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A large number of papers are now appearing on sixth-generation (6G) wirelesssystems, covering different aspects, ranging from vision, architecture,applications, and technology breakthroughs. With cellular systems in mind, thispaper presents six critical, yet fundamental challenges that must be overcomebefore development and deployment of 6G systems. These include: Opening thesub-terahertz (sub-THz) spectrum for increased bandwidths and the ability toutilize these bandwidths, pushing the limits of semiconductor technologies foroperation within the sub-THz bands, transceiver design and architectures torealize the high peak data rates, and realizations of sub-millisecond latenciesat the network-level to achieve the 6G key performance indicators.Additionally, since 6G systems will not be introduced in a green fieldsenvironment, backwards compatibility with existing systems is discussed. Wherepossible, we present practical solutions to realize the identified challenges.

Six Critical Challenges for 6G Wireless Systems