International Journal of Ultra Wideband Communications and Systems
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International Journal of Ultra Wideband Communications and Systems (6 papers in press)
High Rejection Triple Band Notched Reconfigurable Monopole Superwideband Antenna Including Applications for WWAN & Bluetooth Wireless Communication Systems by Manish Sharma Abstract: In this manuscript, a reconfigurable superwideband triple notched band antenna is presented which covers impedance bandwidth of 2.75GHz-18.89GHz and is also useful for applications for WWAN (1.90GHz) and Bluetooth (2.40GHz) wireless applications. Prototype antenna is fabricated with radiating patch on one surface of substrate and ground on the other side. WWAN/Bluetooth applications bands are obtained by embedding quarter wavelength stubs corresponding to 1.9GHz and 2.4GHz respectively. Notched bands to eliminate WiMAX, WLAN and downlink satellite system frequency interference are end results of inverted T-shaped stub and by etching inverted C-shaped slots on radiating patch. Proposed antenna exhibits stable radiation pattern with maximum gain and radiation efficiency of 6.85dBi and 92.4% respectively. The proposed antenna is compact in size (2222 mm2 = 484mm2) and there is a close agreement between the simulated and the measured results like return loss and VSWR of the proposed antenna which shows high rejection at notched bands. Keywords: Superwideband; WWAN; Bluetooth; WiMAX; WLAN; Satellite Downlink system; Triple notch.
Modern Ultra-Wideband Communications: Recent Overview and Future Prospects by Xin Gao, Lian Huai Abstract: Regarding the modulation schemes and multiple access techniques, modern ultra-wideband (UWB) communication displays unique features in wideband, high-speed data transmission, low-power consumption and high security comparing to other wireless communication systems. We present a general review of historical development, key features and typical applications on UWB, then briefly discuss its recent progress in IEEE standards, application potentials for broadband wireless access and current benefits. Future development on UWB transmission schemes and challenges of system design, are concisely proposed in contrast to those of several other typical communication systems. Keywords: Ultra-wideband (UWB); modulation; detection; physical layer; wireless communication.
New Optimization Method to Minimize Overshooting Problem Using Genetic Algorithms Based on Laplace Crossover by Ouamri Mohamed Amine Abstract: Overshooting is undoubtedly the most ambitious challenge in planning cellular networks. This problem means the scope of antenna coverage exceeds that one intended, causing interference in adjacent cells. However, solving this problem remains a complex task for mobile operators. In this work, we propose a mathematical model underlying the overshooting problem in LTE network as well as a self-optimization process using genetic algorithm based on Laplace Crossover. The proposed algorithm aims to determine the appropriate antenna parameters in order to reduce a long-distance signal, which forms a discontinuous coverage area in other network sites. Numerical results of the performances of the proposed algorithm indicate that the effects of overshooting problem are reduced. Keywords: Overshooting; Optimization; Long Term Evolution; Coverage; Cellular Network; Genetic Algorithm.
Impact of Interference Free Frequency Channels on Optimum Time Slot Allocation for Priority based TSCH MAC by Martin K M, B. Seetha Ramanjaneyulu Abstract: TTime Slotted Channel Hopping (TSCH), the most promising MAC protocol under IEEE802.15.4 is meeting the growing demands of low power and determinism in time critical Industrial Wireless applications. An efficient duty cycle is a necessary mandate for time critical applications which can be achieved by an appropriate reduction of active time slots in the slot frame and this saves node power. Even though many attempts were done in realizing an optimum scheduling protocol, the impact of the number of channels on the optimum time slot allocation is not yet considered which signifies importance with the present scenario of many channels being induced by interference from neighboring wireless networks. Optimum time slot is essential for making efficient duty cycle. Hence a study on the impact of the number of channels on the optimum time slot allocation is necessitated and is accomplished in this paper. It is found that increasing the number of channels beyond a certain value does not have an impact on the optimum slot allocation and there is a direct relationship between the number of channels and the number of links per track and number of root node branches. Keywords: IEEE 802.15.4e; TSCH; 6TiSCH; Priority; Centralized scheduling; Time Critical; Optimum Time Slot.
Recent Techniques for Enhancement of Isolation in MIMO Antenna System: A Review
by Bhakti Nikam, Maruti Jadhav Abstract: Nowadays the utilization of wireless communication technologies is becoming more popular and there is a need of such ever evolving technologies. But these technologies have to provide high data rates, minimum bit error rate, less fading effect, limited channel bandwidth and good quality of service in order to qualify as the competent systems. Such requirements can be fulfilled with the use of Multiple-Input Multiple-Output (MIMO) antenna technology. In the MIMO antenna system, multiple antennas are used at the base station and also at the mobile terminals for the exchange of the information. For better results with the MIMO antenna system, the mutual coupling between the antenna components should be as low as possible. Due to the high mutual coupling in the antenna system, the characteristic performance of the antenna gets degraded. For this reason, it is essential to enhance the isolation in the multiple ports of the antenna. There are different methods to enhance the isolation of antenna elements such as defected ground structure, decoupling network, parasitic elements, neutralization lines, meta-material structure etc. In this review, some recent isolation enhancement methods are discussed qualitatively. These methods have different design structures and are used in different wireless applications. The MIMO antenna system can be used for information exchange in indoor networks, mobile communication systems, outdoor networks etc. Keywords: Defected ground structure; Isolation; Decoupling Network; Parasitic elements; Metamaterial structure; Neutralization Lines; MIMO antenna; Mutual coupling.
Phase Equalized Wiener Filter Based Hybrid Precoding for massive MIMO Systems by Khushal Thakur, Bhasker Gupta, Balwinder Sohi Abstract: The MIMO systems proved to be very beneficial in improving efficiency and QoS of wireless systems. However, for complex multimedia applications, massive MIMO is required because of the very small wavelength associated with it. Thus, massive MIMO turns to be a promising technology for 5G applications. However, to achieve higher QoS with a high count of antennas at the base station is complex and computationally expensive for a complete baseband precoder. As a result, Hybrid precoders that share the load between the digital (Baseband) and analog (RF) parts are proposed. In this paper, a phase equalized Wiener Filter Based precoder is analyzed. Simulation results depict that the proposed precoder outperforms the existing low complexity hybrid precoders. Keywords: massive MIMO; Hybrid Precoding; Wiener Filter; Phase Equalization; mmWave.