What is Direct Sequence Spread Spectrum?
In telecommunications, direct-sequence spread spectrum (DSSS) is a spread-spectrum modulation technique primarily used to reduce overall signal interference. … With DSSS, the message bits are modulated by a pseudorandom bit sequence known as a spreading sequence.
What is DSSS and FHSS?
FHSS and DSSS, which stand for Frequency Hopping Spread Spectrum and Direct Sequence Spread Spectrum, are two spread spectrum techniques. The main difference is in how they spread the data into the wider bandwidth. FHSS utilizes frequency hopping while DSSS utilizes pseudo noise to modify the phase of the signal.
What are the applications of DSSS?
Direct sequence spread spectrum (DS-SS) technique is widely used in modern telecommunications and it represents the latest advancement in radio control systems. In this paper we present an application of DS-SS technique for unmanned aerial vehicle (UAV) pulse position modulation (PPM) control signal protection.
What are the two types of spread spectrum techniques?
There are two predominant techniques to spread the spectrum: 1) Frequency hoping (FH), which makes the narrow band signal jump in random narrow bands within a larger bandwidth. 2) Direct sequence (DS) which introduces rapid phase transition to the data to make it larger in bandwidth.
What is spread spectrum Technology explain the FHSS and DSSS techniques for spreading the spectrum?
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. … FHSS is used to avoid interference, to prevent eavesdropping, and to enable code-division multiple access (CDMA) communications.
Why we use the spread spectrum techniques and explain the DSSS concepts and its types?
The Direct Sequence Spread Spectrum (DSSS) is a spread-spectrum modulation technique primarily used to reduce overall signal interference in telecommunication. The Direct Sequence Spread Spectrum modulation makes the transmitted signal wider in bandwidth than the information bandwidth.
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. … These spread spectrum signals transmit at low power density and has a wide spread of signals.
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.