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.
Design and analysis of an ultra-wide band antenna consisting extra radiating patch with bandwidth enhancement and band notch characteristic is presented. Antenna consists of an exciting rectangular patch on the front side and an extra radiating patch with π shaped slot on the backside of the substrate. By inserting a slot to the antenna, WLAN notched frequency band is achieved. A conceptual modal,...
Abstract-Unlicensed LTE system holds high potential to effectively offload data/video traffic from the crowded licensed band. Previous effort of deploying LTE in the unlicensed band (e.g. license-assisted access LAA) relies on one or more LTE carriers in the licensed band, and may not be desired in certain scenarios. This paper studies a new technology of utilizing LTE directly in an unlicensed band,...
In this article, we have proposed a novel rectangular microstrip slot antenna with frequency reconfigurable characteristics for wireless applications. With the aid of two switches the reconfigurable characteristic of antenna is achieved thus enabling it to work in multiple modes. By making these switches ON and OFF, the antenna's frequency of operation can be varied. The antenna has a single band...
In this paper, a reconfigurable triple notched-band UWB (Ultra Wide Band) antenna is presented. This compact antenna covers the frequency range from 3.1 GHz to 11.21 GHz. In order to reject a three frequency bands including the WiMAX (3.2–3.6 GHz), WLAN (5.15–5.85 GHz) and X band (7.25–8.395 GHz), we have inserted three different slots in the radiating patch; two C-shaped slots and a rectangular slot...
Previously, we proposed the active access-point (AP) configuration algorithm for elastic Wireless Local-Area Network (WLAN) systems using heterogeneous APs. This algorithm activates or deactivates APs depending on traffic demands, assuming that any active AP can use a different channel to avoid interferences among APs. However, the number of non-interfered channels in IEEE 802.11 protocols is limited...
A Compact Wideband Monopole Antenna, designed for wireless applications has been investigated in this paper. The antenna consists of a Radiating Patch along with a Defected Ground Plane. The proposed antenna has been compared with a similar Radiating Patch without any Defected Ground Structure (DGS) and the results have been discussed with comparison plots. The proposed antenna covers a frequency...
Chaotic deployment of Wireless Local Area Networks (WLANs) in dense urban areas is one of the common issues of many Internet Service Providers (ISPs) and Wi-Fi users. It results in a substantial reduction of the throughput and impedes the balanced distribution of bandwidth among the users. Most of these networks are managed independently and there is no cooperation among them. Moreover, the conventional...
One of the promising techniques to enhance MAC efficiency is orthogonal frequency division multiple access (OFDMA). Even though OFDMA-based WLAN allows multi-user transmissions, it requires a careful design of resource management particularly in densely deployed WLANs. To address this problem, we propose a two-phase resource allocation (TPRA) algorithm. In TPRA, an access points (AP) determines its...
This paper addresses the dilemma faced by the users while selecting the most suitable network in a heterogeneous wireless environment with a combination of hierarchical evaluation of networks and game theory. Analytical hierarchy process (AHP) is used to establish a hierarchy among network evaluation criteria for different types of service requests. Network hierarchy achieved from the AHP analysis...
In this paper, the authors develop a novel wireless LAN base station with DPI(Deep Packet Inspection) based QoS control, which can maintain QoE during congestion. In the QoS control, the base station always monitors the file type which is found in HTTP messages encapsulated in an IP packet and prioritizes the packet. Since the control is light weight, it can be easily implemented a LAN base station...
Recent years have seen development of variety of dual band antennas specifically for next generation wireless communications systems that will require increased bandwidth and higher data rates. These dual band antennas find application in mobile terminals, such as cellular devices or portable laptops, Wi-Fi dongles. Antennas employed in such systems have certain requirements: High gain, stable and...
An extremely wideband monopole antenna combined for Bluetooth at 2.4 GHz and Ultra-Wide Band (3.1–10.6 GHz) with triband notched characteristics is presented. The frequency range from 2 to 17.5 GHz is achieved by cutting triangular portions from edges of rectangular ground plane. The radiating patch has three slots to work as triple band notch for WiMAX at 3.5 GHz, WLAN at 5.2 GHz, 5.8 GHz and X-band...
A compact dual – band antenna for 2.4/5.2/5.8-GHz wireless local area network (WLAN) applications ispresented. The antenna consists of two elements, a C shapedelement and a E shaped element. Both of these elements result inexcitation of two resonant modes for dual – band operation. TheC shaped element is fed directly with coaxial probe. The Eshaped element is coupled with ground plane using a connectingcylindrical...
Inversely proportional setting (IPS) of the transmission power and carrier sense threshold (CST) to a portion of access points/stations is discussed through numerical evaluation and experiments to examine coexistence with legacy devices. In densely deployed wireless local area networks (WLANs), tuning CST is a promising approach to facilitate spatial channel reuse. Particularly, IPS of the transmission...
In this paper, Coaxial feed dual band circular Microstrip patch antenna (CMPA) for ISM (2.4–2.5GHz) and WLAN (5.150–5.350GHz) application is proposed. Dual frequency bands are obtained by inserting a circular slot in the circular radiator as well as bandwidth enhancement is obtained by modifying the ground plane. FR-4 substrate having dielectric constant of 4.4 and thickness of 1.6 mm is used to simulate...
In this paper, we propose a vertical handover decision algorithm. This algorithm executes the vertical handover based on several network criteria like the network delay, the available bandwidth, the received signal strength, etc. Fuzzy logic system was used to implement the handover initiation module while utility function was chosen for the network selection module. We compare our proposed algorithm...
This paper presents our research in developing high performance but low complexity MIMO decoders for the newest WLAN, i.e. 802.11ac. K-best and Trellis methods are proposed to develop the MIMO decoders. Their performances are observed and compared to MIMO decoders which are based on linear and optimal methods, i.e. ZF, MMSE, and ML. Run test of 2×2 MEMO, 64-QAM, Coding rate 3/4, and 40MHz of bandwidth...
This paper presents the design of tri-band planar dipole antenna for PCS and WLAN services. A modification is made in the previously presented dipole antenna design [1]. The configuration of the proposed dipole antenna is given in Figure 1(a). The antenna design consists of a printed dipole and two parasitic elements which are behaving as resonators by coupling from the driving element. The proposed...
In this research article, a compact dual band asymmetric coplanar strip-fed printed antenna is designed and presented for Bluetooth, WLAN/WiMAX and public safety applications. The dual frequency operating bands (2.45 GHz and 5.25 GHz) have been achieved by attaching two simple meander shaped radiating strips to the ACS feed line. The proposed antenna geometry is printed on a low cost FR4 substrate...
In this paper, we propose a new miniaturized dual band frequency selective surface (FSS) for Wi-Fi applications. The proposed FSS possesses 0.42 GHz and 0.30 GHz bandwidths with insertion loss less than −15 dB around the two central operating frequencies 2.4 GHz and 4.6 GHz, respectively. The FSS exhibits excellent miniaturization with 0.057⋋1 × 0.057⋋1 or 0.11⋋2×0.11⋋2 unit cells, where ⋋1 and ⋋2...
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.