10
0
10
1
-80
-75
-70
-65
-60
-55
-50
-45
-40
Frequency (GHz)
UWB EIRP Emission Levelin dBm/MHz
-41.3 dBm
-75.3 dBm
-53.3 dBm
-51.3 dBm
3.1
10.6
1.99
1.61
0.96
Figure 1.1
FCC spectral mask for indoor applications
medium-rate communications (50 kbps to 1 Mbps) with ranges of 100 m with positioning
capabilities. UWB allows centimeter accuracy in ranging as well as in low-power and low-
cost implementation of communications systems. In fact, the IEEE 802.15.4a, a standard
for low-power, low-date-rate wireless communications, is primarily focused on position
location applications. The price point will be in the sub-$1 range for asset tracking and
tagging, up to $3 to $4 per node for industrial-control applications. These features allow
a new range of applications, including military applications, medical applications (mon-
itoring of patients), family communications/supervision of children, search-and-rescue
(communications with fire fighters, or avalanche/earthquake victims), control of home
applications, logistics (package tracking), and security applications (localizing authorized
persons in high-security areas).
1.1.5 Pulse- or Multicarrier-Based UWB
The main stream papers in the literature deal with pulse-based UWB systems. One reason
may be due to the fact that the pulse-based UWB was not sufficiently understood compared
to orthogonal frequency-division multiplexing (OFDM) based UWB.
The major reasons for the standard body (IEEE 802.15.3a) to adopt multiband scheme