Hybrid beam selection scheme in millimeter-wave beamspaceMIMO-NOMA with lens antenna array
Beam selection is a notable issue for recent wireless communications. A conventional single beamselection (SBS) concept is utilized to minimize the number of necessary radio frequency chains inmillimeter-wave (mmWave) multiple-input multiple-output non-orthogonal multiple access(MIMO-NOMA) systems. In general, the traditional SBS concept cannot implement a multiple beam groupselection opportunity for every supported user. In this circumstance, the user side spends too muchcomputational burden to measure the decoded message and suffer a beam optimization problem.Therefore, we propose a hybrid beam selection (HBS) scheme to utilize a multiple SBS scheme inbeamspace MIMO-NOMA systems. Consequently, each supported user can easily achieve a low beamoptimization problem by selecting a reliable SBS group from the proposed HBS scheme and significantlyincrease the spectral performance. Furthermore, we demonstrate an iterative beam power maximizationalgorithm utilizing the HBS scheme to solve the power allocation problem in this paper. The numericalresults are verified by computer simulations in terms of a downlink beamspace MIMO-NOMA channelwith a lens antenna array environme
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