OFDM系统副瓣抑制技术

I. Cosovic, S. Brandes, M. Schnell
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引用次数: 47

摘要

本文提出并研究了正交频分复用(OFDM)系统中抑制副瓣的新技术。该技术可应用于纯OFDM和基于OFDM的多址系统,以提高频谱效率。此外,它可以在基于OFDM的覆盖系统中使用,以避免对与覆盖系统在同一频带上运行的遗留系统的干扰。提出了一种基于副载波加权的副瓣抑制技术。确定实值子载波权重的方式是使用一种能够考虑多个优化约束的优化算法最小化传输信号的副瓣。结果表明,该方法能有效抑制副瓣,抑制幅度大于10 dB。这些结果是通过只允许适度的误码率性能损失来实现的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A technique for sidelobe suppression in OFDM systems
In this paper, a new technique for sidelobe suppression in orthogonal frequency-division multiplexing (OFDM) systems is proposed and investigated. This technique can be applied to both pure OFDM and OFDM based multiple-access systems to improve spectral efficiency. Moreover, it can be utilized within OFDM based overlay systems to avoid interference towards the legacy systems operating in the same frequency band as the overlay system. The proposed sidelobe suppression technique is based on subcarrier weighting. The real-valued subcarrier weights are determined in such a way that the sidelobes of the transmission signal are minimized using an optimization algorithm which is capable to take several optimization constraints into account. Results show that sidelobes can be easily suppressed by more than 10 dB with the proposed technique. These results are achieved by allowing only a moderate loss in bit-error rate performance.
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