Out-of-band emission reduction and a unified framework for precoded OFDM

Xiaojing Huang, Jian A. Zhang, Y. Jay Guo

Research output: Contribution to journalArticle

23 Citations (Scopus)


OFDM has been regarded as a promising candidate for use in cognitive radio systems with dynamic spectrum reuse capability. However, conventional OFDM has significant OOBE, which can cause severe interference to systems operating in adjacent frequency bands. In addition to conventional techniques such as spectral shaping filtering, guard band insertion, and time domain windowing, new OOBE reduction techniques, including cancellation carrier and spectral precoding, have been proposed in recent years. This article reviews various OOBE reduction techniques and proposes a generalized lowcomplexity OOBE reduction framework for discrete Fourier transform precoded OFDM. With the allocation of explicit frequency domain cancellation subcarriers and data domain cancellation symbols, the proposed framework enables various configurations to achieve significant OOBE reduction with low implementation complexity, and provides flexibility in balancing OOBE reduction and other performance metrics such as peak-to-average power ratio.

Original languageEnglish
Article number7120032
Pages (from-to)151-159
Number of pages9
JournalIEEE Communications Magazine
Issue number6
Publication statusPublished - 1 Jun 2015
Externally publishedYes

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