Experimental Evaluation of Intersymbol Interference in Non-Far Region Transmission using a Large Array Antenna in the Millimeter-Wave Band

Tuchjuta RUCKKWAEN  Takashi TOMURA  Kiyomichi ARAKI  Jiro HIROKAWA  Makoto ANDO  

IEICE TRANSACTIONS on Communications   Vol.E103-B   No.10   pp.1136-1146
Publication Date: 2020/10/01
Publicized: 2020/04/02
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2019EBP3099
Type of Manuscript: PAPER
Category: Antennas and Propagation
intersymbol interference (ISI),  non-far region,  large array antenna,  signal to noise plus interference (SINR),  

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Intersymbol interference (ISI) is a significant source of degradation in many digital communication systems including our proposed non-far region communication system using large array antennas in the millimeter-wave band in which the main cause of ISI can be attributed to the path delay differences among the elements of an array antenna. This paper proposes a quantitative method to evaluate the ISI estimated from the measured near-field distribution of the array antenna. The influence of the uniformity in the aperture field distribution in ISI is discussed and compared with an ideally uniform excitation. The reliability of the proposed method is verified through a comparison with another method based on direct measurements of the transmission between the actual antennas. Finally, the signal to noise plus interference is evaluated based on the estimated ISI results and ISI is shown to be the dominant cause of the degradation in the reception zone of the system.