Phase offset compensation methods and applications in beam codebook generation

Due to the short wavelength of mmWave channel in 5G, the size of antenna array becomes reduced and beamforming has been thus adopted in mobile handsets. To enable the beamforming, the phase shifter is necessary to control the phases from different antenna elements. However the phase shifter can have non-ideal phase and non-identical gain responses over the antenna elements and phase codes. To consider such impairments in practice, we suggest the code search algorithm using low-complexity measurement for desired beam directions and its applications in beam codebook generation. Using the numerical simulation, it is shown that the spherical coverage can be improved by the proposed procedure using the combination of modelling and measurements.