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Dissertations / Theses on the topic 'Codec scheme'

Author: Grafiati

Published: 4 June 2025

Last updated: 15 July 2025

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1

Unal, Baris. "Robust Data Hiding Scheme With Turbo Codes." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606848/index.pdf.

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ABSTRACT ROBUST DATA HIDING SCHEME WITH TURBO CODES &Uuml<br>NAL, BariS M.S., Department of Electrical And Electronics Engineering Supervisor: Prof. Dr. R&uuml<br>yal ERG&Uuml<br>L December 2005, 127 pages This study describes the design and implementation of a robust data hiding algorithm which is provided by turbo codes. As the digital technology grows up, it is getting easy to copy and distribute multimedia products without getting legal permission. This has forced researchers to study in digital watermarking areas. Along with watermarking researches, data hiding studies have gained interes

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Arabaci, Murat. "Nonbinary-LDPC-Coded Modulation Schemes for High-Speed Optical Communication Networks." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/195826.

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IEEE has recently finished its ratification of the IEEE Standard 802.3ba in June 2010 which set the target Ethernet speed as 100 Gbps. The studies on the future trends of the ever-increasing demands for higher speed optical fiber communications show that there is no sign of decline in the demand. Constantly increasing internet traffic and the bandwidth-hungry multimedia services like HDTV, YouTube, voice-over-IP, etc. can be shown as the main driving forces. Indeed, the discussions over the future upgrades on the Ethernet speeds have already been initiated. It is predicted that the next upgrad

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3

Orlov, Dmitrij. "Identifikavimo schemos, naudojančios klaidas taisančius kodus." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2006~D_20140702_194641-43133.

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Detaliai apžvelgėme pagrindines schemų [Ste90] ir [Ste94] idėjas: tiek teorines, kurios buvo pasiūlytos aukščiau išvardintuose darbuose, tiek ir praktines, t.y. schemų realizacijos aspektus. Ištyrėme schemų saugumo aspektus: galimas atakas, įveikimo laiką esant vienodom pradinėm sąlygom. Palyginome nagrinėjamas schemas su kitomis žinomomis kriptografinėmis schemomis. Pateikėme schemų su prasmingais schemų parametrais veikimo greičių įvertinimus. Išvardijome nagrinėjamų schemų patobulinimo būdus. Aprašėme patobulintų schemų realizacijos pricipus. Ištyrėme patobulintų schemų saugumo aspektus.<br

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Yuan, Jin. "Secret sharing schemes from linear codes /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?COMP%202005%20YUAN.

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Ng, Soon Xin. "Coded modulation schemes for wireless channels." Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271574.

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6

Salazar-Lazaro, Carlos Harold Wilson R. M. Wilson R. M. "Association schemes, codes, and difference sets /." Diss., Pasadena, Calif. : California Institute of Technology, 2007. http://resolver.caltech.edu/CaltechETD:etd-05222007-003651.

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7

Benaddi, Tarik. "Sparse graph-based coding schemes for continuous phase modulations." Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/16037/1/Benaddi_Tarik.pdf.

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The use of the continuous phase modulation (CPM) is interesting when the channel represents a strong non-linearity and in the case of limited spectral support; particularly for the uplink, where the satellite holds an amplifier per carrier, and for downlinks where the terminal equipment works very close to the saturation region. Numerous studies have been conducted on this issue but the proposed solutions use iterative CPM demodulation/decoding concatenated with convolutional or block error correcting codes. The use of LDPC codes has not yet been introduced. Particularly, no works, to our know

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Zhao, Zhihong. "Performance improvement of polarization diversity scheme with space-time codes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0027/MQ51518.pdf.

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9

Zhou, Tingxian, Xiaohua Yin, and Xianming Zhao. "A New Error Control Scheme for Remote Control System." International Foundation for Telemetering, 1994. http://hdl.handle.net/10150/611658.

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International Telemetering Conference Proceedings / October 17-20, 1994 / Town & Country Hotel and Conference Center, San Diego, California<br>How to rise the reliability of the data transmission is one of the main problem faced by modern digital communication designers. This paper studies the error-correcting codes being suitable for the channel existing both the random and burst error. A new error control scheme is given. The scheme is a concatenated coding system using an interleaved Reed-Solomon code with symbols over GF (24) as the outer code and a Viterbi-decoded convolutional code as th

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10

Duo, Bin. "Polar Coding Schemes for Cooperative Transmission Systems." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/14619.

