基于OFDM信号循环前缀的数字水印技术
首发时间:2007-03-23
摘要:本文将数字水印技术应用于OFDM调制的无线多径信道中,提出了一种基于OFDM循环前缀的数字水印算法。在传输前,将水印信号插入到时域信号的循环前缀中,在接收端,利用整个OFDM信号的平均时间偏移量与单个并行信号的时间偏移量之差进行盲提取水印。实验表明,该水印算法对无线信道的多径时延有良好的鲁棒性。
关键词: OFDM 16-QAM 循环前缀 数字水印 多径时延
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An Watermarking Based on OFDM Cyclic Prefix
Abstract:Based on OFDM, this paper presents a watermarking algorithm in wireless multi-path channel. Before the carrier is transmitted, the watermark is applied one-to-one to the cyclic prefix of OFDM signals. At the receiver, the watermark can be extracted blindly by comparing the difference between the average time offset over multiple OFDM symbols and the tracking algorithm estimate of the time offset of each individual OFDM symbol. Experimental results prove that the watermark algorithm is robust to multi- path time delay in the wireless channel.
Keywords: OFDM, 16-QAM, cyclic prefix, digital watermarking, multi-path time delay
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No.1161310581011746****
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