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OFDM/OFDMA Audio Visual Tutorial for WiFi and WiMAX

For the PDF file for Each Video Presentation click here .

 

OFDM Tutorial Summary

The OFDM Tutorial goes in depth into the theory and implementation of OFDM wireless communication systems. Starting with the treatment of multipath fading channels, OFDM is introduced as a bandwidth efficient robust communication system for multipath fading channels. Using IEEE 802.11a as a basis, a full OFDM system is described in both theory and implementation. In particular, detailed description of acquisition including packet detection, timing synchronization, carrier frequency offset estimation and correction and channel estimation and equalization is presented along with implementation details.

A full development of 256 point FFT based OFDM in WIMAX and IEEE 802.16-2004 is presented. This includes the description of Time Division Duplex(TDD) and ranging.

OFDMA as implemented in IEEE 802.16-2004 and scalale OFDMA is fully developed.

The tutorial also includes full description on Forward Error Correction (FEC) including Convolutional Encoding and Viterbi Decoding and an introduction to Reed-Solomon coding.

The Audio Visual OFDM Tutorial includes many aspects of System Engineering related to the design of OFDM systems. A direct conversion receiver and transmitter are developed including full descriptions of the tight interaction of the baseband and the analog Radio. This includes Automatic Gain Control (AGC) and tradeoffs in complexity between the Radio and Baseband.

Both large scale and small scale (microscopic) aspects of the multipath fading channel are covered, This includes the Stanford University Interim (SUI) channel models for fixed wireless access networks and models for mobile wireless access. A full development of fading due to vehicle motion including the derivation of the doppler power spectral density is presented.

The material is fully referenced.

Highlights

Item	Description
1	Audio Visual Tutorials for Individual Topics plus PDF files for each subject.
2	Theory and implementation
3	IEEE 802.11a, IEEE 802.16-2004, IEEE 802.16e.
4	Full development of OFDM with Acquisition.
5	OFDMA as implemented in WiMax (IEEE 802.16-2004, IEEE802.16e) .
6	System Engineering for OFDM.
7	Complete description and tutorial on Convolutional Encoding with Viterbi Decoding.
8	Introduction to Reed Solomon Coding.
9	Downloadable for off-line viewing
10	Easy to follow but Includes in depth technical development.
11	References provided for further detail.

 

Audience

The Audio Visual OFDM/OFDMA Tutorial will enable you to speed up OFDM product design, understand the issues involved in designing OFDM/OFDMA systems and interact between team members in the course of product development and network deployment.

Professional	Benefits
System Engineers	The tutorial leaves no stone unturned. The sections on acquisition and AGC and impairments should be of great value in designing OFDM systems to meet requirements.
Architects	Whether experienced in OFDM or newly responsible for the architecture of an OFDM communication system, this tutorial has all the theory and implementation to kick start the project
MAC Embedded Software Developers	Get a head start on development with in depth coverage of physical layer for OFDM and OFDMA.
RTL Designers	Now you can get all the theory and implementation that is the basis for developing and integrating RTL blocks in an OFDM/OFDMA system.
Architecture Verification	With the material provided you can understand what needs to be done to verify Silicon Designs based on OFDM. Especially, by better understanding acquisition within a multipath environment and also AGC you can focus on tests vectors that verify designs over multipath fading channels, and with jammers. With a fundumental understanding of OFDM based designs, Verification Engineers Can Better Target Tests and Also Understand Test Results.
Network Design and Deployment Engineers	System Engineering/Multipath Channel Models/Path Loss/Sensitivity, SNR. Insight into how Physical Layer impacts performance.
Project Managers	Get an overview of a complete block by block description of an OFDM system so that you can better manage the project. Also since the concepts are described in detail you can get a better grip on OFDM and OFDMA in order to cover all the basis in product development and better interact with your team.
Marketing and Sales	See how OFDM and OFDMA are able to provide robust and reliable communication over wireless multipath fading channels. Grasp the concepts behind OFDM and OFDMA.

 

 

 

OFDM/OFDMA AV Tutorial Outline

 

OFDM with IEEE 802.11a Implementation

Topic	Duration
Introduction	0:25:00
Multipath Fading Channels	0:29:18
Digital Communications Basics	1:45:18
OFDM (Orthogonal Frequency Division Multiplex)	1:40:58
Intersymbol Interference and Equalization	0:22:60
Cyclic Prefix for OFDM	0:39:28
Frequency Domain Equalization	0:05:43
Physical Layer Frame Organization	0:18:01
Carrier and Pilot Allocation	0:07:34
Carrier Frequency Offset(CFO) Estimation and Correction	0:40:16
Packet Detection and Synchronization	0:36:08
Forward Error Correction (FEC) Convolutional Encoding and Viterbi Decoding	1:06:03
Puncturing	0:17:37
Interleaving	0:22:52
Pilot Tracking	0:50:17

 

IEEE 802.16-2004 and IEEE802.16e

Topic	Duration
WirelessMAN-OFDM Physical Layer (256 Point FFT)	1:08:05
WirelessMAN-OFDMA Physical Layer	1:35:25
Scalable OFDMA	0:21:11
Introduction to Reed-Solomon Coding	0:58:29

 

Channel Models

Topic	Duration
Mobile Fading Channel (Doppler Spread)	0:27:27
Channel Models for IEEE 802.16 Fixed and Mobile Wireless Access Networks	0:32:28

 

System Engineering

Topic	Duration
Direct Conversion Receiver	0:32:20
ADC Requirements	0:23:39
Adjacent Channel Interference	19:49
SNR and Noise Figure	0:26:28
Transmitter	0:25:17
Phase Noise	0:15:37

 

 

 

 

Instructor

 

 

Guided Tour