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Performance of a frequency-domain OFDM-frame detector

机译：频域OFDM帧检测器的性能

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摘要

A frequency-domain algorithm for orthogonal frequency-division multiplexing (OFDM)-frame detection is considered useful when the OFDM system is to operate in a known narrowband interference (NBI) channel, e.g., in a cognitive radio OFDM-based overlay system. While frame detection algorithm based on state-of-the-art time-domain correlation perform poorly in such a channel, we propose a frame detection algorithm based on energy detection in frequency domain. By exploiting the NBI band information obtained during sensing period, the proposed algorithm exhibits strong performance and outperforms other existing frequency-domain OFDM frame detection alternatives even at the signal-to-interference ratio (SIR) below 0 dB. Moreover, simulation results are confirmed by the analytical performance presented as a linear combination of the incomplete gamma function. The weight of each component is a function of the eigenvalues of the matrix associated with the detection metric and the number of summation is proportional to the number of non-zero eigenvalues of the matrix associated with the detection metric.
机译：当OFDM系统要在已知的窄带干扰（NBI）信道中（例如，在基于认知无线电OFDM的覆盖系统中）工作时，用于正交频分复用（OFDM）帧检测的频域算法被认为是有用的。虽然基于最新时域相关性的帧检测算法在这种信道中表现不佳，但我们提出了一种基于频域能量检测的帧检测算法。通过利用在感测期间获得的NBI频带信息，即使在信噪比（SIR）低于0 dB时，该算法仍具有强大的性能，并且优于其他现有的频域OFDM帧检测替代方案。此外，仿真结果通过不完全伽马函数的线性组合表示的分析性能得到了证实。每个分量的权重是与检测度量相关联的矩阵的特征值的函数，总和的数量与与检测度量相关联的矩阵的非零特征值的数量成比例。

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