전자공학회논문지 (Journal of the Institute of Electronics and Information Engineers)

  • 제52권1호
  • /
  • Pages.24-31
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  • 2015
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  • 2287-5026(pISSN)
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  • 2288-159X(eISSN)
대한전자공학회 (The Institute of Electronics and Information Engineers)
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MIMO 시스템에서 M-PSK 성운을 이용한 새로운 차분 동 이득 전송 기술

A Novel Differential Equal Gain Transmission Technique using M-PSK Constellations in MIMO System

  • 김영주 (충북대학교 정보통신공학과) ;
  • 서창원 (충북대학교 정보통신공학과) ;
  • 박노윤 (충북대학교 정보통신공학과)
  • Kim, Young-Ju (School of Information and Communication Engineering, Chungbuk National University) ;
  • Seo, Chang-Won (School of Information and Communication Engineering, Chungbuk National University) ;
  • Park, Noeyoon (School of Information and Communication Engineering, Chungbuk National University)
  • 투고 : 2014.11.11
  • 심사 : 2014.12.26
  • 발행 : 2015.01.25
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초록

코드워드의 인자로 M진 위상 편이 방식(M-ary phase shift keying, M-PSK)를 사용하는 차분 코드북은 Long term Evolution (LTE), LTE-Advanced (LTE-A) 그리고 WiMax 시스템 등에 제안된다. 인접하는 무선 채널의 시간 상관 특성에 의해 연속된 선부호화 행렬 내 양자화된 채널 정보는 천천히 변화된다. 이는 전체 무선 채널 공간을 양자화 하지 않고, 시간 상관 특성에 따른 채널 공간 내 일부분만을 양자화하여 피드백하기 때문에 기존과 동일한 크기의 코드북을 구성해도 가상적으로 보다 정확한 채널정보를 양자화할 수 있어 채널 용량이 증가하는 효과를 갖는다. 제안하는 코드북은 constant modulus, complexity reduction, 그리고 nested property와 같은 LTE release-8 코드북 특성을 갖는다. 또한 동 이즉 전송 특성을 갖기 때문에 상대적으로 저렴한 비선형 증폭기를 사용할 수 있어 가격의 제한을 받는 단말기 설계에도 이점을 갖는다. 컴퓨터 시뮬레이션을 통해 제안하는 차분 동 이득 전송 기술은 동일한 피드백 비트 수를 갖는 기존의 LTE-8 코드북보다 향상된 성능을 보인다.

A differential codebook using M-ary phase shift keying (M-PSK) constellation as its codeword elements, is proposed for Long term evolution (LTE), LTE-Advanced (LTE-A), and/or WiMAX systems. Due to the temporal correlation of the adjacent channel, the consecutive precoding matrices are likely to be similar. This approach quantize only the differential information of the channel instead of the whole channel subspace, which virtually increase the codebook size to realize more accurate quantization of the channel. Especially, the proposed codebook has the same properties of LTE release-8 codebook that is, constant modulus, complexity reduction, and nested property. The mobile station can be designed by using a less expensive non-linear amplifier utilizing the constant modulus property. Computer simulations show that the capacity of the proposed codebook performs better than LTE release-8 codebook with the same amount of feedback information.

키워드

참고문헌

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