What is spread spectrum explain it with a diagram?
Spread Spectrum refers to a system originally developed for military applications, to provide secure communications by spreading the signal over a large frequency band. Figure 1 represents a narrow band signal in the frequency domain. These narrowband signals are easily jammed by any other signal in the same band.
What is spread spectrum modulation technique?
A collective class of signaling techniques are employed before transmitting a signal to provide a secure communication, known as the Spread Spectrum Modulation. The main advantage of spread spectrum communication technique is to prevent “interference” whether it is intentional or unintentional.
What is spread spectrum explain with diagram FHSS?
Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly changing the carrier frequency among many distinct frequencies occupying a large spectral band. The changes are controlled by a code known to both transmitter and receiver.
Which Following is the main characteristics of spread spectrum?
Explanation: Spread spectrum techniques employ a transmission bandwidth that is several orders of magnitude greater than the minimum required signal bandwidth. On the other hand, primary objective of all the modulation schemes is to minimize the required transmission bandwidth. 17.
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 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).
Why spread spectrum is used in wireless communication?
Spread spectrum is a form of wireless communications in which the frequency of the transmitted signal is deliberately varied. This results in a much greater bandwidth than the signal would have if its frequency were not varied.
Why spread spectrum technique is inefficient for a single use what are the applications and advantages of spread spectrum techniques?
Why spread spectrum technique is inefficient for a single user? Explanation: Spread spectrum systems are bandwidth inefficient for single users. But in spread spectrum systems, many users can simultaneously use the same bandwidth without significantly interfering with one another.
What is spread spectrum What are its advantages?
What Is the Spread Spectrum Technique? In the spread spectrum technique, the frequency of the signal to be transmitted is varied by injecting pseudo-random noises into it. This injection increases the bandwidth of signal transmission, and thereby reduces the effects of interference, noise, and signal fading.
What are the advantages of spread spectrum transmissions?
Increase in operating distances: Spread spectrum modulated signals possess non-interference properties and have higher transmit power. With these higher transmit power capabilities, spread spectrum signals can be transmitted to longer distances compared to analog wireless communication.
What is spread spectrum modulation?
The definition of Spread – Spectrum modulation may be stated in two parts. 1. Spread Spectrum is a mean of transmission in which the data sequence occupies a BW (Bandwidth) in excess of the minimum BW necessary to transmit it. 2.
How do you demodulate spread spectrum?
The signal which is spread spectrum, can be demodulated only by a code used for transmission. By using this, the transmission signal of each user can be identified by the separate code when it receives the signal. In the given example, the spread signal of the user A at the code A, and diffused signal of user B at code B.
What are the features of spread spectrum signals?
Power density is high. Spread of energy is low and concentrated. Though the features are good, these signals are prone to interference. The spread spectrum signals have the signal strength distributed as shown in the following frequency spectrum figure. Band of signals occupy a wide range of frequencies.
What are multiple access techniques in spread spectrum?
With these features, the spread spectrum signals are highly resistant to interference or jamming. Since multiple users can share the same spread spectrum bandwidth without interfering with one another, these can be called as multiple access techniques.