What are the types of spread spectrum?
There are four generic types of spread spectrum signals:
- Direct Sequence (DS) – The carrier of a DS source stays at a fixed frequency. Narrowband information is spread out into a much larger bandwidth using a pseudo-random chip sequence.
- Pseudo noise (PN)
- Frequency Hopping (FHA)
- Linear Frequency Modulation (chirp)
What is spread spectrum define all type of SS?
Spread-spectrum (SS) technology uses a sequential noise-like signal to spread the normally narrowband information signal over a relatively wide band of radio frequencies. Lower transmitted power density means that other SS signals can occupy the same band, with little or no interference.
What is FHSS and DSSS?
Two popular methods for using the spread spectrum are frequency-hopping spread spectrum (FHSS) and direct-sequence spread spectrum (DSSS). FHSS splits the available spectrum into separate bands. DSSS, in contrast, spreads the signal across a wider bandwidth than FHSS, creating a lower power density across the spectrum.
Which of the following is spread spectrum technique?
Explanation: A direct sequence spread spectrum (DS-SS) system spreads the baseband data by directly multiplying the baseband data pulses with a pseudo noise sequence. And the pseudo noise sequence is produced by a pseudo noise code generator.
Why spread spectrum is used?
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. These spread spectrum signals transmit at low power density and has a wide spread of signals.
What is meant by direct sequence spread spectrum?
Direct-Sequence Spread Spectrum: A transmission technology used in WLAN (wireless LAN) transmissions where a data signal at the sending station is combined with a higher data-rate bit sequence, or chipping code, that divides the user data according to a spreading ratio.
What is the principle of spread spectrum?
The core principle of spread spectrum is the use of noise-like carrier waves, and, as the name implies, bandwidths much wider than that required for simple point-to-point communication at the same data rate. Resistance to jamming (interference).