DSSS SYSTEM

DSSS System Introduction:

It stands for Direct Spread Spectrum System.

Its a modulation technique that takes a signal centerd around one frequency and spread it out over others.

This is Design to lower the effect of noise make it difficult to jam and as well as to intercept.

Spread spectrum techniques use pseudo noise to transmit the signal.

For Spread spectrum both the receiver and transmitter point need the ability to generate pseudo noise signal.

DSSS TRANSMISSION

A data signal is generated and enters in a spreader.

Inside the spreader, a pseudo noise signal is generated and xored with data signal.

D(t) Xor N(t) = Sd(t)

The new signal is then modulated with an analog technique such as BPSK .

DSSS RECEPTION

Once the data is received, it is again demodulated and then send into a despreader to poduce original signal.

*Sd(t) XOR N(t) = D(t)

Each data bit is combine ith a n-bit spreadind code.

Logically the combination is an XOR. It means instead of a 0 and 1 data signal -1 and 1 are used.

Submitted By : Suyash Srivastava

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