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参数资料
| 型号： | HFA3863 |
| 厂商： | Intersil Corporation |
| 元件分类： | 基带处理器 |
| 英文描述： | Direct Sequence Spread Spectrum Baseband Processor(直接序列扩谱基带处理器) |
| 中文描述： | 直接序列扩频基带处理器（直接序列扩谱基带处理器） |
| 文件页数： | 21/39页 |
| 文件大小： | 305K |
| 代理商： | HFA3863 |
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4-21
Signal Quality Estimate
A signal quality measure is available on CR51 for use by the
MAC. This measure is the SNR in the carrier tracking loop
and can be used to determine when the demodulator is
working near to the noise floor and likely to make errors.
Figure 17 shows the performance of the SQ measure versus
signal to noise level.
ED Threshold
The performance of the ED threshold is shown in Figure 18.
Setting this threshold will effect CCA only. Using ED as part
of the CCA measure will allow deferral to large signals even
if they are not correlated to the desired spread signals.
ED can be read from CR61 bit 4. Using ED and RSSI can
assist the MAC in determining the presence of non
correlating signals such as frequency hoppers or microwave
ovens. For example, the MAC can elect to try to transmit
over microwave oven interference but not count the results in
rate shifting algorithms.
A Default Register Configuration
TheregistersintheHFA3863areaddressedwith7-bitnumbers
where the lower 1 bit of an 8-bit hexadecimal address is left as
unused. This results in the addresses being in increments of 2
as shown in the table below. Table 9 shows the register values
for a default 802.11 configuration with various rate
configurations. The data is transmitted as either DBPSK,
DQPSK, or CCK depending on the configuration chosen. It is
recommended that you start with the simplest configuration
(DBPSK) for initial test and verification of the device and/or the
radio design. The user can later modify the CR contents to
reflect the system and the required performance of each
specific application.
-100
-80
-60
-40
-20
0
120
100
80
60
40
20
0
SIGNAL LEVEL IN dBm
R
RSSI
FIGURE 16. RSSI vs SIGNAL LEVEL
-10
-5
0
5
10
15
20
25
0
10
20
30
40
50
60
70
80
90
100
SNR IN THE SPREAD BANDWIDTH AT 1Mbps
PER
MEAN
STDDEV
FIGURE 17. SIGNAL QUALITY MEASURE AND PER vs SNR
40
20
10
0
-100
20
10
30
40
30
E
SNR IN SPREAD BANDWIDTH
STARTS MISSING
MISSING
FIGURE 18. ED THRESHOLD vs SNR IN dB AT 1Mbps
HFA3863
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相关代理商/技术参数 |
参数描述 |
|---|---|
| HFA3863IN | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Direct Sequence Spread Spectrum Baseband Processor |
| HFA3863IN96 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Direct Sequence Spread Spectrum Baseband Processor |
| HFA3925 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:null2.4GHz - 2.5GHz 250mW Power Amplifier |
| HFA3925IA | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Harris Corporation 功能描述: |
| HFA3925IA1K | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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