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论文类型：期刊论文

发表时间：2018-01-01

发表刊物：AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS

收录刊物：SCIE、EI

卷号：87

页面范围：101-106

ISSN号：1434-8411

关键字：Asynchronous physical layer network coding; Two way relay; Channel estimation; Delay estimation

摘要：Relative Delay estimation is an important issue for asynchronous physical layer network coding (PLNC). In this paper, an fast Fourier transform (FFT) based channel and delay estimation method for asynchronous PLNC is proposed. The extended properties of discrete Fourier transform are exploited to design the pilots, which makes the pilots from different nodes orthogonal in frequency domain. Then channels between relay and different terminal nodes are estimated separately in frequency domain. Finally, after inverse FFT, the relative delay is extracted from the estimated time domain channel information. Compared with the existing approaches, the proposed method can achieve almost the same performance, but with significant improvement in computational complexity.