Study on MMSE Interpolation Schemes Using Multiple Symbols

This paper presents the idea of interpolating between multiple sounding bursts to estimate the individual channels of a MIMO scenario. The performance of the proposed technique depends on the fdT product and the number of transmit and receive antennas. In particular, this technique can be effective if the fdT product is not too high and the number of antennas is not too large. Furthermore, there is a considerable difference in the performance of the 16 channels in the 4x4 MIMO case because the sounding bursts spread farther apart with time, meaning that the Doppler in the channel causes a greater error for the channels. 요 약 본 연구에서는 MIMO 환경 하에서 모든 개별 채널을 추정하기 위해 다수의 사운딩 버스트 사이의 보간 기법을 이용한 아이디어를 제시한다. 제안된 기법의 성능은 fdT 값과 송수신단의 안테나 개수에 크게 의존하고 있으며 특히 본 연구를 통하여 제안된 기법은 fdT 값이 아주 크지 않거나 또는 안테나의 개수가 많지 않을 때 효과적임을 보인다. 또한 우리는 추정 채널의 개수와 안테나의 개수가 클 때는 사운딩 버스트들이 시간상에서 더 멀리 퍼져 있기 때문에 채널의 도플러 현상이 채널에 더 많은 오류를 유발할 수밖에 없으며 이로 인해 최상과 최악의 채널 추정 성능 차이가 더욱 커짐 을 보인다.

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