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| | Mobile/Cellular Technology - TDMA IA-136 (Time-Division Multiple Access) Mobile Telephone Technology |
 | | Although TDMA could be considered as the least technologically advanced of the second-generation mobile systems, it has proven very popular in the US and developing world as a simple upgrade from analog to digital services. | | | TDMA forms part of the evolution from first-generation analog systems to second- and then third-generation digital systems. | | | However, the implementation that is commonly referred to as TDMA is that defined by IS-136 by the Telecommunication Industries Association (TIA). |
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http://www.mobilecomms-technology.com/projects/tdma_is136
(813 words)
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| | Self-adaptive mobile subscriber access system employing time division multiple accessing - Patent 4215244 |
| | In applying the example code pairs in the time division multiple accessing system of the present invention, it will be helpful to first consider an uncoded system with three users accessing the system with the selected channels occupying the three time slots of one user in the first, second and fourth time slot positions. | | | Use of time division multiple accessing, by itself, has not completely solved the interference problem, as signals from moving transmitters often threaten the channel (or time slot) in which another signal is being received. | | | However, and as will be seen in the description that follows, the apparatus of the present invention provides a self-adaptive feature which operates to move the selected channel period T.sub.2 from its original, to a new vacant channel, so as to avoid the interference otherwise receivable from the moving user R.sub.4,T.sub.4. |
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http://www.freepatentsonline.com/4215244.html
(3183 words)
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| | TDMA - Time Division Multiple Access |
| | TDMA differs from the other popular digital cellular platform, CDMA, in that it uses one channel instead of many. | | | TDMA is the current designation for what was formerly known as D-AMPS. | | | In this way, a single frequency can support multiple, simultaneous data channels. |
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http://www.auditmypc.com/acronym/TDMA.asp
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| | Telephony: The digital dilemma - time division multiple access as a standard for cellular telephones |
| | Narrowband AMPS, an enhancement of the current analog advanced mobile phone system format used in the United States, although not a digital format, uses digital encoding techniques to boost system capacity about 3-to-1. | | | Operators predicted that L.A. Cellular would be the first of many systems to go digital next year. | | | CDMA, developed by Qualcomm, San Diego, uses a different kind of digital encoding format that the company claims can boost capacity 10 to 20 times. |
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http://www.findarticles.com/p/articles/mi_m0TPY/is_n16_v221/ai_11530259
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| | Pukkila: Iterative Receivers and Multichannel Equalisation for Time Division Multiple Access Systems, ISBN 951-22-6717-9 |
| | Particularly, we consider receivers utilising side information, which can be obtained from the error control coding or by having a priori knowledge of interference sources. | | | The thesis introduces receiver algorithms improving the performance of TDMA mobile radio systems. | | | Dissertation for the degree of Doctor of Science in Technology to be presented with due permission of the Department of Electrical and Communications Engineering for public examination and debate in Auditorium S1 at Helsinki University of Technology (Espoo, Finland) on the 10 |
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http://lib.hut.fi/Diss/2003/isbn9512267179
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| | [No title] |
| | In this way, TDMA technology, also referred to as ANSI-136, provides a 3 to 1 gain in capacity over analog technology. | | | It would be interesting if I have a chance to build PN sequence generator by using digital circuits and simulate it using some kinds of software so that I can compare both circuit and simulations. | | | CDMA can handle up to 10~20 times the number of callers as the analog AMPS. |
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http://www.eas.asu.edu/~trace/eee459_sp02/doc/tachibana.doc
(912 words)
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| | time division multiple access from FOLDOC |
| | Nearby terms: time bomb « time complexity « Time Complex Simulator « time division multiple access » time division multiplexing » Time Domain Reflectometer » timeout |
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http://www.bonus.com/contour/compdict/http@@/foldoc.doc.ic.ac.uk/foldoc/foldoc.cgi?TDMA
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| | Effect of scheduling jitter on end-to-end delay in TDMA protocols |
| | The performance of applying our scheduling algorithm to different delivery protocols is compared and evaluated via simulations. | | | Index Terms- scheduling; jitter; delays; time division multiple access; real-time systems; scheduling jitter; end-to-end delay; TDMA protocols; packet delay; distributed system; time division multiple access; destination node; time slot allocation algorithm; transmission rate; ETE delay bound; simulations; real time communication | | | Effect of scheduling jitter on end-to-end delay in TDMA protocols |
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http://csdl2.computer.org/persagen/DLAbsToc.jsp?resourcePath=/dl/proceedings/&toc=comp/proceedings/rtcsa/2000/0930/00/0930toc.xml&DOI=10.1109/RTCSA.2000.896395
