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Vila
Vila • Sep 4, 2008

Coherent detector in DSSS

Hiiii alll,


Why must we use a coherent detector in direct sequence spread spectrum (DSSS) system? And is there possibility of us using other types of modulator and demodulator other then BPSK? Why must use BPSK modulator in DSSS?

Thank you...
Vila
Vila • Sep 5, 2008
[FONT=verdana, arial, helvetica]Hiiii all,

Why must we use a coherent detector in direct sequence spread spectrum (DSSS) system? Also why must specifically use BPSK modulator in DSSS? And is there possibility of us using other types of modulator and demodulator other then BPSK?
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[FONT=verdana, arial, helvetica]Thank you...[/FONT]
just2rock
just2rock • Sep 5, 2008
coherent detector is used to sysncronize the DSSS signals in a particular direction.Binary PSK is used in DSSS to manipulate the signal direction/phase shift.Other than BPSK ,we cant use any other form of Mod /demod.
Regards,
J2R
Vila
Vila • Sep 5, 2008
[FONT=verdana, arial, helvetica]Hiiii all

Where is Direct Sequence Spread Spectrum (DSSS) used?? I mean the application of DSSS.

Thank you.....
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Vila
Vila • Sep 5, 2008
Hiiiii sir,

Thanks for the explaination. What actually an interleaver does? Why it scrambles the order of data sequence? And why we need it in an anti jam communication system?

Thank you.
just2rock
just2rock • Sep 6, 2008
interleaver desync the order of data send/recieve in a communication system & to do such it must be in an anti jam condt. to fulfill its rerquirement as jamming can trigger to deorder or demod the interleaver functionality.
Regards,
J2R

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