An Analog Module for Hybrid Massive MIMO Testbeds Demonstrating Beam Alignment Algorithms
Conference: WSA 2018 - 22nd International ITG Workshop on Smart Antennas
03/14/2018 - 03/16/2018 at Bochum, Deutschland
Proceedings: ITG-Fb. 276: WSA 2018
Pages: 8Language: englishTyp: PDFPersonal VDE Members are entitled to a 10% discount on this title
Kuehne, Thomas; Caire, Giuseppe (Communications and Information Theory Chair, Technische Universität Berlin, Germany)
Hybrid analog-digital beamforming for massive MIMO is an important technology for millimeter-wave communication systems. Current experimentation of massive MIMO is based mainly on full digital solutions and in the sub-6 GHz frequency range. The technology for millimeter-wave massive MIMO systems is not yet available to the broad research community. Due to high path loss, sparsity of the channel, and restrictions of the hardware in the millimeter-wave band, new challenges in signal processing arise. One of these problems is the initial link acquisition also called beam alignment (BA). We present a hybrid analog-digital massive MIMO sub-6 GHz testbed with 64 antennas. This testbed enables the investigation of challenges connected to a hybrid analog-digital architecture like the BA problem. We demonstrate multiple BA algorithms to show their advantages and disadvantages. The testbed is based on a self-developed analog module with a high resolution of phase and amplitude settings. Our module can be connected to standard software defined radios (SDRs) and supports different types of hybrid architectures.