The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Detection Techniques for High Dimensional Spatial Multiplexing MIMO System

다차원 공간다중화 MIMO 시스템의 복조 기법

  • Received : 2014.05.30
  • Accepted : 2014.07.09
  • Published : 2014.07.31
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Abstract

With the increasing demands on high data rate, there has been growing interests in multi-input multi-output (MIMO) technology based on spatial multiplexing (SM) since it can transmit independent information in each spatial stream. Recent standards such as 3GPP LTE-advanced and IEEE 802.11ac support up to eight spatial streams, and massive MIMO and mm-wave systems that are expected to be included in beyond 4G systems are considering employment of tens to hundreds of antennas. Since the complexity of the optimum maximum likelihood based detection method increases exponentially with the number of antennas, low-complexity SM MIMO detection becomes more critical as the number of antenna increases. In this paper, we first review the results on the detection schemes for SM MIMO systems. In addition, massive MIMO reception schemes based on simple linear filtering which does not require exponential increment of complexity will be explained, followed by brief description on receiver design for future high dimensional SM MIMO systems.

전송 데이터 용량의 요구치가 급속히 증가하면서 공간 스트림마다 독립된 정보를 전송할 수 있는 spatial multiplexing (SM) 기반 multi-input multi-output (MIMO) 기술에 대한 관심이 증대되고 있다. 3GPP LTE-advanced, IEEE 802.11ac 등의 최근 표준들에서는 최대 8개까지의 공간 스트림을 지원하고 있으며, beyond 4G 시스템의 핵심 기술로 고려되고 있는 massive MIMO나 mm-wave 시스템에서는 수십~수백개 이상의 안테나 까지도 지원을 고려하고 있다. SM MIMO 시스템의 최적 복조 기법인 maximum likelihood (ML) 방식의 연산복잡도는 안테나수에 지수적으로 증가하므로, 안테나 수의 급속한 증가는 연산량의 급격한 증가를 유발하게 되어 낮은 복잡도로 구현 가능한 수신 기법들에 대한 필요성을 증대시키게 되었다. 본 논문에서는 이러한 SM MIMO 복조 기법들에 대한 연구 결과들을 설명한다. 또한, 기존의 복조 기법들과 달리, 지수적으로 복잡도의 증가가 필요하지 않는 간단한 선형 기법에 기반한 massive MIMO 시스템용 수신 기법에 대해서도 설명하고 향후의 시스템 디자인 시 고려할 사항들에 대해 간략히 정리한다.

Keywords

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