Mumbai University > Electronics and telecommunication engineering> Sem 7 > mobile communication

Marks: 5M

Year: May 2016

• IS-95 referred as cdmaone is 2G standard; it is first ever CDMA-based digital cellular technology.

• Features of IS-95 are:

  • Efficient power control scheme.
  • Soft Handoffs.
  • Improved speech quality and reduced interference by having different multiple levels of diversity like: Frequency diversity, Spatial diversity, path diversity and time diversity.
  • Variable rate vocoder.
  • Bandwidth recycling.
  • Uses modulation as Quadrature Phase Shift keying.
  • Channel/Chip rate is 1.2288 Mcps and Data rate of 9.6 kbps.

• Services:

  • Convolution Encoder.
  • Repetition Circuit.
  • Data Scrambling.
  • Quadrature Spreading and Modulation.
  • RF modulation.
  • Burst Randomizing.
  • Direct Sequence Spreading.