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CFO estimation schemes for differential OFDM systems
- Source :
- ICC
- Publication Year :
- 2009
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2009.
-
Abstract
- This paper proposes two blind carrier frequency offset (CFO) estimation schemes for differentially modulated orthogonal frequency division multiplexing (OFDM) systems. The proposed schemes estimate the fractional part of the CFO with only two consecutive OFDM blocks, and they exploit two implicit properties associated with differentially modulated OFDM (DOFDM) systems, i.e., the channel keeps constant over two consecutive OFDM blocks, and the DOFDM systems employ an M-ary phase-shift keying constellation. One of the schemes is based on the finite alphabet (FA) constraint and the other one is based on the constant modulus (CM) constraint. They provide a trade-off between the performance and computational complexity. Furthermore, the FA based scheme can achieve better performance at high signal-to-noise ratios at the expense of some additional computational complexity as compared to the existing CM based subspace scheme. The constrained Cramer-Rao lower bound is also derived. Several numerical examples are presented to validate the efficacy of the proposed schemes.
- Subjects :
- Computational complexity theory
Computer science
Orthogonal frequency-division multiplexing
Applied Mathematics
Keying
Upper and lower bounds
Computer Science Applications
Signal-to-noise ratio
Control theory
Carrier frequency offset
Electrical and Electronic Engineering
Frequency modulation
Algorithm
Computer Science::Information Theory
Mathematics
Communication channel
Phase-shift keying
Subjects
Details
- ISSN :
- 15361276
- Volume :
- 8
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Wireless Communications
- Accession number :
- edsair.doi.dedup.....121b986b6172c90b720f7561f22894c1