參數(shù)資料
型號： HFA3860IV
廠商： HARRIS SEMICONDUCTOR
元件分類： 無繩電話/電話
英文描述： 11 Mbps Direct Sequence Spread Spectrum Baseband Processor
中文描述： TELECOM, CELLULAR, BASEBAND CIRCUIT, PQFP48
文件頁數(shù)： 25/40頁
文件大?。?/td> 250K
代理商： HFA3860IV
4-25
differential decoding and descrambling. For the 5.5 and 11
MBps 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 and the performance is shown in
Figure 17. This figure shows that the baseband processor in
the high rate modes is better than at low rates in tracking
clock offsets. The data for Figure 17 and Figure 18 was
taken with the SNR into the receiver set to achieve 1E
-5
BER
with no offset. Then the offset was varied to determine the
change in performance.
Carrier Offset Frequency Performance
The correlators used for acquisition for all modes and for
demodulation in the 1 and 2 MBps 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 correlator is
not included in the carrier phase locked loop correction, so
this loss occurs for both acquisition and data. In the high rate
modes, the data demodulation is done with a set of correlators
that are included in the carrier tracking loop, so the loss is
less. Figure 18 shows the loss versus carrier offset taken out
to +50ppm (120kHz is 50ppm at 2.4GHz).
5
6
7
8
9
10
11
12
13
14
EB/N0
1.E
-02
B
1.E
-03
1.E
-04
1.E
-05
1.E
-06
1.E
-07
FIGURE 15. BER vs EB/N0 PERFORMANCE FOR PSK MODES
BER 2.0
BER 1.0
THY 1,2
FIGURE 16. BER vs EB/N0 PERFORMANCE FOR MBOK MODES
14
13
12
11
10
9
8
7
6
5
B
1.E-03
1.E-04
1.E-05
1.E-06
1.E-07
Eb/N0
THY 5.5
THY 11
BER 5.5
BER 11
FIGURE 17. BER vs CLOCK OFFSET
-100
-80
-60
-40
-20
0
20
40
60
80 100
1.00E
-03
1.00E
-04
1.00E
-05
1.00E
-06
1.00E
-07
B
BER 1.0
BER 2.0
BER 5.5
BER 11
CLOCK OFFSET (PPM)
HFA3860
相關(guān)PDF資料
PDF描述
HFA3860IV96 11 Mbps Direct Sequence Spread Spectrum Baseband Processor
HFA3861A Direct Sequence Spread Spectrum Baseband Processor(直接序列擴(kuò)頻基帶處理器)
HFA3861B Direct Sequence Spread Spectrum Baseband Processor(直接序列擴(kuò)譜基帶處理器)
HFA3861 Direct Sequence Spread Spectrum (DSSS) baseband processor(直接序列擴(kuò)頻基帶處理器)
HFA3861IV Direct Sequence Spread Spectrum Baseband Processor
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HFA3860IV WAF 制造商:Harris Corporation 功能描述:
HFA3860IV96 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:11 Mbps Direct Sequence Spread Spectrum Baseband Processor
HFA3861 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Direct Sequence Spread Spectrum Baseband Processor
HFA3861A 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Direct Sequence Spread Spectrum Baseband Processo
HFA3861AIN 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Direct Sequence Spread Spectrum Baseband Processo
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