10.5281/zenodo.3337958
https://zenodo.org/records/3337958
oai:zenodo.org:3337958
Song, Xiaoshen
Xiaoshen
Song
TECHNISCHE UNIVERSITAT BERLIN
Kühne, Thomas
Thomas
Kühne
TECHNISCHE UNIVERSITAT BERLIN
Caire, Giuseppe
Giuseppe
Caire
TECHNISCHE UNIVERSITAT BERLIN
Fully-Connected vs. Sub-Connected Hybrid Precoding Architectures for mmWave MU-MIMO
Zenodo
2019
mmWave
MIMO
sub-connected
fully-connected
beam alignment
spectral efficiency
2019-05-22
eng
10.5281/zenodo.3337957
https://zenodo.org/communities/serena-h2020
https://zenodo.org/communities/eu
Creative Commons Attribution 4.0 International
Hybrid digital analog (HDA) beamforming has attracted considerable attention in practical implementation of millimeter wave (mmWave) multiuser multiple-input multiple-output (MU-MIMO) systems due to its low power consumption with respect to its digital baseband counterpart. The implementation cost, performance, and power efficiency of HDA beamforming depends on the level of connectivity and reconfigurability of the analog beamforming network. In this paper, we investigate the performance of two typical architectures for HDA MU-MIMO, i.e., the fully-connected (FC) architecture where each RF antenna port is connected to all antenna elements of the array; and the one-stream-per-subarray (OSPS) architecture where the RF antenna ports are connected to disjoint subarrays. We jointly consider the initial beam acquisition phase and data communication phase, such that the latter takes place by using the beam direction information obtained in the former phase. For each phase, we propose our own BA and precoding schemes that outperform the counterparts in the literature. We also evaluate the power efficiency of the two HDA architectures taking into account the practical hardware impairments, e.g., the power dissipation at different hardware components as well as the potential power backoff under typical power amplifier (PA) constraints. Numerical results show that the two architectures achieve similar sum spectral efficiency, but the OSPS architecture outperforms the FC case in terms of hardware complexity and power efficiency, only at the cost of a slightly longer time of initial beam acquisition.
European Commission
10.13039/501100000780
779305
gan-on-Silicon Efficient mm-wave euRopean systEm iNtegration plAtform