Abstract
This study proposes a subspace-based inter-carrier interference (ICI) cancellation scheme for orthogonal-frequency-division-multiplexing (OFDM) systems. Conventional ICI cancellation methods suffer from the loss of spectral efficiency, and cannot handle the ICI incurred by a large frequency error. To improve the spectral efficiency, the proposed approach uses a subspace-based precoder that maps at most L−1 data symbols to a group of L consecutive subcarriers. At the receiver, the proposed approach first coarsely estimate the frequency bias through a set of nulling filters each defined on a dedicated spectral bin. Then, based on the estimate of the frequency bias, the proposed approach uses subcarrier-combiners to eliminate intra-group interference. Computer simulations show that in addition to achieving a high spectral efficiency proportional to the precoder order, the proposed approach can effectively eliminate the ICI caused by a large-frequency-error.
Original language | English |
---|---|
Pages (from-to) | 2881-2897 |
Number of pages | 17 |
Journal | Journal of the Franklin Institute |
Volume | 353 |
Issue number | 13 |
DOIs | |
State | Published - 01 09 2016 |
Bibliographical note
Publisher Copyright:© 2016 The Franklin Institute