<s>
The	O
distance	O
bound	O
computed	O
by	O
a	O
radio	O
frequency	O
distance	O
bounding	O
protocol	O
is	O
very	O
sensitive	O
to	O
even	O
the	O
slightest	O
processing	B-Protocol
delay	I-Protocol
.	O
</s>
<s>
Conventional	O
radios	O
have	O
processing	O
times	O
that	O
are	O
orders	O
of	O
magnitudes	O
too	O
big	O
,	O
even	O
if	O
the	O
function	O
applied	O
is	O
a	O
simple	O
XOR	B-Application
.	O
</s>
<s>
The	O
result	O
is	O
a	O
circuit	O
whose	O
processing	B-Protocol
delay	I-Protocol
is	O
below	O
1	O
nanosecond	O
from	O
receiving	O
a	O
challenge	O
till	O
sending	O
back	O
the	O
response	O
.	O
</s>
<s>
This	O
processing	B-Protocol
delay	I-Protocol
translates	O
into	O
a	O
maximum	O
potential	O
distance	O
error	O
of	O
15cm	O
.	O
</s>
<s>
In	O
2015	O
,	O
the	O
same	O
protocol	O
was	O
modified	O
,	O
prototyped	B-Application
and	O
practically	O
evaluated	O
for	O
ten	O
indoor	O
and	O
outdoor	O
locations	O
.	O
</s>
