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In this paper, we propose, design, and evaluate the use of transmitters mapping with a symbols encoding techniques to mitigate inter-symbol interference (ISI) and improve the overall VLC system performance while using a very simple receiver (single element wide field of view, (FOV)) with an OOK modulation scheme. The proposed technique with the laser diodes transmitters are able to provide data rates...
Coflow scheduling without prior knowledge has been proposed recently. However, the previous solution, Aalo, has two problems: it does not explicitly control the flow rate; it assumes the network is ideally non-blocking (with perfect traffic balancing and no oversubscription). In this paper, we show the performance loss caused by the above two problems. We propose EAalo to cope with the problems. It...
Many online application services are now provided by cloud-deployed VM clusters. Although economical, VMs in the cloud are prone to interference due to contention for physical resources among colocated users. Worse, this interference is dynamic and unpredictable. Current provider-centric solutions are application-oblivious and are thus not always aware of the user's SLO requirements or application...
Fifth generation (5G) cellular networks would include millimeter wave (mmWave) for communication which gains the advantage of extensive frequency reuse and directive propagation. The recent trends in device-to-device (D2D) communication have escalated the importance of proximity based services for next generation cellular systems. The integration of mmWave and D2D technology will improve the performance...
In this paper, we investigate rate adaptive radio resource allocation in visible light communication systems (VLC), to maximize the total output data rate. The proposed allocation algorithm assigns power and subcarriers to each user based on its downlink channel gain and rate constraint, while satisfying the total power constraint. The performance of the proposed algorithm on multi cell VLC systems...
Memory interference is a critical impediment to system performance in CMP systems. To address this problem, we first propose a Dynamically Proportional Bandwidth Throttling policy (DPBT), which dynamically throttles back memory-intensive applications based on their memory access behavior. DPBT achieves a more balance memory bandwidth partitioning. Moreover, we improve the previous memory channel partitioning...
We consider a hybrid model of wireless networks, where nodes are able to communicate with each other and a base station as well. We use a coalitional approach for modelling the communication structures and to describe the resulting SINR values and bandwidths. We provide a framework which assumes two frequencies; one for direct communication with the base station and one for internal communication...
A reliable feedback channel is vital to report decoding acknowledgments in retransmission mechanisms such as the hybrid automatic repeat request (HARQ). While the feedback bits are known to be costly for the wireless link, a feedback message more informative than the conventional single-bit feedback can increase resource utilization efficiency. Considering the practical limitations for increasing...
Recently, the concept of heterogeneous networks (HetNets) has been proposed as an alternative solution to provide higher coverage and capacity for cellular networks. In HetNets concept, many of small base stations (SBSs) are employed in the existing cell of macro base stations (MBSs) to increase the coverage and system capacity. However, the employment of many SBSs in the existing macro cells would...
Non-Orthogonal Multiple Access (NOMA) for a multi-user single- input single-output (SISO) setup is studied in the power and the frequency domains simultaneously. The problem of sum-bandwidth minimization under perfect channel state information is solved for various combinations of rate requirements and user pairings. In this process, an iterative Tabu-search based algorithm is applied to avoid an...
Due to the large swath of available bandwidth, millimeter wave (mmWave) spectrum is potentially suitable to meet enhanced network capacity requirements of future generation communication systems. However, the high Analog to Digital Converter (ADC) sampling rate required to process wide band signals in the mmWave regime results in significant power consumption in the receiver hardware. In this work,...
Device-to-Device (D2D) communication is one of the technologies for next generation communication system. Unlike traditional cellular network, D2D allows proximity users to communicate directly with each other without routing the data through a base station. In this paper, we propose a resource allocation scheme for energy efficiency (EE) optimization in cellular network with overlaying D2D communication...
It is expected that future cellular networks will be densely deployed with both macro cells and small cells to meet the ever-increasing traffic demand, and a cost-effective and reliable backhaul connectivity will be essential to such deployment scenarios. As wired backhaul solutions may not be always practical or feasible, in this paper we consider wireless in-band backhaul for a network with macro...
Machine-type communications (MTC), considered as one of potential technologies in 5G, has attracted more and more attention in recent years. Massive MTC connection density but with small data rate leads to preamble deficiency and network congestion in the network. In order to solve this problem, we jointly utilize the back off strategy and the hierarchical access control method. We formulate a Quality...
Indoor positioning for visible light communication (VLC) has gained significant attentions recently with the popularity of light-emitting diodes (LEDs). In this paper, we consider a typical application of VLC by proposing a three-dimensional positioning scheme for a target terminal equipped with multiple photodiodes (PDs). Given the relative coordinates between the target terminal and receiving PDs...
The integration of radar and communication has attracted general interest with its advantage of equipment miniaturizing and high efficiency of spectrum, especially in intelligent transportation systems because of the need for transmitting and detecting simultaneously and the lack of room for various devices. Among various integration schemes, the integrated waveform which realizes transmitting and...
We investigate the overlay coding scheme as the capacity achieving multi user detection (MUD) technique, i.e., transmitting over non-orthogonal channels, in forward link in multi-beam satellite systems with dense frequency reuse. The classic overlay coding scheme, uses the strongest co- channel interference (CCI) as extra source of information. The data intended for the target user is shared between...
The cellular data traffic has been dramatically increased, a typical approach is considering the operation of the Long Term Evolution (LTE) system in the unlicensed spectrum. Although there are a large number of theoretical researches on LTE-U, field trial results are still lacking. In this paper, we build a real time field trial in 5.8GHz unlicensed bands. The typical indoor scenario is deployed...
Joint allocation of spectrum and user association is considered for a large cellular network. The objective is to optimize a network utility function such as average delay given traffic statistics collected over a slow timescale. A key challenge is scalability: given n access points (APs), there are O(2n) ways in which the APs can share the spectrum. The number of variables is reduced from O(2n) to...
This paper considers a K-cell multiple access channel with inter-symbol interference (ISI). The primary finding of this paper is that, without instantaneous channel state information at a transmitter, the interference-free sum degrees of freedom of K is asymptotically achievable when the number of users per cell is sufficiently large, and also when the number of channel-impulse-response taps of desired...
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