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: In this thesis, a serially-concatenated coding scheme with a polar code as the outer code and a low density generator matrix (LDGM) code as the inner code is firstly proposed. It is shown that that the proposed scheme provides a method to improve significantly the low convergence of polar codes and the high error floor of LDGM codes while keeping the advantages of both such as the low encoding and decoding complexity. The bit error rate results show that the proposed scheme by reasonable design have the potential to approach a performance close to the capacity limit and avoid error floor eff

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Moreira, Sánchez José. "On codes for traceability schemes: constructions and bounds." Doctoral thesis, Universitat Politècnica de Catalunya, 2013. http://hdl.handle.net/10803/134702.

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A traceability or fingerprinting scheme is a cryptographic scheme that facilitates the identification of the source of leaked information. In a fingerprinting setting, a distributor delivers copies of a given content to a set of authorized users. If there are dishonest members (traitors) among them, the distributor can deter plain redistribution of the content by delivering a personalized, i.e., marked, copy to each user. The set of all user marks is known as a fingerprinting code. There is, however, another threat. If several traitors collude to create a copy that is a combination of theirs,

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Chu, Li Electrical Engineering &amp Telecommunications Faculty of Engineering UNSW. "Space-time coded transmission schemes on wireless channels." Awarded by:University of New South Wales. Electrical Engineering & Telecommunications, 2007. http://handle.unsw.edu.au/1959.4/40880.

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Highly reliable and fast wireless communication services demand the communication channel capacity to be fully exploited. Vast amount of research effort have been expanded in the development of advance technologies, such as signal processing, channel coding, modulation/demodulation, diversity techniques, and so on. This thesis focuses on the development of space-time coded transmission schemes. In order to provide high diversity gain with minimum design complexity, we propose a closed-loop beamforming transmission technology combined with existing simple channel coding method. We show that th

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13

XAVIER, GUILHERME BARRETO. "MODULATION SCHEMES FOR FREQUENCY CODED QUANTUM KEY DISTRIBUTION." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2005. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=6483@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>A criptografia quântica foi proposta como uma solução para o problema da distribuição de chaves criptográficas com segurança total garantida pelos princípios da mecânica quântica. Através dessa técnica é possível saber se um espião tentou interceptar a transmissão, o que é impossível utilizando técnicas de transmissão clássicas. Nesse trabalho foi feito um breve resumo da teoria de criptografia quântica, de suas técnicas de transmissão e dos problemas tecnológicos enfrentados. Foi analisada em detalhes a técnica de transmis

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14

Yekhanin, Sergey. "Locally Decodable Codes and Private Information Retrieval Schemes." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/42242.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.<br>Includes bibliographical references (leaves 90-99).<br>This thesis studies two closely related notions, namely Locally Decodable Codes (LDCs) and Private Information Retrieval Schemes (PIRs). Locally decodable codes are error-correcting codes that allow extremely efficient, "sublinear-time" decoding procedures. More formally, a k-query locally decodable code encodes n-bit messages x in such a way that one can probabilistically recover any bit xi of the message by querying only

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15

Brown, Robert Springer 1958. "Collision biasing schemes for Monte Carlo transport codes." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/277288.

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Two "collision biasing" schemes have been tested in a major production, Monte Carlo neutron and photon transport code MCNP. The intent is to reduce the variance that is inherent in all Monte Carlo calculations and increase the Monte Carlo efficiency in problems where the phase space is not sampled adequately. The first scheme, called collision biasing, already exists in the French code TRIPOLI. This method samples several post-collision coordinates and randomly selects one in proportion to an input importance function. The second scheme, called track biasing, is original and differs from colli

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Valvo, Daniel William. "Repairing Cartesian Codes with Linear Exact Repair Schemes." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/98818.

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In this paper, we develop a scheme to recover a single erasure when using a Cartesian code,in the context of a distributed storage system. Particularly, we develop a scheme withconsiderations to minimize the associated bandwidth and maximize the associateddimension. The problem of recovering a missing node's data exactly in a distributedstorage system is known as theexact repair problem. Previous research has studied theexact repair problem for Reed-Solomon codes. We focus on Cartesian codes, and show wecan enact the recovery using a linear exact repair scheme framework, similar to the one

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17

Hof, Axel. "On concatenated coding schemes employing trellis coded modulation." Düsseldorf VDI-Verl, 2009. http://d-nb.info/994364539/04.

