Biomedical Engineering Reference
In-Depth Information
The received power is equal to:
P
RX
=
P
TX
−
PL
=−
49 dBm
(8)
Thus, in this case, we have again a
LM
left for shadowing, body loss, polarization
mismatch, and other losses, that is equal to:
LM
=
P
RX
−
S
=
11 dB
(9)
On-Body and Off-Body Low Rate Communication
Let us consider now the case in which a high data rate is not required, and thus the 60
GHz transceivers can communicate by exploiting the LRP. Let us suppose that the
transceivers are equipped with omni-directional antennas. Therefore, the following
considerations apply to both on-body and off-body communication scenarios. Let
us suppose also that SNR requirements are the same as for the HRP case (this
is a worsening condition: the use of a simpler modulation scheme in LRP with
respect to HRP relaxes largely SNR requirements to achieve a certain BER). In
this case it is possible to realize the wireless communication even by means of
single transceivers, because of the reduced minimum sensitivity due to the smaller
communication bandwidth (
BW
=
92 MHz) of the LRP with respect to the HRP (and
hence less noise floor).
S
=−
174 dBm
/
Hz
+
NF
+
10
×
log
10
(
BW
)
+
SNR
=−
63 dBm
(10)
The received power is
P
RX
=
P
TX
−
PL
=−
59 dBm
(11)
Thus, even with a single transmitter and receiver, in this case we could still have a
LM
left, equal to:
LM
=
P
RX
−
S
=
4 dB
(12)
Conclusions
In this chapter we presented the opportunity offered by the emerging wireless body-
centric networks, envisaging their applications to a number of possible future civil
applications, beyond the current interests limited to military applications. In partic-
ular, we addressed the opportunities of implementing SoC transceivers in support
of the needs required by the wireless body-centric networks, be they for on-body or
off-body communication scenarios. In detail, we focused on the feasibility through
preliminary analyses considering the characteristics of the 60-GHz radio channel,
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