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CDMA Training

CDMA Training

CDMA TRAINING COURSE INTRODUCTION: 

CDMA (Code Division Multiple Access) is a channel access method used by various radio communication technologies. This is example of multiple accesses, which is where several transmitters can send information simultaneously over a single communication channel. CDMA Training allows several users to share a band of frequencies. To permit this to be achieved without undue interference between the users.

CDMA Training is designed to provide a general overview of strategic or technical managers, consultants, communications professionals, software engineers, IT professionals , and who plan on using , evaluating or working with the CDMA wireless networks, applications and services.

 

Prerequisites:

  • Attendees need basic networking knowledge.

CDMA Training Course Content

CDMA Review
  • IS-95 Orientation
  • North American standards (TIA)
  • Basic CDMA
  • Spectrum Spreading Process
  • Code Division Multiple Access
  • RAKE receiver
  • Soft handoffs concepts in CDMA Training
  • Single user-Single path
  • Single user- Multiple paths
  • Multiple users with single paths
  • Multiple users with Multiple paths
  • Multipath and Rake receivers
  • CDMA vs. Analog FDMA
  • CDMA vs. TDMA
CDMA Training system overview
  • Locating and keeping track of a MS
  • Mobility management
  • Radio resource management
  • Features in a CDMA cellular system
  • Soft hand-offs
  • Power control
  • Forward and reverse links
  • Long and short codes
  • CDMA Channels
  • CDMA physical channels
  • CDMA logical channels
  • Shared vs. dedicated channels
  • Forward and Reserve logical channels
  • CDMA Physical Layer
  • CDMA protocol layering
  • Forward channels
  • Reverse channels
PN Codes and Walsh Functions
  • IS-95 features
  • Pseudo Random (PN) codes
  • Orthogonal codes
  • Short PN codes
  • Long PN codes-CDMA Training
  • Walsh functions
The Forward Link
  • The Pilot channel
  • The Sync channel
  • The Paging channel Concepts in CDMA Training
  • Forward traffic channels
  • Call and signaling states
The Reverse Link
  • The Access channel
  • The Reverse traffic channels
  • Orthogonal modulator
  • Long codes
Forward Traffic Channels
  • Forward link structure
  • Variable rate code-CDMA Training
  • Power control channel
Power Control
  • The near-Far problem
  • Need for power control concepts in CDMA Training
  • Open loop power control (Reverse Link)
  • Closed loop power control (Reverse Link)
  • Forward link power control
  • Power control implications and tradeoffs
CDMA Network Architecture
  • Basic structure
  • Switching Functions
  • BSC Functions
  • BTS Functions
  • Forward features
CDMA Subscriber Unit Architecture
  • Basic structure
  • Vocoder operation
  • Transmitter operation
  • Receiver operation
  • Hand off protocol & messaging
Mobile Station
  • Control on the traffic channel state
  • Forward traffic channel power control
  • Service options
  • Acknowledgment procedures
  • Processing the in-traffic system parameters message
  • Alerting
  • Conversation substate
  • Release substate
  • Mobile station states-CDMA Training
  • Paging channel monitoring procedures
  • Acknowledgments
  • Registration
  • Idle handoff
  • Paging channel messages
  • System Parameters message
  • Access Parameters message
CDMA Call Processing
  • Call processing flows
  • Registration
  • Utilized services
Handoffs
  • Within one CDMA system
  • Multi-cell (soft) Handoff
  • Multi-Sector (softer) Handoff
  • CDMA to CDMA hard handoffs
  • CDMA to Analog hard Handoff
  • Handoff thresholds
  • Trade-offs and implications
  • Handoff Procedures
  • Pilot sets as a part of CDMA Training
  • Pilot search
  • Handoff messages
  • Set maintenance
  • Power control during soft handoff
  • Soft handoff scenarios
Registration
  • Forms of registration
  • Systems and networks roaming
  • Registration timers and indicators
  • Registration procedures
CDMA Training System Capacity
  • Key capacity parameters
  • Derivation and discussion
  • Soft capacity increase
  • CDMA vs. FDMA vs. TDMA capacity
  • System design and implementation issues
  • Transition planning from analog to CDMA
  • Field trials results
CDMA Evolution
  • CDMA standards
  • Future of CDMA-CDMA Training
  • Status of Cdma2000

What is CDMA?

  • Code Division Multiple Access (CDMA) is a digital cellular technology used for mobile communication. CDMA is the base which access methods such as cdmaOne, CDMA2000 , and WCDMA are built. CDMA cellular systems are demand superior to FDMA & TDMA, which is why CDMA plays a critical role in building efficient, robust, and secure radio communication systems.
  • CDMA in the world of mobile technology, The Code-Division Multiple Access in short called as CDMA. In CDMA Training you will learn how the name refers to technology which is having capability to send multiple calls at the same time, and opposed to the  alternative technologies that transmit each signal via its own time slot on a certain channel. Instead of using this kind of time division system, which requires receiving device to pick apart & reunify only the intended message, CDMA sends many messages, each encrypted with an unique code.
  • The CDMA can send 10 times as many as messages, the time division technology, because compatible of device having the ability to identify one set of data intended for its reception. Join for CDMA Training and explore how it is used in the cell phone reception, it operates on the frequency bands 800 & 1900 & it is known within the industry as IS-95 CDMA, CDMAOne, or the  CDMA2000. Today, the CDMA offers users speeds of 3.6 megabits per second (Mbps) & serves clients with 2G & 3G phone capabilities.

There are Two types of CDMA:

Frequency-Hopping

  • Each user’s narrowband signal hops among discrete frequencies, & the receiver follows in sequence
  • The Frequency-Hopping Spread Spectrum (FHSS) CDMA is NOT currently used in the wireless systems, although used by militarys. More we will explore as a part of CDMA Training

Direct Sequence

  • The narrowband input from an user is coded (“spread”) by an user-unique broadband code, then transmitted
  • broadband signal is received; receiver knows, applies user’s code, recovers the users’ data
  • Direct Sequence Spread Spectrum(DSSS) CDMA IS the method used in the IS-95 commercial systems.
CDMA: Multiple users occupying the same band by having different codes is known as CDMA – Code Division Multiple Access system

Let

W – spread bandwidth in Hz

R = 1/Tb = Date Rate

S – received power of the desired signal in W

J – received power for undesired signals like multiple access users, multipath, jammers etc in W

Eb – received energy per bit for the desired signal in W

N0 – equivalent noise spectral density in W/Hz 7/30/2015 37EE 583 Code Division Multiple Access

The  multiple acc ess in CDMA: each user is assigned an unique PN code,where each user transmits its information by spreading with the unique code, here the direct sequence spread spectrum is used. And the users are separated by code but not by the time slot & frequency slot.

Objectives for CDMA Online Training:
    • Spread Spectrum Techniques and Architecture
    •  CDMA will be the dominant Mobile Telephone Technology
    • Why CDMA Has Grown Rapidly
    • Why CDMA is preferred Technology for Next Generation Systems
    • CDMA Training: Key Enable for Wireless Internet
    • Overview of the CDMA call processing and signalling
    • Overview of the CDMA2000 and 1xEV-DO