Claim: 64QAM, which is widely used in modern telecommunications to transmit information, has the highest crest factor among normalized waveforms.
Evidence: Quadrature amplitude modulation (QAM) is the name of a family of digital modulation methods and a related family of analog modulation methods widely used in modern telecommunications to transmit information. 64-QAM and 256-QAM are often used in digital cable television and cable modem applications.