Question What is the difference between TDMA and FDMA. Question Submitted By :: Santosh

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   Re: What is the difference between TDMA and FDMA.

Answer# 1

TDMA is nothing but Time division multiple access. In this each user in the channel owns the channel bandwidth for some time in a round robin fashion.All GSM handsets use this technology.FDMA means Frequency division multiple access. In this many users are allowed to transmit thru the same channel at the same time. They use part of the Bandwidth. CDMA handsets use this technology. 

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  Re: What is the difference between TDMA and FDMA.Answer

# 2TDMATime division multiple access (TDMA) is a channel access method for shared medium (usually radio) networks. It allows several users to share the same frequency channel by dividing the signal into different time slots. The users transmit in rapid succession, one after the other, each using his own time slot. This allows multiple stations to share the same transmission medium (e.g. radio frequency channel) while using only a part of its channel capacity.

3 Amit Arora

TDMA is used in the digital 2G cellular systems such as Global System for Mobile Communications (GSM), IS-136, Personal Digital Cellular (PDC) and iDEN, and in the Digital Enhanced Cordless Telecommunications (DECT) standard for portable phones. It is also used extensively in satellite systems, and combat-net radio systems.

FDMAFrequency Division Multiple Access or FDMA is a channel access method used in multiple-access protocols as a channelization protocol. FDMA gives users an individual allocation of one or several frequency bands, allowing them to utilize the allocated radio spectrum without interfering with each other. Multiple Access systems coordinate access between multiple users. The users may also share access via different methods such TDMA, CDMA, or SDMA. These protocols are utilized differently, at different levels of the theoretical OSI model.

FeaturesFDMA requires high-performing filters in the radio hardware, in contrast to TDMA and CDMA. FDMA is not vulnerable to timing problems as TDMA. Since a predetermined frequency band is

available for the entire period of communication, stream data (a continuous flow of data that may not be packetized) can easily be used with FDMA. Due to the frequency filtering, FDMA is not sensitive to near-far problem which is pronounced for CDMA. 

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  Re: What is the difference between TDMA and FDMA.Answer

# 3TDMA basically is time division multiple access technique where the information is sent according to the time slots given to the subscribers,no one other then that cannot use that b.w at that time slot.

FDMAis frequency division multiple access technique where the the data is spread over whole band width and according to the frequency ranges the message is delivered 

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0 Tarun Kumar

 

  Re: What is the difference between TDMA and FDMA.Answer

# 4TDMA is Time Division Multiplexing in which the user send the information in the given time slot.untill the information is send to yhe receiver the next user cannot

0 Shilpa

use that channel.FDMA is frequency division multiplexing in which the data can be send simultaneusly. 

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  Re: What is the difference between TDMA and FDMA.Answer

# 5TDMA is nothing but Time division multiple access. In this each user in the channel owns the channel bandwidth for some time in a round robin fashion.All GSM handsets use this technology.FDMAis frequency division multiple access technique where the the data is spread over whole band width and according to the frequency ranges the message is delivered 

TDMA:Time division multiple access (TDMA) is a channel access method for shared medium (usually radio) networks. It allows several users to share the same frequency channel by dividing the signal into different time slots. The users transmit in rapid succession, one after the other, each using his own time slot. This allows multiple stations toshare the same transmission medium (e.g. radio frequency channel) while using only a part of its channel capacity. TDMA is used in the digital 2G cellular systems such as Global System for Mobile Communications (GSM), IS-136, Personal Digital Cellular (PDC) and iDEN, and in the Digital Enhanced Cordless Telecommunications (DECT)standard for portable phones. It is also used extensively in satellite systems, and combat-net radio systems.

FDMA:Frequency Division Multiple Access or FDMA is a channel access method used in multiple-access protocols as a channelization protocol. FDMA gives users an individual allocation of one or several frequency bands, allowing them to utilize the

allocated radio spectrum without interferingwith each other. Multiple Access systems coordinate access between multiple users. The users may also share access via different methods such TDMA, CDMA, or SDMA. These protocolsare utilized differently, at different levels of the theoretical OSI model.

TDMA provides many users to access the same frequency channel but different time slots.In FDMA provides many users can be used different frequency channel but at same time.

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TDMA:Time division multiple access (TDMA) is a channel access method for shared medium (usually radio) networks. It allows several users to share the same frequency channel by dividing the signal into different time slots. The users transmit in rapid succession, one after the other, each using his own time slot. This allows multiple stations toshare the same transmission medium (e.g. radio frequency channel) while using only a part of its channel capacity. TDMA is used in the digital 2G cellular systems such as Global System for Mobile Communications (GSM), IS-136, Personal Digital Cellular (PDC) and iDEN, and in the Digital Enhanced Cordless Telecommunications (DECT)standard for portable phones. It is also used extensively in satellite systems, and combat-net radio systems.

FDMA:Frequency Division Multiple Access or FDMA is a channel access method used in multiple-access protocols as a channelization protocol. FDMA gives users an individual allocation of one or several frequency bands, allowing them to utilize the allocated radio spectrum without interferingwith each other. Multiple Access systems coordinate access between multiple users. The users may also share access via different methods such TDMA, CDMA, or SDMA. These protocolsare utilized differently, at different levels of the theoretical OSI model.

GPRS (General Packet Radio Services) E-Mail

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General Packet Radio Services (GPRS) is a packet-based wireless communication service that promises data rates from 56 up to 114 Kbps and continuous connection to the Internet for mobile phone and computer users. The higher data rates allow users to take part in video conferences and interact with multimedia Web sites and similar applications using mobile handheld devices as well as notebook computers. GPRS is based on Global System for Mobile (GSM) communication and complements existing services such circuit-switched cellular phone connections and the Short Message Service (SMS).In theory, GPRS packet-based services cost users less than circuit-switched services since communication channels are being used on a shared-use, as-packets-are-needed basis rather than dedicated to only one user at a time. It is also easier to make applications available to mobile users because the faster data rate means that middleware currently needed to adapt applications to the slower speed of wireless systems are no longer be needed. As GPRS has become more widely available, along with other 2.5G and 3G services, mobile users of virtual private networks (VPNs) have been able to access the private network continuously over wireless rather than through a rooted dial-up connection.GPRS also complements Bluetooth, a standard for replacing wired connections between devices with wireless radio connections. In addition to the Internet Protocol (IP), GPRS supports X.25, a packet-based protocol that is used mainly in Europe. GPRS is an evolutionary step toward Enhanced Data GSM Environment (EDGE) and Universal Mobile Telephone Service (UMTS).