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

The Institute of Electronics and Information Engineers (대한전자공학회)
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A Study on Partial Correlation based PSS Detection Schemes for Initial Cell Search in LTE Systems

LTE 시스템에서 초기 셀 탐색을 위한 부분 상관값 기반 PSS 검출 방식에 관한 고찰

  • Joo, Jung Suk (Department of Electronics Engineering, Hankuk University of Foreign Studies)
  • 주정석 (한국외국어대학교 전자공학과)
  • Received : 2014.04.05
  • Accepted : 2014.08.29
  • Published : 2014.09.25
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Abstract

The synchronization signal in Long Term Evolution (LTE) systems contains the primary synchronization signal (PSS) and the secondary synchronization signal (SSS), and the overall synchronization performance is dominated by PSS detection. In this paper, we propose a PSS detection scheme employing three partial correlation based PSS detectors with different partial correlation lengths, in which calculated partial correlation values are reused in order to reduce computational complexity. A coherent selection scheme using tentative frequency offsets is also proposed to select one reliable result from outputs of partial correlation based PSS detectors. It is shown through computer simulation that the proposed scheme can have a robust detection performance in wide range of frequency offsets.

LTE 시스템의 하향링크 동기 신호는 PSS (primary synchronization signal)과 SSS (secondary synchronization signal)로 나눠져 있으며, 미리 정해져 있는 3 개의 신호 중 하나가 전송되는 PSS 신호를 먼저 찾은 다음 SSS 신호를 검출하게 된다. 본 논문에서는 부분 상관값 계산 구간의 길이가 다른 검출기들을 동시에 사용하는 PSS 검출 방식을 제안한다. 우선 구간별 부분 상관값을 다시 활용함으로써 여러 개의 검출기를 동시에 사용함에 따른 계산량의 증가를 최소화한다. 또한, 동시에 사용된 검출기들의 결과 값 중에서 가장 믿을 만한 하나의 값을 선택하기 위하여 임시 주파수 오차 값(tentative frequency offset)을 이용한 동기식 최종 추정치 선택 방법을 제안한다. 컴퓨터 모의실험을 통하여, 제안된 방식이 넓은 주파수 오차 범위에서 안정적인 PSS 검출 성능을 보임을 검증하고자 한다.

Keywords

References

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