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It is demonstrated that codewords of good codes for the additive white Gaussian noise (AWGN) channel become more and more isotropically distributed (in the sense of evaluating quadratic forms) and resemble white Gaussian noise (in the sense of ℓp norms) as the code approaches closer to the fundamental limits. In particular, it is shown that the optimal Gaussian code must necessarily have peak-to-average power ratio (PAPR) of order log n.National Science Foundation (U.S.) (Center for Science of Information Grant CCF-0939370

&#x2113;<inf>p</inf>-norms of codewords from capacity- and dispersion-achieveing Gaussian codes

ℓ<inf>p</inf>-norms of codewords from capacity- and dispersion-achieveing Gaussian codes