Unique word-orthogonal frequency division multiplexing (UW-OFDM) is known to provide various performance benefits over conventional OFDM using cyclic prefixes (CP). Most important, UW-OFDM features excellent spectral sidelobe suppression properties and an outstanding bit error ratio performance. Current research has mainly focused on principle performance bounds of UW-OFDM, with less attention on challenges aside from idealized communication scenarios, such as system parameter estimation tasks. In this work we present an approach for including frequency pilot tones into the UW-OFDM signaling scheme, which can then be utilized for these estimation tasks. Suitable optimization criteria are presented and interactions of pilots with data symbols are highlighted. Pilot tone based estimation of a carrier frequency offset (CFO) is conducted as an estimation example, revealing considerable differences to conventional OFDM. Simulation results in a multipath environment demonstrate a significantly increased estimation accuracy in UW-OFDM over CP-OFDM, which becomes even more dominant with an increasing CFO. This performance difference is due to the inherent redundancy present in an UW-OFDM signal.

中文翻译：

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单字OFDM中导频的包含与利用

众所周知，独特的字正交频分复用 (UW-OFDM) 可提供优于使用循环前缀 (CP) 的传统 OFDM 的各种性能优势。最重要的是，UW-OFDM 具有出色的频谱旁瓣抑制特性和出色的误码率性能。目前的研究主要集中在 UW-OFDM 的原理性能界限上，较少关注理想化通信场景之外的挑战，例如系统参数估计任务。在这项工作中，我们提出了一种将频率导频音包含到 UW-OFDM 信令方案中的方法，然后可以将其用于这些估计任务。提出了合适的优化标准，并强调了导频与数据符号的交互。基于导频音的载波频率偏移 (CFO) 估计作为估计示例进行，揭示了与传统 OFDM 的显着差异。多径环境中的仿真结果表明，UW-OFDM 比 CP-OFDM 的估计精度显着提高，随着 CFO 的增加，CP-OFDM 变得更加重要。这种性能差异是由于 UW-OFDM 信号中存在固有的冗余。