Implementation of PCCD-OFDM-ASK Robust Data Transmission over GSM Speech Channel

Mezgec, Zdenko; Chowdhury, Amor; Kotnik, Bojan; Svečko, Rajko

doi:10.15388/informatica.2009.237

Cited by 13 publications

(7 citation statements)

References 15 publications

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“…Since then, cellular vocal networks have attracted attention as a potential high-priority, low-bandwidth data communication channel with errors. The work on Data over Voice (DoV) technology in cellular networks enabled new applications, such as emergency call system eCall [Werner et al, 2009], messaging over voice [Dhananjay et al, 2010], point of sell (POS) financial transactions [Mezgec et al, 2009], automatic network address translator (NAT) traversal [Patro et al, 2011], and secure data and voice communications [Katugampala et al, 2005, Chen andGuo, 2011].…”

Section: Motivationmentioning

confidence: 99%

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Joint source-cryptographic-channel coding for real-time secure voice communications on voice channels

Krasnowski¹

2022

Preprint

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This thesis aims to develop, analyze, and validate secure and efficient schemes for real-time speech encryption and transmission via modern voice channels. In addition to speech encryption, this study covers the security and operational aspects of the whole voice communication system, as this is relevant from an industrial perspective.The thesis introduces a joint speech encryption scheme with lossy encoding, which randomly scrambles the vocal parameters of some speech representation (loudness, pitch, timbre) and outputs an encrypted pseudo-voice signal robust against channel distortion. The enciphering technique is based on random translations and random rotations using lattices and spherical codes on flat tori. Against transmission errors, the scheme decrypts the vocal parameters approximately and reconstructs a perceptually analogous speech signal with the help of a trained neural-based voice synthesizer. The experimental setup was validated by sending encrypted pseudo-voice over a real voice channel, and the decrypted speech was tested using subjective quality assessment by a group of about 40 participants.Furthermore, the thesis describes a new technique for sending data over voice channels that relies on short harmonic waveforms representing quaternary codewords. This technique achieves a variable bitrate up to 6.4 kbps and has been successfully tested over various real voice channels. Finally, the work considers a dedicated cryptographic key exchange protocol over voice channels authenticated by signatures and a vocal verification. The protocol security has been verified in a symbolic model using Tamarin Prover.The study concludes that secure voice communication over real digital voice channels is technically viable when the voice channels used for communication are stationary and introduce distortion in a predictable manner.

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Section: Motivationmentioning

confidence: 99%

“…An inspiring technique based on Amplitude Shift Keying (ASK), named PCCD-OFDM-ASK, has been presented by Mezgec et al [Mezgec et al, 2009]. Phase-Continuity and Context Dependency (PCCD) refers to techniques providing phase continuity of the modulated signal.…”

Section: Motivationmentioning

confidence: 99%

Joint source-cryptographic-channel coding for real-time secure voice communications on voice channels

Krasnowski¹

2022

Preprint

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“…To simplify the problem, let's extend the search space to the continuous space of all joint probability densities on X and Y denoted by the matrix P = [p ij ]. Using this assumption and considering equiprobable X symbols as in (7), the two optimisation problems can be formulated as (11) and (12)…”

Section: Symbol Error Rate Vs Capacity Optimisationmentioning

confidence: 99%

“…Theorem 2: Assume that both versions of the proposed algorithm are applied to the same initial codebook and make similar random substitutions in each iteration. In this case, the capacity and SER objective functions lead to the same codebook sequence if the initial codebook is close enough to the unique optimum solution of the problems (11) and (12).…”

Section: Lemmamentioning

confidence: 99%

“…It has been proposed in the wikiwalk system for pedestrian guidance [8] and in the eCall recommendation by European Telecommunications Standards Institute (ETSI) [9] for monitoring road safety issues [8,10]. The same data modem has also been proposed for real-time and safe transmission of the transaction information through the voice channel in point of sale payment systems [11]. Finally, Ghosh et al [12] suggests this modem for remote condition monitoring of power apparatus in smart grids.…”

Section: Introductionmentioning

confidence: 99%

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Efficient codebook design for digital communication through compressed voice channels

Mashhadi

Behnia

2016

IET Communications

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The common voice channels existing in cellular communication networks provide reliable, ubiquitously available and top priority communication mediums. These properties make voice dedicated channels an ideal choice for high priority, real time communication. However, such channels include voice codecs that hamper the data flow by compressing the waveforms prior to transmission. This study designs codebooks of speech-like symbols for reliable data transfer through the voice channel of cellular networks. An efficient algorithm is proposed to select proper codebook symbols from a database of natural speech to optimise a desired objective. Two variants of this codebook optimisation algorithm are presented: One variant minimises the symbol error rate and the other maximises the capacity achievable by the codebook. It is shown both analytically and by the simulation results that under certain circumstances, these two objective functions reach the same performance. Simulation results also show that the proposed codebook optimisation algorithm achieves higher data rates and lower symbol error rates compared with previously reported results while requiring lower computational complexity for codebook optimisation. The Gilbert-Elliot channel model is utilised to study the effects of adaptive compression rate adjustment of the vocoder on overall voice channel capacity. Finally, practical implementation issues are addressed.

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The Vulnerability Exploitation Conveying Digital Data Over Mobile Voice Call Channels

Lee¹,

Yoon³

et al. 2017

Wireless Pers Commun

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Implementation of PCCD-OFDM-ASK Robust Data Transmission over GSM Speech Channel

Cited by 13 publications

References 15 publications

Joint source-cryptographic-channel coding for real-time secure voice communications on voice channels

Joint source-cryptographic-channel coding for real-time secure voice communications on voice channels

Efficient codebook design for digital communication through compressed voice channels

The Vulnerability Exploitation Conveying Digital Data Over Mobile Voice Call Channels

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