Accurate signal detection for BPSK-OFDM systems in time-varying channels

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• 作者：Min Huang^aAuthor Vitae ; Lei Huang^a ; ^{lhuang@szu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Weize Sun^aAuthor Vitae ; Jihong Zhang^aAuthor Vitae ; Hing Cheung So^bAuthor Vitae
• 关键词：Detection ; BPSK-OFDM ; MMSE ; Equalizer ; Time-varying channel
• 刊名：Digital Signal Processing
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：60
• 期：Complete
• 页码：370-379
• 全文大小：590 K

文摘

Binary phase shift keying (BPSK) orthogonal frequency division multiplexing (OFDM) has been adopted in the fourth-generation wireless communications. However, the real-valued property of BPSK-OFDM signals has not yet been utilized for channel equalization. In this work, this property is employed to develop a new equalizer based on the minimum mean square error (MMSE) criterion, leading to considerable enhancement in signal detection. In particular, the proposed equalizer is able to achieve 3 dB improvement over the existing MMSE equalizer in large signal-to-noise ratio region, and is more robust against channel estimation errors. Moreover, successive detection technique employed in the devised method is able to make use of diversity in time-varying channels, resulting in further performance enhancement. Additionally, the computational complexity of the proposed approach is analyzed. Simulation results are included to illustrate its performance superiority and computational attractiveness.