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.

Table of Contents

  • 1. Synopsis
  • 2. 3G background
    • 2.1 No single global 3G standard
  • 3. 3G Technologies
    • 3.1 DoCoMo FOMA WCDMA
      • 3.1.1 DoCoMo’s 4G plans
    • 3.2 TD-CDMA and TD-SCDMA
      • 3.2.1 Timing disadvantages of Time Division Duplexing (TDD)
      • 3.2.2 Inter-cell interference
      • 3.2.3 TD-SCDMA in China
      • 3.2.4 TD-CDMA for broadcasting
    • 3.3 3GPP2 CDMA2000
    • 3.4 IMT-SC - GSM EDGE
    • 3.5 IMT-FT - DECT
    • 3.6 UWC-136
    • 3.7 3G Spectrum
  • 4. Spreading and Scrambling
    • 4.1 The spreading code
      • 4.1.1 Rejecting narrowband interference
      • 4.1.2 Multipath reception
      • 4.1.3 Rejecting other data channels
      • 4.1.4 Orthogonal spreading patterns
    • 4.2 Pseudo-noise and non-orthoganality
      • 4.2.1 Separating signals to and from handsets
      • 4.2.2 Variable length spreading codes
    • 4.3 The scrambling code
      • 4.3.1 UMTS WCDMA base-station ID
  • 5. Related reports

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Focus Report Profile


Mobile & Wireless Broadband and Media
Mobile Communications (voice and infrastructure)

Number of pages 13

Status Archived

Last updated 19 Mar 2007
Update History

Analyst: Robin Whittle

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