ML integer frequency offset estimation for OFDM systems with null subcarriers: Estimation range and pilot design
ML integer frequency offset estimation for OFDM systems with null subcarriers: Estimation range and pilot design
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DOI：
10.1007/s11432-010-4125-3
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发表时间：
2010-11
期刊：
影响因子：
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通讯作者：
F. Shu;S. Berber;Dongming Wang;Qingchuan Zhang;M. Wang
中科院分区：
文献类型：
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作者：
F. Shu;S. Berber;Dongming Wang;Qingchuan Zhang;M. Wang
本文进一步研究了任意空子载波（NSC）配置的估计范围（ERG），定义了实现满ERG的NSC配置的充分必要条件。然后，设计了一种理想的分布式NSC分配，其NSC距离大于相干带宽，以充分利用无线信道的频率分集并实现全ERG。仿真结果表明，在中高信噪比下，与现有的连续NSC分配方法相比，该方法具有更小的带宽开销、更充分的ERG和更好的性能。
In this paper the estimation range (ERG) of any null subcarriers (NSC) placement is further investigated and sufficient and necessary conditions of an NSC allocation that achieves a full ERG are defined. Then, a perfect distributed NSC allocation with the NSC distance larger than coherent bandwidth is devised to fully exploit frequency diversity of wireless channels and achieve a full ERG. Simulations confirmed that the propsoed FFT-based ML method of using this NSC placement has a smaller bandwidth overhead, achieves a fuller ERG and provides a better performance than the existing methods of using the consecutive NSC allocation at middle and high signal-to-noise ratios (SNRs).