How is the spread spectrum measured?
How is the spread spectrum measured?
Spread Spectrum Measurement with a Spectrum Analyzer The magnitude is the amount of frequency change back and forth. Figure 1 was measured with a Spectrum Analyzer. You can measure the magnitude by the width of the harmonic in the Spectrum Analyzer graph.
What does a spectrum analyzer show?
A spectrum analyzer displays a spectrum of signal amplitudes on different frequencies. It enables analysis that determines whether signals fall within required limits. It displays spurious signals, complex waveforms, rare short-duration events and noise.
What is spread spectrum?
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.
What are the 3 varieties 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)
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. An intruder with no official access is never allowed to crack them.
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.
Where is spread spectrum used?
Now, spread spectrum technology is widely used in radio signals transmission because it can easily reduce noise and other signal issues.
What are the applications and advantages of spread spectrum techniques?
Advantages and applications of spread spectrum
- Spread spectrum signals are highly resistant to the jamming.
- Many users can share a signal band with no interference.
- Unauthorized listening is prevented.
- Unintentional interference occupying the same band is greatly minimized and in most cases virtually eliminated.
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.
Why spread spectrum is used in wireless communication?
Usage of Spread Spectrum There are many reasons to use this spread spectrum technique for wireless communications. The following are some reasons: It can successfully establish a secure medium of communication. It can increase the resistance to natural interference, such as noise and jamming, to prevent detection.