cdma spectral efficiency
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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CDMA Spectral EfficiencyEnhancing the most secured system
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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.
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Spectral Efficiency techniques
Network Handset 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
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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).
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Reverse Link Interference cancellation (RLIC)
Reverse link interference cancellation equally important.
Mobile transmits less power .
Increase the battery life.
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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
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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.
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Radio Configuration Set of forward traffic channel and reverse traffic
channel Physical layer parameters such as data rates,
modulation characteristics, and spreading rates.
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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
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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.
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Network Optimization
Ec/Io optimization
Forward and reverse link imbalance
Excessive soft handoff areas
Improper RF parameters settings
Use repeaters for low utilized sectors
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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
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Conclusion
A growth of 375% in the traffic capacity. 120 active users per carrier, per sector. Spectral efficiency takes place.
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Increase in the traffic capacity
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Thank You