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This paper aims to evaluate the system level performance of the newly proposed non-orthogonal multiple access scheme sparse code multiple access (SCMA) with uplink grant-free transmissions for 5G massive machine-type communication (mMTC) scenario. The challenge lies in the modeling and abstraction of physical layer actions as the link-to-system interface, including the features of overloading, grant-free...
Full-duplex (FD) networks promise nearly doubled spectrum efficiency for single links with beyond 100 dB self-interference cancellation capability. However, the performance of FD networking is not that straightforward, as there will be several new types of interference introduced. Hence, it is critical to exploit some radio resource management techniques to combat the annoying interference and inevitably...
East and West Africa are currently the regions with the fastest economic development growth in Africa. In this article, East and West African major ports efficiency over time are measured and analyzed using the Data Envelopment Analysis (DEA) Window Analysis. A comparison of port efficiency between East and West African ports is then made based on the results found. The Container throughput, the total...
Android has provided dynamic code loading (DCL) since API level one. DCL allows an app developer to load additional code at runtime. DCL raises numerous challenges with regards to security and accountability analysis of apps. While previous studies have investigated DCL on Android, in this paper we formulate and answer three critical questions that are missing from previous studies: (1) Where does...
Ivory Coast's ports are ports that currently have a part landlord, part public service port management model. This combination of a landlord port management model and of a public service port management model faces many controversies. In this article, the port governance in Ivory Coast is analyzed since the foundation of its two ports until today and the development of its ports since their creation...
In In-band Full-duplex (IBFD) wireless networks, the RTS/CTS mechanism is unable to establish an asymmetric dual link and to recognize the transmission mode of communication nodes to capture more opportunities of IBFD transmission, which limits total network throughput. In this paper, we propose a novel distributed IBFD MAC mechanism to establish symmetric/asymmetric dual link in wireless networks...
The boost switching power converter is a kind of voltage switching device which is widely used in all kinds of power equipment. Compared with the traditional winding transformer, high conversion efficiency and easy to large-scale integration are the advantages of high frequency boost converter. However, the high frequency boost converters are likely to generate the intermittent phenomena because of...
In this paper, we define the interval-valued intuitionistic hesitant fuzzy Quasi-Choquet geometric (IVIHFQCG) operators, then some desirable properties are proposed. Then we show the family of IVIHFQCG operators. Further, the compromise ratio method, the extended Euclidean distance and the extended technique for order preference by similarity to ideal solution (TOPSIS) method are used for these interval-valued...
Due to radio-frequency (RF) circuit mismatch, the channel reciprocity of time-division duplex massive multiple-input multiple-output system is impaired. Under this condition, there exist several different approaches for base station (BS) to obtain the downlink (DL) channel estimate based on the minimum mean-square-error (MMSE) estimation method. We show that with the RF mismatch parameters BS will...
This paper discusses a new method of estimating vehicle lateral stability region, which is an important way to describe the vehicle safe or stable lateral operation capability. Benefited from the introduced local linearization method, a realistic 2D LuGre tire model can be applied to describe the coupled and nonlinear longitudinal and lateral friction forces for the stability region estimation. Compared...
To overcome the hidden terminal problem a secondary user (SU) may encounter, cooperative spectrum sensing (CSS) is proposed and gained much attention in the last decades. However, due to the selfish nature, SUs may not cooperate unconditionally as most previous works have assumed. Therefore, how to stimulate SUs to play cooperatively is an important issue. In this paper, we propose a reputation-based...
This paper presents a novel active yaw stabilizer (AYS) based on an in-wheel motor control system. Locating a controlled in-wheel motor system in the common spare tire location of a sedan vehicle, the introduced AYS is realized by moving the controlled in-wheel motor along a designed orbit. Through controlling two torques commanded for the self-rotation of the in-wheel motor and the movement along...
This paper develops and utilizes an optimization based framework to investigate the maximal energy efficiency potentially attainable by HVAC system operation in a non-predictive context. Performance is evaluated relative to the existing state of the art set-point reset strategies. The expected efficiency increase driven by operation constraints relaxations is evaluated.
A monocular visual odometry using straight-line constrained optical flow was proposed to estimate the robotic ego-motion. The straight-line constrained optical flow was defined by decomposing the motion of a line segment in image plane into a rotation and two directional translations. The parameters of optical flow are similar to robot motion, so we can estimate the motion by combining the camera...
Big date technology plays an important role in intelligent safety supervision. Based on overall framework of safety supervision big date platform, this issue demonstrates the process from the source to the end-user and the safety supervision big data application architecture. The data integration, analysis, processing and display technologies were analyzed to meet the requirements of intelligent safety...
In the big data era, it is vital to allocate the vast amount of data to various users efficiently. However, the data agents (data owners, collectors and users) are selfish and seek to maximize their own utilities instead of the overall system efficiency. In this paper, the data trading problem of a data market with multiple data owners, collectors and users is formulated and an iterative auction mechanism...
In this work, we propose a novel wireless time-reversal indoor events detection system (TRIEDS). By leveraging the time-reversal (TR) technique to capture the changes of channel state information (CSI) in the indoor environment, TRIEDS enables low-complexity single-antenna devices that operate in the ISM band to perform through-the-wall multiple events detection. In TRIEDS, each indoor event is detected...
MapReduce greatly alleviates the burdens of programmers and gradually becomes an application programming standard on cloud computing nowadays, because the run-time system of cloud computing can automatically handle the issues of paralleled and distributed programming on behalf of programmers at run time. Although MapReduce can strongly benefit programmers on developing cloud computing applications,...
Sparse code multiple access (SCMA) scheme is considered to be one promising non-orthogonal multiple access technology for the future fifth generation (5G) communications. Due to the sparse nature, message passing algorithm (MPA) has been used at the receiver to achieve close to maximum likelihood (ML) detection performance with much lower complexity. However, the complexity order of MPA is still exponential...
Internet has witnessed its paramount function transition from host-to-host communication to content dissemination. Named Data Networking (NDN) and Content-Centric Networking (CCN) emerge as a clean slate network architecture to embrace this shift. Pending Interest Table (PIT) in NDN/CCN keeps track of the Interest packets that are received but yet un-responded, which brings NDN/CCN significant features,...
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