DFT-Based Hybrid Beamforming Multiuser Systems: Rate Analysis and Beam Selection

Abstract

This paper considers the discrete Fourier transform (DFT) based hybrid beamforming multiuser system and studies the use of analog beam selection schemes. We first analyze the uplink ergodic achievable rates of the zero-forcing (ZF) receiver and the maximum-ratio combining (MRC) receiver under Ricean fading conditions. We then examine the downlink ergodic achievable rates for the ZF and maximum-ratio transmitting (MRT) precoders. The long-term and short-term normalization methods are introduced, which utilize long-term and instantaneous channel state information (CSI) to implement the downlink power normalization, respectively. Also, approximations and asymptotic expressions of both the uplink and downlink rates are obtained, which facilitate the analog beam selection solutions to maximize the achievable rates. An exhaustive search provides the optimal results but to reduce the time-consumption, we resort to the derived rate limits and propose the second selection scheme based on the projected power of the line-of-sight (LoS) paths. We then combine the advantages of the two schemes and propose a two-step scheme that achieves near optimal performances with much less time-consumption than exhaustive search. Numerical results confirm the analytical results of the ergodic achievable rate and reveal the effectiveness of the proposed two-step method.

References in corpus (12)

• Massive MIMO for Next Generation Wireless Systems
• Spatially Sparse Precoding in Millimeter Wave MIMO Systems
• Channel Estimation and Hybrid Precoding for Millimeter Wave Cellular Systems
• Hybrid Digital and Analog Beamforming Design for Large-Scale Antenna Arrays
• Limited Feedback Hybrid Precoding for Multi-User Millimeter Wave Systems
• Low-Complexity Hybrid Precoding in Massive Multiuser MIMO Systems
• Power Scaling of Uplink Massive MIMO Systems with Arbitrary-Rank Channel Means
• Uplink Achievable Rate for Massive MIMO with Low-Resolution ADC
• On the Number of RF Chains and Phase Shifters, and Scheduling Design with Hybrid Analog-Digital Beamforming
• On the Spectral Efficiency of Massive MIMO Systems with Low-Resolution ADCs
• Ergodic Capacity Analysis of Amplify-and-Forward MIMO Dual-Hop Systems
• Performance Analysis of Massive MIMO for Cell-Boundary Users

Cited by in corpus (3)

• Hybrid Beamforming Design and Performance with Imperfect Phase Shifters in Multiuser Millimeter Wave Systems
• FDD Massive MIMO Based on Efficient Downlink Channel Reconstruction
• Dynamic Hybrid Precoding Relying on Twin-Resolution Phase Shifters in Millimeter-Wave Communication Systems