Abstract
This paper presents a method of implementing a 4 × 4 correlation matrix for evaluating the uplink channel properties of multiple-input multiple-output (MIMO) antennas using an over-the-air measurement system. First, the implementation model used to determine the correlation coefficients between the signals received at the base station (BS) antennas via the uplink channel is described. Then, a methodology is introduced to achieve a 4 × 4 correlation matrix for a BS MIMO antenna based on Jakes’ model by setting the initial phases of the secondary wave sources in the two-dimensional channel model. The performance of the uplink channel for a four-element MIMO terminal array antenna is evaluated using a two-dimensional bidirectional fading emulator. The results show that the measured correlation coefficients between the signals received via the uplink channel at the BS antennas using the proposed method are in good agreement with the BS correlation characteristics calculated using Monte Carlo simulation and the theoretical formula, thereby confirming the effectiveness of the proposed method.
Highlights
Fifth-generation (5G) mobile communication systems, which will enable high speed, low latency, and large capacity, are becoming commercially available globally
The results show that the measured correlation coefficients between the signals received via the uplink channel at the base station (BS) antennas using the proposed method are in good agreement with the BS correlation characteristics calculated using Monte Carlo simulation and the theoretical formula, thereby confirming the effectiveness of the proposed method
OTA measurement methods have been standardized by 3rd Generation Partnership Project (3GPP) and the Cellular Telecommunication and Internet Association (CTIA) [7,8]
Summary
Fifth-generation (5G) mobile communication systems, which will enable high speed, low latency, and large capacity, are becoming commercially available globally. To transmit high-capacity data, such as video data from a mobile terminal to a base station (BS), ultra-high-speed communication is required for the uplink channel. Evaluating the performance of MIMO terminals is necessary, for the downlink channels, and for the uplink channels. A straightforward method for evaluating a MIMO terminal is field testing in an actual scenario [6]. Over-the-air (OTA) testing, which evaluates the performance of MIMO mobile terminals by creating a realistic propagation environment in the laboratory, is very important. OTA measurement methods have been standardized by 3GPP and the Cellular Telecommunication and Internet Association (CTIA) [7,8]. The characteristics of the three OTA measurement methods are summarized as follows
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call