This paper presents a multiple-input, multiple-output (MIMO) antenna system with the ability to perform full-azimuth beam steering, and with the aim of realizing greater than 20 Gbps vehicular communications. The MIMO antenna described in this paper comprises 64 elements arranged in a daisy chain array structure, where 32 subarrays are formed by pairing elements in each subarray; the antenna yields 32 independent subchannels for MIMO transmission, and covers all communication targets regardless of their position relative to the array. Analytical results reveal that the proposed antenna system can provide a channel capacity of more than 200 bits/s/Hz at a signal-to-noise power ratio (SNR) of 30 dB over the whole azimuth, which is equivalent to 20 Gbps for a bandwidth of 100 MHz. This remarkably high channel capacity is shown to be due to two significant factors; the improved directivity created by the optimum in-phase excitation and the low correlation between the subarrays due to the orthogonal alignment of the array with respect to the incident waves. Over-the-air (OTA) experiments confirm the increase in channel capacity; the proposed antenna can maintain a constant transmission rate over all azimuth angles.

中文翻译：

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以菊花链阵列结构布置的全方位角波束控制MIMO天线。

本文提出了一种多输入多输出（MIMO）天线系统，该系统具有执行全方位波束控制的能力，并且旨在实现大于20 Gbps的车辆通信。本文描述的MIMO天线包括以菊花链阵列结构排列的64个元件，其中32个子阵列由每个子阵列中的元件配对形成；天线产生32个独立的子信道用于MIMO传输，并且覆盖所有通信目标，无论它们相对于阵列的位置如何。分析结果表明，所提出的天线系统可以在整个方位角上以30 dB的信噪功率比（SNR）提供超过200 bit / s / Hz的信道容量，这相当于20 Gbps。 100 MHz的带宽。事实证明，这种高通道容量是由两个重要因素引起的；由于阵列相对于入射波的正交排列，最佳的同相激励和子阵列之间的低相关性产生了改进的方向性。空中（OTA）实验证实了信道容量的增加；建议的天线可以在所有方位角上保持恒定的传输速率。