  In this letter, we propose a blockwise phase rotation-aided analog transmit
beamforming (BPR-ATB) scheme to improve the spectral efficiency and the
bit-error-rate (BER) performance in millimeter wave (mmWave) communication
systems. Due to the erroneous construction of the conventional transmit
beamforming, we design the BPR-ATB for achieving an efficient beam pattern and
improving the Euclidean distance. To verify the effectiveness of the proposed
BPR-ATB scheme, we employ an Alamouti coding technique at the transmitter and
evaluate the bit-error-rate performance for a mmWave multiple-input and
single-output system. The simulation results show that the proposed BPR-ATB
scheme outperforms the conventional discrete Fourier transform-based ATB
scheme.
