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| | TechOnLine - Wireless and DSP Backgrounder |
 | | They perform a function known as "speech coding" in which the analog output from the microphone is digitized and then compressed or "coded" according to one of several available algorithms. | | | Many wireless network operators are planning to move from analog technology to digital. | | | The wireless industry is the focus of numerous vendors of systems, semiconductors, and software designers who are driving improvements in cost, power consumption, and spectrum efficiency. |
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http://www.techonline.com/community/tech_group/comm/feature_article/20117
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| | All about the Technology |
| | The first analog cellular systems were based on IMTS and developed in the late 1960s and early 1970s. | | | (2G) digital cellular systems were first developed at the end of the 1980s. | | | It is to be noted that analog and digital systems, 1G and 2G, still co-exist in many areas. |
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http://www.itu.int/osg/spu/ni/3G/technology
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| | [No title] |
| | The phones that will be available—called either "tri-mode" or "dual-mode dual-frequency"—will operate on 800-MHz analog, 800-MHz digital and 1900-MHz digital. | | | So in 1982, Europe started to look for digital solutions not because growth was causing capacity problems, but because incompatible national cellular systems were stifling growth. | | | Later on, in the early '90s, cellular telephony had its own revolution with the introduction of digital technology. |
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http://www.sunybroome.edu/~dixon_a/info/cellular1.txt
(1441 words)
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| | An Overview Of Cellular As A Wireless Communication Method |
| | GSM, which is the most popular digital cellular communication paradigm, is the short for "Global System for Mobile Communication". | | | In Japan, there are two different types of analog cellular systems: NTT and JTACS, which were developed from different backgrounds. | | | Thus the capacity of a cellular communication system would be enhanced theoretically infinitely. |
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http://www.cs.sfu.ca/~yzchen/personal/htmls/prj_cellular/prj_cellular.htm
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| | New Digital Cellular Phone Security Cracked |
| | And it's still true that digital cellular systems are much harder to casually eavesdrop on than analog phones. | | | The attack can be carried out in a few minutes on a conventional personal computer. | | | NSA has released the following statement with regards to the news today about the cryptographers who found the flaw in the digital cellular code. |
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http://www.snapshield.com/www_problems/United_States/New_Digital.htm
(787 words)
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| | CIG Facts '96 |
| | Supporting all major cellular system formats, CIG's expertise spans six analog and four digital cellular technologies with system integration and intelligent network offerings. | | | The EMX 2500-S is a smaller, fully-compatible mobile switch and is upgradable in modular steps to the EMX 2500-E. All members of the EMX family have advanced functions, such as Intelligent Network (IN) services and support for digital technology and features. | | | CIG offers the comprehensive SC family of base station systems based on an open architecture that supports multiple (analog and digital) air interfaces. |
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http://www.businesswire.com/emk/1492-1.htm
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| | Mobile/Cellular Technology - PDC (Personal Digital Cellular) Telephone Technology - Mobile Cellular Voice |
| | PDC is the most spectrally efficient of TDMA technologies, with six half-rate (or three full-rate) channels possible in a 25kHz frequency space, compared to three channels in 30kHz in IS-136 and eight channels in 200kHz for GSM. | | | PDC is currently only used in Japan, with the first systems introduced by NTT DoCoMo in 1991 as a replacement for the earlier analog networks. | | | This utilizes a packet-based system, letting users use a single channel simultaneously. |
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http://www.mobilecomms-technology.com/projects/pdc
(677 words)
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| | Understanding networks - Sony Ericsson |
| | It is considered the least advanced digital technology, partly because of its lack of flexibility compared with other digital cellular technologies. | | | Although all users are currently in Japan, operators in other regions of the world are actively considering PDC. | | | In this way, a single frequency can support multiple, simultaneous data channels. |
