hybrid spread spectrum 中文意思是什麼
hybrid spread spectrum
解釋
混合擴頻-
Then, based on the theory of discrete fourier transform, discrete cosine transform and discrete wavelet transform, two invisible image watermarking schemes in transform domain are proposed, one is circular symmetric spread spectrum digital image watermarking based on chaotic sequences, the other is the hybrid image watermarking based on wavelet decomposition and discrete cosine transform. finally, the good performance of the two algorithms is verified by some common image processing and attack experiments
在分析了dft 、 dct 、 dwt的理論與演算法的基礎上，提出了兩種基於變換域的圖像隱形水印方案? ?基於混沌序列的圓對稱擴頻水印方案和基於小波分解和餘弦變換結合的水印方案，並通過一些常見的圖像處理及攻擊實驗驗證了這兩種演算法生成水印的性能。 -
In addition, hybrid spread - spectrum communication system is propitious to enhance anti - jamming performance of the system that is make up of direct sequence ( ds ) and frequency hopping ( fh ), and it can satisfy the require of anti - jamming of systems. it concentrate their virtue and overcome shortage in single spread spectrum style. this paper discusses the aspect in detail
另外，將擴頻技術中應用最廣泛的兩項技術直序擴頻（ ds ）和跳頻（ fh ）結合在一起，構成混合擴頻通信系統，有利於提高系統的抗干擾性能，更能滿足系統抗干擾的要求，而且將跳頻系統和直擴系統的優點集中起來，克服了單一擴頻方式的不足。 -
Combining walsh sequence with direct spread spectrum sequence, we can construct hybrid ds - fh spread - spectrum communication mode. this is very important for the mode to have better performance on anti - multiple - access inference and anti - near - far inference
將walsh函數序列與直接擴頻序列相結合構成的ds - fh混合擴頻通信方式對于系統抗多址干擾和遠近效應具有重要意義。 -
Ds / fh hybrid spread - spectrum communication system base on software radio is researched in theory. performance of the system is analyzed and evaluated in anti - jamming by software simulation. so it testify feasibility of the system
本課題針對這方面作了詳細地討論，就基於軟體無線電技術的ds fh混合擴頻通信系統從理論方面進行了研究，通過模擬，對系統在抗干擾方面的性能作了分析，並進行了性能評估，從而驗證了系統的可行性。 -
To assure that the hybrid ds - fh spread - spectrum communication mode has better capability of information safety and inference suppression, i bring forward a design scheme of ds - fh spread - spectrum communication system and solving effectively the crucial problem such as how to choose the user address, how to choose the hopping frequency and how to avoid the collision of the frequency which is used by different users at the same time
為保證系統可靠、有效地工作，本文提出了一種ds - fh混合擴頻系統的設計方案，並且有效地解決了系統的用戶選址、頻率選擇和頻率碰撞等關鍵問題。通過系統設計模擬證實了ds - fh混合擴頻系統具有優于ds系統的抗干擾性能，並在一定程度上提高了系統的抗遠近效應能力。 -
Simulation results show that it is effectiveness and the synchronization technique is robust. using quasi - stochastic property and ergodic theory of chaos, a kind of new hybrid ds / sfh spread spectrum communication scheme is presented based on vss synchronization technique
在變結構混沌同步方法的基礎上，利用混沌系統的遍歷性和偽隨機性，提出了一種新的保密性很強的混合ds sfh擴頻通信系統設計方案。 -
Performance analysis of coded noncoherent hybrid ds - sfh spread spectrum communication systems
擴頻通信系統性能分析 -
Hybrid spread spectrum
混合擴頻 -
For image copyright protection, we propose a novel hybrid watermarking algorithm by thorough analysis of two classes of watermark embedding methods : one based on spread spectrum technique and the other one based on quantization technique
針對圖像版權保護應用，我們對基於擴頻技術和基於量化技術的兩類水印嵌入方法進行了深入分析，綜合兩種水印嵌入方法的優點提出了一種新穎的混合盲水印演算法。 -
A new hybrid spread - spectrum ( ds - fh ) communication mode is discussed in detail in this paper, walsh sequence is used as frequency - hopping sequence in this mode
本文將討論一種新型的ds - fh混合擴頻通信系統。在這種系統中，使用walsh函數序列作為跳頻序列。
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