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Multiple-Access and Broadcast Channels
Many senders into one receiver, and one sender to many receivers: capacity regions rather than a single number.
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Gaussian MAC with
P
1
=
10
P_1=10
P
1
=
10
,
P
2
=
1
P_2=1
P
2
=
1
,
N
=
1
N=1
N
=
1
;
user 1 is decoded first. Compute
R
1
=
1
2
log
2
(
1
+
P
1
P
2
+
N
)
R_1 = \tfrac12\log_2\bigl(1+\tfrac{P_1}{P_2+N}\bigr)
R
1
=
2
1
lo
g
2
(
1
+
P
2
+
N
P
1
)
in bits. Round to 3 decimal places.
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AC
7
8
9
+
4
5
6
−
1
2
3
×
0
.
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