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16 CODE DIVISION MULTIPLE ACCESS (CDMA)
1.2.1 ALOHA
The most common contention-based methods are random access methods. The first random
access method was developed by ... Techniques for
Code Division Multiple Access
In the previous chapter, we reviewed the basic concepts of multiuser communications and the
multiple access...
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34 CODE DIVISION MULTIPLE ACCESS (CDMA)
The benefit of Gold codes is that a large number of these codes are available for a given
length N while having ... 28, 2006 15:54
30 CODE DIVISION MULTIPLE ACCESS (CDMA)
FIGURE 2.4: Comparison of original/despread signal and spread signal spectra for DS/SS with square
pulses.
2.2.2 Mu...
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82 CODE DIVISION MULTIPLE ACCESS (CDMA)
3.1.4 Statistical Multiplexing
The final fundamental CDMA concept that we will discuss in this section is termed statistical
multiplexing, which ... SPECTRUM TECHNIQUES FOR CODE DIVISION MULTIPLE ACCESS 71
This is in stark contrast to DS-CDMA, which is very sensitive to the near-far problem as seen
in Figure 2. 29.
2 ....
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114 CODE DIVISION MULTIPLE ACCESS (CDMA)
Node 1
Node 2
Node 3
Node 4
Node 5
Node 6
Node 7
Common code
Common code
C
o
d
e
#
4
C
o
d
e
#
2
Primary collision
Secondary
collision
FIGURE ... MOBK023-Buehrer.cls September 28, 2006 15:55
118 CODE DIVISION MULTIPLE ACCESS (CDMA)
indicator of the success or failure of packet...
... in Figure 5.5 [99 ]. In this method, all users are again ordered in
P1: IML/FFX P2: IML
MOBK023-05 MOBK023-Buehrer.cls September 28, 2006 15:56
132 CODE DIVISION MULTIPLE ACCESS (CDMA)
CDMA
receivers
Single
user
Multiuser
Matched
filter
Adaptive
filters
Optimal
(MLSE)
Sub-optimal
Linear ... 15:56
146 CODE DIVISION MULTIPLE ACCESS (CDMA)
where p = [P
1
, P
2
, P
K
] and...