FBMC-OQAM is a promising multi-carrier technique being considered for future wireless communication systems, owing to the flexibility it provides via the choice of prototype filters, robustness against asynchronous transmissions, and the absence of cyclic-prefix requirement. The performance of FBMC-OQAM systems is however limited by the accuracy of channel estimation due to the presence of so-called intrinsic interference. In this letter, we consider two well-known preamble-based channel estimation approaches for FBMC-OQAM, and propose generic preamble structures, followed by formulation of mathematical optimization problems to improve the resilience of both estimation schemes against this intrinsic interference. The proposed preambles, without incurring any additional run-time complexity at transceiver, lead to improved noise suppression, eventually leading to superior channel estimation performance. The benefit of the proposed preambles is shown not only numerically in terms of the relevant performance metrics, but also via link-level simulations under realistic transmission scenarios.

中文翻译：

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在 FBMC-OQAM 信道估计中改进噪声抑制的前导码设计

FBMC-OQAM 是一种有前途的多载波技术，正在考虑用于未来的无线通信系统，因为它通过原型滤波器的选择提供了灵活性、对异步传输的鲁棒性以及没有循环前缀要求。然而，由于存在所谓的固有干扰，FBMC-OQAM 系统的性能受到信道估计精度的限制。在这封信中，我们考虑了 FBMC-OQAM 的两种众所周知的基于前导码的信道估计方法，并提出了通用前导码结构，然后制定了数学优化问题，以提高两种估计方案对这种固有干扰的弹性。提议的前导码不会在收发器处引起任何额外的运行时间复杂性，从而改善噪声抑制，最终导致卓越的信道估计性能。所提议的前导码的好处不仅在相关性能指标方面以数字方式显示，而且还通过实际传输场景下的链路级模拟显示出来。