이종 안테나 배열을 적용한 근거리 자기장 MIMO 시스템
Near-Field Magnetic Induction MIMO System Using Heterogeneous Antenna Arrays
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초록
본 논문은 이종 안테나 배열을 적용한 새로운 자기장 MIMO 시스템을 제안한다 . 근거리 자기장통신은 루프 안테나 사이의 자기유도결합을 기반으로 데이터를 주고 받는다 . MIMO 구현을 위해 동일한 루프 안테나를 배열했을 경우 송수신 사이의 거리보다 송신단 /수신단의 배열된 안테나 사이의 거리가 더 가까워 더 강한 결합이 만들어지고 배열된 안테나 사이의 누화 (crosstalk)가 발생할 수 있다 . 본 논문은 이종의 다중극자 (multi-pole) 안테나를 배열하여 배열된 안테나 간의 신호를 상쇄 , 결합을 최소화하는 안테나 배열을 제안하고 시뮬레이션과 실험을 통하여 검증하였다 . 또한 제안된 구조의 채널 용량 분석을 통해서 기존의 MIMO를 적용한 통신에서처럼 안테나 수의 증가 에 따른 선형적인 채널 용량의 증가가 가능함을 보였다 . 제안 기법은 병렬의 데이터 전송을 통한 채널 용량 증대 외에도 전력과 데이터 동시 병렬 전송 등 다양한 응용이 가능하다 .
Abstract
In this paper, we propose a novel Near-Field Magnetic Induction (NFMI) Multi-Input Multi-Output (MIMO) system. Conventional Single-Input Sing-Output (SISO) NFMI communication systems transfer data by inductive coupling between a transmitter and a receiver.When we arrange same type loop antennas to realize a MIMO system, however, crosstalk may occur among the array antenna components either in a transmitter or receiver side due to the inductive coupling, where the coupling is usually stronger than that between the transmitter and the receiver due to a short distance between the antenna array components either in the transmitter and receiver. To mitigate the performance degradation due to the crosstalk, we propose a heterogeneous multi-pole loop antenna array which can cancel the crosstalk without coupling, where the cancellation is verified by simulations and experiments. Furthermore, we confirm the channel capacity enhancement of the scheme can be used in various applications supporting simultaneous power and data transfer as well as high data rate communications.
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