Blind Compensation for Phase Noise in OFDM Systems over Constant Modulus Modulation
Blind Compensation for Phase Noise in OFDM Systems over Constant Modulus Modulation
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DOI：
10.1109/tcomm.2011.121511.110088
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发表时间：
2012-03
影响因子：
8.3
通讯作者：
Myung-Kyu Lee;Seung-Chan Lim;Kyeongcheol Yang
中科院分区：
文献类型：
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作者：
Myung-Kyu Lee;Seung-Chan Lim;Kyeongcheol Yang
为了补偿恒模调制下的正交频分复用(Ofdm)系统中非理想振荡器引起的相位噪声，提出了一种盲算法。在该算法中，一个接收到的ofdm符号在时间域内被分割成多个子块，每个子块上的相位噪声被近似为其时间平均。在该近似下，每个子载波处的信道增益乘以数据码元的平方幅度被示为表示为这些时间平均值和在具有零填充的每个子块处的接收样本的离散傅立叶变换(DFT)系数。基于这种关系，该算法在没有导频符号的情况下补偿了相位噪声。数值结果表明，该算法在计算复杂度较低的情况下，性能优于传统算法。
A blind algorithm is proposed in order to compensate for the phase noise resulting from imperfect oscillators in orthogonal frequency-division multiplexing (OFDM) systems over constant modulus modulation. In the proposed algorithm, one received OFDM symbol is partitioned into subblocks in the time domain and the phase noise over each subblock is approximated as its time-average. Under the approximation, the squared magnitude of the channel gain multiplied by the data symbol at each subcarrier is shown to be expressed in terms of these time-averages and the discrete Fourier transform (DFT) coefficients of the received samples at each subblock with zero padding. Based on the relation, the proposed algorithm compensates for the phase noise without pilot symbols. Numerical results show that the proposed algorithm outperforms conventional algorithms as well as it requires lower computational complexity.