Robust and Low Complexity Hybrid Beamforming for Uplink Multiuser MmWave MIMO Systems

Li, Jiahui; Xiao, Limin; Xu, Xiaodong; Zhou, Shidong

doi:10.1109/lcomm.2016.2542161

Cited by 118 publications

(70 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this section, we present numerical simulation results to evaluate the performance of the proposed schemes. We compare the proposed schemes with the Gram-Schmidt-based algorithm in [25] for FVPS, the improved quasi-coherent combining algorithm in [19] for FCPS, and the MMSE receiver proposed in [27] for FD schemes. In the simulation results, we consider an environment with N p = 15 propagation paths between each single-antenna user and the BS [9], uniformly distributed random AoAs within [0, 2π], and d = λ 2 , unless otherwise stated.…”

Section: Simulation Resultsmentioning

confidence: 99%

Hybrid Combining Based on Constant Phase Shifters and Active/Inactive Switches

Bahingayi

Lee

2020

IEEE Trans. Veh. Technol.

View full text Add to dashboard Cite

In this paper, we propose a new hybrid analog and digital combining architecture for millimeter wave (mmWave) multi-user multiple-input multiple-output (MU-MIMO) systems. The proposed structure employs antenna subset selection per radio frequency (RF) chain based on active/inactive switches and uses constant phase shifters (CPS) to control the phases of signals in the RF circuit. In this scheme, for each RF chain, a subset of receive antennas that contribute more to the desired signal power than the interference power is chosen for signal combining in the analog domain, whereas other receive antennas are excluded from signal combining, thereby enhancing sum-rates. Simultaneously, the proposed structure reduces power consumption in the RF circuit by exclusively activating switches that correspond to the antennas selected for each RF chain. We also develop three low-complexity algorithms for per-RF chain antenna subset selection. Finally, through numerical simulation, we show that the proposed structure provides higher spectral efficiency and higher energy efficiency than conventional hybrid analog and digital combining schemes for mmWave MU-MIMO systems.

show abstract

Section: Simulation Resultsmentioning

confidence: 99%

Hybrid Combining Based on Constant Phase Shifters and Active/Inactive Switches

Bahingayi

Lee

2020

IEEE Trans. Veh. Technol.

View full text Add to dashboard Cite

show abstract

“…Then, the vector g ( ) , , is selected from dictionary A rx . Therefore, optimization problem (20) can be approximated as follows: …”

Section: Design Of Subconnected Hybrid Iterative Multiuser Equalizermentioning

confidence: 99%

“…In [19], codebook design approaches were addressed for single-stream transmissions through an analog beamforming structure. For multiuser systems, some beamforming approaches have been proposed for fully connected hybrid architectures [20][21][22]. The authors of [20] proposed uplink receiving beamforming where they assume only single antenna user-terminals (UTs), and at both stages analog and digital ones dealt with multiuser interference.…”

Section: Introductionmentioning

confidence: 99%

“…For multiuser systems, some beamforming approaches have been proposed for fully connected hybrid architectures [20][21][22]. The authors of [20] proposed uplink receiving beamforming where they assume only single antenna user-terminals (UTs), and at both stages analog and digital ones dealt with multiuser interference. Reference [21] proposed for the downlink a limited feedback analog/digital two-stage precoding and combining algorithm.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Iterative Multiuser Equalization for Subconnected Hybrid mmWave Massive MIMO Architecture

Magueta

Mendes

Castanheira

et al. 2017

Wireless Communications and Mobile Computing

View full text Add to dashboard Cite

Millimeter waves and massive MIMO are a promising combination to achieve the multi-Gb/s required by future 5G wireless systems. However, fully digital architectures are not feasible due to hardware limitations, which means that there is a need to design signal processing techniques for hybrid analog-digital architectures. In this manuscript, we propose a hybrid iterative block multiuser equalizer for subconnected millimeter wave massive MIMO systems. The low complexity user-terminals employ pureanalog random precoders, each with a single RF chain. For the base station, a subconnected hybrid analog-digital equalizer is designed to remove multiuser interference. The hybrid equalizer is optimized using the average bit-error-rate as a metric. Due to the coupling between the RF chains in the optimization problem, the computation of the optimal solutions is too complex. To address this problem, we compute the analog part of the equalizer sequentially over the RF chains using a dictionary built from the array response vectors. The proposed subconnected hybrid iterative multiuser equalizer is compared with a recently proposed fully connected approach. The results show that the performance of the proposed scheme is close to the fully connected hybrid approach counterpart after just a few iterations.

show abstract

“…Moreover, the impact of the transmit and receive beam widths to the system performance was not studied. Uplink inter-user interference in mmWave systems was considered in [9]. The proposed scheme takes into consideration a single-cell scenario and assumes that the channel state information (CSI) is known perfectly at the AP.…”

Section: Introductionmentioning

confidence: 99%

Power and Beam Optimization for Uplink Millimeter-Wave Hotspot Communication Systems

Ismayilov

Holfeld

Cavalcante

et al. 2019

2019 IEEE Wireless Communications and Networking Conference (WCNC)

View full text Add to dashboard Cite

We propose an effective interference management and beamforming mechanism for uplink communication systems that yields fair allocation of rates. In particular, we consider a hotspot area of a millimeter-wave (mmWave) access network consisting of multiple user equipment (UE) in the uplink and multiple access points (APs) with directional antennas and adjustable beam widths and directions (beam configurations). This network suffers tremendously from multi-beam multi-user interference, and, to improve the uplink transmission performance, we propose a centralized scheme that optimizes the power, the beam width, the beam direction of the APs, and the UE -AP assignments. This problem involves both continuous and discrete variables, and it has the following structure. If we fix all discrete variables, except for those related to the UE-AP assignment, the resulting optimization problem can be solved optimally. This property enables us to propose a heuristic based on simulated annealing (SA) to address the intractable joint optimization problem with all discrete variables. In more detail, for a fixed configuration of beams, we formulate a weighted rate allocation problem where each user gets the same portion of its maximum achievable rate that it would have under non-interfered conditions. We solve this problem with an iterative fixed point algorithm that optimizes the power of UEs and the UE -AP assignment in the uplink. This fixed point algorithm is combined with SA to improve the beam configurations. Theoretical and numerical results show that the proposed method improves both the UE rates in the lower percentiles and the overall fairness in the network.

show abstract

Robust and Low Complexity Hybrid Beamforming for Uplink Multiuser MmWave MIMO Systems

Cited by 118 publications

References 11 publications

Hybrid Combining Based on Constant Phase Shifters and Active/Inactive Switches

Hybrid Combining Based on Constant Phase Shifters and Active/Inactive Switches

Iterative Multiuser Equalization for Subconnected Hybrid mmWave Massive MIMO Architecture

Power and Beam Optimization for Uplink Millimeter-Wave Hotspot Communication Systems

Contact Info

Product

Resources

About