Detection of PRACH Sequence for 5G New Radio with Physical Layer Split 


Vol. 45,  No. 9, pp. 1517-1526, Sep.  2020
10.7840/kics.2020.45.9.1517


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  Abstract

This paper proposes a detection method for the physical random access channel (PRACH) when the physical layer split is employed in the base station for 5G mobile communication. Physical layer functions are divided into the low physical layer (PHY) located in the remote unit with transmit and receive antennas and the high PHY located in the base station. The lower PHY extracts the PRACH signals from receive signals and sends the PRACH samples after compression to the high PHY. The high PHY performs PRACH sequence detection using the PRACH signals received from the lower PHY. For the sequence detection, the frequency offset is estimated and corrected using the repeated patterns of the time-domain PRACH signal. Also, the high PHY computes the cross-correlation between the receive signal and the random access sequence considering a time offset between the base station and user equipments, and detects a random access sequence based on the peak-to-average ratio obtained from the cross-correlation values. Through link-level simulations under the 5G performance test conditions, we show that the proposed PRACH detection method achieves at least 5.8 dB margin in terms of the signal-to-noise ratio compared to the PRACH performance test specifications.

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  Cite this article

[IEEE Style]

K. Kim, Y. Yoon, N. Kwon, H. Kim, J. Choi, "Detection of PRACH Sequence for 5G New Radio with Physical Layer Split," The Journal of Korean Institute of Communications and Information Sciences, vol. 45, no. 9, pp. 1517-1526, 2020. DOI: 10.7840/kics.2020.45.9.1517.

[ACM Style]

Kibeom Kim, Yeowon Yoon, Nagwon Kwon, Hyeonchae Kim, and Jihoon Choi. 2020. Detection of PRACH Sequence for 5G New Radio with Physical Layer Split. The Journal of Korean Institute of Communications and Information Sciences, 45, 9, (2020), 1517-1526. DOI: 10.7840/kics.2020.45.9.1517.

[KICS Style]

Kibeom Kim, Yeowon Yoon, Nagwon Kwon, Hyeonchae Kim, Jihoon Choi, "Detection of PRACH Sequence for 5G New Radio with Physical Layer Split," The Journal of Korean Institute of Communications and Information Sciences, vol. 45, no. 9, pp. 1517-1526, 9. 2020. (https://doi.org/10.7840/kics.2020.45.9.1517)

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pISSN : 1226 - 4717
eISSN : 2287 - 3880