Leakage-Based Robust Beamforming for Multi-Antenna Broadcast System with Per-Antenna Power Constraints and Quantized CDI

Abstract

In this paper, we investigate the robust beamforming schemes for a multi-user multiple-input-single-output (MU-MISO) system with per-antenna power constraints and quantized channel direction information (CDI) feedback. Our design objective is to maximize the expectation of the weighted sum-rate performance by means of controlling the interference leakage and properly allocating the power among user equipments (UEs).First, we prove the optimality of the non-robust zero-forcing (ZF) beamforming scheme in the sense of generating the minimum amount of average inter-UE interference under quantized CDI. Then we derive closed-form expressions of the cumulative density function (CDF) of the interference leakage power for the non-robust ZF beamforming scheme, based on which we adjust the leakage thresholds and propose two robust beamforming schemes under per-antenna power constraints with an iterative process to update the per-UE power allocations using the geometric programming (GP). Simulation results show the superiority of the proposed robust beamforming schemes compared with the existing schemes in terms of the average weighted sum-rate performance.

References in corpus (3)

• Robust Linear Precoder Design for Multi-cell Downlink Transmission
• Regularized Zero-Forcing for Multiantenna Broadcast Channels with User Selection
• Sequential and Incremental Precoder Design for Joint Transmission Network MIMO Systems with Imperfect Backhaul

Cited by in corpus (4)

• On the Performance of Practical Ultra-Dense Networks: The Major and Minor Factors
• Transmit Power Minimization in Small Cell Networks Under Time Average QoS Constraints
• What is the Optimal Network Deployment for a Fixed Density of Antennas?
• Complete Power Reallocation for MU-MIMO under Per-Antenna Power Constraint