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. The constrained Cramer-Rao lower bound is also derived. Several numerical examples are presented to validate the efficacy of the proposed schemes.
Original language | English |
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Article number | 4786492 |
Pages (from-to) | 124-129 |
Number of pages | 6 |
Journal | IEEE Transactions on Wireless Communications |
Volume | 8 |
Issue number | 1 |
DOIs | |
Publication status | Published - Jan 2009 |
Externally published | Yes |
Keywords
- Carrier frequency offset (CFO)
- Constant modulus (CM)
- Differential modulation
- Finite alphabet (FA)
- Orthogonal frequency division multiplexing (OFDM)