Covert channel is a type of secure communications that provides reliable security in transferring information between entities. Quantization Index modulation (QIM) technique can be used to embed data in images to impl...
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ISBN:
(纸本)9781479900800
Covert channel is a type of secure communications that provides reliable security in transferring information between entities. Quantization Index modulation (QIM) technique can be used to embed data in images to implement covert communication channels. In single embedding in QIM, each sample is quantized once to carry a single bit of the secret message. Double embedding in QIM was introduced by Sarkar and Manjunath in 2009, to increase the transferred data rate where a single sample is quantized twice to carry two bits in time. In this paper, a higher data transmission rate covert channel is developed using multiple embedding in the QIM framework with multi quantization vectors. This approach considers the embedding process as a communications problem, that it uses a structured scheme of multipletrellis-coded Quantization jointed with multipletrellis-codedmodulation (MTCQ/MTCM) to generate the stego-space. This technique returns a PSNR >= 40 dB. More over, increasing the coding states and/or the coding multiplicity returns an altered space with low correlated coefficients, thus improving the transferred data detection error rate performance. To secure the modulation process, the altered coefficients are chaotic scrambled by the 2-D Arnold Cat Map before embedding to increase the uncertainty in case of an attacker discovered the channel.
The design of space-time (ST) codes employing multiple trellis coded modulation (MTCM) is considered. This structure is shown to be necessary for achieving maximum transmit diversity gain when using trellis codes with...
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The design of space-time (ST) codes employing multiple trellis coded modulation (MTCM) is considered. This structure is shown to be necessary for achieving maximum transmit diversity gain when using trellis codes with parallel paths. Systematic code search procedures with low complexity are described based on the properties of ST-MTCM codes. It is illustrated that, if the trellis branches are properly labeled, the overall coding gain can be made larger than that achieved by conventional ST codes with the same transmission rate and the same number of states.
作者：
Wang DuanyiHu ZhcngmingP.O.Box 145
Dept.of Information Engineering Beijing University of Posts and Telecommunications Beijing 100088P.R.China
Based on an extensive analysis on the advantages and potentials of multiple trellis coded modulation(MTCM),an efficient design method of trelliscodedmodulation system for the channels with any de
ISBN:
(纸本)0780329163
Based on an extensive analysis on the advantages and potentials of multiple trellis coded modulation(MTCM),an efficient design method of trelliscodedmodulation system for the channels with any de
A brief survey of recent developments in combined channel coding and digital modulation (in short codedmodulation) for Rayleigh fading channels is presented. Theoretical guidance for design and identification of the ...
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ISBN:
(纸本)0780324404
A brief survey of recent developments in combined channel coding and digital modulation (in short codedmodulation) for Rayleigh fading channels is presented. Theoretical guidance for design and identification of the most important system parameters are given. Two constructive schemes that are suited for the fading channel are discussed. The systematic design method for codedmodulation on the fading channel is summarized, which can construct codedmodulation systems to give optimum asymptotic performance on the fading channel. Some proposed schemes are compared according to the design method.
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