Finally, making use of autocorrelation function characteristic of spread spectrum sequence, watermark information was detected. In the detection process, it is not requisite for initial carrier image.
最后利用扩频序列的自相关函数特征检测出水印信息，检测过程中不需要原始载体图像。
Afterward, we can gain spread spectrum sequence by sampling and quantizing the analog chaotic signals.
对输出的模拟混沌信号进行过采样和最优量化，可得到性能优良的扩频序列。
This paper proposes a problem that the error tolerance property of spread spectrum sequence influences the performance of spread spectrum system.
提出了扩频码（序列）容错能力影响扩频系统的性能的问题。
Capturing spread spectrum sequence is the premise of spread spectrum communication.
扩频码的捕获是扩频通信的前提。
Two new methods are developed for blind estimation for long-code chaotic spread spectrum sequence.
针对长码实值混沌直扩系统，提出了两种盲解扩算法。
The design of bit decision algorithm is a key technique for the DS spread spectrum sequence to be received correctly.
码元判决算法的设计是扩频序列能被正确接收的关键技术之一。
Chaos masking, chaotic parameter modulation, chaos shift keying, chaotic spread spectrum sequence are discussed in detail.
其中重点分析了混沌掩盖技术，混沌参数调制技术，混沌键控技术和混沌扩频技术的原理。
A new method of blind estimation for short-code chaotic spread spectrum sequence is proposed, which is based on principal component analysis (PCA) and has good performance at low SNR condition.
针对短码实值混沌直扩系统，提出了一种基于主元分析的算法，实现了在低信噪比下对直扩序列的盲估计。
A new method of blind estimation for short-code chaotic spread spectrum sequence is proposed, which is based on principal component analysis (PCA) and has good performance at low SNR condition.
针对短码实值混沌直扩系统，提出了一种基于主元分析的算法，实现了在低信噪比下对直扩序列的盲估计。
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