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CDMA Spectral Efficiency. Enhancing the most secured system. CDMA Technology. CDMA – “Most secured” Fast growing rate of CDMA subscribers Evolution of Ev-DO technology in year 2000 Need of spectral efficiency using 1X advance features. Handset. Spectral Efficiency techniques. Network.

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cdma spectral efficiency

CDMA Spectral Efficiency

Enhancing the most secured system

cdma technology
CDMA Technology
  • CDMA – “Most secured”
  • Fast growing rate of CDMA subscribers
  • Evolution of Ev-DO technology in year 2000
  • Need of spectral efficiency using 1X advance features.
spectral efficiency techniques
HandsetSpectral Efficiency techniques


4GV Vocoders

Transmit diversity in Base Station

New Radio Configuration

4-way receive diversity in Base Station

Quasi orthogonal functions

1/8th rate gating on R-FCH

RL interference cancellation

4GV Vocoders

Receive diversity in mobile terminals

Quasi orthogonal functions

New Radio Configuration

Quasi-linear interference cancellation in mobiles

Enhanced FL interference cancellation

1/8th rate gating on R-FCH

quasi linear interference cancellation qlic
Quasi-Linear interference cancellation (QLIC)
  • Pilot consumes sizable amount of power .
  • Interference is common.
  • Important to initialize Pilot Interference Cancelation (PIC) and forward link interference cancelation (FLIC).
reverse link interference cancellation rlic
Reverse Link Interference cancellation (RLIC)
  • Reverse link interference cancellation equally important.
  • Mobile transmits less power .
  • Increase the battery life.
1 8 rate gating on r fch
1/8 rate Gating on R-FCH
  • It is put “ON” at MSC level
  • MS will gate the R-FCH/R-Pilot Channel when transmitting at 1/8th rate.
  • Power control factor is achieved
  • Dynamically prioritize voice quality to increase network capacity
  • EVRC-B is an enhancement to EVRC
  • Used both at the network as well as in the handset.
radio configuration
Radio Configuration
  • Set of forward traffic channel and reverse traffic channel
  • Physical layer parameters such as data rates, modulation characteristics, and spreading rates.
quasi orthogonal functions qof
Quasi-Orthogonal functions (QOF)
  • Increasing of the number of users.
  • Walsh code is limited for much possible users.
  • QOF process optimal cross-correlation with Walsh code
6 sectorization
6 Sectorization
  • Some places with high utilization and excess softer handoff.
  • 6 sector s one of the solution.
  • Instead of using 1 BTS, 2 BTS are used
  • Antenna can be separated from each other at 60 degrees instead of 120 degrees.
network optimization
Network Optimization
  • Ec/Io optimization
  • Forward and reverse link imbalance
  • Excessive soft handoff areas
  • Improper RF parameters settings
  • Use repeaters for low utilized sectors
antenna diversity
Antenna Diversity
  • Improve the quality of a wireless link
  • Mitigate these multipath situations
  • Using multiple antennas decreases the number of drop-outs and lost connections
  • A growth of 375% in the traffic capacity.
  • 120 active users per carrier, per sector.
  • Spectral efficiency takes place.