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Low PAPR FBMC
Na D., Choi K. IEEE Transactions on Wireless Communications17 (1):182-193,2018.Type:Article
Date Reviewed: Sep 25 2018

Peak to average power ratio (PAPR) is an issue in signaling schemes that has gotten more complicated in multicarrier systems. High PAPR not only increases the out-of-band (OOB) radiation, but also requires a digital-to-analog converter (DAC) and a high-power amplifier (HPA) with large dynamic ranges to avoid amplitude clipping. This issue also exists for filter bank multicarrier (FBMC), which potentially can affect OOB spectrum suppression. This paper is a sample of efforts to promote FBMC and stabilize its significant properties. Therein, by analogy and theoretical work, effective single-carrier discrete Fourier transform (DFT) features are interwoven with an identically-time-shifted-multicarrier (ITSM) condition for FBMC to increase PAPR reduction.

To mitigate the PAPR, two previously developed techniques are considered: deploying the offset quadrature amplitude modulation (OQAM) in orthogonal frequency division multiplexing (OFDM) signaling, and using DFT spreading for FBMC. By applying the ITSM condition on “the phase shift terms for each subcarrier’s IQ channels,” the authors try to reduce side information (SI) dependency and complexity overhead.

To theorize their ideas, both pictorially and with related math formulas, the authors provide a review of FBMC and DFT spreading principles. Failure to fully exploit single-carrier DFT spreading has been counted as the main drawback of the previous proposal’s use of FBMC. To address this issue, the authors show how DFT-spread FBMC can offer some PAPR reduction. This reduction can be increased by setting the phase shift terms. Next, they provide a comparative discussion of PAPR “among the various FBMCs according to the phase shift pattern with/without DFT spreading.” According to the variety of factors in PAPR reduction by the proposed ITSM condition, different versions can be obtained. The next section of the paper, based on the “structure and algorithm of the proposed DFT-spread FBMC transmitter and receiver” and the complexity efficient transmitter, discusses how to choose the most performant version with the smallest peak power. Finally, the paper presents a performance comparison of PAPR reduction schemes for FBMC, with different parameters like number of subcarriers and different modulation policies.

The paper provides a comprehensive scientific discussion of its proposal. It definitely includes robust scientific theory and significant references.

Reviewer:  Mohammad Sadegh Kayhani Pirdehi Review #: CR146250 (1812-0637)
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