Report Results

Documents matching: Global, Mobile - Data, Technical Reports

1 to 12 of 12

• Technology - Audio-Visual Coding 1 - MPEG 1 and MP3

  We discuss MPEG-1 and MPEG-2 audio compression (coding) and major non-MPEG audio coding systems including Real Audio, Windows Media and Vorbis. A detailed explanation of the internal mechanism of MP3 (MPEG-1 Audio Layer III) compression serves as a basis for understanding MP3pro and all other perceptual audio codecs, including Advanced Audio Coding (AAC).

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  Last Updated: Tuesday, 14 February 2006
  Archived: No
  Number of Pages: 14

• Technology - Audio-Visual Coding 2 - MPEG 2 AAC and Video

  We discuss Advanced Audio Coding and how it improves on MP3. We explain enhancements to both AAC including Spectral Band Replication, Parametric Stereo and Scalable Lossless Coding. We discuss HILN parametric audio coding and voice compression algorithms including CELP. We also explain the process of MPEG-2 video compression, which is the basis of almost all digital television systems.

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  Last Updated: Tuesday, 14 February 2006
  Archived: No
  Number of Pages: 14

• Technology - Audio-Visual Coding 3 - MPEG 4 Video and VRML

  We explain how Advanced Video Coding (AVC/H.264) improves on MPEG-2 video compression. The MPEG-4 standards are of unprecedented scope, including animation, synthetic sound and video, VRML interactivity and Java. We introduce these technologies and discuss how they can be used together to provide services and communication systems far beyond the modes we are familiar with today. We also discuss the MPEG-7 metadata and MPEG-21 digital rights management standards.

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  Last Updated: Tuesday, 14 February 2006
  Archived: No
  Number of Pages: 12

• Technology - Digital Broadcasting 5 - Mobile TV

  Broadcasting real-time and stored for replay sound, video and multimedia material to small handheld devices such as cell phones is the ‘Holy Grail’ of both the telecommunications and broadcasting industries. We discuss the needs of such systems and the major approaches to achieving it: Eureka 147 T-DMB, DVB-H, ISDB-Tsb, Qualcomm’s promising MediaFLO and the broadcasting function of Mobile WiMAX. We also discuss the Japanese and South Korean MBSAT T-DMB broadcast system.

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  Last Updated: Wednesday, 26 April 2006
  Archived: No
  Number of Pages: 17

• Technology - Mobile 1 - 2G - Introduction & IS-136 TDMA

  Analogue mobile telephony began with many incompatible systems in the 1980s. By the mid 1990s, the 1G AMPS analogue system and its 2G digital descendant IS-136 TDMA were widely used in North America, with AMPS and 2G GSM the most prominent systems in other areas. We discuss these developments and look in detail at IS-136 TDMA.

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  Last Updated: Monday, 19 March 2007
  Archived: No
  Number of Pages: 9

• Technology - Mobile 2 - 2G - IS-95 CDMA & GSM

  Synopsis

  By the late 1990s, two 2G mobile cellular systems were dominant in areas outside North America: IS-95 and GSM. GSM became the dominant technology and is also the basis for one of the two leading 3G technologies: UMTS W-CDMA. We discuss IS-95 CDMA and GSM, which together with IS-136 were the technologies that lead to the explosive worldwide adoption of mobile telephony.

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  Last Updated: Monday, 19 March 2007
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  Number of Pages: 11

• Technology - Mobile 3 - 2G - GSM SIMs, SMS, CAMEL & HSCSD

  GSM’s innovative Subscriber Identity Module (SIM) streamlined the widespread deployment of mobile telephony, and plays a central role in GSM’s security. We discuss SIMs, encryption, authentication, GSM standards development, GSM network elements, High Speed Circuit Switched Data (HSCSD) and the CAMEL framework for Intelligent Network applications. We also discuss SMS text messaging.

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  Last Updated: Monday, 19 March 2007
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  Number of Pages: 10

• Technology - Mobile 4 - 2-5G - MMS, WAP, GPRS, SAIC & EDGE

  We discuss the two most important 2.5G services - MMS multimedia messaging and the micro-browser based WAP Wireless Application Framework. We discuss GPRS, its Quality of Service characteristics, and problems arising with TCP/IP networking in this or any other mobile data service. We also discuss EDGE - the 2.75G enhancement that forms a bridge to 3G applications and QoS.

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  Last Updated: Monday, 19 March 2007
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  Number of Pages: 15

• Technology - Mobile 5 - 3G Technologies, Spreading & Scrambling

  We discuss 3G’s background and spectrum allocations, DoCoMo’s FOMA WCDMA system, the Time Division Duplex WCDMA technologies TD-CDMA and TD-SCDMA - the latter being developed by China. We also provide a tutorial on frequency spreading and scrambling, which are the two key techniques underlying CDMA, CDMA2000 and the WCDMA 3G technologies.

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  Last Updated: Monday, 19 March 2007
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  Number of Pages: 13

• Technology - Mobile 6 - 3G UMTS, WCDMA, HSPA, LTE

  We discuss in detail the 3GPP’s UMTS WCDMA technology in its current releases and the forthcoming Release 7, including QoS, HSDPA, HSUPA and novel antenna techniques. We also consider the plans for Long Term Evolution (LTE) and discuss the long term prospects for UMTS dominating over its competitors CDMA2000 and both fixed and mobile WiMAX.

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  Last Updated: Monday, 19 March 2007
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  Number of Pages: 15

• Technology - Mobile 7 - 3G CDMA2000, EV-DO, UMB & IMS

  In this report we discuss CDMA2000, 1x EV-DO and Qualcomm’s proposed, but now abandoned, 4G Ultra Mobile Broadband (UMB). We also discuss operating systems and the WAP and Java environments for mobile devices. We discuss the 3GPP’s IP Multimedia Subsystem, an overarching framework for telco-based services including VoIP and Push-to-Talk over Cellular (PoC).

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  Last Updated: Monday, 15 December 2008
  Archived: No
  Number of Pages: 13

• Technology - Mobile 8 - Fixed-Mobile Convergence, UMA, GAN & Femtocells

  We discuss the Unlicensed Wireless Access (UWA) Bluetooth and WiFi approach to Fixed-Mobile Convergence and the new GAN (Generic Access Network) standard for implementing this. We also discuss the various types of base-station, including micro-, pico- and femto-nodes, also known as home base-stations, which extend native cellular access to homes and offices, using DSL etc. for backhaul.

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  Last Updated: Monday, 19 March 2007
  Archived: No
  Number of Pages: 12