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http://www.sonyericsson.com/spg.jsp?cc=ae&lc=en&ver=4000&template=pc4_1&zone=pc&lm=pc4
(1036 words)
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| | Sep05_article04 |
| | All the second-generation digital cellular system designs were optimized for telephone traffic. | | | The user data rates for these services were further constrained by the interference-prone nature of the radio environment. | | | A mobile computing infrastructure should support different wireless and wireline communications devices optimized for their specific environment. |
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http://www.itdl.org/Journal/Sep_05/article04.htm
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| | The Dynamics of Standards Creation in the Global Wireless Telecommunications Markets |
| | GSM is considered to be the digital equivalent to TACS. | | | In addition, the voice quality of analog was perceived as better because digital subscribers would often be cutoff if their signal weakened, while analog subscribers could carry on their conversations over a little static. | | | The cellular era took root with the fertilization of concepts that appeared in system proposals from Bell Labs. |
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http://www.sims.berkeley.edu/courses/is224/s99/GroupD/project1/paper1.html
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| | Privateline.com Mobile Telephone History: Page 11 |
| | Built on an earlier proposal, this code-division multiple access or CDMA based system would be all digital and promised 10 to 20 times the capacity of existing analog cellular systems. | | | Based on TDMA, carriers hoped to eventually replace their three analog cellular systems with digital working and thereby increase capacity. | | | These early digital schemes all use time division multiple access or TDMA. |
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http://www.privateline.com/PCS/history11.htm
(1048 words)
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| | PhotoRescue.com - Digital Photo Flash Card Media Data Recovery |
| | FlashBack™ recovers files from digital devices that have been lost due to system or battery failure, accidental format or deletion, and corruption caused by hardware or software malfunction. | | | We offer data recovery for digital film, including SmartMedia, CompactFlash, SanDisk, and Sony MemoryStick, as well as the floppies, CD's and hard drives that some cameras use for data storage. | | | Big Blue's latest 1-GB Microdrive brings high-capacity, high performance data storage to a variety of handheld electronic products, including digital cameras, handheld personal computers, personal digital assistants, portable Internet music players and video cameras. |
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http://www.photorescue.com
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| | CSD April 2000 Feature: Data Over Cellular: A Look at GPRS |
| | An early example of this technology on a cellular network is the cellular digital packet data (CDPD) protocol. | | | The first step, known as "1xRTT," is a straightforward upgrade to cdmaOne using the same channels and modulation system, but using modified digital processing. | | | Billing is done on a cents-per-packet basis, independent of the time spent online. |
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http://www.commsdesign.com/main/2000/04/0004feat2.htm
(3291 words)
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| | Digital Cellular Tutorial |
| | By using TDMA instead of FDMA, IS-54 increases the number of users from 1 to 3 per channel (up to 10 with enhanced TDMA). | | | Designed to address the problem of using existing channels more efficiently, IS-54 employs the same 30 kHz channel spacing and frequency bands (824-849 and 869-894 MHz) as the current North American analog cellular standard: AMPS. | | | More information on our PDC-speci fic products will be covered in future editions of this briefing. |
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http://home.comcast.net/~conscriptt/tech/digital.html
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| | HITACHI TO LAUNCH "PERSONA" COLOR HANDHELD PC WITH JAPANESE-LANGUAGE VERSION OF MICROSOFT |
| | The rapid proliferation of personal computers and advances in the communications infrastructure are making ever more sophisticated information access and processing capabilities available over a broad range of venues, centered mainly on the office. | | | (R) Pocket Outlook?, a lineup that provides easy linkage with personal computers and access to data from the Internet, as well as a multitude of ways to put it to use. | | | (R) Excel and other data with personal computers. |
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http://www.hitachi.com/New/cnews/E/1998/980311B.html
(1093 words)
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| | Heterogeneous Personal Communications Services |
