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IEEE COMSOC CHAPTER TECHNICAL TALK – The ABCs of Orthogonal Frequency Division Multiplexing (OFDM) Part I

March 18 @ 6:30 pm - 8:15 pm

This is Part I of a Two Part Talk on OFDM. The abstract below is for both Part I and II: The main benefit of OFDM is its ability to cope with severe multipath channel conditions without the need for complex equalization filters. How does it accomplish this? The short answer: by “dividing and conquering.” It partitions a high-data-rate signal into smaller low-data-rate signals so that the data can be sent over many low-rate sub-channels. The Time/Frequency relationships are presented with a figure that facilitates a straightforward understanding of the OFDM partitioning process. We emphasize the important role of the cyclic prefix (CP). We show how it allows us to change linear convolution into circular convolution, thereby purging any transients, which helps to maintain waveform orthogonality at the receiver. OFDM waveform synthesis is covered in detail. Also, the spectral properties of Real and Imaginary signals are reviewed. We further consider the peak-to-average power ratio (PAPR) in OFDM, and how the desire for small PAPR has given rise to a special variant of OFDM called single-carrier OFDM (SC-OFDM). Finally, we illustrate applications of this elegant technology in standards such as 802.11 and LTE. Speaker(s): Dr. Bernie Sklar, Agenda: 6:30-6:45 (PST) PM Virtual Social 6:45-8:15 (PST) PM Presentation 8:15-8:30 (PST) PM Q&A Thousand Oaks, California, United States, Virtual: https://events.vtools.ieee.org/m/262902