Massive multiple access wireless LAN using ultra-wideband waveguide floor tiles

2016 ◽  
Author(s):  
Akihito Noda ◽  
Akimasa Okada ◽  
Yudai Fukui ◽  
Yuichi Masuda ◽  
Hiroyuki Shinoda
Keyword(s):  
Wireless Lan ◽  
Multiple Access ◽  
Ultra Wideband ◽  
Floor Tiles

UWB Positioning Systsem Design: Selection of Modulation and Multiple Access Schemes

2007 ◽  
Vol 61 (1) ◽  
pp. 45-62 ◽  
Author(s):  
Hui Yu ◽  
Enrique Aguado ◽  
Gary Brodin ◽  
John Cooper ◽  
David Walsh ◽  
...  
Keyword(s):  
Multiple Access ◽  
High Performance ◽  
Ultra Wideband ◽  
Good Time ◽  
Modulation Scheme ◽  
Positioning System ◽  
Indoor Environments ◽  
Signal Design ◽  
Positioning Systems ◽  
Design Selection

In densely-populated cities or indoor environments, limited visibility to satellites and severe multipath effects significantly affect the accuracy and reliability of satellite-based positioning systems. To meet the needs of “seamless navigation” in these challenging environments an advanced terrestrial positioning system is under development. This system is based upon Ultra-Wideband (UWB) technology, which is a promising candidate for this application due to good time domain resolution and immunity to multipath. This paper presents a detailed analysis of two key aspects of the UWB signal design that will allow it to be used as the basis of such a high performance positioning system: the modulation scheme and the multiple access technique. These two aspects are evaluated in terms of spectral efficiency and synchronisation performance over multipath channels. Thus this paper identifies optimal modulation and multiple access techniques for a long range, high performance terrestrial positioning system using UWB.

scholarly journals Performance Improvement of Ultra Wideband Multiple Access Modulation System using a new Optimal Pulse Shape

2017 ◽  
Vol 6 (1) ◽  
pp. 20
Author(s):  
V. Goyal ◽  
B. S. Dhaliwal
Keyword(s):  
Performance Improvement ◽  
Pulse Shape ◽  
Multiple Access ◽  
Energy Levels ◽  
Rake Receiver ◽  
Correct Choice ◽  
Low Energy ◽  
Ultra Wideband ◽  
High Data ◽  
Very High

Ultra-wideband (UWB) uses very low energy levels to transfer data at very high data rate and bandwidth. An optimal and correct choice of transmission pulse shape is an important criterion in this technology. In this paper, we will present an approach for the generation of an optimal pulse shape with the optimal generation of pulse shape values that can provide effective results when transmitted using multiple access modulation technique over a multipath channel and received by a RAKE type receiver. The bit error analysis of constructed model is also given using Ideal Rake, selective RAKE, and partial RAKE receiver configurations.

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