Authors
Lianjie Wang, Xiaoping Hong, Jucheng Zhang, Hongyu Cui, Dianlun Zhang, Dajun Sun
Published in
The Journal of the Acoustical Society of America. Volume 160. Issue 3. Pages 2592-2607. Sep 01, 2026.
Abstract
The orthogonal frequency-division multiplexing multiple frequency-shift keying with sweep-spread carrier (OFDM-MFSK-S2C) suffers from inter-carrier interference (ICI), which is often misaligned with the orthogonal subcarrier grid (i.e., the nominal grid). To address this issue, a refined-grid intra-carrier interference mitigation (RG-ICIM) algorithm is proposed, which models non-orthogonal ICI components by subdividing the spacing of the nominal subcarrier grid. Based on the refined-grid model, Linear Frequency Modulation (LFM) preamble is utilized to estimate non-orthogonal ICI components. A mapping matrix is then constructed to link the refined-grid ICI representation to the nominal-grid transmit-symbol vector, based on which a least squares criterion is formulated to obtain the ICI mitigation-filter tapping coefficients. In addition, a simplified Cooley-Tukey Fast Fourier Transform algorithm is developed to reduce demodulation complexity. Simulation results demonstrate that the proposed algorithm mitigates ICI effectively and achieves a lower bit-error rate (BER) than conventional OFDM-MFSK in severe multipath channels. In the field test, OFDM-MFSK-S2C with the RG-ICIM achieves an average BER of 2×10-4, substantially outperforming conventional OFDM-MFSK (2.95×10-2) and nominal-grid ICI mitigation (1.69×10-2).
PMID:
42803627
Bibliographic data and abstract were imported from PubMed on 28 Sep 2026.
Read full publication at:
Please sign in
to see all details.
Advertisement
Stats
- Recommendations n/a n/a positive of 0 vote(s)
- Views 7
- Comments 0