- What are the main reason for using cellular system?
- Should I disable Spread Spectrum?
- What are the two types of spread spectrum?
- Why CDMA is called spread spectrum?
- What is fast hopping?
- What is frequency hopping used for?
- Should I disable eist?
- What is Spread Spectrum with its types?
- What is DSSS technique?
- What is VRM spread spectrum?
- Which is better FHSS or DSSS?
- Who invented spread spectrum?
- What does WiFi stand for?
- What is the difference between Futaba Fasst and FHSS?
- What is SATA spread spectrum?
- What does spread spectrum do?
- What is Clock spread spectrum?
- Does WIFI use spread spectrum?
What are the main reason for using cellular system?
(a) What are the main reasons for using cellular systems.
Answer: (4 points) Higher capacity, higher number of the users: cellular systems can reuse spectrum according to certain patterns.
Each cell can support a maximum number of users..
Should I disable Spread Spectrum?
Generally, frequency modulation through spread spectrum clocking should not cause any problems. … Therefore, it is recommended that you disable the MCLK Spread Spectrum feature if you are overclocking the memory bus. You will be able to achieve better overclockability, at the expense of higher EMI.
What are the two types of spread spectrum?
Out of many Spread Spectrums, this report analyses the two main spread spectrum systems which are the ‘Frequency Hopping and Direct Sequence’ and in addition an overview of the ‘Chirp Spread’ Spectrum. … It is utilized as a several access method in the frequency-hopping code division multiple access scheme.
Why CDMA is called spread spectrum?
CDMA is a form of a Direct Sequence Spread Spectrum (where the transmitted data is coded at a very high frequency) communication. In spread spectrum, to send data, the signal bandwidth is much larger than necessary to support multi-user access.
What is fast hopping?
Slow and Fast Hopping In this case one or more data bits are transmitted within one hop. … One data bit is divided over multiple hops. In fast hopping, coherent signal detection is difficult, and seldom used. Mostly, FSK or MFSK modulation is used.
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.
Should I disable eist?
Ah… if you disable EIST, the computer will run a static multiplier, whatever you set for the turbo multiplier, it will stick to it. the voltage will also reflect that. If you are running a lower end CPU, this is fine. But with heavily overclocked CPUs, this isn’t advised.
What is Spread Spectrum with its types?
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 DSSS 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.
What is VRM spread spectrum?
The effect of high CPU Voltage Frequency may vary with respect to the CPU used. It is highly recommended to Enable VRM Spread Spectrum or Enable Active Frequency Mode when not intending to set the CPU Fixed Frequency to the highest level to allow less emission of electromagnetic interference or better power saving.
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.
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 does WiFi stand for?
Wireless FidelityIEEE is a separate, but related, organization and their website has stated “WiFi is a short name for Wireless Fidelity”. To connect to a Wi-Fi LAN, a computer must be equipped with a wireless network interface controller. The combination of a computer and an interface controller is called a station.
What is the difference between Futaba Fasst and FHSS?
FHSS is a less expensive and lower end frequency hoping technology. Its the same as used in FrSky/Hitec/Graupner and other systems. FASST is higher end, multiple frequency hoping and advanced technologies, better range, etc.
What is SATA spread spectrum?
This BIOS feature controls spread spectrum clocking of the Serial ATA (SATA) interface. When set to Down Spread, the motherboard modulates the Serial ATA interface’s clock signal downwards by a small amount. Because the clock signal is modulated downwards, there is a slight reduction in performance.
What does spread spectrum do?
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 Clock spread spectrum?
Spread spectrum clocking is a technique where the clock frequency is modulated slightly to lower the peak energy generated by a clock. Spread spectrum clocking lowers clock-generated EMI from both the fundamental frequency and subsequent harmonics, thereby reducing the total system EMI.
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.