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18

Gao, Guang Rong. "A pipelined code mapping scheme for static data flow computers." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/37165.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1986.<br>MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING<br>Bibliography: leaves 245-252.<br>by Gao Guang Rong.<br>Ph.D.

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Lin, Rui. "Hybrid ARQ Schemes for Non-orthogonal Space-time Block Codes." Thesis, University of Canterbury. Electrical and Computer Engineering, 2007. http://hdl.handle.net/10092/1183.

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Automatic Repeat-reQuest (ARQ) schemes are extensively used in communication systems and computer networks to achieve reliable transmission. Using space-time codes (STCs) with multiple input multiple output (MIMO) or multiple input single output (MISO) systems is an effective way to combat multipath fading, which is the most severe impairment for wireless communication systems. STCs are designed to use the rich scattering multipath environment provided by using multiple transmit antennas. The work done in this thesis focuses on the use of ARQ schemes with non-orthogonal space-time block

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Mantha, Ramesh. "Hybrid automatic repeat request schemes using turbo codes and low-density parity check codes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0019/MQ58728.pdf.

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21

Wang, Xiaohan Sasha. "Investigation of Forward Error Correction Coding Schemes for a Broadcast Communication System." Thesis, University of Canterbury. Computer Science and Software Engineering, 2013. http://hdl.handle.net/10092/7902.

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This thesis investigates four FEC (forward error correction) coding schemes for their suitability for a broadcast system where there is one energy-rich transmitter and many energy-constrained receivers with a variety of channel conditions. The four coding schemes are: repetition codes (the baseline scheme); Reed-Solomon (RS) codes; Luby-Transform (LT) codes; and a type of RS and LT concatenated codes. The schemes were tested in terms of their ability to achieve both high average data reception success probability and short data reception time at the receivers (due to limited energy). The code

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22

Zerngast, Andrew J. "An improved neural network-based decoder scheme for systematic convolutional code." Thesis, Wichita State University, 2010. http://hdl.handle.net/10057/3757.

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This thesis explores the bit error rate (BER) characteristics of a convolutional decoder constructed of a backpropagation neural network (NN) using a newly proposed input shifting window. Due to the fact that each NN is independent and unique, multiple NNs are placed in parallel and utilize the majority rule to further improve BER performance. NNs are efficient in complex statistical systems because of their inherently fast parallel-processing speed and pattern-recognition abilities. It was found that with a code rate of ½ and a constraint length of K = 3, a NN with the optimal convolutional c

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23

Lunn, Timothy John. "Performance estimation and design of block coded modulation schemes." Thesis, University of York, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385293.

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24

Doradla, Vijay. "A new hybrid acquisition scheme for CDMA systems employing short concatenated codes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ40211.pdf.

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25

Vasic, Bata, and Bane Vasic. "A Runlength Coded LDPC Scheme for Insertion/Deletion Correction in Multimedia Watermarking." International Foundation for Telemetering, 2012. http://hdl.handle.net/10150/581840.

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We describe a simple and effective coding scheme for insertion/deletion channels. It is based on runlength coding which converts a class of insertion/deletion channels that have infinite memory into memoryless channels, which are much easier to handle. Runlength coding is then combined with powerful error correction low-density parity-check (LDPC) codes designed for memoryless channels. We consider a novel applications of this technique in multimedia watermarking using quantization index modulation operating on the three dimensional mesh vertices. The runlength LDPC coding recovers the data hi

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Hur, Woonhaing. "Incremental Redundancy Low-Density Parity-Check Codes for Hybrid FEC/ARQ Schemes." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14491.

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The objective of this dissertation is to investigate incremental redundancy low-density parity-check (IR-LDPC) codes for hybrid forward error correction / automatic repeat request (HybridARQ) schemes. Powerful capacity-approaching IR-LDPC codes are one of the key functional elements in high-throughput HybridARQ schemes and provide a flexible rate-compatible structure, which is necessary for low-complexity HybridARQ schemes. This dissertation first studies the design and performance evaluation of IR-LDPC codes, which have good error rate performance at short block lengths. The subset codes of t

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Oduol, Vitalice K. (Vitalice Kalecha). "A generalised type-II hybrid ARQ scheme with soft-decision decoding /." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66095.

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Deetzen, Neele von. "Modern coding schemes for unequal error protection." Aachen Shaker, 2009. http://d-nb.info/993093108/04.

