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Topic: Time division multiple access


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GSM

In the News (Tue 25 Jun 19)

  
  Time division multiple access - Wikipedia, the free encyclopedia
TDMA is also used extensively in satellite systems, local area networks, physical security systems, and combat-net radio systems.
TDMA (the technique) is used in the GSM standard.
In radio systems, TDMA is almost always used alongside FDMA (Frequency division multiple access) and FDD (Frequency division duplex); the combination is referred to as FDMA/TDMA/FDD.
en.wikipedia.org /wiki/Time_division_multiple_access   (936 words)

  
 TDMA - Time Division Multiple Access
TDMA (Time Division Multiple Access) is a digital mobile phone network that operates in the US, Latin America, New Zealand, parts of Russia and Asia Pacific.
TDMA is also used sometimes to refer specifically to the standard covered by IS-136, which is a source of confusion because GSM also uses a TDMA air interface, as does IDEN, and neither of those systems are compatible with IS-136.
Time division multiple access A digital radiocommunications access multiplexing technique that interleaves multiple signals on a single radiofrequency channel in a rotated sequence of time slots, with each user exclusively accessing the channel at any one time.
www.auditmypc.com /acronym/TDMA.asp   (1138 words)

  
 Time division multiple access
Time Division Multiple Access (TDMA), one standard for shared medium (usually radio) networks.
The name "TDMA" is also used for one of the second generation mobile phone technologies, which uses the TDMA technique to timeshare the bandwidth of the carrier wave.
It provides between 3 to 6 times the capacity of its predecessor AMPS, and also improved security and privacy.
www.ebroadcast.com.au /lookup/encyclopedia/td/TDMA.html   (84 words)

  
 Time division multiple access   (Site not responding. Last check: 2007-11-05)
The name "TDMA" is also used to refer to a specific second generation mobile phone standard - more properly referred to as IS-136, which uses the TDMA technique to timeshare the bandwidth of the carrier wave.
Prior to the introduction of IS-136, there was another TDMA North American digital cellular standard called IS-54(which was also referred to just as "TDMA").
However, TDMA (the standard) has been competing against GSM and systems based on CDMA modulation for adoption by the carriers.
www.bopedia.com /en/wikipedia/t/ti/time_division_multiple_access.html   (182 words)

  
 Time Division Multiple Access Without a Bus Master
After the message and gap, a guard time is allocated to accommodate timing skew among the oscillators of the nodes.
This frame sync serves as a central time reference point and is used to resynchronize the time bases of each slave node, eliminating cumulative time skew caused by oscillator speed inaccuracies over the duration of a frame.
The disadvantages of initial allocation of mastership with stable time bases are that logic for an initial arbitration scheme must be included, and very stable time bases must be used to minimize oscillator skew over the longest possible time between messages on the network.
www.ece.cmu.edu /~koopman/jtdma/jtdma.html   (4577 words)

  
 [No title]   (Site not responding. Last check: 2007-11-05)
The base station Z in Figure 1, transmits the fourth outgoing wireless signal 24 comprising the plurality of the fourth discrete frequency tones F3 that are orthogonal frequency division multiplexed (OFDM) in the second frequency band to the fourth remote station X during the fourth time division multiple access (TDMA) interval.
The time requirements for achieving initial synchronization are not as critical as for the case when the RU has to reestablish frequency lock after sleep mode.
Time diversity repeatedly transmits information at time spacings that exceed the coherence time of the channel, so that multiple repetitions of the signal will be received with independent fading conditions.
www.wipo.int /cgi-pct/guest/getbykey5?KEY=98/35463.980813&ELEMENT_SET=DECL   (13342 words)

  
 Time Division Multiple Access Solution TDMA VSAT Data Connectivity
Time division multiple access (TDMA) is digital transmission technology that allows a number of users to access a single radio-frequency (RF) channel without interference by allocating unique time slots to each user within each channel.
The TDMA system is designed for use in a range of environments and situations, from hand portable use in a downtown office to a mobile user traveling at high speed on the freeway.
TDMA offers a flexible air interface, providing high performance with respect to capacity, coverage, and unlimited support of mobility and capability to handle different types of user needs.
www.icces.com /tdma.htm   (233 words)