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| | Frequency-division multiple access (from telecommunication) -- Encyclopædia Britannica |
| | Overview of this academic division of the Indiana University at Bloomington, U.S. Provides information on the undergraduate and graduate programs, placement and job opportunities, facilities, and the faculty. | | | Overview of research on the influence of genetics and environment on human personality and cognitive abilities. | | | electronic system of links and switches, and the controls that govern their operation, that allows for data transfer and exchange among multiple users. |
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http://www.britannica.com/eb/article-76289?tocId=76289
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| | Code Division Multiple Access |
| | This allows CDMA to operate with 4 to 6 times more capacity than digital TDMA or FDMA. | | | For example, in FDMA, if there are seven users on for a channel, the channel is divided into seven segments, with each user being allocated a channel. | | | Since its official introduction in 1989 as a commercial wireless technology, Code Division Multiple Access has gained international acceptance as a wireless technology that will improve system capacity and service quality. |
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http://oak.cats.ohiou.edu/~mh865/rdraft.htm
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| | Antenna-Sector Time-Division Multiple Access for Broadband Indoor Wireless Systems |
| | The optimum scheduling algorithm, the one that maximizes the number of packets transmitted per frame, may be in the NP-complete class of problems, so it cannot be solved in real time. | | | Therefore, a suboptimum algorithm, called the first fit algorithm (FFA), is proposed for frame scheduling. | | | The simulations have shown that the FFA can provide a large capacity gain when operating with multicarrier trellis-coded modulation and using differential detection. |
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http://www.comsoc.org/sac/private/1998/aug/937_16sac06-macedo.html
(644 words)
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| | Fair Power-Level Division Multiple Access |
| | C. Lee, "Random signal levels for channel access in packet broadcast networks," IEEE J. Select. | | | S. Shimamoto, Y. Onozato, and Y. Teshigawara, "Performance evaluation of power level division multiple access (PDMA) scheme," in Proc. | | | However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. |
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http://www.comsoc.org/comml/private/1997/may/61_01comml03-leung.html
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| | TDM: Time Division Multiplex and Multiplexer |
| | Each of the input data streams then becomes a ¡°time slice¡± in the output stream. | | | The transmission order must be maintained so that the input streams can be reassembled at the destination. | | | The Public-Switched Telephony Network (PSTN) is based on the TDM technologies and often called a TDM access network. |
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http://www.networkdictionary.com/telecom/tdm.php
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| | FDMA - a Whatis.com definition - see also: frequency division multiple access |
| | With FDMA, each channel can be assigned to only one user at a time. | | | The term you selected is being presented by searchMobileComputing.com, a TechTarget site for Mobile Computing professionals. | | | FDMA (frequency division multiple access) is the division of the frequency band allocated for wireless cellular telephone communication into 30 channels, each of which can carry a voice conversation or, with digital service, carry digital data. |
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http://searchmobilecomputing.techtarget.com/sDefinition/0,,sid40_gci213959,00.html
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| | * TDMA - (Computing): Definition |
| | CDMA/TDMA= Code Division Multiple Access and Time Division Multiple Access dual-mode cellular telephones that aid in the receiving of fax and computer network data on computers and PDAs. | | | Ideally, TDMA and CDMA are transparent to each other. | | | A method of digital wireless communications transmission allowing a large number of users to access a single radio-frequency channel without interference... |
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http://en.mimi.hu/computing/tdma.html
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| | Time division multiple access - Wikipedia, the free encyclopedia |
| | This is why early efforts to incorporate timeslots into UMTS failed, leaving UMTS as a purely CDMA technology. | | | TDMA is also used extensively in satellite systems, local area networks, physical security systems, and combat-net radio systems. | | | A disadvantage of TDMA systems is that they create interference at a frequency which is directly connected to the time slot length. |
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http://en.wikipedia.org/wiki/TDMA
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| | multiple_access_techniques |
| | In narrowband FDMA, a user is assigned a particular channel which is not shared by other user in the vicinity, and if FDD is used (that is each channel has a forward and a reverse link), then the system is called FDMAIFDD. | | | Figure 5: Code Division Multiple Access in which each channel is assigned a unique orthogonal to PN codes used by other users. | | | This implies that, unlike FDMA system which accommodate analog FM, digital data and digital modulation must be used with TDMA. |
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http://teletech.freeservers.com/1996/multiple_access_techniques.htm
