of clustering and frequency allocation in TDMA-based frequency-hopping tactical networks. We propose Mixed Integer Linear Programming based optimal clustering solution along with a distributively implementable load-balanced...
A virtual interferogram-generation algorithm is proposed to improve the performance of phase-shifting digital holography. Combining the intensity distribution of a signal and that of a reference beam with two observed interferograms, this algorithm generates four interferograms with different phases. Simulation results confirmed the basic operation of this algorithm.
Interference management is indispensable for dense wireless networks to improve system performance. Reduction in spatial channel overlap is one of the most effective approaches, which leads to an increase in the transmission opportunity of each access point (AP) and mitigation of channel interference at a reception point. In this paper, coverage overlap is modeled as a subset of two-dimensional Euclidean...
This paper addresses the problem of estimating the Multi-User Multiple Input Multiple Output (MU-MIMO) Channel Quality Indicator (CQI) from the reported Single-User MIMO rank-1 CQI. A hybrid MU-MIMO CQI estimation algorithm is proposed. Proposed algorithm applies a fixed back off offset to compensate the power sharing among co-scheduled users and a dynamic offset for Multi-User (MU) interference....
In security surveillance video (SSV), foreign object occlusion is increasingly common. Automatic detection of suspicious occlusion has become important. In this paper, a banner occlusion detection approach is proposed. The proposed approach first detects the banner in the image using both color feature and shape feature. More specifically, the proposed approach exploits the HSV color space to extract...
A major problem in Wireless Mesh Network is capacity decrease due to wireless interference. A wireless mesh router with multiple routers and channels is capable of reducing network interference. Static channel allocation and dynamic channel allocation are types of channel allocation. Adaptive Dynamic Channel Allocation protocol (ADCA) is dynamic channel allocation protocol which decreases the packet...
Cognitive radio technology provides a framework for flexible way to utilize the white spaces using the various spectrum sharing techniques. Interference plays an important role in communication when the channels are shared by the licensed and unlicensed users. Further, the signal to interference plus noise ratio also provide the bounds for the channel capacity. For this the authors introduce a conflict...
The dynamic TDD DL/UL configuration based on instantaneous asymmetric DL/UL traffics is an effective way to increase the radio resource utilization. However, free reconfiguration of each cell's TDD DL/UL configuration may result in significant co-channel co-subframe DL-UL interference. In this paper, we propose and evaluate a novel centralized cell clustering interference mitigation scheme for dynamic...
In the process of Multi-UAV (Unmanned Aerial Vehicles) perform the task, with the increasing of detection range, how to decrease the communication range of the UAVs group to prevent the eavesdropping of information, which is an urgent need to solve the problem of Multi-UAV secure communications. In this paper, a distributed cooperative control algorithm improved by UAVs-transmission-power-setting-based...
Heterogeneous and small cell networks (HetSNets) have emerged as a promising mean to significantly improve coverage and performance of next generation cellular networks. However, the high density of base stations in such networks accentuates the harmful impact of interference on network performance. This paper considers a network of multiple small cells where the base stations seek to maximize a common...
Femtocells are envisioned as a key solution to embrace the ever-increasing high data rate and thus are extensively deployed. Given that numerous femtocell access points (FAPs) deployed in ultra- dense networks (UDNs) lead to significant energy consumption, boosting their energy efficiency (EE) becomes an important issue to be addressed. However, most existing works either focus on homogeneous networks...
Device to Device (D2D) communication technique has been projected as means of taking the benefit of increasing performance of cellular communication with direct link between users. In this paper, we propose a dynamic intra cluster data sharing method taking advantage of D2D multicast. One of the users serves as cluster head to take turns to multicast at a particular time, selected by base station...
Enhanced Inter Cell Interference Coordination (eICIC) is a time-domain technique to achieve load balancing among macro and pico cells in heterogeneous networks (HetNets). eICIC uses two network parameters to address the interference problem: i) Cell Range Extension (CRE) to increase the coverage of pico cells; ii) Almost Blank Subframe (ABS) to reduce the interference for users in pico cells when...
By allowing simultaneous transmissions in neighbouring cells the spectral reuse and the overall throughput of a WLAN system can be increased. We have investigated the impact of varying the clear channel assessment threshold (CCAT) in different network deployments defined by IEEE 802.11ax Task Group, and we show the potential of 4 different algorithms. By increasing the CCAT value from today's legacy...
Inter-cell interference is a major challenge in multi-user multi-carrier cellular networks, especially for cells with overlapping coverage. Several subcarrier and power allocation algorithms have been developed to deal with this problem. However, they focus on maximizing data rates using only physical layer information, disregarding upper layer information like the queue backlogs. Assigning subcarriers...
We consider new Dynamic Network Architecture (DNA) which provides significant soft capacity in the network enabling a wide range of adaptations to traffic demand variations without any change in the fixed network infrastructure. To maximize the system throughput we propose a new second order cone programming (SOCP) based algorithm to optimize jointly the access point (AP) selection and the downlink...
Femtocells have emerged as a promising solution for increasing network capacity to cope with the exponential growth of mobile video traffic. However, the randomness of wireless channel and cross-tier interference may cause frequent interruption or fluctuation of video playback, which is challenging for wireless video streaming. In this paper, we consider a femtocell scalable video streaming system...
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