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3rd International Conference on Computing Communication and Networking Technologies (ICCCNT)

作者： Channapragada, Rama Seshagiri Rao Prasad, Munaga V. N. K. Geethanjali Coll Engn & Technol Dept CSE Cheeryal V 501301 AP India IDRBT Hyderabad Andhra Pradesh India

ISBN: (纸本)9781467356930

This paper pro poses a watermarking algorithm to embed the watermark into the original image by using complete complementary code method. Spread spectrum communication systems use the spread sequences that have good correlation properties. complete complementary code (CCC) is a set of spread sequences, and has an ideal auto- and cross-correlation properties. Watermark extraction procedure has also been dealt with. It is found that the algorithm implementation on various 24 bit color images have proven that the strength of the algorithm is as required.

关键词： Digital watermarking complete complementary code cross correlation PSNR

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Robust Animation Zero Watermarking Based on Visual Cryptography and complete complementary code

Robust Animation Zero Watermarking Based on Visual Cryptogra...

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12th KIPS International Conference on Ubiquitous Information Technologies and Applications (CUTE) / 9th International Conference on Computer Science and its Applications (CSA)

作者： Li, De Cui, Lihua Yanbian Univ Dept Comp Sci Yanji Peoples R China Yanbian Univ Coll Econ & Management Yanji Peoples R China

ISBN: (纸本)9789811076053;9789811076046

In this paper, the experiment use common animation fragments of network as the original vector video. Firstly, we randomly select some frames from the vector video frames to embed the watermarking information. Secondly, the 2D DWT and pseudo 3D DCT transform is chosen as the processing mode to process vector video frames in the processing of transform domain. In addition, using the log polar coordinate transformation and singular value decomposition process vector video to get a binary sequence. Thirdly, in order to enhance the robustness and security of zero watermarking, we use the complete complementary code to spread spectrum the watermarking signal, and use the visual cryptography to encrypt and decompose the secret watermarking image under chaotic scrambling. Finally, in order to verify the robustness and feasibility of algorithm, we carry on the contrast experiment of two algorithms. It shows that this paper algorithm is improved against Gaussian noise, filtering and frame averaging attacks.

关键词： Log polar coordinate transform Singular value decomposition complete complementary code Visual cryptography Chaotic scrambling

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Application of Biphase complete complementary code for Ionospheric Sounding

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SENSORS 2018年第9期18卷 2811-2811页

作者： Yang, Guobin Duan, Peng Jiang, Chunhua Liu, Tongxin Lan, Ting Zhao, Zhengyu Shi, Shuzhu Xu, Chen Wuhan Univ Sch Elect Informat Wuhan 430072 Hubei Peoples R China Wuhan Univ Sch Remote Sensing & Informat Engn Wuhan 430079 Hubei Peoples R China

This paper illustrates the processes carried out for the application of biphase complete complementary code (CCC) for ionospheric sounding to address the coherent interference problem in multi-station ionospheric sounding. An algorithm to generate the biphase CCC is described, and the detailed process of waveform construction and signal processing is presented. Characteristics of the autocorrelation and cross-correlation are analyzed through simulations, and the technical feasibility of the application of CCC is explored. Experiments of ionospheric sounding with the CCC are also implemented to verify performance. Results demonstrate that the CCC performs well in multi-station ionospheric sounding, and is capable of eliminating the coherent interference in the network of ionosondes, compared to the conventional complementary code.

关键词： coherent interference multi-station ionospheric sounding complete complementary code

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A Novel Ionospheric Sounding Network Based on complete complementary code and Its Application

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SENSORS 2019年第4期19卷 779-779页

作者： Liu, Tongxin Yang, Guobin Hu, Yaogai Jiang, Chunhua Lan, Ting Zhao, Zhengyu Ni, Binbin Wuhan Univ Sch Elect Informat Wuhan 430072 Hubei Peoples R China

In this paper, complete complementary code (CCC) sequences are applied to a High Frequency (HF) ionospheric sounding network. Ionosondes distributed at multiple locations use the mutually orthogonal CCC sequences to conduct vertical soundings synchronously. At the same time, thanks to the omnidirectional antennas, every station can receive the oblique echoes transmitted from the others. Due to the orthogonality between the code sequences, both vertical and oblique ionograms can be simultaneously obtained and completely separated. Through this method, the sounding efficiency can be enhanced, and the inversion difficulty can be reduced. Further, by using the data assimilation method, vertical and oblique sounding results can be combined to obtain a wide range of regional ionospheric characteristics. To verify the performance of this kind of sounding network, validation experiments are implemented to demonstrate that vertical and oblique ionograms can be obtained independently at the same time and inverted separately and that the maps of foF2 parameters obtained by using the data assimilation method provide more details than single vertical or oblique sounding.

关键词： ionospheric sounding network complete complementary code ionogram inversion data assimilation

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Properties of a Convoluted-Time and code Division Multiple Access Communication Systems Based upon complete complementary codes

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2008年第10期E91A卷 2881-2884页

作者： Kojima, Tetsuya Aono, Masahiro Tokyo Natl Coll Technol Dept Comp Sci Hachioji Tokyo 1930997 Japan

A convoluted-time and code division multiple access (CT-CDMA) communication system based on complete complementary codes has been proposed. In this letter, the properties of this communication system are discussed and... 详细信息

关键词： CDMA CT-CDMA complete complementary code

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On a convoluted-time and code division multiple access communication system using complete complementary codes

On a convoluted-time and code division multiple access commu...

