In late 2001, Bill Gates was having dinner with a group of journalists on the night
before Microsoft’s launch of the Windows XP operating system. At that time, the
dotcom crash was just unfolding, and during dinner, Bill Gates said (correctly) that
the dotcom bubble was a distraction and caused a lot of money to be wasted on
things that did not offer much innovation. Then Mr. Gates was asked if anything significant came out in the last few years.
“People will look back and say, ‘Wow, at least they did 802.11,’” he was quoted
as replying .
He is right. Most of us today cannot imagine working (and living) without
802.11-based wireless networks, popularly known as Wi-Fi. Traveling professionals
who really needed to send an e-mail and who had to drive around town looking
for a hot spot can attest to the technology’s importance. At the end of the twentieth
century and the beginning of the twenty-first century, people became used to highspeed
wireless networking in the local area (i.e., hot spots). Similarly, as the twentyfirst
century progresses, we will become used to high-speed mobile networking in
the wide area (i.e., everywhere).
This book is designed as a broad examination of orthogonal frequency division
multiplexing (OFDM) and orthogonal frequency division multiple access
(OFDMA), which are fast becoming the de facto methods of transmission at the
physical layer in broadband mobile systems. The associated functions necessary to
support OFDM and OFDMA at layer 2 are also addressed. This book focuses on
system analysis, design, and engineering of an OFDMA-based system, and it deals
with both the theory and the application of OFDMA in the context of a broadband
mobile wireless network. To the extent possible, based on the analysis of OFDMA,
this book develops and presents applicable design frameworks in different areas of