Multiuser hybrid analogue/digital beamforming for massive multiple-input–multiple-output

The authors propose a generalised multi-layer architecture for the phase shifter network (PSN) in hybrid analogue/digital beamforming (BF), which provides flexible trade-offs between the performance and implementation complexity. By changing the layer number, the authors can adjust the complexity of...

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Bibliographic Details
Published in:IET communications Vol. 10; no. 12; pp. 1464 - 1472
Main Authors: Wu, Keying, Wu, Lu, Zhang, Jianwen
Format: Journal Article
Language:English
Published: The Institution of Engineering and Technology 11.08.2016
Subjects:
64‐antenna system
adaptive signal processing
Algorithms
amplitude resolution
Analogue
analogue‐digital BF matrices
antenna arrays
array signal processing
Beamforming
Channels
Complexity
Design analysis
Digital
discrete phase shifters
effective channel
fully‐connected PSN
full‐digital BF
generalised multilayer architecture
hybrid analogue‐digital BF
ideal phase shifters
implementation complexity
interference suppression
iterative methods
massive multiple‐input‐multiple‐output system
MIMO communication
multiuser hybrid analogue‐digital beamforming
multiuser interference cancellation
performance complexity
phase shifter network
Phase shifters
radiofrequency chain
second‐order channel statistics
simple iterative algorithm
statistical analysis
theoretical analysis
two‐stage BF algorithm
iterative methods
hybrid analogue-digital BF
radiofrequency chain
ideal phase shifters
multiuser interference cancellation
analogue-digital BF matrices
multiuser hybrid analogue-digital beamforming
adaptive signal processing
simple iterative algorithm
phase shifter network
antenna arrays
effective channel
64-antenna system
fully-connected PSN
discrete phase shifters
massive multiple-input-multiple-output system
generalised multilayer architecture
amplitude resolution
MIMO communication
array signal processing
interference suppression
two-stage BF algorithm
second-order channel statistics
theoretical analysis
phase shifters
implementation complexity
full-digital BF
performance complexity
statistical analysis
ISSN:1751-8628, 1751-8636
Online Access:Get full text
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Description
Summary:The authors propose a generalised multi-layer architecture for the phase shifter network (PSN) in hybrid analogue/digital beamforming (BF), which provides flexible trade-offs between the performance and implementation complexity. By changing the layer number, the authors can adjust the complexity of the PSN and the achievable performance. A two-stage BF algorithm is adopted, in which the analogue and digital BF matrices are designed separately. Analogue BF is adaptive to the second-order channel statistics. A simple iterative algorithm is proposed to maximise an upper bound of the average rate of the effective channel after analogue BF. Digital BF is adaptive to the effective channel for multiuser interference cancellation. Both ideal phase shifters and discrete phase shifters with limited phase and amplitude resolutions are considered in the algorithm design. Theoretical analysis and simulation are used to demonstrate the good performance and flexibility of the proposed technique. In a 64-antenna system, it can use 16 radio-frequency chains to perform very closely to full digital BF with a fully-connected PSN, or achieve 70–80% performance with a simple PSN. It is also robust against the limited phase shifter resolution. It enables us to select the proper performance and implementation complexity according to the requirement and capability of real systems.
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ISSN:1751-8628
1751-8636
DOI:10.1049/iet-com.2015.0520