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Journal Article
Reduction of Doppler Effects in OFDM Systems
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- Authors
- Kap Seok Chang, Keun Young Kim, Dong Hoi Kim
- Issue Date
- 2006-11
- Citation
- IEEE Transactions on Consumer Electronics, v.52, no.4, pp.1159-1166
- ISSN
- 0098-3063
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- This paper observes the inter-carrier interference (ICI) by Doppler effect in time domain in orthogonal frequency division multiplexing systems. This observation allows us to propose a new time domain twostage equalization scheme that iteratively cancels the ICI. The proposed scheme consists of the following two stages: First, we apply low-complexity linear minimum mean squared error (MMSE) employing partial rank of time impulse response matrix to shorten the ICI components into diagonal region. Second, we propose new parallel interference cancellation with hard decision feedback to remove the residual ICI. Performance evaluations and complexity analyses show that the bit error rate and the signal-to-interference-plus-noise ratio performances of the proposed scheme are very close to those of the classical frequency domain linear MMSE equalization scheme with much reduced complexity. © 2006 IEEE.
- KSP Keywords
- Bit Error Rate(And BER), Complexity analyses, Decision feedback, Intercarrier interference(ICI), Linear minimum mean squared error, MMSE equalization, Minimum Mean Square Error(MMSE), OFDM systems, Orthogonal frequency division Multiplexing(OFDM), Performance evaluation, Reduced complexity