- What is DSSS technique?
- How can spreading be achieved?
- Which circuit uses frequency hopping?
- Which is better FHSS or DSSS?
- What frequencies does WiFi use?
- What is frequency hopping in LTE?
- What is Frequency Hopping Multiple Access?
- Which frequency has more attenuation 2.4 GHz or 5GHz?
- What is frequency hopping used for?
- Does WIFI use frequency hopping?
- How frequency hopping is used for security in Bluetooth?
- What is frequency hopping in GSM?
- Does Bluetooth use the same frequency as WiFi?
- Which is more simpler to implement?
- Is Bluetooth line of sight?
- What is hopping in telecom?
- What is fast frequency hopping?
- What is the frequency and maximum data rate for 802.11 a?
- What frequency is 5g?
What is DSSS technique?
In telecommunications, direct-sequence spread spectrum (DSSS) is a spread-spectrum modulation technique primarily used to reduce overall signal interference.
Each spreading-sequence bit, which is known as a chip, has a much shorter duration (larger bandwidth) than the original message bits..
How can spreading be achieved?
Answer: The spreading can be achieved by two different ways. (3 points)Direct sequence spread spectrum (DSSS): The DSSS system take a user bit stream and perform an (XOR) with a so-called chipping sequence. For each user bit with duration tb, a chip sequence with a smaller duration tc for each chip.
Which circuit uses frequency hopping?
1 is known as Bluetooth , which uses Frequency Hopping Spread Spectrum (FHSS) . In FHSS the message signal is transmitted by rapidly switching among many frequency channels, using a pseudorandom sequence known to both transmitter and receiver.
Which is better FHSS or DSSS?
DSSS, in contrast, spreads the signal across a wider bandwidth than FHSS, creating a lower power density across the spectrum. … Because FHSS allows more channels in the same frequency band, FHSS systems can support a greater aggregate bandwidth for coverage.
What frequencies does WiFi use?
(The higher the frequency, the faster the data transmission and shorter the signal range.) WiFi frequency bands are frequency ranges within the wireless spectrum that are designated to carry WiFi: 2.4 GHz and 5 GHz.
What is frequency hopping in LTE?
Frequency hopping is one of the techniques that can be used to improve the uplink performance by providing frequency diversity and interference averaging. The hopping can be between subframes (inter-subframe) or within a subframe (intra- subframe).
What is Frequency Hopping Multiple Access?
Spread-spectrum transmission technology that enables simultaneous data or voice communications to share the same communication medium by causing transmitting and receiving stations to change the frequency rapidly in a pseudorandom sequence among many discrete radio channels.
Which frequency has more attenuation 2.4 GHz or 5GHz?
The primary difference between the 2.4 GHz and 5GHz wireless frequencies is range as the 2.4GHz frequency is able to reach farther than the 5GHz frequency. This is a result of the basic characteristics that waves attenuate much faster at higher frequencies. … 2.4GHz suffers more interference than 5GHz.
What is frequency hopping used for?
Frequency Hopping Spread Spectrum (FHSS) is a method used to rapidly switch transmitting radio signals among several frequency channels. The FCC has certain regulations in place with which RFID readers must comply in order to transmit 1 W of output power. The FCC allows high output power if the system: Uses FHSS.
Does WIFI use frequency hopping?
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.
How frequency hopping is used for security in Bluetooth?
Bluetooth devices use AFH (adaptive frequency hopping) to hop among 79 frequencies at 1 MHz intervals to give a high degree of interference immunity. What is Frequency-Hopping Spread Spectrum (FHSS)? … The transmitter switches hop frequencies 1,600 times per second to assure a high degree of data security.
What is frequency hopping in GSM?
Frequency hopping is the technique of improving the signal to noise ratio in a link by adding frequency diversity. … In a GSM/GPRS/EGPRS network, frequency hopping is specified in individual cells based on the number of frequencies offered by a specific cell.
Does Bluetooth use the same frequency as WiFi?
4. Bluetooth vs. WiFi – . Frequency: Bluetooth works at 2.4GHz frequency while Wi-Fi based networks work at 2.4, 3.6 and 5 GHz .
Which is more simpler to implement?
5. Which is more simpler to implement? Explanation: Direct sequence spread spectrum is more simpler to implement.
Is Bluetooth line of sight?
Bluetooth requires a “line of sight” for radio waves. The radio frequencies used by Bluetooth travel in a straight line – but they can travel through SOME substances that we cannot see through.
What is hopping in telecom?
In telecommunication, a hop is a portion of a signal’s journey from source to receiver. Examples include: The excursion of a radio wave from the Earth to the ionosphere and back to the Earth. The number of hops indicates the number of reflections from the ionosphere.
What is fast frequency hopping?
A receive hopping between frequency in synchronization with the transmitter, piece of the message signal attain to ‘jam’. It is a method of transmitting radio signal by radio rapidly switching a carrier among many frequency channels, using a pseudorandom sequence known to both transmitter and receiver.
What is the frequency and maximum data rate for 802.11 a?
Different Wi-Fi Protocols and Data RatesProtocolFrequencyMaximum data rate (theoretical)802.11g2.4 GHz54 Mbps802.11a5 GHz54 Mbps802.11b2.4 GHz11 MbpsLegacy 802.112.4 GHz2 Mbps4 more rows
What frequency is 5g?
The 5G frequency band plans are much more complex, as the frequency spectrum for sub-6 GHz 5G spans 450 MHz to 6 GHz, and millimeter-wave 5G frequencies span 24.250 GHz to 52.600 GHz, and also include unlicensed spectrum. Additionally, there may be 5G spectrum in the 5925 to 7150 MHz range and 64 GHz to 86 GHz range.