In this paper, we study the time-variance of a roadside infrastructure to infrastructure (I2I) channel operating at 60 GHz millimetre wave (mmWave) band, where the time-variance is caused by moving vehicles acting as scatterers. At first, measurement data is obtained by placing the transmitter (TX) and the receiver (RX) at different heights to emulate a link between two nonidentical roadside units (RSUs), and time-domain channel sounding is performed by sending complementary Golay sequences from the TX to the RX. A linear piece-wise interpolation of the corresponding temporal auto-correlation function (ACF) is used to find the Doppler spread of the I2I channel, where our interpolation method compensates for a slower sampling rate. Next, a framework is presented for time-variant channel impulse response (CIR) simulation which focuses on moving scatterers only and validates the linear piece-wise ACF model. The framework is useful for time-variant vehicular I2I channel simulation and in speed estimation related vehicular applications. Finally, a double-slope curve-fitted analytical model for ACF is proposed as a generalisation to the linear piece-wise model. The proposed model and its Doppler spectrum are found to be in agreement with the analytical results for fixed-to-fixed (F2F) channels with moving scatterers and matches perfectly with the measured data.

在本文中，我们研究了在60 GHz毫米波（mmWave）频段上工作的路边基础设施到基础设施（I2I）信道的时变，其中时变是由充当散射器的移动车辆引起的。首先，通过将发射器（TX）和接收器（RX）放置在不同的高度，以模拟两个不同路边单元（RSU）之间的链接，获得测量数据，并通过从TX到RX。对应的时间自相关函数（ACF）的线性分段插值用于查找I2I通道的多普勒扩展，其中我们的插值方法可补偿较慢的采样率。下一个，提出了用于时变信道脉冲响应（CIR）模拟的框架，该框架仅关注移动散射体，并验证了线性分段ACF模型。该框架可用于时变车载I2I通道仿真以及与速度估算相关的车载应用。最后，提出了双斜率曲线拟合的ACF分析模型，作为对线性分段模型的推广。发现所提出的模型及其多普勒频谱与具有移动散射体的固定到固定（F2F）通道的分析结果一致，并且与测量数据完美匹配。提出了一种双斜率曲线拟合的ACF分析模型，作为对线性分段模型的推广。发现所提出的模型及其多普勒频谱与具有移动散射体的固定到固定（F2F）通道的分析结果一致，并且与测量数据完美匹配。提出了一种双斜率曲线拟合的ACF分析模型，作为对线性分段模型的推广。发现所提出的模型及其多普勒频谱与具有移动散射体的固定到固定（F2F）通道的分析结果一致，并且与测量数据完美匹配。