參數(shù)資料
型號(hào)： MC145426
廠商： Motorola, Inc.
英文描述： Universal Digital-Loop Transceiver
中文描述： 通用數(shù)字環(huán)路收發(fā)器
文件頁(yè)數(shù)： 15/20頁(yè)
文件大?。?/td> 261K
代理商： MC145426
MC145422
MC145426
MOTOROLA
15
Both the Differential–Phase Shift Keying and the Modified
Differential–Phase–Shift Keying waveforms are shown in
Figures 12 thru 14. The DPSK encodes data as phase rever-
sals of a 256 kHz carrier. A 0 is indicated by a 180
°
phase
shift between bit boundaries, while the signal continues in
phase to indicate a 1. This method needs no additional bits
to indicate the start of the burst.
The modified DPSK waveform actually used in the trans-
ceivers is a slightly modified form of DPSK, as shown in Fig-
ure 12. The phase–reversal cusps of the DPSK waveform
have been replaced by a 128 kHz half–cycle to lower the
spectral content of the waveform, which, save for some key
differences, appears quite similar to frequency shift keying.
The burst always begins and ends with a half–cycle of
256 kHz, which helps locate bit boundaries.
The bit pattern shown in Figure 13a shows a stable wave-
form due to the even number of phase changes or zeros. The
waveform shown in Figure 13b shows random data patterns
being modulated.
Figure 14 shows the “ping–pong” signals on 3000 feet of
26 AWG twisted–pair wire as viewed at LI of the master
UDLT and the slave UDLT.
DIFFERENTIAL–PHASE–SHIFT KEYING
MODIFIED DIFFERENTIAL–PHASE–SHIFT KEYING
1
1
1
1
1
0
0
0
0
0
Figure 12. Modified Differential Phase Shift Keying
13a. Bit Pattern — 1010101000
13b. Bit Pattern — Random
Figure 13. Typical Signal Waveforms at Demodulator
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