Biomedical Engineering Reference
In-Depth Information
Table 6.1 Different communication scenarios
Scenario name
Number of users
Coordinator position
Sensor node position
Body moments
Scenario 1
1
Off-body
On-body
Still
Scenario 2
1
Off-body
On-body
Walking
Scenario 3
1
On-body
On-body
Walking
Scenario 4
2
Off-body
On-body
Still
Fig. 6.11
Measured average transmit power spectrum at 100 MHz PRF
possible value. Fixed PPB experiments are used as control experiments that highlight
the performance improvement introduced by the dynamic BER allocation proce-
dure. All the experiments are carried out in a normal laboratory set up in order to
simulate an indoor propagation environment. It should be noted that the receive
signal strength at a given distance from a sensor nodes are largely dependent on the
antenna properties such as directivity and gain.
1
1
These experiments were carried out using the antennas that were developed in house and
available at the moment of the experiments. Link budget shown in
Chap. 5
gives a rough estimate
for the range of the UWB link.
