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.
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