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| 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： | 4/23页 |
| 文件大小： | 415K |
| 代理商： | TPTDSCDMAWP |
Spatial Temporal Processing in TD-SCDMA
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12
4.
Types of Channel Impulse Response
When dealing with spatial-temporal signal processing in the TD-SCDMA, we need to identify two
types of channel impulse responses – non-directional channel impulse response and directional
channel impulse response.
4.1.
Non-Directional Channel Impulse Response.
Let’s first discuss the non-directional channel impulse response. The impulse
response is defined between each individual user and its antenna. A non-
directional channel response between user k and antenna ka can be modeled as
a FIR filter with W taps:
h
(k,ka) = [h
1
(k,kd),h
2
(k,kd), … , h
W
(k,kd) ]T
(13)
We can stack all of the channel impulse responses of the k users together to
form the non-directional channel impulse response matrix:
=
)
,
(
W
)
2
,
(
W
)
1
,
(
W
)
,
(
2
)
2
,
(
2
)
1
,
(
2
)
,
(
1
)
2
,
(
1
)
1
,
(
1
)
(
h
Ka
k
Ka
k
Ka
k
H
(14)
Then we stack all users’ matrixes together to form the system non-directional
channel impulse response matrix:
H = [ H
(1)T, H(2)T,……, H(K)T ]
4.2.
Directional Channel Impulse Response
The second type of channel impulse response is the directional channel impulse
response. The directional channel impulse response is directly related to each
signal path with a DoA and it is defined to be the channel impulse response
between user k and a reference point:
hd
(k,kd) = [h
d1
(k,kd),h
d2
(k,kd), … , h
dW
(k,kd) ]T
Similarly as with the non-directional channel impulse response matrix, we have:
=
))
(
,
(
dW
)
2
,
(
dW
)
1
,
(
dW
))
(
,
(
d2
)
2
,
(
d2
)
1
,
(
d2
))
(
,
(
d1
)
2
,
(
d1
)
1
,
(
d1
)
(
h
k
Kd
k
Kd
k
Kd
k
d
H
(15)
Where Kd(k) is the number of DoA paths of the k
th user.
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