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Spectrum notch forming and performance improvement scheme for windowed OFDM

This paper discusses the windowed OFDM systems to reduce out-of-band emissions band and make a deeper spectrum notch for spectrum sharing. However, the communication performance of the windowed OFDM is degraded. In this paper, the performance improvement scheme for the windowed OFDM is proposed. The guard interval signal is extended pre and post of the effective symbol to prevent warping by the window function. The bit error rate performance and reduction level in the spectrum notch are evaluated to show the effectiveness of the proposed scheme. Moreover, the shape of the window function to obtain better performance is examined.