Abstract
Hybrid precoding achieves a compromise between the sum rate and hardware complexity of millimeter wave (mmWave) massive multiple-input multiple-output (MIMO) systems. However, most prior works on multi-user hybrid precoding only consider the full-connected structure. In this paper, a novel multi-user hybrid precoding algorithm is proposed for the sub-connected structure. Based on the improved successive interference cancellation (SIC), the analog precoding matrix optimization problem is decomposed into multiple analog precoding sub-matrix optimization problems. Further, a near-optimal analog precoder is designed through factorizing the precoding sub-matrix for each sub-array. Furthermore, digital precoding is designed according to the block diagonalization (BD) technology. Finally, the water-filling power allocation method is used to further improve the communication quality. The extensive simulation results demonstrate that the sum rate of the proposed algorithm is higher than the existing hybrid precoding methods with the sub-connected structure, and has higher energy efficiency compared with existing approaches. Moreover, the proposed algorithm is closer to the state-of-the-art optimization approach with the full-connected structure. In addition, the simulation results also verify the effectiveness of the proposed hybrid precoding design of the uniform planar array (UPA).
Highlights
The high-speed and low-latency characteristics of the fifth generation (5G) are the biggest differences from previous communication systems
We focus on the sub-connected structure design of hybrid precoding in mmWave massive MU-multiple-input multiple-output (MIMO) systems, where the single base station (BS) with multiple sub-arrays serves several multi-antenna users simultaneously
We evaluate the performance of the proposed hybrid beamforming schemes with the sub-connected structure in multi-user MIMO (MU-MIMO) systems, the corresponding simulation results are described below [38]
Summary
The high-speed and low-latency characteristics of the fifth generation (5G) are the biggest differences from previous communication systems. Many emerging technologies, such as physical layer technology, network densification technology, etc. The key problem in the technical development of communication systems today is the shortage of spectrum. Millimeter-wave (mmWave) provides new spectrum resources for wireless communication systems and satisfies the bandwidth requirements for 5G services [5, 6]. MmWave large-scale multiple-input multiple-output (MIMO) technology with shorter. Du et al J Wireless Com Network (2021) 2021:157 wavelengths can package large-scale antennas into small sizes. Hybrid beamforming technology improves link reliability by compensating for severe mmWave path losses
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More From: EURASIP Journal on Wireless Communications and Networking
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