In other words, we can have a scenario where UE #1 gets an allocation
of 5 multicodes and UE #2 gets an allocation of 6 multicodes. The data traffic for both users is
transmitted at the same time and can be separated with the knowledge of the channelization codes used.
Assuming a (K 1)-multicode signal, an M-path channel, and a RAKE receiver with M fingers,
we can draw the block diagram in Fig. 7.115. For each time of arrival, multicode despreading
is performed.
Let us assume the receive signal is given as
(7.150) r(t) aM
l1aK
k0
dk(t tl) # CCH, jk(t tl ) # Scr(t tl)
Then we simply show the first despreader output of the finger tracking the first arriving ray as
(7.151)
d0(t) 3
SF
e aM
l1aK
k0
dk(t tl) # CCH, jk(t tl) # Scr(t tl) f # S*
cr(t t1) # CCH,j(t t1) dt
432 CHAPTER SEVEN
X DPDCH1
Cd,1
Cd,3
bd
bd
Cd,5 bd
Cd,2 bd
Cd,4 bd
Cd,6 bd
Chs bhs
Ced bed
Cc bc
Chs bhs
Ced bed
X
X X
Sum
X X
X X
X X
X X
X X
X X
X X
X X
X X
DPDCH3
DPDCH5
HS-DPCCH
E-DPDCH
Ced bed
X X E-DPDCH
X
DPDCH2
Sum
Q Channel
I Channel
DPDCH4
DPDCH6
DPCCH
HS-DPCCH
(Nmax DPDCH = 2, 4, or 6)
(Nmax DPDCH = 1, 3, or 5)
E-DPDCH
SUL
SUL
LPF
LPF
Quadrature
Modulator
X
C1
C2
Down
Sample
& Hold
X
(??“1)n
FIGURE 7.
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