Jeff Correia
Jeff Correia is recently retired as Chief Scientist for Wireless Communications for the MITRE Corporation where he focused extensively on Spectrum related issues between commercial cellular and DoD systems in bands recently opened for cellular. Jeff was also the Chief Engineer for the OUSDR&E 5G Dynamic Spectrum Utilization Project at Hill AFB. Jeff has supported multiple Government Sponsors in the Spectrum Area including NIST/NASCTN, DARPA, MDA, and PEO Spectrum. Jeff has lectured extensively on the 4G/5G Physical Layers with emphasis on Spectrum compatibility between systems.
Linear Algebraic Perspective on the FFT/IFFT and Its Role in the OFDM Modulations Employed in 4G/5G
Status: Available NowThis talk will be a tutorial on the Orthogonal Frequency Division Multiplexing (OFDM) Modulations and variants employed in 4G/5G and how they are parameterized via the forward/inverse Fast Fourier Transforms (FFT/IFFT). The talk will discuss the complex baseband formulation of the underlying digital modulations used via a brief introduction to quadrature amplitude modulation, its complex baseband representation, and subsequent extension into OFDM. The talk will address the FFT/IFFT properties employed in the conceptual formulation of the scheme and will motivate how thinking about the FFT/IFFT in a linear-algebraic sense can add insight into the complicated-looking structure of the FFT/IFFT and other transforms used in engineering sciences.