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参数资料
| 型号： | TPTDSCDMAWP |
| 英文描述： | Spatial Temporal Processing in TD-SCDMA |
| 中文描述： | 时间空间处理在TD - SCDMA |
| 文件页数： | 23/23页 |
| 文件大小： | 415K |
| 代理商： | TPTDSCDMAWP |
Spatial Temporal Processing in TD-SCDMA
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9
3.
System Model
3.1.
Channel Model
In a TD-SCDMA system, we have K users who access the channel
simultaneously. On the same frequency and in the same time slot. Figure 3-1
shows a general model of a TD-SCDMA System.
C(1)
C(k)
C(K)
h(1)
h(k)
h(K)
n
Data
Esti-
mation
e
)
(K
b
)
(k
b
)
1
(
b
C(1)
C(k)
C(K)
h(1)
h(k)
h(K)
n
Data
Esti-
mation
)
1
(
d
)
(
k
d
)
(
K
d
)
1
(
d
)
(k
d
)
(K
d
e
)
(K
b
)
(k
b
)
1
(
b
Figure 3-1 Discrete base band model of a TD-SCDMA system.
In the system of Figure 3-1 we assume that there are Ka antennas for the
receiver .
The k
th user transmits a data symbol sequence block with N symbols:
()T
k
N
k
d
)
(
)
(
2
)
(
1
)
(
,
=
d
k = 1,2,…..,K
(1)
[]T
k
N
k
d
)
(
)
2
(
)
1
(
)
(
2
)
2
(
2
)
1
(
2
)
(
1
)
2
(
1
)
1
(
1
)
(
,
=
d
(2)
Where N is the number of symbols in each data block.
(
)T
k
Q
k
d
c
)
(
)
(
2
)
(
1
)
(
=
c
k = 1, 2 … K
(3)
)
(k
c
is the k
th user signature, N is the number of symbols in each data block and
Q is the spreading factor. All users are assumed to be at the same spreading
factor.
Each of the K channels in the system is characterized by its impulse response
[]T
k
W
k
h
)
(
)
(
2
)
(
1
)
(
=
h
k = 1,2 … K
(4)
Where W is the number of taps in the channel.
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