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In this paper, the performance of indoor Terahertz (THz) communicationsystems with one-bit digital-to-analog converters (DACs) is investigated.Array-of-subarrays architecture is assumed for the antennas at the accesspoints, where each RF chain uniquely activates a disjoint subset of antennas,each of which is connected to an exclusive phase shifter. Hybrid precoding,including maximum ratio transmission (MRT) and zero-forcing (ZF) precoding, isconsidered. The best beamsteering direction for the phase shifter in the largesubarray antenna regime is first proved to be the direction of theline-of-sight (LOS) path. Subsequently, the closed-form expression of thelower-bound of the achievable rate in the large subarray antenna regime isderived, which is the same for both MRT and ZF and is independent of thetransmit power. Numerical results validating the analysis are provided as well.

Performance Analysis of Indoor THz Communications with One-Bit Precoding