Computational complexity reduction of orthogonal precoding for sidelobe suppression of OFDM signal
Computational complexity reduction of orthogonal precoding for sidelobe suppression of OFDM signal
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DOI：
10.1109/apcc.2015.7412556
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发表时间：
2015-10
期刊：
影响因子：
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通讯作者：
Hikaru Kawasaki;M. Ohta;K. Yamashita
中科院分区：
文献类型：
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作者：
Hikaru Kawasaki;M. Ohta;K. Yamashita
频谱雕刻 (SS) 是一种用于正交频分复用 (OFDM) 信号旁瓣抑制的预编码方案，可以在选定频率上塑造具有深陷波的频谱。然而，随着陷波频率数量的增加，SS 方法会降低错误率。 SS的正交预编码既具有陷波谱，又具有理想的误码率，但预编码矩阵的计算复杂度很大。本文提出了正交预编码的预编码矩阵的矩阵分解，以降低计算复杂度。数值实验表明，所提出的方法可以大大降低计算复杂度。
Spectrum sculpting (SS) is a precoding scheme for sidelobe suppression of orthogonal frequency division multiplexing (OFDM) signals and can shape a spectrum with deep notches at chosen frequencies. However, the SS method will degrade the error rate as the number of notched frequencies increases. Orthogonal precoding of the SS has both a notched spectrum and an ideal error rate, but the computational complexity of the precoder matrix is very large. This paper proposes a matrix decomposition of the precoder matrix of the orthogonal precoding to reduce the computational complexity. Numerical experiments show that the proposed method can drastically reduce the computational complexity.