Digital Signal Processing Reference
In-Depth Information
7.4.2 PDF of max
k
=1,
…
,
M
H
k
(
t
)
We define H
M
(
t
) as follows: H
M
(
t
)
de
= max
k
=1,…,
M
H
k
(
t
)
.
The PDFs of H
M
(
t
)
of conventional
and adaptive opportunistic beamforming algorithms are compared in Figure 7.8. It can
be seen that adaptive opportunistic beamforming considerably shifts the range of H
M
(
t
)
2.5
Adaptive Opportunistic
Beamforming
Conventional Opportunistic
Beamforming
2
1.5
1
0.5
0
−0.5
0
0.5
1
1.5
2
Maximum value of the equivalent channels across all users
(a)
2
Adaptive Opportunistic
Beamforming
Conventional Opportunistic
Beamforming
1.5
1
0.5
0
−0.5
0
0.5
1
1.5
2
2.5
3
3.5
Maximum value of the equivalent channels across all users
(b)
FIgure 7.8
Comparison of the PDF of the maximum value H
k
(
t
)
of the equivalent channels in
conventional and adaptive opportunistic beamforming: (a)
K
k
= 10,
M
= 5,
N
= 2; (b)
K
k
=
10,
M =
5,
N =
8. (Reproduced from Kim et al., 2006. © 2006, IEEE. With permission.)
Search WWH ::
Custom Search