Why spread spectrum is used in communication?

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 are the different 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 are the applications of spread spectrum?

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 spread spectrum technology is used for mobile cellular communication?

Code division multiple access (CDMA) is a form of spread spectrum communications that is being used for, among other applications, some second-generation cellular phone systems (others use TDMA).

Why CDMA is called spread spectrum?

To permit this without undue interference between the users, CDMA employs spread spectrum technology and a special coding scheme (where each transmitter is assigned a code). CDMA optimizes the use of available bandwidth as it transmits over the entire frequency range and does not limit the user’s frequency range.

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.

How can spreading be achieved?

Answer: The spreading can be achieved by two different ways. (3 points)Direct sequence spread spectrum (DSSS): The DSSS system take a user bit stream and perform an (XOR) with a so-called chipping sequence. For each user bit with duration tb, a chip sequence with a smaller duration tc for each chip.

Which of the following are the advantages of spread spectrum?

Explanation: Advantages of spread spectrum are low susceptibility, reduced interference, immunity to jamming and co existence of multi path system. 2. Processing gain is the ratio of message bandwidth to signal bandwidth.

Is WIFI spread spectrum?

Wi-Fi uses Direct Sequence Spread Spectrum (DSSS) instead of FHSS. Its carrier does not hop or change frequency and remains centered on one channel that is 22 MHz-wide. While there is room for 11 overlapping channels in this 83 MHz-wide band, there is only room for three non-overlapping channels.

Which technique is most popular for spread spectrum?

Direct or Hopping Direct sequence and frequency hopping are the most commonly used methods for the spread spectrum technology.

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).