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蔡錫欣. "Low Power Bus Codec Scheme with Gray Code." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/88486942264081638468.

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碩士<br>國立彰化師範大學<br>資訊工程學系<br>101<br>As technology advances, interconnect delay has become a significant element for circuit performance in deep sub-micrometers system on-chip designs. The data pattern dependent signal switching of crosstalk caused delays compels bus cycle time for the worst case in many digital processors. Because of on-chip bus power is dominated by the switching activities. So this method correlated switching and the proposed codec can effectively solve the above-mentioned problem. The paper are performed on 4-bits and 8-bits bus line based on TSMC 0.18μm, the experiment resu

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Shih-Wei, Lin, and 林詩緯. "A Progressive Image Authentication Scheme Base on JPEG 2000 Codec." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/23977291748077565877.

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碩士<br>國防大學中正理工學院<br>電子工程研究所<br>94<br>Image authentication is a very important part for image security. Image compression technologies change with each passing day. They not only improve compression efficiency, but also provide a rich set of features for variety of applications. An efficient image authentication method should be developed according to the characteristics of the compression technique itself. JPEG 2000 is an emerging standard for still image compression and is becoming the solution of choice for many digital imaging fields and applications. One important aspect of JPEG 2000 is it

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Chen, Sheng-Shiung, and 陳勝雄. "Effective Memory Reduction Scheme Used for Reference Frames in H.264/AVC Video Codec." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/19309141552404255136.

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Huang, Tien-Tsun, and 黃天村. "Code Merge Scheme (CMS) ：A Dynamic Scheme for Allocating OVSF Codes in WCDMA." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/65931137007826887420.

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碩士<br>國立中山大學<br>資訊工程學系研究所<br>89<br>Abstract Wideband-CDMA (WCDMA) is a kind of third-generation wireless communication system. It can provide multi-rate services and fast transmission with wideband technology. To improve the solution of no enough wireless bandwidth currently, the 3G communication systems have been researched and developed in several leading countries recently. WCDMA adopts a kind of new spreading codes named Orthogonal Variable Spreading Factor codes (OVSF codes) that have advantages of dynamically variable rates and keeping orthogonality. OVSF codes can provide diff

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Lai, Bi-Lien, and 賴碧蓮. "Decoding Long Convolutional Codes by Low Density Parity Check Code Decoding Schemes." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/67029037439222306454.

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碩士<br>逢甲大學<br>電子工程所<br>92<br>Since the improvement of wireless communication technology, it is impossible for people to be lacking of various wireless products gradually. Such as Cellular Phone, Wireless LAN, Bluetooth and so on, they bring our life convenience and enjoyment. However, the resources of the wireless frequency spectra are very limited and valuable. Hence every possible kind of methods to improve the transmission efficiency for wireless communication becomes the focus of research in communication systems. Use of error correction codes is a chief way to raise the transmission effic

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Mas??rov??, Zuzana. "Signing with Codes." Thesis, 2014. http://hdl.handle.net/10012/8162.

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Code-based cryptography is an area of classical cryptography in which cryptographic primitives rely on hard problems and trapdoor functions related to linear error-correcting codes. Since its inception in 1978, the area has produced the McEliece and the Niederreiter cryptosystems, multiple digital signature schemes, identification schemes and code-based hash functions. All of these are believed to be resistant to attacks by quantum computers. Hence, code-based cryptography represents a post-quantum alternative to the widespread number-theoretic systems. This thesis summarizes recent developme

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"Linking Scheme code to data-parallel CUDA-C code." Thesis, 2013. http://hdl.handle.net/10388/ETD-2013-12-1416.

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In Compute Unified Device Architecture (CUDA), programmers must manage memory operations, synchronization, and utility functions of Central Processing Unit programs that control and issue data-parallel general purpose programs running on a Graphics Processing Unit (GPU). NVIDIA Corporation developed the CUDA framework to enable and develop data-parallel programs for GPUs to accelerate scientific and engineering applications by providing a language extension of C called CUDA-C. A foreign-function interface comprised of Scheme and CUDA-C constructs extends the Gambit Scheme compiler and enables

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Chuang, Chun-Huan, and 莊鈞奐. "MDP-based OVSF Code Assignment Scheme." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/11804330346803670104.

