Journal ArticleDOI
Low-Complexity Subspace-Based Multi-User Hybrid Precoding
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A novel multi-user hybrid precoder design that imitates the bit error rate (BER) performance of a given fully digital precoder by minimizing the Frobenious norm between them is proposed.Abstract:
We propose a novel multi-user hybrid precoder design that imitates the bit error rate (BER) performance of a given fully digital precoder by minimizing the Frobenious norm between them. We show that the proposed design equivalently minimizes the chordal distance between the column spaces of the phase-only RF precoder and the given fully digital precoder. The proposed design, in the large antenna regime, has the same BER as that of an existing optimal hybrid precoder design but with much reduced complexity. Furthermore, the proposed design is also shown to approach the BER of a given fully digital precoder.read more
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Journal ArticleDOI
A Joint Hybrid Precoding/Combining Scheme Based on Equivalent Channel for Massive MIMO Systems
TL;DR: Based on the singular value decomposition (SVD) technique and the concept of equivalent channel, joint hybrid precoding strategies with high spectral-efficiency and low complexity are proposed for both single-user and multi-user massive MIMO systems.
Journal ArticleDOI
A Joint Hybrid Precoding/Combining Scheme Based on Equivalent Channel for Massive MIMO Systems
TL;DR: In this article , a joint hybrid precoding/combinar design for both single-user and multi-user massive MIMO systems is proposed based on the singular value decomposition (SVD) technique and the concept of equivalent channel.
Journal ArticleDOI
Hybrid Beamforming and Data Stream Allocation Algorithms for Power Minimization in Multi-User Massive MIMO-OFDM Systems
TL;DR: In this paper , a hybrid beamforming structure is proposed to reduce implementation costs and energy consumption in millimeter-wave massive MIMO systems, which can dynamically adjust the number of data streams for each user according to the channel state information.
Journal ArticleDOI
Two-level-enforced security with hybrid precoding for multicast massive MIMO wiretap systems
TL;DR: In this paper , a fractional problem aimed at maximizing sum secrecy rate is proposed to optimize secure hybrid precoding in multicast massive MIMO wiretap system, which equivalently transforms the original problem into two suboptimal problems to separately optimize the secure analog precoding and secure digital precoding.
References
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Journal ArticleDOI
Variable-phase-shift-based RF-baseband codesign for MIMO antenna selection
TL;DR: This work introduces a novel soft antenna selection approach for multiple antenna systems through a joint design of both RF (radio frequency) and baseband signal processing that requires only simple, variable phase shifters and combiners to reduce the number of RF chains.
Journal ArticleDOI
Low-Complexity Hybrid Precoding in Massive Multiuser MIMO Systems
Le Liang,Wei Xu,Xiaodai Dong +2 more
TL;DR: The proposed hybrid precoding scheme, named phased-ZF (PZF), essentially applies phase-only control at the RF domain and then performs a low-dimensional baseband ZF precoding based on the effective channel seen from baseband.
Journal ArticleDOI
Phase Only RF Precoding for Massive MIMO Systems With Limited RF Chains
An Liu,Vincent K. N. Lau +1 more
TL;DR: A two-stage precoding scheme to efficiently exploit the large spatial degree of freedom (DoF) gain in massive MIMO systems with limited RF chains and reduced channel state information (CSI) signaling overhead and a low complexity solution based on a novel bi-convex approximation approach is proposed.
Journal ArticleDOI
Near-Optimal Hybrid Processing for Massive MIMO Systems via Matrix Decomposition
TL;DR: This work proposes to design hybrid RF and baseband precoders/combiners for multistream transmission in massive MIMO systems, by directly decomposing the predesigned unconstrained digital precoder/combiner of a large dimension by matrix decomposition.
Journal ArticleDOI
Channel Estimation and Hybrid Precoding for Frequency Selective Multiuser mmWave MIMO Systems
Jose P. Gonzalez-Coma,Javier Rodriguez-Fernandez,Nuria Gonzalez-Prelcic,Luis Castedo,Robert W. Heath +4 more
TL;DR: A system that uses compressive estimation on the uplink to configure precoders and combiners for the downlink in a millimeter wave multiuser multiple-input multiple-output system is developed.
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