지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
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The Long Term Evolution (LTE) system is designed to provide a high quality data service for fast moving mobile users. It is based on the Orthogonal Frequency Division Multiplexing (OFDM) and relies its channel estimation on the training samples which are systematically built within the transmitting data. Either a preamble or a lattice type is used for the distribution of training samples and the latter suits better for the multipath fading channel environment whose channel frequency response (CFR) fluctuates rapidly with time. In the lattice-type structure, the estimation of the CFR makes use of the least squares estimate (LSE) for each pilot samples, followed by an interpolation both in timeand in frequency-domain to fill up the channel estimates for subcarriers corresponding to data samples. All interpolation schemes should rely on the pilot estimates only, and thus, their performances are bounded by the quality of pilot estimates. However, the additive noise give rise to high fluctuation on the pilot estimates, especially in a communication environment with low signal-to-noise ratio. These high fluctuations could be monitored in the alternating high values of the first forward differences (FFD) between pilot estimates. In this paper, we analyzed statistically those FFD values and propose a postprocessing algorithm to suppress high fluctuations in the noisy pilot estimates. The proposed method is based on a localized adaptive moving-average filtering. The performance of the proposed technique is verified on a multipath environment suggested on a 3GPP LTE specification. It is shown that the mean-squared error (MSE) between the actual CFR and pilot estimates could be reduced up to 68% from the noisy pilot estimates.
목차
Abstract
1. 서론
2. 시스템 모델
3. CFR-LSE의 통계적 분석
4. 국지적 MA 필터링 기법을 이용한 LSE 향상 기법
5. 결론
참고문헌
저자소개
참고문헌 (10)
참고문헌 신청
1. [단행본] - R. Becker / 2009 / LTE and the evolution to 4G wireless: Design and measurement challenges / Agilent Technologies Publication
2. [학술지(정기간행물)] - S. Kang / 2003 / A comparative investigation on channel estimation algorithms for OFDM in mobile communications / IEEE Trans. on Broadcasting 49 (2) : 142 ~ 149
3. [학술지(정기간행물)] - M. Morelli / 2001 / Comparison of pilot-aided channel estimation methods for OFDM systems / IEEE Trans. on Signal Proc 49 (12) : 3065 ~ 3073
4. [학술지(정기간행물)] - 박현철 / 200704 / Efficient DFT-based channel estimation for OFDM systems on multipath channels / IET COMMUNICATIONS 1 (2) : 197 ~ 202
5. [학술대회논문] - B. Yang / 2000 / Windowed DFT based pilot-symbol-aided channel estimation for OFDM systems in multipath fading channels / Vehicular Technology Conference Proceedings, 2000, VTC 2000-Spring : 1480 ~ 1484
2. [학술지(정기간행물)] - S. Kang / 2003 / A comparative investigation on channel estimation algorithms for OFDM in mobile communications / IEEE Trans. on Broadcasting 49 (2) : 142 ~ 149
3. [학술지(정기간행물)] - M. Morelli / 2001 / Comparison of pilot-aided channel estimation methods for OFDM systems / IEEE Trans. on Signal Proc 49 (12) : 3065 ~ 3073
4. [학술지(정기간행물)] - 박현철 / 200704 / Efficient DFT-based channel estimation for OFDM systems on multipath channels / IET COMMUNICATIONS 1 (2) : 197 ~ 202
5. [학술대회논문] - B. Yang / 2000 / Windowed DFT based pilot-symbol-aided channel estimation for OFDM systems in multipath fading channels / Vehicular Technology Conference Proceedings, 2000, VTC 2000-Spring : 1480 ~ 1484
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UCI(KEPA) : I410-ECN-0101-2012-560-003795640