ScienTECH ST2115, Руководство пользователя

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ST2115
Scientech Technologies Pvt. Ltd. 30
1. Carrier Generator :
This carrier generator generates a sinusoidal carrier of 1.44MHz frequency.
2. Direct Sequence Spread Spectrum Generator :
This block spread the binary data or any input data using PN code by Ex-
ORing them together.
3. BPSK Modulator :
BPSK modulator modulates the chipped data for making it suitable for
transmission. This modulator accepts only bipolar signals as inputs. So a
Unipolar to bipolar converter is also provided on the board
4. BPSK Demodulator :
The demodulation process accompanies carrier recovery, switching and
filtering processes. For proper demodulation, phase adjust is also provided on
the board.
5. Comparator :
Comparator shape up filter output of BPSK demodulator. The threshold bias is
adjustable.
6. Data Recovery block :
Data recovery block Ex-or the received chipped data with the “synchronized
PN Sequence for despreading” to recover original data.
7. Pulse Width Modulator :
This modulator is provided for converting audio signal into pulse signal, so
that we can transmit and recover audio signal using direct sequence spread
Spectrum Technique.
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