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CDMA Spectral Efficiency

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

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  1. CDMA Spectral Efficiency Enhancing the most secured system

  2. 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.

  3. Handset Spectral Efficiency techniques Network 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

  4. 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).

  5. Reverse Link Interference cancellation (RLIC) • Reverse link interference cancellation equally important. • Mobile transmits less power . • Increase the battery life.

  6. 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

  7. 4GV • 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.

  8. Radio Configuration • Set of forward traffic channel and reverse traffic channel • Physical layer parameters such as data rates, modulation characteristics, and spreading rates.

  9. 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

  10. 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.

  11. Network Optimization • Ec/Io optimization • Forward and reverse link imbalance • Excessive soft handoff areas • Improper RF parameters settings • Use repeaters for low utilized sectors

  12. 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

  13. Conclusion • A growth of 375% in the traffic capacity. • 120 active users per carrier, per sector. • Spectral efficiency takes place.

  14. Increase in the traffic capacity

  15. Thank You

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