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| | Carriers continued |
| | A multiple access method is a definition of how the radio spectrum is divided into channels and how channels are allocated to the many users of the system. | | | Other Systems that use the TDMA Air Interface | | | Multiple users share the same frequency band at the same time, yet each user only hears his or her own conversation. |
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http://www.mgmt.utoronto.ca/~fertuck/pbis/ch03b/page5.htm
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| | Time Division Multiple Access |
| | Hence, the receiver ``filters'' are simply windows instead of the bandpass filters required in FDMA. | | | s between time slots are commonly used in TDMA based systems. | | | The former duplexing scheme is used for example in the Digital European Cordless Telephone (DECT) standard and is well suited for systems in which base-to-base and mobile-to-base propagation paths are similar, i.e., systems without extremely high base station antennas. |
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http://thalia.spec.gmu.edu/~pparis/classes/hw_sol_732/hw5/access/node8.html
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| | Time Division Multiple Access Without a Bus Master |
| | However, bus-master based protocols such as TDMA can be undesirable in practice because the bus master node constitutes a single-point failure vulnerability and adds to system expense. | | | We believe that J-TDMA reaps the benefits of TDMA protocols without suffering the reliability and system complexity drawbacks of other TDMA methods. | | | Time Division Multiple Access (TDMA) protocols have the potential to provide simple but effective broadcast bus communications for embedded systems. |
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http://www.ece.cmu.edu/~koopman/jtdma
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| | Time Division Multiple Access |
| | In that regard, time-division multiple access can be considered as a remote multiplexing technology. | | | The difference between time-division multiplexing (TDM) and time-division multiple access is that time-division multiplexing requires users to be collocated to be multiplexed into the channel. | | | Time-division multiple access is a mechanism for sharing a channel, whereby a number of users have access to the whole channel bandwidth for a small period of time (a time slot). |
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http://gsm.argospress.com/abbrevT-tdm.htm
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| | GSM Multiple Access Scheme |
| | TDMA allows many users to share a common channel. | | | As the number of users increases, the required frequency spectrum also increases. | | | Control channels deal with network management messages and channel maintenance tasks. |
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http://www.eecg.toronto.edu/~nazizi/gsm/ma
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| | Definition: multiple access |
| | In computer networking, a scheme that allows temporary access to the network by individual users, on a demand basis, for the purpose of transmitting information. | | | The connection of a user to two or more switching centers by separate access lines using a single message routing indicator or telephone number. | | | Note: Examples of multiple access are carrier sense multiple access with collision avoidance (CSMA/CA) and carrier sense multiple access with collision detection (CSMA/CD). |
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http://www.its.bldrdoc.gov/fs-1037/dir-023/_3427.htm
(134 words)
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| | TD-SCDMA - a Whatis.com definition - see also: time division synchronous code division multiple access |
| | The term you selected is being presented by searchMobileComputing.com, a TechTarget site for Mobile Computing professionals. | | | The standard combines time division multiple access (TDMA) with an adaptive, synchronous-mode code division multiple access (CDMA) component. | | | Supporting data transmission at speeds up to 2 Mbps, TD-SCDMA combines support for both circuit-switched data, such as speech or video, and also packet-switched data from the Internet. |
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http://searchmobilecomputing.techtarget.com/sDefinition/0,,sid40_gci939058,00.html
(164 words)
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| | ELEC301: Code Division Multiple Access (CDMA) |
| | Each user then takes turns occupying the channel. | | | A channel in the frequency domain is divided among multiple users. | | | To better understand CDMA and how it is different, let's compare the three transmission schemes. |
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http://www.owlnet.rice.edu/~elec301/Projects01/cdma/compare.html
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| | Efficient Time-Based Topology-Dependenl Scheduling for (ResearchIndex) |
| | 0.0: Distributed Dynamic Channel Access Scheduling for Ad Hoc.. | | | TDMA transmission allows a number of users to access a single radio channel xvithout interference by allocating unique time slots to each user. | | | Time Division Multiple Access (TDMA) protocol is a common used protocol to schedule collision-free transmission for such networks. |
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http://citeseer.ist.psu.edu/532802.html
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| | A Race-Free Bandwidth Reservation Protocol for QoS Routing in Mobile Ad Hoc Networks |
| | We also provide increased optimizations which signi.cantly enhance the throughput and efficiency of the QoS routing protocol. | | | Previous papers addressed this issue for different communication environments such as TDMA (Time Division Multiple Access) [7] [8] [12] [13] and CDMA (Code Division Multiple Access)-over-TDMA [3] [14] [15]. | | | Existing routing protocols such as DSR, AODV, and TORA are based on a best effort strategy [18][19]. |
