It is a great time to be a technician using technology. Work done in the field is getting easier, more efficient and more accurate as the tools we use get smaller, faster and more precise. And we can perform new functions in ways we might not have imagined five years ago. Asset tracking, inventory and cloud computing are three of the strongest application trends in 2013.
OFDM stands for Orthogonal Frequency Division Multiple Access. OFDM is a multicarrier technique in which information to be transmitted is mapped onto several parallel orthogonal sub-carriers. OFDM when combined with Frequency Division Multiple Access (FDMA) or Time Division Multiple Access (TDMA) or a mix of both, can be used for multiple access.
Seeds of today’s mobile communication were laid down in 1947 when the AT&T for the first time introduced the cellular concept of reusing radio frequency. Today, the cellular concept is fundamental to almost all mobile communication technologies.
This article provides an overview of the radio transmission technologies used in mobile cellular communication, right from 1G to 4G.