  This paper tackles the problem of single-user multiple-input multiple-output
communication with 1-bit digital-to-analog and analog-to-digital converters.
With the information-theoretic capacity as benchmark, the complementary
strategies of beamforming and equiprobable signaling are contrasted in the
regimes of operational interest, and the ensuing spectral efficiencies are
characterized. Various canonical channel types are considered, with emphasis on
line-of-sight settings under both spherical and planar wavefronts, respectively
representative of short and long transmission ranges at mmWave and terahertz
frequencies. In all cases, a judicious combination of beamforming and
equiprobable signaling is shown to operate within a modest gap from capacity.