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http://csdl2.computer.org/persagen/DLAbsToc.jsp?resourcePath=/dl/proceedings/&toc=comp/proceedings/hicss/2004/2056/09/2056toc.xml&DOI=10.1109/HICSS.2004.1265693
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| | Tech Report: HPL-97-41: An Asynchronous Time Division |
| | The throughput and delay of the proposed scheme obtained from computer simulation shows that good performance can be achieved with modest complexity. | | | Abstract: This paper describes an Asynchronous Time Division Multiplexing-Multiple Access (ATDM-MA) protocol which is designed to support different types of service on future wireless indoor local area networks. | | | The goal of the ATDM-MA protocol is to provide efficient channel utilisation and re-use and operates in conjunction with different Medium Access Control (MAC) protocols for different traffic types (i.e. |
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http://www.hpl.hp.com/techreports/97/HPL-97-41.html
(147 words)
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| | Telephony: The digital dilemma. (time division multiple access as a standard for cellular telephones)@ HighBeam Research |
| | Moreover, delays involving TDMA tend to benefit its rival, code division... | | | It is now realized that mobile and portable telephones that can work with both TDMA and with analog systems are too heavy and expensive. | | | It seemed, only a few months earlier in 1991, that the cellular telephone industry in the US would settle on a transition to digital communications and would use the time division multiple access (TDMA) standard. |
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http://www.highbeam.com/library/doc0.asp?DOCID=1G1:11530259&refid=ip_encyclopedia_hf
(179 words)
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| | Time Division Multiple Access (TDMA) |
| | These time slices are so small that the human ear does not perceive the time slicing. | | | TDMA users share a common frequency channel, but use the channel for only a very short time. | | | When all available time slots in a given frequency are used, the next user must be assigned a time slot on another frequency. |
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http://www.qualcomm.com/ProdTech/cdma/training/cdma25/m4/m4p05.html
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| | Mobile Phone Glossary - TDMA (Time Division Multiple Access) |
| | TDMA is one of the most common digital communication technologies. | | | Ringnow.com is in no way associated with any manufacturer or network mentioned or linked to in this web-site. | | | It divides a sequence of conversations into packets of data according to time. |
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http://www.ringnow.com/tdma.html
(141 words)
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| | High-Tech Dictionary Definition |
| | (TDMA).A multiplexing technology used with satellites and cellular phones, in which multiple channels of data are interleaved (each signal is assigned to a different time interval, and the signals are transmitted by taking turns). |
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http://www.computeruser.com/resources/dictionary/definition.html?lookup=7070
(34 words)
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| | Newsbytes News Network: McCaw speeds delivery of TDMA cellular - Time Division Multiple Access - McCaw Cellular ... |
| | McCaw is linking all its systems nationwide in what it calls the North American Cellular Network, which will allow its customers to roam freely and have their calls transferred through the use of a computer database. | | | Time Division Multiple Access, or TDMA, has been endorsed as a digital standard by the Cellular Telecommunications Industry Association, which has been testing "dual standard" cell sites and phones for over a year. | | | General Motors' Hughes division, a major supplier of cell sites and other cellular gear, also is working on an improved version of TDMA called Extended-TDMA, which it claims offers even more capacity than CDMA. |
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http://www.findarticles.com/p/articles/mi_m0NEW/is_1992_Feb_24/ai_11967119
(381 words)
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| | Definition: time-division multiple access |
| | Note: TDMA is used extensively in satellite systems, local area networks, physical security systems, and combat-net radio systems. | | | A communications technique that uses a common channel (multipoint or broadcast) for communications among multiple users by allocating unique time slots to different users. | | | 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. |
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http://www.its.bldrdoc.gov/projects/devglossary/_time-division_multiple_access.html
(99 words)
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| | Multiple Access Schemes |
| | Three principal types of multiple access schemes are used in modern digital radio systems. | | | The receiver then uses the same spreading code to transform the spread-spectrum signal back into the original user’s data stream. | | | the same spectrum channel frequency is shared by all the active remote stations, but each is only permitted to transmit in short bursts of time (slots), thus sharing the channel between all the remote stations by dividing it over time (hence time division). |
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http://cbdd.wsu.edu/kewlcontent/cdoutput/TR502/page54.htm
(147 words)
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| | CNN.com - Cingular to move to GSM technology by 2004 - November 1, 2001 |