| | His current research interests include design and analysis of personal communications services network, mobile computing, distributed simulation, and performance modeling. | | | This "first-generation" analog cellular system has been available since 1983. | | | EIA/TIA IS-95 [11] is a digital cellular system operating in the United States since 1989. |
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http://www.comsoc.org/ci/private/1996/sept/lin.html
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| | Mobile Phone News: Belgium and France telecom-telinfo consortium complete negotiations |
| | Gerald Levin, chairman and CEO of Time Warner Inc. [TWX], said the changes are part of an ongoing process to simplify and consolidate the company's structure, operations and management. | | | Southwestern Bell Mobile Systems [SBC] is conducting the trial of the software with AT&T Network Systems in its Dallas market, and it should be available for purchase by carriers by 1996. | | | Ericsson's PDC system, known as CMS 30, is expected to be operational in 1997. |
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http://www.findarticles.com/p/articles/mi_m3457/is_n49_v13/ai_17843449
(1141 words)
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| | [No title] |
| | A rate that shows how fast binary digits can be sent through a channel. | | | A stand that your PDA sits in while information is exchanged with your PC. | | | A method by which a mobile device is connected by cradle/bay or cable to a desktop/notebook computer in order to perform synchronizations. |
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http://www.covers.com/covers/mobile/glossary.asp
(506 words)
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| | Cellular Technologies Of The World |
| | By using TDMA instead of FDMA, IS-54 increases the number of users from 1 to 3 per channel (up to 10 with enhanced TDMA). | | | Space Division Multiple Access, thought of as a component of Third Generation Digital Cellular/UMTS | | | The first U.S. digital standard to be developed. |
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http://www.cellular.co.za/celltech.htm
(1739 words)
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| | Radio-Electronics.Com :: Personal Digital Cellular (PDC) |
| | PDC was introduced in Japan in 1991 with the move from analogue to digital technology. | | | The normal system uses a circuit switched approach where a complete circuit is switched for a given user. | | | The Personal Digital Cellular or Pacific Digital Cellular (PDC) system is a second-generation mobile phone technology introduced in 1991. |
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http://www.radio-electronics.com/info/cellulartelecomms/pdc/pdcsummary.php
(692 words)
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| | Definitions: CDMA, TDMA and GSM |
| | Audio input is first digitized into binary elements. | | | CDMA2000 and wideband CDMA deliver data many times faster. | | | GSM (Global System for Mobile communication) is a digital mobile telephone system that is widely used in Europe and other parts of the world. |
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http://whatis.techtarget.com/originalContent/0,289142,sid40_gci919011,00.html
(678 words)
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| | The Auto Channel - Search Results |
| | New Intel XScale Telematics Products at Digital Car Conference DETROIT--March 4, 2002-- Intel Corporation displayed its new Intel(R) XScale(TM) technology based processors today for the telematics market segment. | | | New Intel XScale Telematics Products at Digital Car Conference | | | products, today announced that its DiskOnChip(TM) flash disk product has been selected as the local data storage device in a new line of in-car personal computers (PCs) being developed jointly by Bcom Electronics, STMicroelectronics and Ford Lio Ho of Taiwan, a joint venture between Taiwan's Lio Ho |
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http://theautochannel.com/search/search.html?words=Personal+Digital+Cellular
(648 words)
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| | Personal Digital Cellular - Wikipedia, the free encyclopedia |
| | PDC has 61.817 million subscribers as of end December 2003 but is slowly being phased out in favor of 3G technologies like W-CDMA and CDMA2000. | | | PDC is implemented in the 800 MHz (downlink 810-888 MHz, uplink 893-958 MHz), and 1.5 GHz (downlink 1477-1501 MHz, uplink 1429-1453 MHz) bands. | | | The air interface is defined in RCR STD-27 and the core network MAP by JJ-70.10. |
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http://en.wikipedia.org/wiki/Personal_Digital_Cellular
(269 words)
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| | Mobile Pipeline Review: Japanese Handset Tunes In Analog TV |
