CDMA2000 is an evolution of CDMA technology that provides higher data rates and improved voice quality over CDMA. It spreads signals across a wider bandwidth and uses techniques like multicarrier modulation to support higher data rates. CDMA2000 represents a family of standards that offer both voice and high-speed data services. It provides more efficient use of spectrum and supports advanced mobile services while maintaining backward compatibility.

1. WIRELESS COMMUNICATION
BY
BAALA GAJAKREEDAN.L
CDMA 2000

2. WHAT IS CDMA???
 CDMA is a high speed data and voice network solution
for low cost easy to deploy high performance services.
CDMA can support high volume of voice and data traffic.
 Instead of being limited to narrow channel structure in a
given frequency, CDMA spreads signal across 1.25MHz
of spectrum and simultaneously transmits uniquely
encoded and encrypted signals over same RF carrier.
 Due to its efficient use of spectrum to provide high
quality voice and data services CDMA can be utilised for
fixed voice and data services.

3. CDMA 2000
 CDMA 2000 is designed to provide an evolutionary path from
cdma One (or) IS95.
 The name CDMA2000 denotes a family of standards that
represent the successive, evolutionary stages of the underlying
technology. These are:
 Voice: CDMA2000 1x,1xRTT, 1X Advanced
 Data: CDMA2000 1xEV-DO

4. 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
 Sectorization gain
 High peak data rates can be accommodated
 Combats other-user interference = lower reuse factors

5. FACTS ABOUT CDMA
 CDMA is a technology for the evolution of IS-95/IS-
95A to 3G services.
 The CDMA2000 cellular technology provides an
evolutionary high data rate upgrade path for current
users of 2G(IS-95)and 2.5G(IS-95A)CDMA technology.
 CDMA2000 represents a family of standards.
 A key component of CDMA2000 system is a new
packet core network(PCN) that allows for the delivery
of packet data with high speed and better security.

6. CONT..
 Multicarrier modulation is applied to 3G voice oriented
cellular network using CDMA technology.
 CDMA2000 employs a multicarrier operation in which a user
is allowed to use 1,3,6,9 of the CDMA one channels to
support a more reliable voice and variety of data channels.
 The main advantage of using multicarrier modulation is to
provide higher data rates for data applications, wider BW and
consequently better voice quality and backward compatibility
with existing CDMA system.
 In CDMA2000 using 16-QAM digital modulation technique
the maximum data rate is increased.

8. CDMA 2000 LOGICAL CHANNELS
 Dedicated Traffic Channel
 Common Control Channel
 Dedicated Signalling Channel
 Common Signalling Channel

9. SPREADING AND MODULATION
 Uplink – spreading via Walsh functions
 Downlink – Downlink carriers can be operated independently –
Each carrier contains a pilot – spreading via Walsh functions –
spreading factors from 4 to 256 – PN sequences and Walsh
functions on parallel carriers are the same

10. USER DATA TRANSMISSION
 Fundamental Channel is specified, with a maximum data
rate of 14.4 kbps
 For increased data rates, use one or more Supplemental
Channels
– Supplemental Channel is a parallel code channel,
separated with a different Walsh function from the
Fundamental Channel
– Supplemental Channel has a fixed spreading factor for
a given data rate

11. KEY FEATURES
 Leading performance.
 Efficient use of spectrum.
 Support for advanced mobile services.
 CDMA2000 technology are compatible with IP having
more flexibility and higher BW efficiency.
 Device selection: CDMA2000 offer the broadest
selection of mobile devices and has a significant cost
advantage.
 CDMA2000 have been designed for urban as well as
remote rural areas for fixed wireless, WLL, limited and
full mobility application in multiple spectrum bands.

12. ADVANTAGES
 Superior voice quality.
 High speed broadband data connectivity.
 Improved security and privacy.
 Multi-mode, multiband global roaming features.
DISADVANTAGES
 Channel pollution: there are too many signals from cell sites in
subscribers phone, but none is dominant –degrading call quality.
 International roaming: another disadvantage of this technology is the
lack of international roaming capabilities and only CDMA2000
device that can be used internationally must also have a GSM radio.