Abstract
This paper proposes a hybrid precoding technique based on multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) system to improve bit error rate (BER) performance in hybrid beamforming system. The conventional hybrid beamforming system cannot outperform the performance of full-digital beamforming system in OFDM. In the proposed algorithm, the analog precoding matrices are designed by iterative algorithm and one proper analog precoding matrix with the highest power of hybrid precoder is selected to achieve the highest performance. According to the number of analog precoding matrices, the diversity gain is increased and the performance is improved. The simulation results show that the BER performance and average sum rate for the proposed scheme are higher than the conventional hybrid beamforming system.
Highlights
The beamforming is the representative technique of 5G technology for extensive capacity enhancement
The simulations in this paper are performed on the multiple input multiple output (MIMO)-OFDM system with sub-connected and full-connected structure of hybrid beamforming system
The final hybrid precoding matrix is selected by the smallest weight of analog and digital precoding matrices
Summary
The beamforming is the representative technique of 5G technology for extensive capacity enhancement. Conventional work [19] studied the alternating optimization algorithm of wideband analog precoding matrices and narrowband digital precoding matrices in order to maximize the spectral efficiency. The analog precoding matrix is designed by iterative schemes and one proper analog precoding matrix with the highest power of hybrid precoding matrix is selected to achieve the optimal performance of hybrid beamforming in wideband MIMO-OFDM. The proposed algorithm improves the performance of BER and spectral efficiency of conventional hybrid beamforming system in order to approach full-digital beamforming system with the limited number of antennas. High cost and power consumption constrain the usage of large number of antenna in hardware hybrid beamforming system In this proposed paper, the same number of antenna array is used in both full-digital and hybrid beamforming system in order to demonstrate the improvement of the performance. Two kinds of hybrid beamforming structures, tranceiver structure and channel model are described
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