Digital Signal Processing Reference
In-Depth Information
2
2
2
2
4
4
4
4
6
6
6
6
8
8
8
8
2
4
2
4
2
4
2
4
(a)
(b)
(c)
(d)
FIGURE 3.30
(a) Decoded matrix
x
, (b) thresholded matrix, (c) crisp rank matrix, and (d) fuzzy rank matrix,
for
Q
25 dB. The first row corresponds to the correct decision. (From A.
Flaig et al.,
Signal Process. Spec. Iss. Fuzzy Process.
, 80, 1017-1036, June 2000. c
=
8
,L
=
5, and SNR
=
2000 Elsevier. With
permission.)
10
−
3
FROD
MRSR
10
−
4
10
−
5
10
−
6
10
−
5
10
−
4
10
−
3
spreading parameter
FIGURE 3.31
Bit error rate of FRO detector vs. the fuzzy spreading parameter (
λ
) for
M
=
2
,Q
=
16
,L
=
5, and
SNR
25 dB. The bit error rate of the MRSR is shown for reference. (From A. Flaig et al.,
Signal
Process. Spec. Iss. Fuzzy Process.
, 80, 1017-1036, June 2000.
c
=
2000 Elsevier. With permission.)
correct hits, there are also somewhat weaker hits scored by interfering users
in rows two, five, and eight. Figure 3.30b shows the corresponding thresh-
old matrix, where black (0) and white (1) represent nonhits and hits, respec-
tively. Due to the hard decision the second hit in the first row is irrevocably
lost.
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