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This paper calculates the capacity of wireless networks based on certain values of spectral efficiency of certain technologies. Relative to the authors' own analysis, the spectral-efficiency values used in the Citi report are incorrect to a significant degree, and hence much of the technical analysis and related conclusions are also incorrect. In particular, the bottom line conclusion that "Citi do not believe that US faces a spectrum shortage" is invalid because it is predicated on the incorrect analysis that 4G technologies have six times more capacity than they really do.
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