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Performance analysis of some timing offset equalizers for FBMC/OQAM systems

机译：FBMC / OQAM系统的一些定时偏移均衡器的性能分析

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摘要

The requirements of future wireless networks lead to reconsidering the physical layer and, particularly the respective merits of the major multicarrier transmission techniques, OFDM and FBMC. In comparison, equalization has been a sticking issue for filter bank multicarrier systems, because of performance and implementation aspects. In contrast, equalization is straightforward to implement in OFDM systems and it is easy to figure out the performance achieved, thanks to the presence of the cyclic prefix. Here, OFDM and FBMC/OQAM systems are compared for timing offset equalization, which is representative of global channel equalization and appears as such in some use cases, e.g. asynchronous access. The single tap equalizer and the multitap time-domain equalizer are analyzed for a specific, yet representative, FBMC scheme. It is shown that multitap time-domain timing-offset sub-channel equalization brings improvements over single-tap equalization but its discrete time nature limits its performance. There is no such limitation in the frequency domain and a recently proposed implementation of the FBMC concept, named frequency spreading, is analyzed. Equipped with this receiver, an FBMC system can withstand any timing offset and, then, unlike OFDM, it is able, in a multicarrier context to support asynchronous users while keeping spectral efficiency.
机译：未来无线网络的需求导致重新考虑物理层，尤其是主要的多载波传输技术OFDM和FBMC的各自优点。相比之下，由于性能和实现方面的原因，均衡对于滤波器组多载波系统一直是一个棘手的问题。相反，由于存在循环前缀，均衡在OFDM系统中很容易实现，并且很容易弄清楚实现的性能。此处，比较OFDM和FBMC / OQAM系统的定时偏移均衡，它表示全局信道均衡，并在某些使用情况下（例如，异步访问。针对特定的但具有代表性的FBMC方案分析了单抽头均衡器和多抽头时域均衡器。结果表明，多抽头时域定时偏移子信道均衡带来了优于单抽头均衡的改进，但其离散时间特性限制了其性能。在频域中没有这样的限制，并且分析了最近提出的FBMC概念的实现，即频率扩展。配备此接收器的FBMC系统可以承受任何定时偏移，然后，与OFDM不同，它可以在多载波环境中支持异步用户，同时保持频谱效率。

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  • 来源
    《Signal processing》 |2015年第3期|167-182|共16页
  • 作者

    Davide Mattera; Mario Tanda; Maurice Bellanger;

  • 作者单位

    Dipartimento di Ingegneria Elettrica e delle Tecnologie dell'Informazione, Universita degli Studi di Napoli Federico Ⅱ, via Claudio 21, I-80125 Napoli, Italy;

    Dipartimento di Ingegneria Elettrica e delle Tecnologie dell'Informazione, Universita degli Studi di Napoli Federico Ⅱ, via Claudio 21, I-80125 Napoli, Italy;

    CNAM-Electronique, 292 rue Saint-Martin, 75141 Paris cedex 03, France;

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  • 正文语种 eng
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  • 关键词

    OFDM/OQAM; Multicarrier systems; Timing offset equalization; FBMC; Asynchronous access;

    机译：OFDM / OQAM;多载波系统;定时偏移均衡;FBMC;异步访问;

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