CHAPTER Agile transmission techniques Srikanth Pagadarai 1 , Rakesh Rajbanshi 2 , Gary J. Minden 3 , and Alexander M. Wyglinski 1 1 Worcester Polytechnic Institute, United States 2 Cisco Systems, United States 3 The University of Kansas, United States 6 6.1 INTRODUCTION In Chapter 3, the physical (PHY) layer fundamentals concerning the use of orthog- onal frequency division multiplexing (OFDM) are described. Several underlying principles and the resulting advantages confirm the efficiency with which OFDM