Sampling Point Selection Scheme for Fractional Sampling-OFDM Receivers on Fast Time-Varying Multipath Channels
Sampling Point Selection Scheme for Fractional Sampling-OFDM Receivers on Fast Time-Varying Multipath Channels
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DOI：
10.1109/vetecf.2010.5594182
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发表时间：
2010-10
期刊：
影响因子：
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通讯作者：
Tatsuya Kobayashi;H. Nishimura;Y. Sanada
中科院分区：
文献类型：
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作者：
Tatsuya Kobayashi;H. Nishimura;Y. Sanada
OFDM接收机中的分数采样（FS）和多普勒分集均衡可以在时变多径信道上同时实现两种类型的分集（路径分集和多普勒分集）。然而，具有较高采样率的FS需要大量的解调复杂度。本文提出了一种在 FS-OFDM 接收机中采用 MMSE 均衡的新型采样点选择（SPS）方案。在快速时变多径信道上，所提出的方案从分数采样信号中选择适当的样本。通过计算机仿真表明，与传统的非SPS方案相比，采用所提出的方案，路径分集增益和多普勒分集增益都可以增加。
Fractional sampling (FS) and Doppler diversity equalization in OFDM receivers can achieve two types of diversity (path diversity and Doppler diversity) simultaneously on time-varying multipath channels. However FS with a higher sampling rate requires the large amount of complexity in demodulation. In this paper, a novel sampling point selection (SPS) scheme with MMSE equalization in FS-OFDM receivers is proposed. On fast time-varying multipath channels, the proposed scheme selects the appropriate samples from the fractionally sampled signals. Through the computer simulation, it is demonstrated that with the proposed scheme, both path diversity gain and Doppler diversity gain can increase as compared to a conventional non-SPS scheme.