Analog Eigen-Beamforming for mmWave Systems: Performance under practical constraints
Résumé
Many millimeter wave systems embed phased array antennas to overcome the large path loss that is experienced at such high frequencies. Digital Fourier Transform based beamforming (DFT-BF) is often implemented as a low-complexity and very limited feedback technique. Although DFT-BF is optimal in pure Line-of-Sight scenarios, it is substantially outperformed in richer scattering environments by more advanced approaches such as Eigenvector-based beamforming (Eigen-BF). The latter is harder to implement in practical scenarios due to its computational complexity and amount of feedback. In this paper, we propose several solutions to alleviate those drawbacks and analyze various performance-complexity trade-offs in the perspective of a practical usage of Eigen-BF solutions.