Progressive Frequency Offset Compensation in Turbo Receivers
Progressive Frequency Offset Compensation in Turbo Receivers
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DOI：
10.1109/twc.2010.120610.101513
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发表时间：
2011-02
影响因子：
10.4
通讯作者：
Xiaofu Wu;Yue Song;Chunming Zhao;X. You
中科院分区：
文献类型：
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作者：
Xiaofu Wu;Yue Song;Chunming Zhao;X. You
在Colavolpe等人最近提出的迭代接收机的基础上，我们对其进行了扩展，进一步纳入了频率偏移补偿机制。该方法首先将长帧的因子图划分为短块的多个子图，由于子图的大小较小，可以很好地减轻频偏的影响，迭代解码可以顺利开始工作。随着迭代的进行，可以利用译码器的外部信息得到更精确的频偏估计。随着块大小逐步扩展到最终帧大小，系统性能可以稳步提高。
Based on the recently-proposed iterative receiver by Colavolpe et al., we extend it to further incorporate the mechanism of frequency offset compensation. As a progressive approach, the factor graph of a long frame is first divided into numerous subgraphs of short block, iterative decoding can successfully start its work as the effect of frequency offset can be well mitigated due to the small size of subgraph. As the iteration goes on, the extrinsic information from decoder can be employed to get finer estimate of the frequency offset. The system performance can be steadily improved as the block size is progressively expanded to the final frame size.