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In 5G cellular communication systems, a new type of simulation methodology may be required due to the emergence of new services and applications, new environments and requirements, new performance indicators, and increased need for accurate end-to-end performance measurements of systems including wired and wireless sections. In this paper, we address the characteristics of 5G simulations compared...
The compressive sensing-based random access may get impacted largely by other cell interference (OCI), which may shatter the sparsity of the received signal model unless the signature space assignment among interfering cells is carefully handled. In this paper, we investigate the performance of multi-sequence spreading-based random access (MSRA) scheme under multi-cell environment. In particular,...
In this paper, we introduce a comprehensive grant-free random access scheme for machine-type communication which is characterized by massive connectivity and low latency. The scheme presented in here is comprehensive in a sense that, synchronization, channel estimation, and users identification & data detection (multi-user detection) are performed all in a single shot. The scheme employs compressive...
Synchronization, channel estimation, and multi- user detection (MUD) can be performed in a single shot for a comprehensive grant-free access [1]. The scheme employs compressive sensing by exploiting two sparse phenomena: sparsity in users' activity and sparsity in channel delay spread. The performance of compressive sensing based schemes should be thoroughly studied in a multi-cell environment as...
This paper presents a novel multi-input multi-output (MIMO) multicast and broadcast scheme for scalable video coding (SVC)-based transmission in the mobile system. This scheme provides differentiated video quality, that depends on the channel quality of the individual user, by employing different modulation and coding schemes (MCSs) for unequal error protection (UEP) of individual layers. Matching...
One of the main requirements in the next generation wireless and mobile communication system is supporting a huge number of machine type communication (MTC) devices efficiently. MTC devices may be placed in indoor or underground environments, where the signal is hard to reach. In order to maintain a proper communication range, devices with bad channel conditions may use very low data rates using data...
In this paper, we present a scheme to overlay machine-to-machine (M2M) traffic over human-to-human (H2H) communication under an orthogonal frequency division multiple access (OFDMA) framework. An intermittent short burst of M2M traffic is considered with a massive number of devices attempting to access the network. The proposed scheme solves the random access channel (RACH) congestion problem by allowing...
According to the conditions proposed by Donalson which should be satisfied for the numerical turbulence models, a non-linear composition of vorticity tensor which is symmetrical and whose trace is zero is added to the constitutive relation between Reynolds stresses and time-averaged quantities of flow field. Then, a new constitutive equation of Reynolds stress is given by $$ - \rho \overline {u_i...
Listen-Before-Talk (LBT) protocol is an essential mechanism that allows Wi-Fi and LTE systems to share the unlicensed band while maintaining the performance of each individual system. However, a conventional LBT mechanism in this coexisting environment operates with the fixed channel occupancy time (COT) even under the varying traffic load in each system. In practice, if COT is set too short or large,...
In this paper, we present a new structure for compressive sensing(CS)-based random access (RA) scheme for machine-type communications (MTC). In the proposed scheme, we consider a one-shot transmission in which users transmit their packets right away by spreading them with multiple spreading sequences (MS) over a frame without waiting for scheduling grant from the base station. The scheme is designed...
This paper presents a compressive sensing (CS)-based one-shot random access (RA) scheme for massive and delay-intolerant machine-type communication (MTC). Furthermore, an iterative order recursive least square (IORLS)-based orthogonal matching pursuit (OMP) decoding algorithm is employed for high accuracy and low decoding complexity. By employing IORLS, it has been shown that near oracle detection,...
This paper describes a novel micro electrical impedance spectroscopy (μEIS) device with cell traps, which can discriminate between normal and cancerous human urothelial cells. Three-dimensional traps with electrodes were employed for effective capture of target cells. This allows cells to be automatically captured, while the electrodes on the slanted area of the trap accurately characterize the electrical...
We propose a liquid-based electrostatic energy harvester that uses ferrofluid droplets. The proposed device consists of top and bottom plates with conducting electrodes coated with a solid dielectric layer, a conducting liquid, and oil-based ferrofluid droplets. Using an external magnetic field, we experimentally verified the surfaces on which the ferrofluid actuates well. In addition, we investigated...
An EoN (Electrical impedance spectroscopy-On-a-Needle) with bipolar interdigitated electrodes at the very end of a hypodermic needle has been introduced. The device can be utilized to analyze the electrical impedance of biotissues for the purpose of discriminating between tissues prior to biopsy. A flexible photomask and photoresist spray coating were employed in the lithography process to realize...
In this paper, we present the mathematical analysis of discovery performance in device-to-device (D2D) communication system. As opposed to the previous work which deals with outdoor devices only, we consider a non-homogeneous environment in which both indoor and outdoor devices exist with the different intensities and channel characteristics. A stochastic geometry model with various system parameters,...
While maintaining a quality of cellular link subject to underlay device-to-device (D2D) communication in the cellular system, it obvious that a performance of proximity-based service over D2D link would be varying with the location of its transmitter. We consider an open-loop fractional power control for the uplink cellular link while limiting the transmit power of D2D link so as to protect the cellular...
Since mobile traffic has been increased tremendously due to popularization of high-end mobile devices, many mobile carriers and smartphone manufacturers have put their best effort on solving the capacity problem. Small cell is introduced as an idea for the solution, and various mobile carriers have installed small cells to provide more bandwidth to areas that have too much traffic to be handled by...
As compared to asynchronous contention-based random access, synchronous & distributed link scheduling for OFDM system turns to be a viable solution to improve the system throughput for device-to-device (D2D) communication. In particular, a spatial spectral efficiency can be improved by scheduling the concurrent D2D links as many as the individual signal-to-interference ratio (SIR) requirement...
We consider a mobile content delivery network (mCDN) in which a special form of mobile devices designated as caching servers (caching-server device: CSD) can provide the near-by devices with some popular contents on demand via device-to-device (D2D) communication links. On the assumption that mobile CSDs are randomly distributed by a Poisson point process (PPP), an optimization problem is formulated...
By investigating the technical issues in the existing cell selection and scheduling scheme under some of carrier aggregation (CA) deployment scenarios discussed in LTE-Advanced system, we propose a distributed inter-cell cooperation scheme for joint scheduling that can improve the average system throughput when 6 different sectors are formed by deploying the sector antennas for each component carrier...
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