Abstract
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.
Highlights
One of the most straightforward approaches for improving the capacity of multiple-input multiple-output (MIMO) systems is to use a large number of antenna elements
We have devised effective means of cMonicrsotmruacchtiinnesg2a02l0a, r1g1,e8-7s1cale MIMO array antenna, with distinct features that cannot be achieved u4soinf 2g5 previous technologies commonly aimed at enhancing the channel capacity at a base station; the objective of our project is accomplished by the emergence of a new technology named “Daisy Chain MMciacIrtMoemgOaochrAiinzneestd2e0ni2nn0,at1h”1.e, xfamily in Figure 2A, this paper focuses on a detailed description of the desig4nofa2n5d performance of a daisy chain 32 × 32 MIMO antenna
This paper presents a 32 × 32 MIMO antenna system with the ability to perform full-azimuth beam steering
Summary
One of the most straightforward approaches for improving the capacity of multiple-input multiple-output (MIMO) systems is to use a large number of antenna elements. The concept of large-scale MIMO or massive MIMO systems with more than 100 antenna elements has been proposed for both fifth and sixth generation (5G and 6G) mobile communications [1,2]. A large-scale MIMO antenna used for massive MIMO systems is capable of communicating with mobile stations in the hemispherical spatial region perpendicular to the surface of the patch array.
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