| | It's possible that analog TV will be a short-lived technology in mobile handsets, however, given the rise of several digitally broadcast alternatives. | | | More goodies live in the tightly packed embedded Sharp camera module, which houses both a charge-coupled-device timing generator and image processor along with the 1.3-megapixel CCD image sensor and lens. | | | Back in 1999, Samsung introduced the SCH-M220, featuring the first analog TV tuner to be combined into a cellular handset. |
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http://www.mobilepipeline.com/showArticle.jhtml?articleId=168601506
(887 words)
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| | Digital ChoreoGraphics' NASA Software Development |
| | Digital ChoreoGraphics designed and developed a 3 Dimensional Visualization and Animation software package used to present data captured from the Goldstone Radar facility. | | | Digital ChoreoGraphics designed and wrote the operating systems, data acquisition sub-systems, digital filters, data encoding and decoding firmware, interprocessor communication code, self-test diagnostic firmware, and designed and built the 8086 based hardware, software, and diagnostic tools for the test fixture. | | | Digital ChoreoGraphics responded to a requirement from JPL's Deep Space Network to quickly provide an inexpensive 3D Visualization tool to be used in preliminary research for the Martian Rover Project. |
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http://www.dcgfx.com/3dvis.htm
(353 words)
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| | Mobile Telephony: What Makes it Mobile? |
| | The first thing to notice is that there are a lot of different analog and digital technologies that have evolved over the years and none of them talk to each other. | | | These new digital systems differentiate themselves by the modulation they use to encode the digital information onto the RF carrier. | | | In the case of the first cellular systems, the upgrade to digital technology used much of the existing infrastructure, including the assigned frequency bands. |
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http://www.informit.com/isapi/product_id~{42E4BDC0-3075-4725-921C-3A10552E47B5}/element_id~{090F44F2-40CC-4A79-B09C-3EE90F364F87}/st~CA1FEB69-C272-4194-9449-92E4E051EC35/content/articlex.asp
(1019 words)
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| | fusionOne: Advertising Opportunities |
| | HDML (handheld device markup language): Written to allow Inter net access from wireless devices such as handheld personal computers and smart phones. | | | Digital: The newest form of wireless communications that takes all voice transmissions and converts them to computer language (zeros and ones, or "binary" language) and then reconstructs them into the original voice format at the other end. | | | It is more prone to interference, static, eavesdropping and cloning than digital systems, but is still deployed in many parts of the world where the advanced technology (and higher cost) of digital systems is not deemed necessary. |
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http://www.fusionone.com/partner/advertising/wireless_glossary.html
(648 words)
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| | IEC: Global System for Mobile Communication (GSM) |
| | One challenge facing analog systems was the inability to handle the growing capacity needs in a cost-efficient manner. | | | It is forecasted that cellular systems using a digital technology will become the universal method of telecommunications. | | | The advantages of digital systems over analog systems include ease of signaling, lower levels of interference, integration of transmission and switching, and increased ability to meet capacity demands. |
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http://www.iec.org/online/tutorials/gsm/topic01.html
(326 words)
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| | Business Data Communications, 3rd Edtion |
| | Oldest multiple access technology most commonly used for analog cellular communication systems | | | Type of multiplexing developed for both digital and analog transmission on fiber-optic cables | | | TDMA digital system for cellular radio in use in Japan |
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http://www.scsite.com/bdc3e/key.cfm?chapter=4
(664 words)
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| | Motorola Mediacenter - Press Releases |
| | TU-KA was the first operator to implement Dynamic Equip Sharing (DES) software on its PDC network in 1997. | | | Motorola, Inc. (NYSE:MOT) is a global leader in providing integrated communications solutions and embedded electronic solutions. | | | We are proud to have provided a 28.8Kbps high-speed wireless Internet access for a PDC system in Japan,” said Shinji Ogura, general manager of Motorola’s GTSS operations in Japan. |
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http://www.motorola.com/mediacenter/news/detail/0,1958,615_372_23,00.html
(474 words)
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| | The Wireless World Text Page |
