Low-Complexity and Robust Quantized Hybrid Beamforming and Channel Estimation

Hybrid beamforming with phase shifters and switches has been identified as a low-cost and energy-efficient approach to harness the benefits of massive multiple-input multiple-output (MIMO) systems. In this paper, three subconnected hybrid beamforming structures with different combinations of phase shifters and switches will be considered. Firstly we assume that perfect channel state information (CSI) is available and the wireless channel follows uncorrelated Rayleigh fading model. Then, we derive the closed-form expressions of the low-complexity beamformers and their asymptotic achievable sum-rates. Based on the proposed beamformers, we develop quantized hybrid beamforming and channel estimation techniques for correlated Rayleigh fading channels. These methods rely on designing novel RF codebooks and they can be used in both CSI acquisition and data transmission phases. The proposed methods benefit from low computational complexity, low signaling overhead and robustness to estimation errors. Moreover, they are applicable to both frequency and time division duplex systems.

[1]  F. Tufvesson,et al.  Channel measurements and analysis for very large array systems at 2.6 GHz , 2012, 2012 6th European Conference on Antennas and Propagation (EUCAP).

[2]  Gianni Pasolini,et al.  Design Criteria for FIR-Based Echo Cancellers , 2016, IEEE Transactions on Broadcasting.

[3]  Christos Masouros,et al.  Hybrid Analog–Digital Precoding Revisited Under Realistic RF Modeling , 2016, IEEE Wireless Communications Letters.

[4]  Mehrdad Dianati,et al.  Hybrid Beamforming for Downlink Massive MIMO Systems with Multiantenna User Equipment , 2017, 2017 IEEE 86th Vehicular Technology Conference (VTC-Fall).

[5]  Fredrik Tufvesson,et al.  Delay spread properties in a measured massive MIMO system at 2.6 GHz , 2013, 2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC).

[6]  Mathini Sellathurai,et al.  Hybrid Beamforming With a Reduced Number of Phase Shifters for Massive MIMO Systems , 2017, IEEE Transactions on Vehicular Technology.

[7]  Robert W. Heath,et al.  Spatially Sparse Precoding in Millimeter Wave MIMO Systems , 2013, IEEE Transactions on Wireless Communications.

[8]  Giuseppe Caire,et al.  Joint Spatial Division and Multiplexing—The Large-Scale Array Regime , 2013, IEEE Transactions on Information Theory.

[9]  Symeon Chatzinotas,et al.  On the energy-efficiency of hybrid analog-digital transceivers for large antenna array systems , 2017, 2017 IEEE International Conference on Communications (ICC).

[10]  Bruno Clerckx,et al.  Rate splitting for MIMO wireless networks: a promising PHY-layer strategy for LTE evolution , 2016, IEEE Communications Magazine.

[11]  Robert W. Heath,et al.  Energy-Efficient Hybrid Analog and Digital Precoding for MmWave MIMO Systems With Large Antenna Arrays , 2015, IEEE Journal on Selected Areas in Communications.

[12]  Erik G. Larsson,et al.  Scaling Up MIMO: Opportunities and Challenges with Very Large Arrays , 2012, IEEE Signal Process. Mag..

[13]  Yu Zhang,et al.  On the Performance of Channel-Statistics-Based Codebook for Massive MIMO Channel Feedback , 2017, IEEE Transactions on Vehicular Technology.

[14]  A.F. Molisch,et al.  Variable-phase-shift-based RF-baseband codesign for MIMO antenna selection , 2005, IEEE Transactions on Signal Processing.

[15]  Robert W. Heath,et al.  Limited feedback diversity techniques for correlated channels , 2006, IEEE Transactions on Vehicular Technology.

[16]  Mathini Sellathurai,et al.  Phase Shifters Versus Switches: An Energy Efficiency Perspective on Hybrid Beamforming , 2019, IEEE Wireless Communications Letters.

[17]  Xiaodai Dong,et al.  Low-Complexity Hybrid Precoding in Massive Multiuser MIMO Systems , 2014, IEEE Wireless Communications Letters.

[18]  Mehrdad Dianati,et al.  Effective RF codebook design and channel estimation for millimeter wave communication systems , 2015, 2015 IEEE International Conference on Communication Workshop (ICCW).

[19]  Mehrdad Dianati,et al.  Hybrid Beamforming for Large Antenna Arrays With Phase Shifter Selection , 2016, IEEE Transactions on Wireless Communications.