Biomedical Engineering Reference
In-Depth Information
UWB RF Module
Pulse generator
UWB
ANT
V
DD
A
BPF
(3.5-4.5 GHz)
b
Square wave
generator
LPF
(DC-1.4 GHz)
X
OR
d
a
Buffer 1
e
V
DD
B
AND
c
Buffer 2
VCO (4G Hz)
Interface Electronics
NB ANT
UWB EN.
A/D
ยต
-Controller
Analog
inputs
INA321
g
f
Rx. Data
Envelop
Detector
BPF
(433.05- 434.79 MHz)
Digital inputs
NB receiver module
Fig. 5.22
Overall integration of the sensor node
implementations of transmitters/receivers or are not intended for WBAN appli-
cations. Hence, comparison in Table
5.3
is limited only to sensor node designs
with full implementations, which include wireless transmitters/receivers, micro-
controllers and data acquisition electronics.
It can be seen from Table
5.3
that the dual band WBAN sensor node presented
in this chapter outperforms other sensor nodes in terms of data rate, power con-
sumption and form factor. This design incorporates the unique advantages pro-
vided by UWB, such as possibility of achieving high data rates, low power
consumption and simple design while avoiding the complexities introduced by
UWB receivers. Because of the use of a narrow band receiver at the sensor node, it
is possible to achieve a reliable communication link while consuming low power
during data reception.
5.3 Implementation of the Coordinator Node
Coordinator node is responsible for controlling the communication with multiple
sensor nodes while maintaining acceptable levels of BER, delay and QoS. It
consists of four main component blocks mentioned below:
(1) IR-UWB receiver front-end
The IR-UWB receiver front-end down-converts the received UWB pulses creating
a base band pulse stream that can be detected using a sampling and data processing
unit.
