CDMA Online: CDMA Interactive

Welcome to the CDMAinteractive Learning Contents Index
Here you can view a listing of the modules you will see in the CDMAinteractive Membership Area. New modules on CDMA Optimization, CDMA Field Trials, 3G & CDMA2000 coming soon!

For further information
Call Space 2000 at 703-573-7008 or email: Info@cdmaonline.com

Video Auditorium Index

Video Series VS01: Fundamentals of Cellular Communications by Dr Earnest Simo

Video Series VS02: Analog Cellular Networks Operation by Dr Earnest Simo

	01- Introduction to Cellular Communications - This video segment presents an easy, but very useful, overview of cellular communications and it's applications.		01- Introduction to Cellular Operation - This video segment presents and explains a simplified overview of cellular networks operation.
	02- Frequency-Reuse and Handoffs - This video clip uses High-end computer animated graphics to explain Frequency-Reuse and Handoff concepts.		02- Mobile-To-Land Call - This video clip uses animated graphics to illustrate the call setup sequence between a Mobile Unit and Land-based party.
	03- Frequency Plan at 800 MHz - This video clip uses animated graphics to explain Frequency allocation and planning for 800MHz cellular applications.		03- Handoff and Roaming - This video clip uses High-end computer animated graphics to illustrate the Hard Handoff and Roaming concepts.
	04- Cellular System Components - This feature packed segment introduces the key elements of cellular systems. (MSC, Base stations and Mobiles)		04- Analog Cellular Trends - This concluding video setgment discusses trends in analog cellular networks operation.
	05- Conclusions and Future Trends - Here, we discuss the PCS vision and underscore the increasing role of wireless technology as we enter the 21st century.

Flash Presentations Index

CDMA Interactive Demos (Text-only)	CDMA Interactive Demos (with Audio Narration)
Performance Indicators	Performance Indicators (Audio Version)
Analog to Digital	Analog to Digital (Audio Version)
FDMA TDMA CDMA	FDMA-TDMA-CDMA (Audio Version)
Codes	Codes (Audio Version)
Reverse Link Optimization
CDMA Library Navigator

Distance Learning Q&A using Real Video Index

CDMA Network Optimization 01- Questions 1-28

	Is IS-95A delivering on its promise?
	What are some Real Benefits of CDMA over competing technologies?
	What is CDMA Network performance optimization?
	What is "Continuing Network" optimization?
	What are the various perspectives of CDMA optimization?
	What are the key system performance optimization Indicators in CDMA?
	What is "Frame Erasure Rate" or FER in CDMA Systems?.
	What are the implications of FER?
	What is the Received Signal Strength in CDMA systems? What does it represent?
	What is Ec/Io and what does it represent?
	More on Ec/Io...pilot pollution.
	How can we control pilot pollution?
	How does the Mobile measure Ec/Io?
	What is the pilot searcher? How long does it take the Mobile to scan pilots?

	How does the searcher really work?
	What is the Mobile Transmit power output? What does it represent?
	What is "closed loop power control"?
	What are the "operating power levels" for CDMA handsets?
	Flaws in the "open loop power control".
	What are the implications of the "Transmit Gain Adjust"?
	What are the implications of the "Transmit Gain Adjust" variations?
	Summary of CDMA Performance Indicators.
	How does the mobile acquire the CDMA System?
	What are the functions of the Sync Channel message?
	What are the functions of the Paging Channel?
	What occurs in the Handset during Idle Mode?
	What happens during Idle Hand-off?
	What is the reason for the Registration Message?

CDMA Network Optimization 02- Questions 29-56

	How is an incoming call established by the Mobile?
	When does the mobile know it has a call?
	What are some other Service Options available on current CDMA Systems?
	How is a normal call terminated?
	What is the purpose for notification of voice messages in CDMA call processing?
	How is a Hand-off accomplished?
	What are the typical ranges of practical values for T-add, T-drop, TT-drop and T-comp parameters?
	What are the trade-offs to be kept in mind when we set the T-add, T-drop, TT-drop and T-comp parameters too low or too high?
	Why is the TT-drop a less intuitive parameter and how do we use it in the soft hand-off process?
	What are the scanning rates on the set pilots?
	How does the Pilot Searcher operate?
	How is Hand-off accomplished?
	How many Hand-offs can occur during a call?
	What are the advantages of Soft Hand-off in a CDMA System?

	How does Soft Hand-off improve system performance?
	Is Soft Hand-off a unique feature that makes CDMA the system it is today?
	How does Power Control work in a CDMA System?
	How does Forward Link Power Control work?
	Who or what sets the power level of the Mobile?
	What parameter settings affect Power Control?
	How does Reverse Link Power Control work?
	How is Power Control regulated?
	How is Network Optimization accomplished?
	How complex is the CDMA Optimization problem?
	How important is Drive Testing in CDMA System Optimization?
	How can call processing messages be used for System Optimization?
	How does Layer 3 messages help in debugging the system?
	What are some other messages (other than layer 3) in a CDMA System?

CDMA Network Optimization 03- Questions 57-80
All new answers in video streaming and graphics posted in July 2000.

	How does the CDMA Mobile acquire the System?
	How does a Mobile Phone, on the right frequency, acquire the System?
	After finding the strongest PN out there, how does the Mobile actually aquire the Sytem?
	What is contained in the Sync Channel Message?
	What messages are on the Paging Channel?
	What is the purpose of the Access Parameters Message?
	What is the System Parameters Message?
	What is the purpose of the CDMA Channel List Message?
	What is the Neighbor List Message?
	What is the Extended System Parameters Message?
	What is the Global Service Redirection Message?
	How is the Idle Mode Handoff Accomplished?

