Biomedical Engineering Reference
In-Depth Information
Table 5.5
Link budget analysis for the two UWB receiver designs
Parameter
Value
Design 1
Design 2
Frequency
3.5-4.5 GHz
Throughput (R
b
)
5 Mbps
Signal bandwidth (B)
1 GHz
Transmitter implementation loss (L
Tx
)
5 dB
Average Tx. Power (P
Tx
= -41.3 dBm/MHz + 10log(B/1 MHz)
- L
Tx
)
-16.3 dBm
Tx antenna gain (G
T
)
0 dBi
Average path loss (PL) at 1 m [
28
]
55 dB
Rx antenna gain (G
R
)
0 dBi
Average Rx power (P
Rx
= P
Tx
- PL)
-71.3 dBm
Thermal noise (N
0
= -174 dBm/Hz + 10log (B)
-84 dBm
Noise figure (NF)
3.55 dB
1.41 dB
Minimum signal to noise ratio requirement (SNR
min
)
12 dB
Receiver implementation loss (L
Rx
)
9 dB
Processing gain (G
p
= 10 log (B/R
b
))
23 dB
Receiver sensitivity at 1 m (P
R,min
= N
0
+ NF + SNR
min
+ L
Rx
- G
p
)
-82.45 dBm
-84.59 dBm
Link margin (M = P
R
- P
R,min
)
11.15 dB
13.29 dB
After LPF
and Amp
8
ns
.
Before LPF
Fig. 5.29
Received UWB signals