  
 Frequency-division multiple access - Wikipedia, the free encyclopedia
FDMA is an access technology and stands for Frequency Division Multiple Access.
The terminology “multiple access” implies the sharing of the resource amongst users and the “frequency division” describes how the sharing is done – by allocating users with different carrier frequencies of the radio spectrum.
In contrast to this methodology with Time Division Multiple Access TDMA, where users are separated in time, Code Division Multiple Access CDMA where users are separated by codes and other multiple access schemes: SDMA – Space division multiple access, CSMA – Carrier sense multiple access, and MF-TDMA - Multi-Frequency TDMA
en.wikipedia.org /wiki/FDMA   (387 words)

  
 Time division multiple access   (Site not responding. Last check: 2007-11-05)
The name " TDMA " is also commonly used in America to refer to specific second generation (2G) mobile phone standard more properly referred to as IS-136 or D-AMPS which uses the TDMA technique to the bandwidth of the carrier wave.
TDMA is a type of Time-division multiplexing with the special point that instead having one transmitter connected to one receiver are multiple transmitters.
In the GSM system the synchronisation of the mobile is achieved by sending timing offset commands the base station which instructs the mobile to transmit earlier or later.
www.freeglossary.com /TDMA   (772 words)

  
 TDMA - Time Division Multiple Access
TDMA (also known as D-AMPS) is a technology for digital transmission of radio signals between a mobile telephone and a radio base station.
In TDMA, the frequency band is split into a number of channels.
Each channel is split into three time units, so that three calls can share a single frequency channel without interfering with one another.
www.ericsson.com /technology/tech_articles/TDMA.shtml   (107 words)

  
 code division multiple access Search-e.com | codedivisionmultipleaccess
Wideband code division multiple access (W–CDMA) is a CDMA channel that is four times wider than the current channels that are typically used in 2G networks in North America.
CDMA (Code-Division Multiple Access) is a form of multiplexing, which allows numerous signals to occupy a single transmission channel, optimizing the use of available bandwidth.
Stands for "Code Division Multiple Access." CDMA is a wireless transmission technology that was developed during World War II by the English allies to avoid having their transmissions jammed.
www.search-e.com /find/code+division+multiple+access.shtml   (1498 words)

  
 Definition: time-division multiple access   (Site not responding. Last check: 2007-11-05)
A communications technique that uses a common channel (multipoint or broadcast) for communications among multiple users by allocating unique time slots to different users.
Note: TDMA is used extensively in satellite systems, local area networks, physical security systems, and combat-net radio systems.
A multiple access technique whereby users share a transmission medium by being assigned and using (one at a time) for a limited number of time division multiplexed channels; implies that several transmitters use one channel for sending several bit streams.
www.atis.org /tg2k/_time-division_multiple_access.html   (99 words)

  
 Mobile/Cellular Technology - CDMA IS-95 (Code Division Multiple Access) Digital Mobile Telephone Standard
CDMA (code division multiple access) is a second-generation digital mobile telephone standard which takes a different approach to the other, competing standards: GSM (Global System for Mobile Communications) and TDMA (Time Division Multiple Access).
No other conversations can access this channel until the subscriber's call is finished, or until that original call is handed off to a different channel by the system.
TDMA (time division multiple access) and GSM systems have to add an extra stage of encryption to the signal to ensure privacy, whereas encryption is inherent to the CDMA system.
www.mobilecomms-technology.com /projects/cdma_is95   (889 words)

  
 [No title]   (Site not responding. Last check: 2007-11-05)
In May 1987, the narrowband time division multiple access (TDMA) solution was chosen.
In satellite communications, the capability of a communications satellite to function as a portion of a communications link between more than one pair of satellite terminals concurrently.
The three types of multiple access presently used with communications satellites are code-division, frequency-division, and time-division...
www.worldhistory.com /wiki/T/Time-division-multiple-access.htm   (234 words)

  
 Define TDMA - a definition from Whatis.com - see also: time division multiple access   (Site not responding. Last check: 2007-11-05)
TDMA (time division multiple access) is a technology used in digital cellular telephone communication that divides each cellular channel into three time slots in order to increase the amount of data that can be carried.
An alternative multiplexing scheme to FDMA with TDMA is CDMA (code division multiple access), which takes the entire allocated frequency range for a given service and multiplexes information for all users across the spectrum range at the same time.
IS-136, an evolved version of IS-54, is the United States standard for TDMA for both the cellular (850 MHz) and personal communications services (1.9 GHz) spectrums.
searchnetworking.techtarget.com /sDefinition/0,,sid7_gci214175,00.html   (266 words)

