Millimeter-Wave GaN Devices for 5G: Massive MIMO Antenna Arrays for Sub-6-Ghz and mm-Wave Bandwidth

Multiple Input Multiple Output (MIMO) and massive MIMO technologies play a significant role in mitigating five generation (5G) channel propagation impairments. These impairments increase as frequency increases, and they become worse at millimeter-waves (mmWaves). They include difficulties of material penetration, Line-of-Sight (LoS) inflexibility, small cell coverage, weather circumstances, etc. This paper simulates the 5G channel at the E-band frequency using the Monte Carlo approach-based NYUSIM tool. The urban microcell (UMi) is the communication environment of this simulation. Both MIMO and massive MIMO use uniformly spaced rectangular antenna arrays (URA). This study investigates the effects of MIMO and massive MIMO on LOS and Non-LOS (NLOS) environments. The simulations considered directional and omnidirectional antennas, the Power Delay Profile (PDP), Root Mean Square (RMS) delay spread, and small-scale PDP for both LOS and NLOS environments. As expected, the wide variety of the results showed that the massive MIMO antenna outperforms the MIMO antenna, especially in terms of the signal power received at the end-user and for longer path lengths.

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On the Power Leakage Problem in Millimeter-Wave Massive MIMO With Lens Antenna Arrays

IEEE Transactions on Signal Processing ◽

10.1109/tsp.2019.2926019 ◽

2019 ◽

Vol 67 (18) ◽

pp. 4730-4744 ◽

Cited By ~ 6

Author(s):

Tian Xie ◽

Linglong Dai ◽

Derrick Wing Kwan Ng ◽

Chan-Byoung Chae

Keyword(s):

Millimeter Wave ◽

Antenna Arrays ◽

Massive Mimo ◽

Lens Antenna ◽

Power Leakage

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OTA Testing for Massive MIMO Devices Using Cascaded APM Networks and Channel Emulators

International Journal of Antennas and Propagation ◽

10.1155/2019/6901383 ◽

2019 ◽

Vol 2019 ◽

pp. 1-14

Author(s):

Lijian Xin ◽

Yong Li ◽

Hao Sun ◽

Xiang Zhang

Keyword(s):

Antenna Arrays ◽

Massive Mimo ◽

Structural Model ◽

Radio Channel ◽

Multiple Input Multiple Output ◽

Angular Spectrum ◽

Anechoic Chamber ◽

Mimo Antenna ◽

Channel Emulator ◽

Input Multiple Output

This paper proposes an over-the-air (OTA) testing setup for millimeter-wave (mmWave) massive multiple-input multiple-output (MIMO) equipment using cascaded amplitude and phase modulation (APM) network and channel emulator. Compared with the existing test setup with mechanical switch, the proposed testing setup enables more accurate reconstruction of the radio channel environment under the multiprobe anechoic chamber (MPAC) setup without increasing the number of channel emulators (CEs) to control the system cost. The constructed MPAC testing setup for mmWave and massive MIMO equipment is composed of an anechoic chamber, a sectored probe wall containing a number of probes, an APM network, a fading channel emulator, and a user emulator (UE). In this paper, the structural model and the performance advantages of the proposed radiated testing setup are described, and a fully connected APM network for radiated testing is more prominent than the existing switch. Moreover, the angular spectrum is selected as the performance metric for the reconstructed channel. The ability of the proposed system to reconstruct the power angular spectrum (PAS) of the target channel is studied under both static and dynamic channel models, which can reflect the performance of beamforming procedures of the massive MIMO antenna arrays, e.g., beam acquisition, tracking, and refinement. The simulation results for angular spectrum support the superiority of the proposed OTA testing setup. Furthermore, the simulations for average channel capacity also show that radiated testing setup using cascaded APM network and channel emulator is valid.

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