| | These systems are less robust to channel variations and are therefore targeted to pedestrian use. | | | The European system is called DECT (Digital European Cordless Telephony) and the Japanese system is called PHS (Personal Handyphone System). | | | The cellular architecture allowed frequency re-use, dramatically increasing capacity to a maximum of 832 channels per cell. |
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http://jan.ucc.nau.edu/~ee53x-c/samples/mobtelhist.html
(446 words)
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| | Tektronix MBD: Press Release > R3263, R3465 Spectrum Analyzers (North America Only) |
| | These tests include power, frame power, phase error, frequency error, I/Q origin offset, burst amplitude droop, error vector magnitude and magnitude error. | | | In the R3465, one key selects the desired digital mobile standard, -- NADC, PDC, PHS -- automatically setting the standard-specific parameters used in the test and analysis routines. | | | The R3263 and R3465 combine full spectrum analyzer features with easy, multi-standard modulation analysis, a color display, and automated measurements. |
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http://www.tek.com/Measurement/Products/press/R3263.html
(634 words)
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| | SEMISEEK Telecommunications\Telecom |
| | This structure differentiates highly integrated subsystem ICs from fundamental circuit building blocks and discrete transistors. | | | Frequency synthesizer products encompass direct digital synthesizers (DDS), phase-locked loop (PLL) frequency synthesizers and frequency synthesizer evaluation boards implementing DDS, PLL and hybrid systems. | | | American Microsystems, Inc., Best Total ASIC and ASSP Solutions for Foundry, Custom ASICs, Digital, Mixed Signal, Translation ASIC, FPGA Translations, Netrans. |
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http://www.semiseek.com/Electroseek/Pag00844.htm
(534 words)
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| | 3/17/99 - SUN AND NTT DOCOMO JOIN FORCES TO DEVELOP BREAKTHROUGH SERVICES AND SUPPORT FOR THE WORLD'S LARGEST DIGITAL ... |
| | Palo Alto, Calif. and Tokyo, Japan, March 17, 1999 - Sun Microsystems, Inc. and NTT DoCoMo today announced they have signed a Memorandum of Understanding to significantly enhance the features and functionality of one of the world's largest digital cellular network. | | | NTT DoCoMo plans to deploy Sun's Java™ and Jini™ and JavaCard technologies to its i-mode digital cellular phone and wireless services and support, as well as its next generation W-CDMA services. | | | NTT DoCoMo i-mode Cellular Service Subscribers and Suppliers to Benefit from Sun's Jini™ and Java™ and JavaCard Technologies |
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http://www.sun.com/smi/Press/sunflash/1999-03/sunflash.990317.2.html
(676 words)
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| | Definitions |
| | These may serve as a physical or logical, wide-area network environment | | | DCS 1800 is a digital cellular standard based on the Global System for Mobile Communications (GSM) international standard. | | | FCC terminology describing two-way, personal, digital wireless communications systems. |
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http://www.ou.edu/engineering/emc/definitions.html
(574 words)
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| | Integrated mobile telemedical systems: current status and future prospects |
| | However, this popularity and advances in cellular digital mobile systems are not paralleled with similar developments in the wider use and integration of such systems for wireless telemedicine applications. | | | Cellular digital networks, in-building wireless and portable information system appliances are extending the reach, range and manoeuvrability of applications and content [4]. | | | Roponen, E. Illkko, L. Jyrkinen, etal., Digital wireless radiology consultations with a portable computer, J.Telemedicine and Telecare, Vol.4 No.4, pp. |
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http://www.hoise.com/vmw/99/articles/vmw/RI-VM-07-99-1.html
(1000 words)
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| | Wireless Networks Online News for wireless communications professionals |
| | The method as recited in claim 41, wherein said personal communication device is a laptop computer. | | | AMBIT president Robert Crowley said today that the company's invention is important because it allows tracking use and generating revenue: "We began working on this system when it became apparent that there would be a demand for use of email and cell phones by business travelers. | | | The method as recited in claim 41, wherein said RF restricted environment is an airplane. |
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http://www.wirelessnetworksonline.com/content/news/article.asp?docid={075A982E-C747-4BBD-803D-F15486D01D37}&VNETCOOKIE=NO
(194 words)