	Why do Mobiles register?
	What is a Registration Message?
	How does a Mobile know when it has an incoming call?
	How does a Mobile that has been paged respond to an incoming call?
	How does the Mobile know which traffic channel to use?
	What does a Mobile do when it arrives on it's Traffic Channel?
	What is a Service Option? When is it chosen and who chooses it?
	When does the Phone actually start ringing?
	How does the System know when a call is answered at the Mobile?
	How do you end a CDMA call?
	How does the Mobile begin an outgoing call?
	What happens after an Outgoing Call is assigned to a Traffic Channel?

CDMA Network Optimization 04- Questions 81-115
All new Answers posted in September 2000.

	What is Performance Optimization?
	What resources are available for investigating call failure or call processing troubles?
	What are some good Performance Indicators?
	Let's look at Performance Indicator number one.
	What are the symptoms of Frame Erasure Rate?
	Let's look at Mobile Received Power as a performance indicator.
	Let's look at Ec/Io as a perfomance indicator.
	How does Ec/Io vary with distance and how can it be used to guide the handoff process?
	Let's look at Handset Transmitter Power as a performance indicator.
	Let's look at Closed Loop Transmit Gain Adjust as a performance indicator.
	What is the signature of a Successful Call?
	What is a signature of poor coverage?

	What is the signature of Forward Link Interference?
	How does Reverse Link Interference affect the call process?
	Let's look at a spectacular CDMA accident.
	What's inside a CDMA phone?
	What are Pilot Sets?
	Why do we have Pilot Sets and how do we maintain them?

	How do Pilots move from set to set?
	How does the Mobile decide that it wants to handoff?
	How does the Mobile request a handoff?
	How does the System authorize a handoff?
	How does the Mobile implement a handoff that it has been told to do so?
	How does the Mobile learn about new Neighbors after new sectors are added in a handoff?

Interactive Workshops Index

	01-FDMA vs TDMA vs CDMA - This interactive presentation describes, explains, discusses and illustrates the following topics: The Multiple Access [MA] Problem Frequency Division Multiple Access Time Division Multiple Access Code Division Multiple Access
	02-An Introduction to Codes - This interactive presentation describes, explains, discusses and illustrates the following topics: Simple Codes Concept Examples Synchronization Concept Spreading Codes Concept
	03-Analog-to-Digital Conversion - This interactive presentation describes, explains, discusses and illustrates the following topics: Nyquist Sampling Uniform and Non-Uniform Quantization Encoding Samples into Bits Speech Compression

	04-PCS: A Telecommunications Revolution - This interactive presentation describes, explains, discusses and illustrates the following topics: Historical Perspectives PCN: A Telecommunications Revolution Traditional Cellular Vs. PCN PCN Elements PCS: Promise or Challenge Conclusions
	05 - PN Sequences Part 1 - This interactive presentation describes, explains, discusses and illustrates the following topics: Definition and Generation The Short PN and the Long PN Codes Some Useful PN Codes Properties Correlation Workshop Orthogonal Sequence Correlation Workshop
	06 - PN Sequences - Part 2 - This interactive presentation describes, explains, discusses and illustrates the following topics: Using the Short PN Code Using the Long PN Code PN Sequences and Generators

3G Tech Talk Index

	01-From Here to There: A Migration Scenario - A Possible Overlay Migration Path 2G vs 2.5G vs 3G Handset Compatibility
	03- CDMA2000: The Forward Link Channels - Forward Link Description The Forward Common Channels Forward Link: Five General Configuration Stages Variable Length, Complex Walsh Codes Are Used

	02-Possible 3G Configuration Scenarios - Chip Rates & Spreading Rates & Bandwidth Multi-Carrier versus Direct Spread 5 MHz Configuration 10 MHz Configuration
	04-Coming Soon! -

2G Interactive Index

This section contains instructional material from Space 2000 live Seminar S2K180. Its
focus is IS-95 implementation and operational issues. Select a module below to begin.

	This module contains discussions on Wireless Cellular Networs background and an introduction to Psueodo-random Noise Sequences, or PN Sequences.
	This module discusses how PN codes are used in IS-95 Systems. It contains some key chracteristics of PN Codes and shows how the Long PN codes and the short PN codes are used in IS-95 Systems.
	Coming Soon: This module introduces the concept of Power Control and Power Control strategies and its effect on the Near-Far problem in the forward and reverse links.
	Coming Soon: This module describes Open Loop and Closed Loop Power Control and the effect it has on communications between the Mobiles and the Base Station.
	Coming Soon: This module discusses the functions of the forward link Pilot and Synchronization channels.
	Coming Soon: This module discusses the functions of the forward link Paging and Traffic channels.
	Coming Soon: This module explains Logical Channels and Physical Channels and discusses how the logical channels in the Reverse Link are organized into the Access Channel and the Reverse Traffic Channels, characterized by a subset of the Long PN offsets.
	Coming Soon: This module describes the Reverse Traffic channel characteristics and discusses the functions of the Vocoder, the Encoder, the symbol Repetition device, the Walsh Modulator and the Data Burst Randomizer (DBR) in the block diagram.

If you have any Comments, Questions or Problems , please don't hesitate to contact us 703-573-7008 or e-mail Info@cdmaonline.com

CDMA Forums

Seminars

Interactive

Site Map

Home