01-04-2014, 03:22 PM
CDMA DEPLOYMENT GUIDELINES
CDMA DEPLOYMENT.pptx (Size: 329.41 KB / Downloads: 13)
Why 3G?
Higher bandwidth enables a range of new applications!!
For the consumer
Video streaming, TV broadcast
Video calls, video clips – news, music, sports
Enhanced gaming, chat, location services…
For business
High speed telenetworking / VPN access
Sales force automation
Video conferencing
Real-time financial information
WHY CDMA?
Higher capacity
Improved performance in multipath by diversity
Lower mobile transmit power = longer battery life
Power control
Variable transmission rate with voice activity detection
Allows soft handoff
Sectorization gain
High peak data rates can be accommodated
Combats other-user interference = lower reuse factors
Cdma 2001x
Supports theoretical data rates of up to 307 kbps, with generally experienced rates of 144 kbps
The newly introduced Q-PCH of CDMA 2000 enables the mobile to be informed about when it needs to monitor F-CCCH and the Paging Channel, thus improving on the battery life
Introduction of Radio Configurations – Transmission formats characterized by physical layer parameters such as data rates, modulation characteristics, and spreading rate. RCs help in providing for additional data rates.
Quality and Erasure indicator bits (QIB and EIB) on the reverse power control sub channel. These help in indicating to the BS about bad frames or lost frames received at the mobile station, so that they can be retransmitted
Code channels are transmitted at full data rates during a data burst
Convolution and Turbo coding techniques used
Modulation technique used is QPSK
CDMA 2000 1XEVDV
Backward compatible with CDMA 2000.
EV-DV can be easily extended to operate in 3x mode under the framework of current system.
Forward peak data rate : 3.072 Mbps.
Reverse peak data rate: 451.2 kbps.
Addition of three new channels to f/w link and reverse link for packet data operation and its support.
Adaptive modulation and coding : QPSK, 8- PSK, 16-QAM
Variable frame duration
Mobile station can select one of N base stations.
DTX transmission supported for saving battery life.