| | The alternative to GSM and EDGE is Code Division Multiple Access, which sits on top of TDMA networks and has Murray Hill, New Jersey-based Lucent Technologies Inc. as one of that technology's main suppliers. | | | The existing Time Division Multiple Access (TDMA) network will gradually be phased out as the GSM network is built and turned on. | | | Customers will be offered special handsets that work on both TDMA and GSM networks, in addition to tri-band or "world" phones that work on GSM networks around the world, Cingular said. |
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http://archives.cnn.com/2001/TECH/ptech/11/01/gsm.technology.idg
(491 words)
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| | Time division multiple access : TDMA |
| | 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. | | | Allows several users to share the same frequency by dividing it into different time slots. | | | Time Division Multiple Access (TDMA), one standard for shared medium (usually radio) networks. |
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http://www.city-search.org/td/tdma.html
(424 words)
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| | TDMA (Time Division Multiple Access) (Linktionary term) |
| | TDMA is a wireless digital communication scheme for cellular phone systems that allocates time slots to multiple users within a single channel. | | | Note: Many topics at this site are reduced versions of the text in "The Encyclopedia of Networking and Telecommunications." Search results will not be as extensive as a search of the book's CD-ROM. | | | It works over existing AMPS (Advanced Mobile Phone Service) frequencies, providing digital service instead of analog service for up to three calls per channel. |
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http://www.linktionary.com/t/tdma.html
(122 words)
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| | CDMA: Code Division Multiple Access |
| | The term Code Division Multiple Access (CDMA) is also widely used to refer to a key technology in the Universal Mobile Telecommunications System (UMTS). | | | The use of an independent code and synchronous reception allows multiple users to access the same frequency band at the same time. | | | Due to increasing market demand for a convered network for both voice and data cpmmunications, CDMA technologies are evolving into CDMA2000 to meet the challenges. |
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http://www.networkdictionary.com/protocols/cdma.php
(273 words)
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| | TDMA – Time Division Multiple Access |
| | In TDMA the time-frequency plane is divided into M discrete timeslots. | | | Each user transmits signal energy during a particular timeslot. |
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http://www2.rad.com/networks/2003/wcdma/tdma.htm
(32 words)
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| | Time-division multiple access (TDMA) |
| | is a mechanism for sharing a channel, whereby a number of users have access to the whole channel bandwidth for a small period of time (a time slot). | | | Communications Systems — Multiple access — Time-division multiple access | | | Our book Communications and Information Systems by Michael J. Ryan and Michael R. Frater provides more information on Communications Systems. |
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http://www.argospress.com/Resources/CommunicationsSystems/timdivisimultipacces.htm
(136 words)
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| | TDMA (Time Division Multiple Access) |
| | Integrate and manage multiple types of information from any source accurately and easily. | | | The Security Solutions You Need When You Need Them. | | | In a TDMA system, three time slots are assigned to a single, 30-kHz carrier frequency, allowing a single channel to support multiple phone calls. |
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http://www.networkworld.com/details/6452.html?def
(874 words)
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| | Space-Time Division Multiple Access (STDMA)* and Coordinated, Power-Aware MACA for Mobile Ad-Hoc Networks ... |
| | Abstract: Space-Time Division Multiple Access (patent pending) is the first position-based TDMA scheduling protocol for mobile ad-hoc networks, and is the generalization of the cellular TDMA with spatial re-use bandwidth allocation paradigm that is encountered in cellular TDMA networks. | | | 4 Collision-Free topology-dependent channel access scheduling - Bao, Garcia-Luna-Aceves - 2000 | | | In STDMA, space is divided into virtual geographic cells (space slots) that are grouped into periodically repeating virtual frames (space frames) in order to facilitate spatial re-use, and time slots are assigned to space... |
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http://citeseer.ist.psu.edu/501485.html
(280 words)
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| | TDMA ( Time Division Multiplexing, Time Division Multiple Access, and TDM) Definition |
| | A 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. | | | Ethernet Access over Any Backbone: LAN-to-LAN, Internet and Multiservice Access—Brochure | | | gateway that provides a high capacity central office solution for transporting multiple E1/T1 links over IP, Ethernet and MPLS-based networks. |
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http://americanbanker.bitpipe.com/tlist/TDMA.html
(407 words)
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| | time division multiple access from FOLDOC |
| | Previous: TILE Forth, Tim Berners-Lee, time bomb, time complexity, Time Complex Simulator | | | Next: time division multiplexing, Time Domain Reflectometer, timeout |
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http://www.instantweb.com/foldoc/foldoc.cgi?TDMA
(28 words)
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