Limited Feedback Hybrid Precoding for Multi-User Millimeter Wave Systems

Antenna arrays will be an important ingredient in millimeter-wave (mmWave) cellular systems. A natural application of antenna arrays is simultaneous transmission to multiple users. Unfortunately, the hardware constraints in mmWave systems make it difficult to apply conventional lower frequency multi...

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Veröffentlicht in:IEEE transactions on wireless communications Jg. 14; H. 11; S. 6481 - 6494
Hauptverfasser: Alkhateeb, Ahmed, Leus, Geert, Heath, Robert W.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York IEEE 01.11.2015
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
Algorithm design and analysis
Algorithms
Antenna arrays
Array signal processing
Beamforming
Cellular
Channels
Feedback
Hardware
limited-feedback
Mathematical analysis
Millimeter wave communication
MIMO
multi-user hybrid precoding
Radio frequency
Training
multi-user hybrid precoding
Millimeter wave communication
limited-feedback
ISSN:1536-1276, 1558-2248
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Zusammenfassung:Antenna arrays will be an important ingredient in millimeter-wave (mmWave) cellular systems. A natural application of antenna arrays is simultaneous transmission to multiple users. Unfortunately, the hardware constraints in mmWave systems make it difficult to apply conventional lower frequency multiuser MIMO precoding techniques at mmWave. This paper develops low-complexity hybrid analog/digital precoding for downlink multiuser mmWave systems. Hybrid precoding involves a combination of analog and digital processing that is inspired by the power consumption of complete radio frequency and mixed signal hardware. The proposed algorithm configures hybrid precoders at the transmitter and analog combiners at multiple receivers with a small training and feedback overhead. The performance of the proposed algorithm is analyzed in the large dimensional regime and in single-path channels. When the analog and digital precoding vectors are selected from quantized codebooks, the rate loss due to the joint quantization is characterized, and insights are given into the performance of hybrid precoding compared with analog-only beamforming solutions. Analytical and simulation results show that the proposed techniques offer higher sum rates compared with analog-only beamforming solutions, and approach the performance of the unconstrained digital beamforming with relatively small codebooks.
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ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2015.2455980