An Analog Module for Hybrid Massive MIMO Testbeds Demonstrating Beam Alignment Algorithms

Konferenz: WSA 2018 - 22nd International ITG Workshop on Smart Antennas
14.03.2018 - 16.03.2018 in Bochum, Deutschland

Tagungsband: WSA 2018

Seiten: 8Sprache: EnglischTyp: PDF

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Autoren:
Kuehne, Thomas; Caire, Giuseppe (Communications and Information Theory Chair, Technische Universität Berlin, Germany)

Inhalt:
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.