Constant-Amplitude Sequences for Spectrally Compact OFDM Training Waveforms
Constant-Amplitude Sequences for Spectrally Compact OFDM Training Waveforms
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DOI：
10.1109/tvt.2020.3017524
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发表时间：
2020-08
影响因子：
6.8
通讯作者：
Char-Dir Chung;Wei-Chang Chen;Chih-Kai Yang
中科院分区：
文献类型：
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作者：
Char-Dir Chung;Wei-Chang Chen;Chih-Kai Yang
在正交频分复用（OFDM）系统中，为了实现精确的信道估计和鲁棒的初始时频同步，需要使用恒幅（CA）序列来构造训练波形。然而，广泛采用的CA伪随机噪声和Zadoff-Chu序列遭受大的功率谱旁瓣，从而在OFDM训练波形中呈现低的谱紧凑性。这引起了新的CA序列的设计，以提供紧凑的频谱。在本文中，新的CA序列的长度$N$的显式序列表达式的所有复合序列的长度和所有素数序列的长度大于11的所有参数条件下，并提供更高的谱紧性比现有的CA序列。
Constant-amplitude (CA) sequences are desirable to construct training waveforms in orthogonal frequency division multiplexing (OFDM) systems in order to achieve accurate channel estimation and robust initial time and frequency synchronization. However, widely adopted CA pseudorandom-noise and Zadoff-Chu sequences suffer from large power spectral sidelobes and thus render low spectral compactness in OFDM training waveforms. This arouses the design of new CA sequences to provide compact spectrum. In this paper, new CA sequences of length $N$ are developed in explicit sequence expressions for all composite sequence lengths and all prime sequence lengths larger than 11 under all parametric conditions, and shown to provide higher spectral compactness than existing CA sequences.