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    Suppressing alignment: An approach for out-of-band interference reduction in OFDM systems
    (Institute of Electrical and Electronics Engineers, 2015) Tom, Anas; Şahin, Alphan; Arslan, Hüseyin
    In this work, we introduce a novel approach, called suppressing alignment, to reduce the out-of-band (OOB) interference of orthogonal frequency division multiplexing (OFDM) systems. Suppressing alignment exploits the unavoidable redundancy provided by the cyclic prefix (CP) and the wireless communications channel to generate an OOB interference suppressing signal at the OFDM transmitter. However, after passing through the wireless channel, the suppressing signal is aligned with the CP duration at the OFDM receiver, essentially causing no interference to the data portion of the OFDM symbol. The proposed approach reduces the OOB interference by tens of decibels and does not require any change in the receiver structure of legacy OFDM.
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    Suppressing alignment: Joint PAPR and out-of-band power leakage reduction for OFDM-based systems
    (Ieee-Inst Electrical Electronics Engineers Inc, 2016) Tom, Anas; Şahin, Alphan; Arslan, Hüseyin
    Orthogonal frequency division multiplexing (OFDM) inherently suffers from two major drawbacks: high out-of-band (OOB) power leakage and high peak-to-average power ratio (PAPR). This paper proposes a novel approach called suppressing alignment for the joint reduction of the OOB power leakage and PAPR. The proposed approach exploits the temporal degrees of freedom provided by the cyclic prefix (CP), a necessary redundancy in OFDM systems, to generate a suppressing signal, that when added to the OFDM symbol, results in marked reduction in both the OOB power leakage and PAPR. Additionally, and in order to not cause any interference to the information data carried by the OFDM symbol, the proposed approach utilizes the wireless channel to perfectly align the suppressing signal with the CP duration at the OFDM receiver. Essentially, maintaining a bit error rate (BER) performance similar to legacy OFDM without requiring any change in the receiver structure.