Overview of the 3GPP Long Term Evolution Physical Layer
This app note gives an overview of the physical layer (radio) aspects of Long Term Evolution (LTE) plans for cellular systems. It provides a good summary of the important concepts.
Orthogonal Frequency Division Multiplexing (OFDM) is an application of frequency division multiplexing where the adjacent signals are separated by a frequency that is the inverse of the symbol duration period. This gives the signals the special property that they are "orthogonal" to each other, eliminating crosstalk between them. In terms of spectral energy, a null will occur where each neighboring signal is located.
See also: Wikipedia article
This app note gives an overview of the physical layer (radio) aspects of Long Term Evolution (LTE) plans for cellular systems. It provides a good summary of the important concepts.
This tutorial offers an explanation of the concepts behind orthogonal frequency division multiplexing (OFDM).
A collection calculators, such as:
Web apps are utilized in the tutorials to allow you to experiment with the concepts
In this 5th Edition, the author continues to evaluate various novel techniques and design methods for the modulation and transmission of digital data, allowing the readers to gain a firm understanding of the processes needed to effectively design wireless data link communication systems. Since the author regularly runs industry seminars based on this book, he is continuously updating the book material. This edition includes thorough updates of all chapters including all concepts and revised and new figures.
The stated purpose of this tutorial from the University of Edinburgh is to give a simple introduction to Orthogonal Frequency Division Multiplexing. This is a somewhat technical OFDM demo.