Hybrid Precoding Architecture for Massive Multiuser MIMO With Dissipation: Sub-Connected or Fully Connected Structures?

• Published in: IEEE transactions on wireless communications Vol. 17; no. 8; pp. 5465 - 5479
• Main Authors: Du, Jingbo, Xu, Wei, Shen, Hong, Dong, Xiaodai, Zhao, Chunming
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.08.2018; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antennas; Channels; Complexity theory; Computer simulation; Hardware; Hybrid precoding; Hybrid systems; massive multiuser multiple-input multiple-output (MIMO); Millimeter waves; MIMO (control systems); MIMO communication; Phase shifters; Precoding; quantized precoding; Radio frequency; Vector quantization
• ISSN: 1536-1276; 1558-2248
• DOI: 10.1109/TWC.2018.2844207

In this paper, we study the hybrid precoding structures over limited feedback channels for massive multiuser multiple-input multiple-output (MIMO) systems. We focus on the system performance of hybrid precoding under a more realistic hardware network model, particularly, with inevitable dissipation. The effect of quantized analog and digital precoding is characterized. We investigate the spectral efficiencies of two typical hybrid precoding structures, i.e., the sub-connected structure and the fully connected structure. It is revealed that increasing signal power can compensate for the performance loss incurred by quantized analog precoding. In addition, by capturing the nature of the effective channels for hybrid processing, we employ a channel correlation-based codebook and demonstrate that the codebook shows a great advantage over the conventional random vector quantization codebook. It is also discovered that, if the channel correlation-based codebook is utilized, the sub-connected structure always outperforms the fully connected structure in either massive MIMO or low signal-to-noise ratio scenarios; otherwise, the fully-connected structrue achieves better performance. Simulation results under both Rayleigh fading channels and millimeter wave (mm-wave) channels verify the conclusions above.