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


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.

Table of Contents

  • 1. Synopsis
  • 2. IS-95 CDMA
    • 2.1 Spread Spectrum to share radio resources
      • 2.1.1 Code Division
      • 2.1.2 CDMA advantages
    • 2.2 Forward Error Correction
    • 2.3 Compatibility with AMPS
    • 2.4 Simultaneous transmission and reception
    • 2.5 CDMA IS-95A/B Futures
  • 3. GSM
    • 3.1 Frequencies
    • 3.2 GMSK Modulation
    • 3.3 Time and Frequency Division Multiplexing
    • 3.4 Hearing aid compatibility
      • 3.4.1 Pulsed transmission
      • 3.4.2 Standards and regulation
    • 3.5 Timing and power control
    • 3.6 Distance limits
    • 3.7 Voice compression
    • 3.8 Modulation and interleaving
    • 3.9 Frequency Hopping
  • 4. Related reports
  • Table seq Table \* Arabic 1 – GSM Radio Frequencies

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Licence Information

Focus Report Profile


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

Number of pages 11

Status Archived

Last updated 19 Mar 2007
Update History

Analyst: Robin Whittle

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