Long Term Evolution (LTE) is expected to substitute the Global System for Mobile Communications (GSM) as the radio access technology for railway communications. Recently, especial attention has been devoted to high-speed trains since this particular environment poses challenging problems in terms of performance simulation and measurement. In order to severely decrease the cost and complexity of high-speed measurement campaigns, we have proposed a technique to induce effects caused by highly-time varying channels on Orthogonal Frequency-Division Multiplexing (OFDM) signals while conducting measurements at low speeds. In this work, we employ this technique to evaluate LTE transmissions in a Time-Division Duplex (TDD) fashion, which is more convenient for the railway environment due to a number of reasons (e.g., better flexibility in frequency choice and the importance of the uplink transmissions for railway control communications). We assess the performance obtained in high-speed scenarios up to 500 km/h.
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机译：期望长期演进（LTE）将全球移动通信系统（GSM）替代为铁路通信的无线电接入技术。最近，由于这种特定环境在性能模拟和测量方面构成了挑战性问题，因此特别注意高速列车。为了严重降低高速测量运动的成本和复杂性，我们提出了一种在正交频分复用（OFDM）信号上的高度变化通道引起的效果，同时在低速下进行测量。在这项工作中，我们采用该技术来评估时分双工（TDD）时尚中的LTE传输，这是由于多种原因（例如，频率选择中的更好的灵活性以及频率选择的灵活性以及重要性）更方便用于铁路控制通信的上行链路传输）。我们评估高达500 km / h的高速场景中获得的性能。
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