NDLI: Carrier Frequency-Offset Estimation for CFDM Systems Using Null Subcarriers

Content Provider	IEEE Xplore Digital Library
Copyright Year	1972
Description	Carrier Frequency-Offset Estimation for CFDM Systems Using Null Subcarriers Carrier frequency offset (CFO) in orthogonal frequency-division multiplexing (OFDM) systems induces the loss of orthogonality among subcarriers and results in significant performance degradation. Such offset is therefore a critical issue, and will need to be estimated and compensated for. In this paper, a suboptimal scheme is proposed to estimate the CFO using null subcarriers. In the proposed scheme, the CFO is divided into the fractional part and the integer part, with the fractional CFO estimation followed by the integer CFO estimation. Compared with previous work using null subcarriers and exhaustive search, the implementation complexity of the proposed scheme is significantly lower, due to the fact that the main component required is a simple correlator. Furthermore, with only one training OFDM symbol and proper null subcarrier allocation, the estimation range of the proposed scheme can be the inverse of the sampling duration. In contrast, conventional schemes with the same estimation range and complexity require two OFDM symbols. To achieve good performance, it will be shown that the null subcarrier allocation should be based upon some specific binary sequences, such as the proposed extended m-sequences. It will also be shown by simulations that the same null subcarrier-allocation criterion should be employed for optimal maximum-likelihood CFO estimation.
Starting Page	2167
Ending Page	2167
Page Count	1
File Size	35943
File Format	PDF
ISSN	00906778
Volume Number	53
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency estimation OFDM Frequency division multiplexing Performance loss Degradation Correlators Sampling methods Binary sequences Maximum likelihood estimation Information technology
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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