An Improved ICI Cancellation Method to Reduce the Impact of Frequency Offset in OFDM Systems
An Improved ICI Cancellation Method to Reduce the Impact of Frequency Offset in OFDM Systems
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DOI：
10.1109/cicn.2015.102
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发表时间：
2015-12
期刊：
影响因子：
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通讯作者：
Silky Pareyani;Prabhat Patel
中科院分区：
文献类型：
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作者：
Silky Pareyani;Prabhat Patel
在正交频分复用通信系统（OFDM）中，频偏问题非常严重。原因在于频率偏移扰乱子载波之间的正交性关系并且导致称为载波间干扰（ICI）的干扰。本文研究了现有的载波间干扰自消除方法，提出了一种新的有效的方法来抑制频偏对OFDM系统的影响。该方法包括两个简单的步骤。第一步在发射机端执行，其中数据符号及其共轭被映射到四个子载波上。第二步在接收机端执行，在接收机端接收信号被线性组合。结果是充分地减少了存在于子载波之间的ICI。该方法是支持与数学工作，并在MATLAB上进行了仿真，证明了我们提出的方法降低了误码率（BER）在更大程度上，也增加了载干比（CIR）比现有的自消除方案。
The problem of frequency offset is very serious in case of orthogonal frequency division multiplexing communication systems (OFDM). The reason is that the frequency offset disturbs the relation of orthogonality among the sub carriers and lead to an interference known as inter-carrier interference (ICI). This paper studies the existing inter-carrier interference self cancellation methods and proposes a new and effective method to suppress the effect of frequency offset on OFDM systems. The method comprises of two simple steps. The first step is carried out at the transmitter end where a data symbol and its conjugate are mapped onto four sub carriers. The second step is carried out at the receiver end where the received signals are linearly combined. The result is that the ICI existing among the sub carriers is sufficiently reduced. The proposed method is supported with mathematical work and the simulation is done on MATLAB which proves that our proposed method reduces the bit error rate (BER) to a greater extent and also carrier-to-interference ratio (CIR) is increased than the existing self cancellation schemes.