MU-MIMO channel emulator with automatic channel sounding feedback for IEEE 802.11ac

The user traffic in the mobile communication area has rapidly increased owing to the widespread of smartphones and various cloud services. To handle the increasing traffic, in the fifth-generation mobile communication system (5G), the millimeter-wave multiple-input and multiple-output (MIMO) communication technology is under development. Because the MIMO transmission performance heavily depends on the radio propagation characteristics, various MIMO channel measurements are needed for the performance evaluation and system design. The accurate and efficient parameter estimation algorithm which estimates the propagation delays and angle of arrivals (AoA) of radio waves is also indispensable for the purpose. In this paper, we extended the joint delay and azimuth estimation (JADE) method based on multiple signal classification (MUSIC) algorithm. In our proposal, the drawback of the MUSIC that the performance degrades for the estimation of coherent waves was solved by applying the smoothing technique in the frequency domain. It also makes the antenna calibration simpler. We implemented the proposed algorithm for the channel sounding system in the 66 GHz band, which is one of the candidate frequency bands for the International Mobile Telecommunications (IMT) system and evaluated the effectiveness through the experiment in an anechoic chamber. The result showed that our proposed method can de-correlate the signal components of coherent waves, and improved the parameter estimation accuracy significantly. The root means square error (RMSE) of the propagation delay estimation was improved from 2.7 ns to 0.9 ns, and the RMSE of the AoA estimation was improved from 20.3 deg. to 7.2 deg. The results are expected to be utilized for the millimeter wave band MIMO channel modeling.

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Arbitary direction path generation for MIMO channel emulator

2013 IEEE Antennas and Propagation Society International Symposium (APSURSI) ◽

10.1109/aps.2013.6711790 ◽

2013 ◽

Author(s):

Yoshiaki Amano ◽

Masayuki Nakano ◽

Akira Yamaguchi

Keyword(s):

Mimo Channel ◽

Path Generation ◽

Channel Emulator

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Research on Improvement of the Next Generation IEEE802.11ac Channel Model

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.712-715.1741 ◽

2013 ◽

Vol 712-715 ◽

pp. 1741-1745

Author(s):

Hao Cai ◽

Dan Ao Han

Keyword(s):

Wireless Local Area Network ◽

Channel Model ◽

Local Area Network ◽

Local Area ◽

Task Group ◽

Mimo Channel ◽

Area Network ◽

Power Delay Profile ◽

Ieee 802.11Ac ◽

Set Up

Based on the special correlation of antennas and the power delay profile (PDP) of the cluster model, six models of A-F have been established by the TGn task-group in total. On the basis of the new broadband wireless local area network (WLAN) standard--IEEE 802.11ac with larger bandwidth and multi-user requirements drawn up by the TGac task-group, in this paper, the IEEE 802.11ac channel model is set up by means of improving and simulating the indoor MIMO channel.

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MIMO channel sounding taking into account small angular spread

The 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications ◽

10.1109/pimrc.2002.1046555 ◽

2003 ◽

Cited By ~ 2

Author(s):

T.R. Kurpjuhn ◽

W. Utschick

Keyword(s):

Angular Spread ◽

Mimo Channel ◽

Channel Sounding

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A Flexible FPGA-Based Channel Emulator for Non-Stationary MIMO Fading Channels

Applied Sciences ◽

10.3390/app10124161 ◽

2020 ◽

Vol 10 (12) ◽

pp. 4161

Author(s):

Qiuming Zhu ◽

Wei Huang ◽

Kai Mao ◽

Weizhi Zhong ◽

Boyu Hua ◽

...

Keyword(s):

Fading Channels ◽

Channel Model ◽

Multiple Input Multiple Output ◽

Mimo Channel ◽

Channel Fading ◽

Power Delay Profile ◽

Channel Emulator ◽

Field Programmable ◽

Fpga Chip ◽

Doppler Power

In this paper, a discrete non-stationary multiple-input multiple-output (MIMO) channel model suitable for the fixed-point realization on the field-programmable gate array (FPGA) hardware platform is proposed. On this basis, we develop a flexible hardware architecture with configurable channel parameters and implement it on a non-stationary MIMO channel emulator in a single FPGA chip. In addition, an improved non-stationary channel emulation method is employed to guarantee accurate channel fading and phase, and the schemes of other key modules are also illustrated and implemented in a single FPGA chip. Hardware tests demonstrate that the output statistical properties of proposed channel emulator, i.e., the probability density function (PDF), cross-correlation function (CCF), Doppler power spectrum density (DPSD), and the power delay profile (PDP) agree well with the corresponding theoretical ones.

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