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Spectrally precoded orthogonal frequency-division multiplexing (SP-OFDM) and SP-OFDM multiple access (SP-OFDMA) are bandwidth-efficient rectangularly pulsed multicarrier signaling formats that can provide power spectral sidelobes decaying asymptotically as $f^{- 2L - 2}$, with $L$ being a preassigned positive-integer design parameter, which results in a compact spectrum. The existing spectral precoders...
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