The Universality of Modulation (2017)

By Tom Williams, Cable Television Laboratories, Inc.

This paper examines the common properties of modulation methods that use orthogonal basis functions, including single carrier (e.g., 64-QAM or 64-state quadrature amplitude modulation), multi-carrier (e.g.,OFDM (orthogonal frequency division multiplex)), and spread spectrum. It also explains a time frequency swapping technique that reveals OFDM and single carrier modulation are duals of one another, if the time axis and frequency axis are relabeled. This time-frequency swapping technique allows new modulation candidates to be created, such as duobinary (partial response signaling) OFDM, which has valuable properties for the cable plant.

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