Dynamic Subarrays for Hybrid Precoding in Wideband mmWave MIMO Systems

By Sungwoo Park, Ahmed Alkhateeb, Robert W. Heath. IEEE Transactions on Wireless Communications, 2016

418 citations recorded by the source corpus.

Hybrid analog/digital precoding architectures can address the tradeoff between achievable spectral efficiency and power consumption in large-scale MIMO systems. This makes them a promising candidate for millimeter wave systems, which deploy large antenna arrays at both the transmitter and the receiver to guarantee sufficient received signal power. Most prior work on hybrid precoding focused on narrowband channels and assumed fully connected hybrid architectures. Millimeter wave (mmWave) systems, though, are expected to be wideband with frequency selectivity. In this paper, a closed-form solution for fully connected OFDM-based hybrid analog/digital precoding is developed for frequency selective mmWave systems. This solution is then extended to partially connected but fixed architectures in which each RF chain is connected to a specific subset of the antennas. The derived solutions give insights into how the hybrid subarray structures should be designed. Based on this, a novel technique that dynamically constructs the hybrid subarrays knowing the long-term channel characteristics is developed. Simulation results show that the proposed hybrid precoding solutions achieve spectral efficiencies close to that obtained with fully digital architectures in wideband mmWave channels. Furthermore, the results indicate that the developed dynamic subarray solution outperforms the fixed hybrid subarray structures in various system and channel conditions.

Subfields: Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/a00ec2972751f9462738174afeba4318f771184e

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In Electrical and Electronic Engineering

Citations in the corpus

A Comprehensive Survey on Millimeter Wave Communications for Fifth-Generation Wireless Networks: Feasibility and Challenges (2020, methodology): “Conventional MIMO precoding techniques require a dedicated radio frequency (RF) chain for each antenna element, which becomes impractical to realize with massive MIMO systems in mmWave bands, due to high hardware cost and high power consumption [2], [6], [28]–[30].”
Non-Stationarities in Extra-Large-Scale Massive MIMO (2019, background): “Recently, dynamic hybrid architectures are also considered that adapt to the channel, hence providing flexible yet simpler implementation [13].”
Hybrid Analog and Digital Beamforming for mmWave OFDM Large-Scale Antenna Arrays (2017, methodology): “In order to compare the performance of the proposed scheme with the algorithm in [20], this experiment considers a 64 × 8 MIMO system with K = 64 subcarriers in which a transmitter with 8 RF chains sends N s = 8 data symbols per subcarrier to a receiver equipped with 8 RF chains so that the…”
5G: A Tutorial Overview of Standards, Trials, Challenges, Deployment, and Practice (2017, background): “Many variations of sub-array design are possible, including both static and dynamic sub-array selection [18] and panel structures, but the motivation is the same: simpliﬁed circuitry and reduced RF losses.”
An Overview of Signal Processing Techniques for Terahertz Communications (2020, background): “dynamic AoSA (DAoSA) architecture to tune the connections between SAs and RF chains [213]–[216].”
A Survey on Hybrid Beamforming Techniques in 5G: Architecture and System Model Perspectives (2018, methodology): “connected (in which each RF chain is connected to all transmit antennas) and partially connected (in which each RF chain is connected to a specific subset of the antennas) OFDM massive MIMO systems are derived in [103].”