- 您现在的位置：买卖IC网 > PDF目录371807 > HFA3863 (Intersil Corporation) Direct Sequence Spread Spectrum Baseband Processor(直接序列扩谱基带处理器) PDF资料下载
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： | 20/39页 |
| 文件大小： | 305K |
| 代理商： | HFA3863 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页当前第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页
4-20
performance of the CCK modes. The losses in both figures
include RF and IF radio losses; they do not reflect the
HFA3863 losses alone. The HFA3863 baseband
processing losses from theoretical are, by themselves, a
small percentage of the overall loss.
The PRISM demodulator performs with an implementation
loss of less than 4dB from theoretical in a AWGN
environment with low phase noise local oscillators. For the
1 and 2Mbps modes, the observed errors occurred in
groups of 4 and 6 errors. This is because of the error
extension properties of differential decoding and
descrambling. For the 5.5 and 11Mbps modes, the errors
occur in symbols of 4 or 8 bits each and are further
extended by the descrambling. Therefore the error patterns
are less well defined.
Clock Offset Tracking Performance
The PRISM baseband processor is designed to accept data
clock offsets of up to
±
25ppm for each end of the link (TX
and RX). This effects both the acquisition and the tracking
performance of the demodulator. The budget for clock offset
error is 0.75dB at
±
50ppm. No appreciable degradation was
seen for operation in AWGN at
±
50ppm. Symbol tracking is
accomplished by one of two methods. If both ends of the link
employ locked oscillators for their bit timing and carrier
frequency generation, symbol tracking is done by dividing
down the carrier frequency offset. If either one of the ends of
the link do not have locked oscillators, then symbol tracking
is done by a conventional early-late chip tracking method.
Carrier Offset Frequency Performance
The correlators used for acquisition for all modes and for
demodulation in the 1 and 2Mbps modes are time invariant
matched filter correlators otherwise known as parallel
correlators. They use two samples per chip and are tapped
at every other shift register stage. Their performance with
carrier frequency offsets is determined by the phase roll rate
due to the offset. For an offset of +50ppm (combined for both
TX and RX) will cause the carrier to phase roll 22.5 degrees
over the length of the correlator. This causes a loss of
0.22dB in correlation magnitude which translates directly to
Eb/N0 performance loss. In the PRISM chip design, the
carrier phase locked loop is inactive during acquisition.
During tracking, the carrier tracking loop corrects for offset,
so that no degradation is noted. In the presence of high
multipath and high SNR, however, some degradation is
expected.
RSSI Performance
The RSSI value is reported on CR62 in hex and is linear with
signal level in dB. Figure 16 shows the RSSI curve
measured on a whole evaluation radio. This takes into
account the full gain adjust range of all radio parts. To get
signal level in dBm on a radio, simply subtract the RSSI
value in decimal from 100.
FIGURE 14. BER vs Eb/N0 PERFORMANCE FOR PSK MODES
FIGURE 15. BER vs Eb/N0 PERFORMANCE FOR CCK MODES
7
8
9
10
11
12
Eb/N0
1.E+00
B
1.E-03
1.E-04
1.E-05
1.E-07
1.E-08
1.E-02
1.E-06
1.E-01
BER 1.0
BER 2.0
THY 1, 2
14
13
12
11
10
9
8
7
6
5
B
Eb/N0
1.E+00
1.E-03
1.E-04
1.E-05
1.E-07
1.E-08
1.E-02
1.E-06
1.E-01
1.E-09
BER 11
BER 5.5
THY 5.5
THY 11
HFA3863
相关PDF资料 |
PDF描述 |
|---|---|
| HFA3983IV96 | 2.4GHz Power Amplifier and Detector |
| HFA3983 | 2.4GHz Power Amplifier and Detector(2.4GHz 功率放大器探测器) |
| HFA3983IV | 2.4GHz Power Amplifier and Detector |
| HFB60HF20 | 200V 60A Hi-Rel Ultra-Fast Discrete Diode in a SMD-1 package |
| HFB60HF20C | 200V 60A Hi-Rel Ultra-Fast Common Cathode Diode in a SMD-1 package |
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 |
发布紧急采购，3分钟左右您将得到回复。