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| 型號： | ZFBLEWP |
| 英文描述： | ZF-BLE Joint Detection for TD-SCDMA |
| 中文描述： | 迫零線性均衡的聯(lián)合檢測的TD - SCDMA |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 316K |
| 代理商： | ZFBLEWP |
8
2.
Signal Model
2.1.
TDD/TDMA
Internet based applications, media (audio and video) enabled applications and file
transfers have very different bandwidth requirements for uplink and downlink traffic.
TD-SCDMA does not dictate a fixed utilization of the frequency band; rather uplink and
downlink resources are assigned according to traffic needs.
Symmetric
Traffic
Asymmetric
Traffic
UL
UL
DL
DL
Figure 2-1 Symmetric and Asymmetric traffic support in TD-SCDMA
The variable allocation of the time slots for uplink or downlink traffic is what allows TD-
SCDMA to support asymmetric traffic requirements and a variety of users. Figure 2-1
illustrates this principle where for symmetric traffic, the time slots are equally split and
for asymmetric traffic the DL can use more time slots.
2.2.
TD-SCDMA Frame Hierarchy
TD-SCDMA uses both unique codes and time signatures to separate the users in a given
cell. The standard defines a very specific frame structure as shown in Figure 2-2. There
are three different layers: the radio frame, the sub-frame and the individual time slots.
Depending on the resource allocation, the configuration of the radio frames becomes
different. The radio frame is 10ms; the sub-frame is 5 ms in length and is divided into 7
slots. The standard also specifies various ratios for the number of slots between these two
groups in order to meet specific traffic requirements. All physical channels require a
guard symbol in every time slot [6].
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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