Carrier frequency offset estimation algorithm for OFDM-based multi-cell systems

Ying Che Hung, Sheng Yuan Peng, Shang-Ho Tsai

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

In this paper, we propose an algorithm for estimating the carrier frequency offset (CFO) in OFDM-based multi-cell networks. In 3GPP-LTE single-cell systems, the CFO can be estimated by applying the Schmidl algorithm. However, multi-cell interference (MCI) is induced in multi-cell environments; as a result the MCI degrades estimate accuracy. One solution to mitigate MCI may be via properly designing the training sequences. In this paper, we propose a method for generating training sequences with good orthogonality in both time and frequency domain. Therefore, MCI can be effectively suppressed and CFO estimation algorithms designed for single-user or single-cell environments can be slightly modified, and applied in multi-cell environments. An example is given for showing how to modify the estimation algorithms. Consequently, the computational complexity can be dramatically reduced. Moreover, the training sequences can be applied for detecting cell identity (ID) thanks to its good orthogonality. Simulation results show that the proposed sequences and the CFO estimation algorithms outperform conventional schemes in multi-cell environments.

Original languageEnglish
Title of host publication2014 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9786163618238
DOIs
StatePublished - 12 Feb 2014
Event2014 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014 - Chiang Mai, Thailand
Duration: 9 Dec 201412 Dec 2014

Publication series

Name2014 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014

Conference

Conference2014 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2014
CountryThailand
CityChiang Mai
Period9/12/1412/12/14

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