  
 Code division multiple access - LearnThis.Info Enclyclopedia   (Site not responding. Last check: 2007-11-05)
Generically (as a multiplexing scheme), code division multiple access (CDMA) is any use of any form of spread spectrum by multiple transmitters to send to the same receiver on the same frequency channel at the same time without harmful interference.
Other widely used multiple access techniques are Time Division Multiple Access (TDMA) and Frequency Division Multiple Access (FDMA).
Signals with the desired spreading code and timing are received, while signals with different spreading codes (or the same spreading code but a different timing offset) appear as wideband noise reduced by the process gain.
encyclopedia.learnthis.info /c/co/code_division_multiple_access.html   (757 words)

  
 [No title]   (Site not responding. Last check: 2007-11-05)
Code division multiple access (CDMA) is a form of multiplexing (not a modulation scheme) and a method of multiple access that does not divide up the channel by time (as in TDMA), or frequency (as in FDMA), but instead encodes data with a certain code associated with a channel and uses the constructive interference properties...
This is an application of Code Division Multiple Access, or CDMA.
The specialists of the National Agency for Telecommunications and Information Regulation mentioned that dynamic of investments done in 2003-2004 years in the development of telecommunication and information of the Republic of Moldova shows that in 2005 their volume would exceed the level of the last year.
www.worldhistory.com /wiki/C/Code-division-multiple-access.htm   (401 words)

  
 ELEC301: Code Division Multiple Access (CDMA)
TDMA enhances FDMA by further dividing the spectrum into channels by the time domain as well.
A channel in the frequency domain is divided among multiple users.
Within that is the vertical division in the time domain.
www.owlnet.rice.edu /~elec301/Projects01/cdma/compare.html   (235 words)

  
 SurfWax: News, Reviews and Articles On Time Division Multiple Access
TDMA (Time Division Multiple Access) works by dividing a radio frequency into time slots and then allocating slots to multiple calls.
At the same time, industry newcomer Qualcomm of San Diego was promoting a separate standard, CDMA (code division multiple access), which would prove superior at handling data.
Time Division Multiple Access divides a radio frequency available to a network into time slots and then allocates slots to multiple calls.
news.surfwax.com /telecom/files/Time-Division_Multiple_Access.html   (2599 words)

  
 IEC: Time Division Multiple Access (TDMA)
With the growing technology competition applied by Qualcomm in favor of code division multiple access (CDMA) and the realities of the European global system for mobile communications (GSM) standard, the CTIA decided to let carriers make their own technology selection.
CDMA is a spread-spectrum technology that allows multiple frequencies to be used simultaneously.
Because of its adoption by the European standard GSM, the Japanese Digital Cellular (JDC), and North American Digital Cellular (NADC), TDMA and its variants are currently the technology of choice throughout the world.
www.iec.org /online/tutorials/tdma   (434 words)

  
 Code Division Multiple Access
This, in large part, is a result of the January 1998 European Telecommunications Standards Institute’s decision to deploy two flavors of CDMA (Wideband CDMA and Time Division CDMA) as it’s third generation standards.
Also realized was the fact that "...optimal multiple access communications requires that all user stations (mobiles) regulate their transmitter powers to the lowest levels that will achieve adequate signal quality." (
When compared to time division multiple access and frequency division multiple access, the reuse factor of CDMA is far superior, partially because it is applied in a different manner than TDMA or FDMA.
oak.cats.ohiou.edu /~mh865/rdraft.htm   (778 words)

  
 TDM: Time Division Multiplex and Multiplexer
Time Division Multiplex (TDM) is a technique of transmitting multiple digitized data, voice, and video signals simultaneously over one communication media by interleaving pulses representing bits from different channels or time slots.
TDMA is also used in the cellular network for mobile wireless communications.
Time Division Multiplexer is a device using the TDM techniques to combine several slower speed data streams into a single high speed data stream.
www.networkdictionary.com /telecom/tdm.php   (447 words)

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