What is spread spectrum explain it with 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 a spread spectrum transmitter?
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.
What is FHSS explain with diagram?
In a frequency-hopping spread spectrum (FHSS) system, the transmitted signal is spread across multiple channels, as shown in Figure 1 below. This baseband signal is then modulated onto a carrier c(t). Figure 1: Block diagram of FHSS transmitter, from William Stallings “Data and Computer Communications”.
What is spread spectrum and what are the types of spread spectrum?
Spread Spectrum can be categorized into two types: Frequency Hopping Spread Spectrum (FHSS) Direct Sequence Spread Spectrum(DSSS)
How is spread spectrum implemented?
Spread spectrum generally makes use of a sequential noise-like signal structure to spread the normally narrowband information signal over a relatively wideband (radio) band of frequencies. The receiver correlates the received signals to retrieve the original information signal.
What is spread spectrum techniques?
In telecommunication and radio communication, 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 is spread spectrum Technology explain the FHSS and DSSS techniques for spreading the spectrum?
Hence, these techniques are used for military purposes. These spread spectrum signals transmit at low power density and has a wide spread of signals….Comparison between FHSS and DSSS/CDMA.
| FHSS | DSSS / CDMA |
|---|---|
| Power strength of the signal is high | Power strength of the signal is low |
Where is spread spectrum used?
Spread-spectrum clock generation (SSCG) is used in some synchronous digital systems, especially those containing microprocessors, to reduce the spectral density of the electromagnetic interference (EMI) that these systems generate.
What is the block diagram of Spread Spectrum digital communication?
The block diagram of spread spectrum digital communication is shown in above fig. the basic elements of a spread spectrum digital communication system with a binary information sequence at its input at the transmitting end and its output at the receiving end.
How does a frequency hopping spread spectrum work?
Frequency-hopped spread-spectrum works by pseudorandomly changing the center frequency of the carrier over a set of frequencies. The sequence of frequencies used is called the frequency hopping pattern.
How is data modulated in a FHSS transmitter?
Figure 2 shows the block diagram of a typical FHSS transmitter. First, digital data is modulated using some digital-to-analog scheme. This baseband signal is then modulated onto a carrier c (t). Figure 1: Block diagram of FHSS transmitter, from William Stallings “Data and Computer Communications”.
How is a direct sequence signal obtained in a channel?
Unlikefrequency-hopping,a direct-sequence signal occupies the entire bandwidth continuously. The signal is obtained by starting with a narrowbandsignal and directly modulating a high bandwidth signal. As with frequencyhopping direct-sequence has advantages when the channel contains a jamming like signal.