What Are The Two Types Of Spread Spectrum Techniques?

Does WIFI use spread spectrum?

Bluetooth uses Frequency Hopping Spread Spectrum (FHSS) and is allowed to hop between 79 different 1 MHz-wide channels in this band.

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..

What is jamming in spread spectrum?

What is Jamming? Jamming is a deliberate attempt to disrupt communication between the transmitter and the receiver. … Since spread spectrum signals are wide, they transmit at a much lower spectral power density, making it less likely to interfere with narrowband communications.

Why CDMA is called spread spectrum?

In Code Division Multiple Access (CDMA) systems all users transmit in the same bandwidth simultaneously. Communication systems following this concept are “spread spectrum systems”. In this transmission technique, the frequency spectrum of a data-signal is spread using a code uncorrelated with that signal.

Who invented spread spectrum?

Hedy LamarrHedy Lamarr (/ˈheɪdi/), born Hedwig Eva Maria Kiesler (November 9, 1914 – January 19, 2000), was an Austrian-American actress, inventor, and film producer. She was part of 30 films in an acting career spanning 28 years, and co-invented an early version of frequency-hopping spread spectrum.

What are 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 direct sequence spread spectrum technique?

In telecommunications, direct-sequence spread spectrum (DSSS) is a spread-spectrum modulation technique primarily used to reduce overall signal interference. The direct-sequence modulation makes the transmitted signal wider in bandwidth than the information bandwidth.

Where is Spread Spectrum used?

We will focus on Direct Sequence Spread Spectrum technique since it is the mostly used in the industry (CDMA, UMTS, 802.11, GPS).

What are the main benefits of spread spectrum system?

A benefit of spread spectrum technology is its ability to work at low spectral density levels when compared to narrow bandwidth services, enabling smaller antennas while overcoming adjacent satellite interference and increasing communications link security.

What spectrum means?

A spectrum (plural spectra or spectrums) is a condition that is not limited to a specific set of values but can vary, without steps, across a continuum. The word was first used scientifically in optics to describe the rainbow of colors in visible light after passing through a prism.

What are the types of spread spectrum?

Chapter three describes different techniques of spread spectrum. There are four techniques of spread spectrum namely direct sequence spread spectrum (DSSS), frequency hopping spread spectrum (FHSS), chirp spread spectrum (CSSS) and time hopping spread spectrum (THSS).

What is Spread Spectrum and its types?

Spread spectrum multiple access techniques uses signals which have a transmission bandwidth of a magnitude greater than the minimum required RF bandwidth. These are of two types. Frequency Hopped Spread Spectrum FHSS. Direct Sequence Spread Spectrum DSSS.

What is PN sequence?

Theory: Pseudo-Noise (PN) sequences are commonly used to generate noise that is approximately “white”. It has applications in scrambling, cryptography, and spread-spectrum communications. It is also commonly. referred to as the Pseudo-Random Binary Sequence (PRBS). These are very widely used in communication.