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3rd International Workshop on Signal Design and Its Applications in Communications (IWSDA 07)

作者： Kojima, Tetsuya Aono, Masahiro Tokyo Natl Coll Technol Tokyo Japan

ISBN: (纸本)9781424410736

Signal design methods for the approximately synchronized CDMA systems based on complete complementary codes have been proposed. It has been shown that both the information transmission rate and the frequency usage rate can be increased by these kinds of CDMA systems. However, there are two big problems, that is, the small cell capacity and the large signal power. In this paper, we consider another communication system based on complete complementary codes, which is called the convoluted-time and code division multiple access (CT-CDMA) system. We give both the merits and the shortcomings of this method, and discuss the way to apply this system into some actual communication applications.

关键词： CDMA CT-CDMA complete complementary code

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On a Convoluted-Time and code Division Multiple Access Communication System Using complete complementary codes

On a Convoluted-Time and Code Division Multiple Access Commu...

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第三届信号设计及其在通信中的应用国际会议(Proceedings of 2007 International Workshop on Signal Design and Its Applications in Communications IWSDA'07)

作者： Tetsuya KOJIMA Masahiro AONO Tokyo National College of Technology Hachioji Tokyo Japan

Signal design methods for the approximately synchronized CDMA systems based on complete complementary codes have been proposed. It has been shown that both the information transmission rate and the frequency usage rate can be increased by these kinds of CDMA systems. However, there are two big problems, that is, the small cell capacity and the large signal power. In this paper, we consider another communication system based on complete complementary codes, which is called the convoluted-time and code division multiple access (CT-CDMA) system. We give both the merits and the shortcomings of this method,and discuss the way to apply this system into some actual communication applications.

关键词： CDMA CT-CDMA complete complementary code

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Constructions of Spectrally Null Constrained complete complementary codes via the Graph of Extended Boolean Functions

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IEEE TRANSACTIONS ON INFORMATION THEORY 2023年第9期69卷 6028-6039页

作者： Shen, Bingsheng Yang, Yang Zhou, Zhengchun Mesnager, Sihem Southwest Jiaotong Univ Sch Math Chengdu 611756 Peoples R China Southwest Jiaotong Univ Sch Informat Sci & Technol Chengdu 611756 Peoples R China Univ Paris VIII Dept Math F-93526 Paris France Univ Paris XIII Sorbonne Paris Cite LAGA CNRSUMR 7539 F-93430 Villetaneuse France Polytech Inst Paris Telecom Paris F-91120 Palaiseau France

complete complementary codes (CCCs) have important applications in communication, radar, and information security. In modern communication and radar systems, certain spectrum is reserved or prohibited from transmission, which leads to the so-called spectrally null constrained (SNC) problem. Compared with vast works on conventional CCCs, relatively little is known about SNC-CCCs. One objective of this paper is to derive several constructions of CCCs with more flexible settings from the graph of extended Boolean functions. This generalizes earlier achievements on CCCs from recent literature. Another objective of this paper is to employ the graphs of extended Boolean functions and polynomial representation of sequences to construct SNC-CCCs.

关键词： complete complementary code spectrally null constrained extended Boolean function graph

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A complete complementary coded MIMO System and Its Performance in Multipath Channels

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IEEE WIRELESS COMMUNICATIONS LETTERS 2014年第2期3卷 181-184页

作者： Han, Shuai Venkatesan, R. Chen, Hsiao-Hwa Meng, Weixiao Li, Cheng Yang, Pei-Yu Harbin Inst Technol Harbin Peoples R China Natl Cheng Kung Univ Dept Engn Sci Tainan 701 Taiwan Mem Univ Newfoundland St John NF A1C 5S7 Canada

In this paper, we propose a new system architecture using complete complementary (CC) codes for a multicarrier MIMO CDMA system to combat multipath fading in wireless channels. Unlike traditional MIMO systems, complementary codes were designed at chip-level to achieve time and frequency-spreading for each antenna. We analyze the system performance in multipath fading channels. A closed form expression of bit error rate (BER) performance is obtained. Extensive simulations were conducted to verify the analytical results. Our results indicate that a CC coded MIMO system can effectively decrease BER and take advantage of diversity gain.

关键词： MIMO space-time coding complete complementary code

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A New Construction Method of Zero-Correlation Zone Sequences Based on complete complementary codes

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2008年第12期E91A卷 3698-3702页

作者： Han, Chenggao Hashimoto, Takeshi Suehiro, Naoki Univ Electrocommun Dept Elect Engn Chofu Tokyo 1828585 Japan Univ Tsukuba Grad Sch Syst & Informat Engn Tsukuba Ibaraki 3050006 Japan

In approximately synchronous CDMA (AS-CDMA) systems, zero correlation zone (ZCZ) sequences are known as the sequences to eliminate co-channel and multi-path interferences. Therefore, numerous constructions of zero correlation zone (ZCZ) sequences have been introduced e.g. based on perfect sequences and complete complementary codes etc. However, the previous construction method which based on complete complementary code is lacking for merit figures when none of whose elements are zero. In this paper, a new construction method of ZCZ sequences based on complete complementary codes is proposed. By proposed method, non zero elements ZCZ sequences whose merit figure is greater than 1/2 are constructable.

关键词： complementary sequences Golay's sequence complete complementary code N-shift cross orthogonal sequence zero correlation zone

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