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碩士<br>國立中正大學<br>資訊工程研究所<br>91<br>This thesis examines code management, assignment, and call admission problems in a CDMA system which employs orthogonal variable spreading factor codes. The proposed code management scheme, referred to as Smart OVSF Code Management Scheme, improves the time complexity of code management and code searching, and achieves a bound of the time complexity of code management, and code searching at O(log(SF)), and O(1), respectively. We also propose a call assignment scheme based on Markov Decision Process (MDP). The proposed scheme yields better performance than that

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"ROBUST DATA HIDING SCHEME WITH TURBO CODES." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606841/index.pdf.

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Lin, Yung-Seng, and 林育聖. "A PAPR Reduction Scheme Using Fountain Codes." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/29124278610733046070.

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碩士<br>元智大學<br>通訊工程學系<br>99<br>This thesis mainly discusses that using fountain codes to reduce the peak to average power ratio (PAPR) for OFDM systems. In previous research, the arrangement of the mapping from one fountain codeword to one OFDM symbol has been proven with the PAPR reduction performance similar to the well-known method of selective mapping (SLM). In this thesis, we focus on the arrangement of the mapping from one fountain codeword to n OFDM symbols due to the longer length of the codeword and evaluate its PAPR reduction performance. Besides, the arrangement of the mapping from m

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Lee, Jia-Jhan, and 李佳展. "Design Scheme of Space-Time Block Codes Concatenated with Turbo Codes." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/65108082199099493675.

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碩士<br>中興大學<br>電機工程學系所<br>95<br>The wireless channel suffers severe attenuation caused by multipath fading. The effective technique to mitigate multipath fading is to use the time or frequency diversity. The communication system with multiple input multiple output can combat the channel attenuation by spatial diversity and increase the channel information capacity. The principle of space-time coding schemes is to combine the concept of channel coding design and multiple transmit antennas, which are then effectively applied to multipath wireless channel. Since the amount of data transfer of

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Tsai, Chih-Pin, and 蔡智斌. "A Study on Adaptive OVSF Code Allocation Schemes for 2-D Spreading Coded OFCDM Communication Systems." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/41691415453607091802.

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碩士<br>朝陽科技大學<br>網路與通訊研究所<br>95<br>In this paper, we investigate the performance in a 2-D spreading orthogonal frequency coded division multiplexing (OFCDM) communication system over frequency and time selective fading channels. We propose a variance-based diversity gain (VBDG) estimation method from the sub-channels in the 2-D spreading coded OFCDM mobile communication systems. From experiments results, the time and frequency diversity gain in wireless channels can be approximate by proposed VBDG with a linear function. Moreover, an orthogalized code allocation (OCA) method is proposed to assi

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How, Tan Chik. "Codes in affine matrix schemes." 1992. http://catalog.hathitrust.org/api/volumes/oclc/28686275.html.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1992.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 100-104).

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Wang, Mao-Hua, and 王茂樺. "A Hybrid Coding Scheme that Combines Fountain Codes and Reed-Solomon Codes." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/72724580505627618670.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>100<br>Fountain codes have been widely discussed recently. The main characteristic is that the number of encoded packets is not fixed before the transmission. LT code is the first practical type of fountain code; it can achieve great performance and reach low coding and encoding complexities. Since LT codes act well on erasure channel, one might consider whether it can be applied on noisy channel. Because the inter-symbol interference (ISI), the packets may be contaminated. The detrimental effect of error propagation in LT hard decoding may occur. Belief propag

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Balasubramanian, Premkumar. "A new code division multiple access scheme." Thesis, 1992. http://spectrum.library.concordia.ca/4594/1/MM84705.pdf.

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In this thesis we evaluate by performance analysis and computer simulation the bit error and throughput characteristics of a new Code Division Multiple Access scheme. The new technique considered is of the Modified SUGAR/DS type. In this multiple access scheme, user signals may arrive in a code asynchronous fashion at the receiver. Each user is identified by an orthogonal waveform and a Gold code. The analytical results show the possibility of gaining a minimum of 2 dB in Signal-to-Noise Ratio by splitting the users into three or more groups in a PSWDS Spread Spectrum network. Both the chip sy

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Huang, Yu-Kai, and 黃昱凱. "A New Authentication Scheme Using QR Code." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/69669042458088672721.

