The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Network lifetime is of great importance in WBANs that significantly influences the network performance and user experience. Among all the solutions to extend the network lifetime, relay mechanism plays a crucial role. However, previous works only concentrate on energy efficiency of sensor nodes regardless of energy storage diversity among sensor nodes, which may severely limit the performance of enhancing...
Geometry-based stochastic model (GBSM) of multiple input multiple output (MIMO) channel describes the channel impulse response (CIR) in the sense of rays and clusters, which obey the empirical distributions. Thus, the correlation between MIMO sub-channels is not explicitly defined, which makes it difficult for GBSM to predict channel capacity accurately. Facing the increased antenna number of massive...
In this paper, we propose a novel visible light communications (VLC) system that can both achieves good performance in data transmission and environment perception. To be specific, based on the traditional VLC system, we develop a cooperative VLC scheme derived from the idea of clouding computing and machine learning. Afterwards, measurement for data transmission and algorithms for environment perception...
Geometry-based localization algorithms come to the forefront with its unique superiority. This paper proposes a Delaunay triangulation based localization scheme (DBLS), which takes use of received signal strength indicator(RSSI) from anchor nodes. Based on RSSI, the Delaunay area is generated. The unknown node determines which Delaunay area it belongs to and then record it down. After several iteration,...
This paper investigates the energy efficient resource allocation for OFDM relay networks, where K users receive information via L helping relays. For such a system, an optimization problem is formulated to maximize the system energy efficiency (EE) by jointly optimizing the relay selection, subcarriers assignment and power allocation under the proportional rate constraints and available power constraint...
With the rapid development of the internet of things, location information becomes increasingly important for various applications. However, the localization information of network devices are vulnerable to various attacks. In this paper, we propose SPIN, a scheme for location verification that allows the access point (AP) to verify credibility of a reported location from a network node. This is achieved...
As the rapid growth of the data traffic, the mobile cellular network is under unprecedented operation pressure. Various of small cells with relay technologies have been proposed to bypass increased data with the status of the limited base station so far. Therefore, vehicular small cell gradually are attracting the attention of the researchers. In this paper, we discuss the communication model of the...
In this paper, we consider a multiple-input-multiple-output optical wireless communication (MIMO-OWC) system suffering from log-normal fading. In this scenario, a general criterion for the design of full large-scale diversity space code (FLDSC) with the maximum likelihood (ML) detector is developed. Based on our criterion, FLDSC is attained if and only if all the entries of the space coding matrix...
Network coding (NC) is a promising method used to achieve the channel capacity and enhance the reliability of multicast networks. However, the general wireless multicast networks based on NC are facing big problems such as long delays and large computational complexities. We propose a multicast network based on Batched sparse (BATS) codes which can efficiently solve these problems. Since fountain...
Although the Wireless Sensor and Actuator Networks (WSANs) have many advantages than the wired networks, the nature of sharing wireless media and the complicated behavior of Media Access Control (MAC) introduce adverse impacts on the control system. In contrast to most work on networked control systems using simplified models of network induced delays, this paper considers the study the random access...
Falls in elderly is a major health problem and a cost burden to social services. Thus automatic fall detectors are needed to support the independence and security of the elderly. The goal of this research is to develop a real-time portable wireless fall detection system, which is capable of automatically discriminating between falls and Activities of Daily Life (ADL). The fall detection system contains...
In this paper we study the problem of relay-enhanced cell (REC) coverage for which relay location is optimized to maximize the achievable REC radius. The problem is investigated for both Rayleigh and Rician relay fading channels, under a pre-determined user's outage probability constraint. We propose a statistical approach to formulate the problem and develop an optimization algorithm for it. The...
Recently, Wireless Sensor Networks (WSNs) begin to use the solar energy. But the energy from the environment is usually unstable, An efficient solar prediction algorithm should be studied. In this paper, a novel solar energy prediction algorithm, namely Weather-Conditioned Selective Moving Average (WCSMA), is proposed by using the trend similarity of energy harvesting and the classification of sunny...
This paper designs a wireless data Transceiver by using nRF905, DS18B20 and STC12C5410AD. Through I/V converter,the Transceiver can receive the standard 4-20mA current signals exported by transmitter. So the wireless data transceiver has certain universal. The furnace temperature Wireless Data Acquisition System is designed by describing the hardware circuit and data sending/ receiving flow. The system...
The thesis focuses on the design and realization of the wireless temperature-test system set Nrf9e5 as a front-end and computer as a background. The system can collect ambient temperature timely, display it by the way of graphics on the computer and store a certain amount of temperature data. In addition, the design can combine watchdog monitoring circuit with the lower power consumption, lowering...
This paper presents an innovative 60 GHz substrate integrated transceiver system with a broad bandwidth up to 3 GHz. To validate the proposed substrate integrated circuits (SICs) scheme, a 60 GHz wireless communication system with modulated signals is successfully demonstrated for line-of-sight (LOS) channels. The proposed integration technique of planar and non-planar structures allows the design...
In this paper, we consider blind interference suppression in IR UWB communication system, and the means of a statistical technique called independent component analysis (ICA), taken as a solution for the coexistence of impulse-radio Ultra-wideband (IR-UWB) systems with other wireless systems was studied. Particularly for the evaluation of the system performance, tone, multiton, and partial-band interference...
Relay selection and subchannel pairing are important issues in OFDM based cooperative wireless systems to improve the system performance and reliability. Most of the relay selection schemes in modern literatures are centralized under the assumption that the overall channel condition is known at the source node, each relay node and the destination node which is impractical. In this paper, we will propose...
In this paper, we propose a novel modeling method of indoor broadband fixed wireless access (BFWA) MIMO Ricean channel based on empirical results obtained from stationary channel measurement at 4.9 GHz in both indoor line of sight (LOS) and non-LOS (NLOS) scenarios. The phenomena that K-factors decay versus delay linearly in both the LOS and NLOS scenarios are reported. Extended Saleh-Valenzuela cluster...
In this paper, we address the problem of joint packet scheduling at the application layer as well as power and rate allocation at the physical layer for delay-sensitive video streaming over slow-varying flat-fading wireless channels. Our goal is to find the optimal cross-layer policy that maximizes the cumulative received video quality, while minimizing the total transmission energy. We first formulate...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.