What are spread spectrum techniques?

What are spread spectrum techniques?

Spread-Spectrum techniques are methods by which a signal (e.g. an electrical, electromagnetic, or acoustic signal) generated with a particular bandwidth is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth.

What are the two types of spread spectrum techniques?

Spread Spectrum can be categorized into two types:

  • Frequency Hopping Spread Spectrum (FHSS)
  • Direct Sequence Spread Spectrum(DSSS)

What is Spread Spectrum PPT?

Spread Spectrum signals use fast codes that run many times the information bandwidth or data rate. These special “Spreading” codes are called “Pseudo Random” or “Pseudo Noise” codes.

What are the applications of spread spectrum techniques?

Current applications of spread spectrum technology include wireless LANs (local area networks), bar code scanners, and microphones. This technology improves the efficiency and effectiveness of business processes, many of which are finding that wireless communications are requisite for success.

What are the different techniques of spread spectrum?

There are four techniques of spread spectrum namely direct sequence spread spectrum (DSSS), frequency hopping spread spectrum (FHSS), chirp spread spectrum (CSSS) and time hopping spread spectrum (THSS).

How is spread spectrum used in band pass communication?

Spread spectrum is a band pass communication. At the modulator end, the information signal bandwidth is spreaded by multiplying by spreading signal. The demodulator then multiplies the signal that is received by the same spreading signal and then recovers the original signal by filtering.

What are the advantages of spread spectrum modulation?

The main advantage of spread spectrum communication technique is to prevent “interference” whether it is intentional or unintentional. The signals modulated with these techniques are hard to interfere and cannot be jammed. An intruder with no official access is never allowed to crack them. Hence, these techniques are used for military purposes.

How is time hopping used in spread spectrum?

Frequency Hopping (FH) – A carrier frequency is shifted in discrete increments in a pattern dictated by a code sequence. Time Hopping (TH) – Bursts of the carrier signal are initiated at times dictated by a code sequence. Hybrid Systems – Use of combination of the above.