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碩士<br>國立交通大學<br>資訊科學與工程研究所<br>98<br>The secret information is easier to be stolen in the traditional authentication way to enter account and password if a phishing site or the key logger exist. Forthermore, the password might be illegal used repeatly without knowing. Recently, the authentication method such as smart card, USB key, or OTP card needs the extra hardware cost and it is not easier to detect if it got lost because its lower using rate. However, the mobile phone today is one of the most common used and carry-on device. It would be detected in shorter time when a mobile gets lost beca

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Niu, Chun-Tao, and 牛君濤. "A Novel Optical Code-Division-Multiple-Access Network Architecture with Spectral / Spatial Coding Scheme Using Partial Modified Prime Codes." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/67341812720001210067.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>93<br>Code-division-multiple-access ( CDMA ) plays an important role in communications technologies nowadays. Almost all the modern communications techniques apply the concept of CDMA. The CDMA technology in mobile communications field has already been well-developed. CDMA has advantages such as multiple access, anti-jamming, high-level security, asynchronous transmission, multi-path resistance, and multi-rate transmission. Nevertheless, the interference between users so-called the multiple-user interference ( MUI ) degenerates the system performance. The MUI increa

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黃榮強. "Distributed OVSF Code Assignment Schemes." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/35242747159262150526.

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碩士<br>中華大學<br>資訊工程學系碩士班<br>90<br>Code-division multiple access (CDMA) techniques allow many users to transmit simultaneously in the same band without substantial interference by using approximately orthogonal spread-spectrum waveforms. In an OVSF-CDMA system, each user is assigned a single orthogonal variable-spreading-factor code; a higher data rate access is possible by using a lower spreading factor. In this thesis, we discuss the OVSF code management problem on Ad Hoc networks. To reduce call-blocking rate, we propose three different distributed schemes, which heavily exploit two technique

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Salazar-Lazaro, Carlos Harold. "Association schemes, codes, and difference sets." Thesis, 2007. https://thesis.library.caltech.edu/1946/1/thesis_final_v1.pdf.

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This thesis consists of an introductory chapter and three independent chapters. In the first chapter, we give a brief description of the three independent chapters: abelian $n$-adic codes; generalized skew hadamard difference sets; and equivariant incidence structures. In the second chapter, we introduce $n$-adic codes, a generalization of the Duadic Codes studied by Pless and Rushanan, and we solve the corresponding existence problem. We introduce $n$-adic groups, canonical pplitters, and Margarita Codes to generalize the "self-dual" codes of Rushanan and Pless, and we solve the correspond

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"Coding schemes for multicode CDMA systems." 2003. http://library.cuhk.edu.hk/record=b5891482.

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Zhao Fei.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2003.<br>Includes bibliographical references (leaves 87-89).<br>Abstracts in English and Chinese.<br>Chapter 1. --- Introduction --- p.1<br>Chapter 1.1 --- Multirate Scheme --- p.2<br>Chapter 1.1.1 --- VSF Scheme --- p.3<br>Chapter 1.1.2 --- Multicode Scheme --- p.5<br>Chapter 1.2 --- Multicode CDMA System --- p.7<br>Chapter 1.2.1 --- System Model --- p.7<br>Chapter 1.2.2 --- Envelope Variation of Multicode Signal --- p.9<br>Chapter 1.2.3 --- Drawback of Multicode Scheme --- p.11<br>Chapter 1.3 --- Organization of the Thes

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Wu, Yin-Feng, and 吳胤鋒. "REED-SOLOMON CODE MARKING SCHEME FOR IP TRACEBACK." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/22584421013727444395.

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碩士<br>國立東華大學<br>資訊工程學系<br>93<br>Recently, Denial of Service attack (DOS) and Distributed Denial of Service attack (DDOS) have drawn many attentions from human. Attackers send a huge number of attack packets with spoofed source address to the victim and consume its resources to let it work incompetently. Besides, the attackers usually use the spoofed IP source address to disguise their position. Therefore, it is difficult to trace the source of the attacks and make the attackers to be responsible for their behaviors. For this situation, several techniques about determination of IP have been dev

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Lin, Chien Chun, and 林千竣. "A spatial-coupled sparse code multiple access scheme." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/896z89.

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碩士<br>國立清華大學<br>通訊工程研究所<br>105<br>In recent years, the demand for high data transmission throughput grows significantly with the progress of the technologies for mobile communications. Most of these technologies are based on the idea of orthogonal multiple access (OMA) in current wireless systems. However, it is concerned that spectrum resources may not be fully exploited when considering conventional OMA schemes. Consequently, the non-orthogonal multiple access (NOMA), which is one of the promising radio access technique for 5G communication systems, is proposed. Comparing to OMA-based system

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