Localized transmission scheduling for spatial multiplexing using smart antennas in wireless adhoc networks

2004 ◽  
Author(s):  
Dhananjay Lai ◽  
T. Joshi ◽  
D.P. Agrawal
Keyword(s):  
Smart Antennas ◽  
Spatial Multiplexing ◽  
Transmission Scheduling ◽  
Adhoc Networks ◽  
Wireless Adhoc Networks

scholarly journals Low-Profile Metamaterial-Based Adaptative Beamforming Techniques

2020 ◽  
Author(s):  
Chung-Tse Michael Wu ◽  
Pai-Yen Chen
Keyword(s):  
Beam Steering ◽  
Smart Antennas ◽  
Spatial Multiplexing ◽  
Basic Principles ◽  
Practical Applications ◽  
Critical Comparison ◽  
Low Profile ◽  
Radiation Properties ◽  
Millimeter Wave Range ◽  
Wave Range

In this chapter, we will review recent research advances on beamforming and spatial multiplexing techniques using reconfigurable metamaterials (MTMs) and metasurfaces. This chapter starts by discussing basic principles and practical applications of transmission line-based metamaterials and planar metasurfaces, followed by their active versions that enable novel smart antennas with beam steering and beamshaping functions. We include detailed descriptions of their practical realizations and the integration with circuits and the radio-frequency (RF) frontend, which are used to adaptively and dynamically manipulate electromagnetic radiation. We summarize the state-of-the-art MTM/metasurface-based beamforming techniques and provide a critical comparison for their uses in the RF-to-millimeter-wave range in terms of cost, reconfigurability, system integratability and radiation properties. These techniques are expected to pave the way for the massive deployment of communication, radar, remote sensing and medical and security imaging systems.

scholarly journals EFFICIENT ROUTING PROTOCOL WITH COLLISION AVOIDANCE IN VEHICULAR NETWORKS

2019 ◽  
Vol 2019 (02) ◽  
pp. 76-86 ◽  
Author(s):  
Sivaganesan D.
Keyword(s):  
Natural Disasters ◽  
Traffic Flow ◽  
Collision Avoidance ◽  
Routing Protocol ◽  
Vehicular Networks ◽  
Network Simulator ◽  
Road Vehicles ◽  
Adhoc Networks ◽  
Vehicular Adhoc Networks ◽  
Wireless Adhoc Networks

The vehicle-Adhoc Networks are the specific type wireless adhoc networks, framed using the group of vehicles supporting the “on the fly’ communication between vehicles on the roadside. This is basically developed to handle the traffic in an intelligent manner avoiding the unnecessary time elapse, discomfort and the fatalities during the travelling and in turn improvise the convenience in the transportation providing a continuous traffic movement. But certain emergent situations such as the natural disasters, accidents, damaged roads, sudden break down of the vehicles and the appearance of the emergency vehicles disturb the regular traffic flow and safety of the on road vehicles. To ensure the safety of on road vehicles and elude the collision of the vehicles that take place due to improper communications or communication attacks, the paper puts forth an effective routing protocol with collision avoidance, (ERPCA) to identify vehicles with the reliability to transfer information on time and evade the discomforts in travelling. The evaluation of the ERPCA with the network simulator-2 evinces the improvement in the performance of the vehicular-adhoc networks

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