Prototype filter design for QAM-based filter bank multicarrier system

详细信息    查看全文

• 作者：Donghyun Jeon ^{jdh3577@yonsei.ac.kr" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Seonghyun Kim ^{sh-kim@yonsei.ac.kr" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Beom Kwon ^{hsm260@yonsei.ac.kr" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Hojae Lee ^{hojae84@yonsei.ac.kr" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Sanghoon Lee ; ^{slee@yonsei.ac.kr" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Filter bank multicarrier (FBMC) system ; Prototype filter ; Quadrature amplitude modulation (QAM) ; Generalized Nyquist criterion (GNC) ; Stopband
• 刊名：Digital Signal Processing
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：57
• 期：Complete
• 页码：66-78
• 全文大小：1092 K

文摘

In this paper, we provide conditions for a prototype filter design of filter bank multicarrier (FBMC) based on quadrature amplitude modulation (QAM). The conditions consist of a generalized Nyquist criterion (GNC) for nearly perfect reconstruction (NPR) and meeting the stopband condition for a small side-lobe. In a practical environment, a small side-lobe is a key aspect of achieving high spectral efficiency, which becomes an important factor in reducing the size of the guard band among channels. In addition, because the conventional GNC is derived under the assumption of an ideal channel, which can be easily broken over a practical multipath channel, we propose a relaxed NPR that considers the multipath delay using a 2L-oversampled discrete Fourier transform (DFT) in the frequency domain. Based on the relaxation of the GNC depending on a multipath channel, we formulate an optimization problem for a QAM-FBMC prototype filter design and propose a prototype filter with a small side-lobe and reliable BER performance. Simulation results show that the proposed prototype filter remarkably reduces the side-lobe compared to conventional QAM-FBMC based on two types of prototype filters and orthogonal frequency division multiplexing (OFDM) via the trade-off between GNC and side-lobe performance. The benefit of the side-lobe condition allows the proposed prototype filter, the Relaxed-NPR-F, to improve spectral efficiency by reducing the guard band in the frequency domain.