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In this letter, we propose a blockwise phase rotation-aided analog transmitbeamforming (BPR-ATB) scheme to improve the spectral efficiency and thebit-error-rate (BER) performance in millimeter wave (mmWave) communicationsystems. Due to the phase angle optimization issues of the conventional analogbeamforming, we design the BPR-ATB for reducing the rotated beamspace of theequivalent channel and improving the minimum Euclidean distance. To verify theeffectiveness of the proposed BPR-ATB scheme, we employ an Alamouti codingtechnique at the transmitter and evaluate the bit-error-rate performance formmWave multiple-input and single-output systems. The simulation results showthat the proposed BPR-ATB scheme outperforms the conventional discrete Fouriertransform-based ATB scheme.

Blockwise Phase Rotation-Aided Analog Transmit Beamforming for 5G mmWave Systems