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| | CDG : News & Events : Japanese Government Panel Urges Adoption of cmda |
| | This would exceed the 4 megahertz frequency band for new digital cellular systems. | | | Ministry of Posts and Telecommunications will start laying the groundwork for introduction of advanced digital communications system | | | The Telecommunications Technology Council advised Posts and Telecommunications Minister Hisao Horinouchi that CDMA would be preferable to the European-based GSM (Global System for Mobile Communications) standard. |
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http://www.cdg.org/news/press/1997/feb26b_97.asp
(539 words)
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| | AT&T News Release, 1993-03-03, AT&T offers wireless digital cellular, personal communications |
| | DSP 1610/1616 high-performance signal coding DSPs for digital cellular base station and mobile terminal applications, respectively. | | | The CSP 1084 IS-54 baseband to radio interface unit and the CSP 1027 IS-54 baseband to audio interface unit. | | | Over the next decade, AT&T Microelectronics will invest $6.4 billion in advanced process technology, packaging, DSP architecture and applications design support aimed at delivering highly integrated, portable, low-power solutions for terminal manufacturers. |
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http://www.att.com/news/0393/930303.mea.html
(633 words)
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| | Contracted Personal Use - Information Technology Services - Marquette University |
| | Digital rates and service can only be provided to customers who have digital phones that are compatible with U.S. Cellular's digital service. | | | Contracted Personal Use - Information Technology Services - Marquette University | | | A credit check is required, and users will be billed directly. |
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http://www.marquette.edu/pages/home/its/help/telecomm/cell/contract
(319 words)
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| | Cellular Encryption Digital Card |
| | If you own a cellular phone Data Capable, than this is what you need - A compact and portable security system that is very easy to operate. | | | When connected to data capable Digital Cellular telephones or Satellite telephones The Cellular Encryption Digital Card provides a high-grade secure voice and data encryption. | | | Very flexible, diverse, portable and easy to use - design for anyone with a need to have their personal and private communications to be sent over cellular or satellite channels in complete privacy. |
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http://www.spylife.com/cellencryption.html
(200 words)
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| | NTT DoCoMo: Subscriber Growth |
| | Privacy Policy regarding Personal Information of our Customers information in full. | | | Please be sure to read all Terms and Conditions and |
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http://www.nttdocomo.com/companyinfo/subscriber.html
(104 words)
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| | Evaluation of the Performance of the Large Scale Network: Performance Evaluation of the PDC-P Network Providing the ... |
| | To meet this growing demand, the switching systems currently in place are being either increased in capacity or replaced by more powerful ones. | | | As the i-mode service grows in popularity, the i-mode traffic carried by the Personal Digital Cellular - Packet (PDC-P) mobile communication network is increasing rapidly. | | | Home Digital Library Site Map Store Help Contact Us Press Room Shopping Cart |
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http://csdl2.computer.org/persagen/DLAbsToc.jsp?resourcePath=/dl/proceedings/&toc=comp/proceedings/hase/2002/1769/00/1769toc.xml&DOI=10.1109/HASE.2002.1173113
(276 words)
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| | GeoPhones World Cellular Service Plans |
| | African Cellular - Latest news in global mobile communications technology. | | | NTT DoCoMo - Provides coverage of almost all regions of Japan(Personal Digital Cellular system) | | | US Cellular - Covering many states and cities |
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http://phones.geoportals.com/category.asp?c=1809
(195 words)
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| | NodeWorks - Encyclopedia: PD: PDC |
| | PDC may stand for: Political parties:* Parti Démocrate-Chrétien Suisse (Switzerland)* Partido Demócrata Cristiano (Chile) Personal Digital Cellular, a Japanese mobile phone standard Programme Delivery Control... |
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http://pedia.nodeworks.com/P/PD/PDC
(43 words)
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| | Chemistry - PDC |
| | Personal Digital Cellular, a Japanese mobile phone standard |
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http://www.chemistrydaily.com/chemistry/PDC
(45 words)
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