Summary
International Symposium on Antennas and Propagation
2012
Session Number:POS2
Session:
Number:POS2-25
Considerations on a Frequency Correlation for Distributed Antenna Systems
Kanako Yamaguchi, Yasutaka Ogawa, Toshihiko Nishimura, Takeo Ohgane,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
Radio technology has been developed extensively for mobile communications and wireless LANs. In a wireless communication channel, we have multipath propagation due to reflections and scatterings. When the delay difference between multipath waves is large, we have frequency selective fading. Thus far, a frequency correlation defined for a single antenna has been used for evaluating the frequency selectivity. Multiple antennas have been introduced to realize space diversity and/or spatial multiplexing. The conventional frequency correlation cannot be used for multiple-antenna systems. Thus far, we have proposed a frequency correlation for a centralized multiple-antenna system, and compared it with the conventional frequency correlation defined for a single antenna. It has been clarified that when the antenna spacing is large, the proposed frequency correlation is different from the conventional one depending on the arrival angles. In this paper, we analyze the proposed frequency correlation for distributed antenna systems which have a large antenna spacing. Moreover, we introduce a degradation coefficient of signal detection to evaluate the effect of the frequency selectivity, and compare it with the frequency correlation in an exponential delay profile case. It has been clarified that the frequency correlation for the 2 Remote Antenna Unit case varies depending on the Mobile Terminal position. On the other hand, in the case of 7 Remote Antenna Units, it has been shown that all the frequency correlations almost coincide with each other. Moreover, it has been shown that the frequency correlation and the degradation coefficient of the signal detection show almost the same behavior. Therefore, we can evaluate the degradation of the signal detection using the proposed frequency correlation.