A data modem for GSM Adaptive Multi Rate voice channel

Boloursaz, Mohammad Reza; Hadavi, Amir Hossein; Kazemi, Reza; Behnia, Fereidoon

doi:10.1109/ewdts.2013.6673152

Cited by 12 publications

(4 citation statements)

References 6 publications

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“…In this research, speech like symbols are used for data communication through GSM voice channel because of their acceptable performance as reported by [3], [9].The following section chooses these samples to attain a lower bound for the GSM voice channel.…”

Section: Proposed Methodsmentioning

confidence: 99%

“…This modem was tested on GSM HR (Half rate), FR (Full Rate), AMR (Adaptive Multi Rate) and EFR (Enhanced Full Rate) voice codecs and achieved a throughput of 4kbps with 2.5% Symbol Error Rate (SER) on EFR voice codec. Boloursaz et al [9] modeled the AMR voice codec by a discrete memoryless channel and generated the codebook by searching for the symbol set that maximizes this channel's capacity. The symbols where chosen from a database of waveforms derived from observed human speech.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A lower capacity bound of secure end to end data transmission via GSM network

Kazemi

Mosayebi

Etemadi

et al. 2012

6th International Symposium on Telecommunications (IST)

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Global System for Mobile communications (GSM) is a widely spread, reliable and P2P channel through all over the world. These characteristics make GSM a channel suitable for a variety of applications in different domains especially security applications such as secure voice communication. Performance and usage of GSM applications extremely depends on the transmission data rate. Hence, transmitting data over GSM is still an attractive topic for research. This paper considers the problem of digital data transmission through the GSM voice channel. A lower capacity bound for data transmission through the GSM Adaptive Multi Rate (AMR) voice codec is presented. The GSM channel is modeled in a simple manner to overcome it's memory and non-linearity effects. A new statistic based on received samples is extracted and a novel method to transmit data over that channel which asymptotically tends to the achieved lower bound is offered.

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Section: Proposed Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A lower capacity bound of secure end to end data transmission via GSM network

Kazemi

Mosayebi

Etemadi

et al. 2012

6th International Symposium on Telecommunications (IST)

Self Cite

View full text Add to dashboard Cite

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“…The problem of long and heavy computations has been tackled by Shahbazi et al [Shahbazi et al, 2009], and Boloursaz et al [Boloursaz et al, 2013], who simplified the codebook construction by limiting the search to signals from the TIMIT speech database [Zue et al, 1990]. Parallelly, Kazemi et al [Kazemi et al, 2015] proposed an exciting idea to exploit sphere packing techniques to construct waveforms with a large minimum distance and an improved detection rate.…”

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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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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“…The problem of long and heavy computations has been tackled by Shahbazi et al [18], and Boloursaz et al [19], who simplified the codebook construction by limiting the search to signals from the TIMIT speech database [20]. Parallelly, Kazemi et al [21] proposed a new idea to exploit sphere packing techniques to construct waveforms with a large minimum distance and an improved detection rate.…”

Section: Introductionmentioning

confidence: 99%

Introducing a Novel Data Over Voice Technique for Secure Voice Communication

Krasnowski¹,

Martin²,

Lebrun³

2022

Wireless Pers Commun

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The current increasing need for privacy-preserving voice communications is leading to new ideas for securing voice transmission. This paper refers to a relatively new concept of sending encrypted data or speech as pseudo-speech in the audio domain over existing voice communication infrastructures, like 3G cellular network and Voice over IP (VoIP). The distinctive characteristic of such a communication system is that it relies on the robust transmission of binary information in the form of audio signal. This work presents a novel Data over Voice (DoV) technique based on codebooks of short harmonic waveforms. The technique provides a sufficiently fast and reliable data rate over cellular networks and many VoIP applications. The new method relies on general principles of Linear Predictive Coding for voice compression (LPC voice coding) and is more versatile compared to solutions trained on exact channel models. The technique gives by design a high control over the desired rate of transmission and provides robustness to channel distortion. In addition, an efficient codebook design approach inspired by quaternary error correcting codes is proposed. The usability of the proposed DoV technique for secure voice communication over cellular networks and VoIP has been successfully validated by empirical experiments. The paper details the system parameters, putting a special emphasis on system's security and technical challenges.

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A data modem for GSM Adaptive Multi Rate voice channel

Cited by 12 publications

References 6 publications

A lower capacity bound of secure end to end data transmission via GSM network

A lower capacity bound of secure end to end data transmission via GSM network

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

Introducing a Novel Data Over Voice Technique for Secure Voice Communication

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