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Data-Aided Doppler Compensation for High-Speed Railway Communications Over mmWave Bands | IEEE Journals & Magazine | IEEE Xplore

Data-Aided Doppler Compensation for High-Speed Railway Communications Over mmWave Bands


Abstract:

Millimeter wave communications show great potentials in many applications, one of which is the high-speed railway(HSR) communication system. However, a major challenge is...Show More

Abstract:

Millimeter wave communications show great potentials in many applications, one of which is the high-speed railway(HSR) communication system. However, a major challenge is the Doppler effect caused by the relative-movement between the train and the base station (BS), which leads to fast channel variation. To compensate for the Doppler shift, an accurate channel model is indispensable, and the far-field channel model is generally employed, which assumes that the dimensions of the antenna arrays are negligible compared to the distance between transmitter and receiver. This model is widely used in Cellular systems, but the underlining assumption is not always true for railway communication systems. In this paper, the modeling of the Doppler effect for millimeter wave in HSR communications is conducted, and data-aided Doppler estimation and compensation algorithms are designed based on the new model. We show that the conventional far-field channel model is based on the first-order Taylor expansion of the actually channel, and the second-order component cannot be ignored for HSR communications. Extensive simulations are conducted to verify the validity of the new model and the effectiveness of the proposed algorithms.
Published in: IEEE Transactions on Wireless Communications ( Volume: 20, Issue: 1, January 2021)
Page(s): 520 - 534
Date of Publication: 30 September 2020

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I. Introduction

Over the past decade, the future communication systems based on massive multiple-input-multiple-output (MIMO) [1] and millimeter wave [2] have been widely investigated. The available bandwidth at millimeter wave(mmWave) frequencies is hundreds of times larger than the conventional LTE(Long-Term Evolution) bands. The massive MIMO technique can improve the spectral efficiency by tens of times and compensate for the large propagation loss of mmWave signals. Meanwhile, the short wavelength of mmWave allows compact design of large antenna arrays. Therefore, the combination of massive MIMO and mmWave frequencies is attracting researchers from different areas in wireless communications, and the high-speed railway(HSR) communication is one of them.

References

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