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Blind Carrier Frequency Synchronization for the Uplink of Interleaved OFDMA Systems

机译:交错OFDMA系统上行链路的盲载波频率同步

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摘要

In this letter, a novel blind CFO estimation algorithm for the uplink of an OFDMA system is proposed. The proposed method exploits the inherent redundant information in OFDMA symbols and does not require additional pilot or preamble overhead. Since it is a post-FFT estimator, it does not use filter banks to separate the desired user's signal from the others in the time domain. Hence, the subcarriers of a certain user are not restricted to be clustered in the frequency domain. Therefore, the proposed estimator can be applied to OFDMA systems with an arbitrary subcarrier assignment over the entire bandwidth, including IEEE 802.16e, to obtain sufficient frequency diversity in a frequency selective fading channel. The proposed method can be efficiently used for continuous tracking of all active users' CFOs only with two FFT windows within a single OFDM symbol. From simulation results, the performance of the proposed scheme is shown better than that uses preamble symbols.
机译:在这封信中,提出了一种新颖的用于OFDMA系统上行链路的盲CFO估计算法。所提出的方法利用了OFDMA符号中的固有冗余信息,并且不需要额外的导频或前导开销。由于它是FFT后估计器,因此它不使用滤波器组在时域中将所需用户的信号与其他用户的信号分开。因此,特定用户的子载波不限于在频域中聚类。因此,所提出的估计器可以应用于包括IEEE 802.16e在内的在整个带宽上具有任意子载波分配的OFDMA系统,从而在频率选择性衰落信道中获得足够的频率分集。所提出的方法可以有效地用于仅通过单个OFDM符号内的两个FFT窗口连续跟踪所有活动用户的CFO。从仿真结果可以看出,与使用前导符号相比,该方案的性能更好。

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