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.
In this paper, we consider secure transmission for the full duplex relay network. Aiming to improve the physical layer security, we propose a full duplex hybrid relaying-and-jamming (FDHRJ) scheme. In the FDHRJ scheme, we design a pre-coding matrix to form a jamming signal and let the relay simultaneously transmit both the desired signal and the jamming signal every slot. The destination can decode...
This paper investigates the secrecy performance of half-duplex relay networks. First, we establish a relay broadcasting wiretap channel model using a half-duplex relay with multiple antennas and derive the instantaneous secrecy capacity of this system. With convex optimization, the upper bound on the capacity region is provided. Second, we give the expression for the ergodic secrecy rate and analyze...
The quadcopter technology has been developed for many years. It has the advantages of light weight, small size, high mobility and autonomy. At present, it is already a proven technology, especially in outdoor environments. As the Global Positioning System (GPS) can provide accurate geographic coordinates for quadcopters, this endows the drones with certain abilities, such as loiter and waypoint navigation...
A novel frequency selective radome (FSR), which is “transparent” within the operating band of the antenna while absorbing out-of-band incoming waves in a very wide band, is presented in this article. In order to absorb undesired signals out of the band, square loops loaded with lumped resistors are used. The pass-band property is realized by employing meandering square slots with a smaller period...
A novel third-order band-pass frequency selective surface (FSS) is proposed in this paper. This FSS has a good filtering performance at 16–18GHz in the terms of band-pass flatness and steep-cutoff characteristic by using multi-layer surfaces cascade coupling each other. The FSS is comprised by three patch surfaces and two aperture surfaces with the total thickness of only 2mm (1/9 λ) and has a −1dB...
A design scheme is proposed for wireless interconnection communication between chips. The PCB medium channel is built with absorber layers. Two chip pin antennas are designed and simulated. Their scattering parameters are extracted and compared with three different cases. It evaluates the bit error rate (BER) performance via a interconnect communication model with a coherent binary phase shift keying...
In this paper, we propose a novel active frequency selective surface(AFSS) that transmits 2.45 GHz WLAN signals in the ON state while functioning as a band-stop filter to shield those signals in the OFF state. A special topology that requires no additional biasing lines between two adjacent FSS cells is applied to weaken the feeder network's negative impact on the transmission characteristics of the...
Millimeter-wave communication is deemed to be one of the promising solutions to meet the growing traffic explosion for the next generation wireless communication system. The compact design of millimeter-wave antenna makes it possible to form large number of narrow beams to cover a certain area. However, the number of beams that can be scheduled simultaneously is not as many as possible due to the...
In this paper, a mmWave unified access and back-haul (UAB) network is presented, where both radio access (RA) and backhaul (BH) share the same millimeter wave bands. Considering uniform resource allocation of RA and BH radio resource for all pico stations, which can well mitigate the interference among pico stations, the capacity of UAB is mainly influenced by the allocated resource ratio between...
As requirements for the monitoring of warehouse environment tends to be more instant, precise and intelligent, this paper proposed a system framework for the monitoring of warehouse environment based on the technology of internet of things. Based on the framework proposed, a solution of warehouse environment monitoring and realized monitoring systems on three platforms, including monitor terminal,...
Selective relaying based on instantaneous channel status is usually adopted to improve transmission performance in cooperative communication systems. However, such scheme has an extremely high computational complexity. To reduce the complexity, we propose a selective cooperation scheme to decide whether cooperative transmission should be adopted or not by utilizing statistical channel information...
Localization algorithm is an important and challenging topic in today's wireless sensor networks (WSNs). In order to improve the localization accuracy, a weighted centroid localization algorithm based on least square to predict the location of any sensor in a WSNs is proposed in this paper. The proposed algorithm proposes a Least-Square-based weight model which can reasonably weigh the proportion...
Min-Max localization algorithm is usually used by wireless sensor nodes because of the reason that it considers few conditions and have a coarse localization which can determine a blind node within a certain range. In this paper, we propose improved Extended Min-Max (improved E-Min-Max) algorithm for localization in wireless sensor networks (WSNs). Experimental results show that improved E-Min-Max...
To bridge the widening gap between computation requirements and communication efficiency faced by many-core chips, Wireless Network-on-Chip (WiNoC) has been proposed by using ultra-wideband interconnect. While prior research has demonstrated the salient features of WiNoC as high perlink data rate, high accumulated bandwidth, high flexibility, low overhead and low power consumption, this research aims...
This paper considers the decode-and-forward (DF) relaying scheme in cooperative communication networks. Specifically, this study considers a cooperative network, in which each relay can obtain perfect channel state information (CSI) from the source to itself, and the destination can acquire perfect CSI from all the relays to itself, but the destination does not need all CSI from the source to all...
Energy consumption is a vital concern when implementing distributed decision fusion in most wireless sensor networks. This paper studies the impact of sensor censoring on the decision fusion performance when the number of sensors is unknown at the fusion center. The global decision rule adopted at the fusion center is the Chair-Varshney fusion rule modified to take account of the unknown network size...
This paper introduces the development of an effective low cost monitor system to assist the normal function and the maintenance of Overhead Contact System(OCS). The whole system contains a remote monitor centre, some local monitor centres and lots of monitor modules. All the communications are through wireless network. The paper also shows how such a system could be used for OCS monitor, and the detection...
In this paper, we evaluate the factors affecting the accuracy achievable in localization of an endoscopic wireless capsule as it passes through the digestive system of the human body. Using a three-dimension full electromagnetic wave simulation model, we obtain bounds on the capsule-location estimation errors when the capsule is in each of three individual organs: stomach, small intestine and large...
Future pervasive communication systems requirements for highly performing, flexibly deployable and cost/energy-efficient services and applications are expected to revolutionize the way we design, optimize and use wireless networks. From a cellular perspective, the emphasis is placed on achieving ubiquitous and reliable real-time data communications at cell-edge, as articulated in ITU's IMT-Advanced...
Two transmit antennas placed symmetrically for a linear cell downlink distributed antenna system with Alamouti space-time block coding over Rayleigh fading channels. For mobile station located in different places in the cell, which mode should be selected by base station from one transmit antenna or two transmit antennas? Aiming to solve this problem, a transmit mode selection scheme is developed...
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.