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Pre-Equalized and Spectrally Precoded OFDM
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DOI：10.1109/TVT.2022.3167671.png)
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摘要
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When the channel state information is available, frequency-domain precoding is studied for rectangularly-pulsed orthogonal frequency-division multiplexing (OFDM) using cyclic prefix over dispersive channels to provide extremely compact signal spectrum, enhanced achievable data rate (ADR), and reduced peak-to-average power ratio (PAPR) jointly. With a precoding rate not larger than 1 - 2I/N, a general precoder form is first developed for the transmitted N-subcarrier OFDM signal to provide extremely small baseband power spectral sidelobes decaying asymptotically as f -2I-2 or faster, with f being the frequency, and thus achieve high spectrum compactness while yielding reduced PAPR. Incorporating the channel response, a particular spectral precoder following the general form is then designed to maximize the ADR under a fixed transmitted power. When a small out-of-band power proportion is required to guarantee spectrum compactness, the proposed pre-equalized and spectrally-precoded OFDM system can provide much higher ADR per unit bandwidth than pre-equalized OFDM, spectrally-precoded OFDM, and nonprecoded OFDM. When the low-complexity receiver ismandatory, a systematically pre-equalized and spectrally precoded OFDM system is also developed to achieve enhanced ADR, extremely high spectrum compactness, and low-complexity receiver operation by trading transmission power on cancellation subcarriers.
Keyword:
Orthogonal frequency-division multiplexing
sidelobe suppression
achievable data rate
channel pre-equalization
期刊
IF:
7.1
论文数:
1.8W
被引数:
6.6W
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引用论文
Modeling and Analysis on Radio Interference of OFDM Waveforms for Coexistence Study.png)
IEEE ACCESS
OAAI
IEEE ACCESSIF3.6
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