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What is the technology behind CDMA and gsm?
tdma and fdma
Why is TDMA better than FDMA?
In CDMA all the stations can sends data simultaneously. But in FDMA only one channel occupies the entire bandwidth of the link so each channel can be assigned to only one user at a time. So CDMA is better than FDMA.
What is the basic difference between ofdma and sc-fdma?
The basic difference between OFDMA and SC-FDMA is that, there there is an additional block of N point DFT before the sub-channel mapping in SC-FDMA. This will effectively reduce the PAPR, thus the power amplifier will have a lesser linear range in SC-FDMA when compared with OFDMA
What is the difference between frequency division multiplexing and freq division multiple access?
The basic difference between fdm and fdma is that fdm is used in wired system where as fdma is used in wireless communication.
What is the difference between 1G 2G 3G generations of wireless communication?
1G is based on frequency modulation,analog technology,TDMA 2G is based on digital technology,FDMA 3G is based on CDMA which is a faster internet access source
What is the most striking difference between GSM and CDMA technology?
Hand off
What is da-fdma?
da-fdma
Difference between CDMA 800 and CDMA 1900?
- CDMA800 (low band) is at freq 800MHz whereas CDMA1900 (high band) is at 1900MHz. - TX power of CDMA800 is lower than the CDMA1900.
What is the difference between unlocking a phone and flashing a phone?
Unlocking usually refers to a GSM network and flashing usually refers to CDMA networks. When you unlock a phone you can use it on any carrier that uses the same radio (GSM/CDMA), or if you have a world phone, either a GSM or CDMA. Flashing the phone just allows you to use one specific CDMA carrier.
What the difference between the Nexus S and the Nexus S4G?
The Nexus S 4G is a CDMA phone and the Nexus S is a GSM Phone. This is the basic difference between these two phones. Most of the remaining configurations are same.
Why FDMA is not sensitive to near- far problems?
A frequency-division multiple access system (FDMA) is much less sensitive to near-far problems than code-division multiple access systems (CDMA). A FDMA receiver must select signals from a desired transmitter tuned to one frequency, and block signals from transmitters tuned to other frequencies -- this is fairly easy and low-cost to do with standard bandpass filters, even when the near-far problem causes undesired transmitters to sound much louder than the desired transmitter, as long as adequate "guard bands" separate one transmitter from the next. A DSS CDMA receiver must select signals from a desired transmitter and block signals from other transmitters, even when they are all transmitting on the same frequencies at the same time -- this cannot be done with standard bandpass filters. The techniques DSS CDMA receivers use to select the desired signals are much more sensitive to near-far problems.
What is Frequency-division multiple access in satellite communication?
In FDMA all users share the satellite simultaneously but each user transmits at single frequency.FDMA can be used with both analog and digital signal.FDMA requires high-performing filters in the radio hardware, in contrast to TDMA and CDMA
