Signal design for bandwidth-efficient multiple-access communications based on eigenvalue optimization

2000 ◽  
Vol 46 (6) ◽  
pp. 2045-2058 ◽  
Author(s):  
T. Guess ◽  
M.K. Varanasi
Keyword(s):  
Multiple Access ◽  
Signal Design ◽  
Eigenvalue Optimization ◽  
Multiple Access Communications

Photonic code-division multiple-access communications

1997 ◽  
Vol 16 (2) ◽  
pp. 129-157 ◽  
Author(s):  
David D. Sampson ◽  
Graeme J. Pendock ◽  
Robert A. Griffin
Keyword(s):  
Code Division Multiple Access ◽  
Multiple Access ◽  
Multiple Access Communications ◽  
Code Division Multiple

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.

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