Biomedical Engineering Reference
In-Depth Information
Antenna Diversity Techniques for Enhanced
Ultra-Wideband Body-Centric Wireless
Networks in Healthcare
Qammer H. Abbasi, Akram Alomainy and Yang Hao
Abstract
Achieving better system performance and receiving optimum communi-
cation link quality with minimum power consumption is the main drive behind the
recent surge in interest in diversity-based techniques, whether it is from a spatial,
frequency or polarisation perspective. In this chapter, studies for applicability of
antenna diversity to be applied in ultra-wideband (UWB) on/off-body channel are
carried out. Measurements are performed in both an anechoic chamber (no multi-path
reflections) and in a typical indoor environment (dense multi-path surroundings) on
a human candidate for various daily life activities including both static and dynamic
cases. Various diversity techniques are applied to highlight the benefit of incorpo-
rating such methods in enhancing the overall system performance by increasing the
reliability of the link and hence, successful reception rate.
Keywords
Body-centric wireless network
·
UWB channel
·
Diversity
·
UWB
on/off-body diversity
·
On-body diversity radio channel
·
UWB antenna
·
Diversity
combining
·
On-body position
Introduction to Diversity for Body-Centric Wireless Network
Body-centric wireless networks (BCWNs) mainly experience fading due to the fol-
lowing: relative movements of body parts, polarisation mismatch, shadowing and
diffraction and scattering from the body parts and surrounding environments [
1
].
Diversity is a powerful technique to combat fading and multi-path effects [
2
]. The spa-
tial diversity does not need any additional spectrum and, also, the UWB is inherently
a frequency diversity technology. This makes the spatial arrangement of multiple
A. Alomainy (
)
Y. Hao
Antenna & Electromagnetics Research Group,
School of Electronic Engineering and Computer Science,
Queen Mary, University of London, Mile End Road,
E1 4NS London, United Kingdom
e-mail: akram.alomainy@eecs.qmul.ac.uk
Q. H. Abbasi
University of Engineering & Technology, Lahore, KSK, Pakistan
·
Q. H. Abbasi
·
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