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HD Voice Modem for End to End Secure Call

HD Voice Modem for End to End Secure Call. PhD Candidate Sebastian Ciornei, Prof. Dr. Ion Bogdan, Assist. Prof. Dr. Luminita Scripcariu “ Gh . Asachi ” Technical University of Iasi, Romania. Outline. Motivation and Objectives Related work Solution design Methods and technologies used

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HD Voice Modem for End to End Secure Call

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  1. HD Voice Modem for End to End Secure Call PhD Candidate Sebastian Ciornei, Prof. Dr. Ion Bogdan, Assist. Prof. Dr. Luminita Scripcariu “Gh. Asachi” Technical University of Iasi, Romania

  2. Outline • Motivation and Objectives • Related work • Solution design • Methods and technologies used • Simulation Results • Conclusions • Acknowledgements • Future work

  3. Motivation Need for: • An ubiquitous data connection providing a voice communication between the peers • An end to end secure voice call solution on non-trusted networks (local, cross-border) • A low lag solution, independent of a data connection • A solution that takes technology advances into consideration (HDVoice)

  4. Objectives • End to End secure channel for voice/data: • Target bandwidth: 1200 bps to 2000 bps • Low Delay solution • Realistic & open implementation • Solution deployable on smart phones • Operator future proof

  5. Related work • Current solutions over data channels: • Relay on data connections • Lag is the major impediment • Existing solutions over voice (e.g. GSM): • Proprietary codecs and modulations • Add ~135 ms delay • Some add high complexity

  6. Solution Design

  7. Methods and Technologies Used • Modulations tested: AFSK, PSK, OOK • AMRWB acceptable rates from 18050 to 23850 bps • Speech Codec used: Codec2 (David Rowe) • AMRWB encoder/decoders by FFMpeg, VisualOn, OpenCORE. • FEC used in simulations: RS (15,9) • Simulations have been done integrating Matlab with external libraries codecs via Cygwin.

  8. Sample of transmitted and recovered signal

  9. Delay evaluation in various networks

  10. BER

  11. Conclusions • It is possible to implement a fully open solution for transmitting secured voice/data over mobile networks’ HDVoice audio channels • Latency introduced is within the acceptable range for LTE and HSPA/HSPA+ • Quality of the voice (MOS) is similar or even better than MELPe

  12. Acknowledgements The authors would like to thank to: • Dr. David Rowe for providing the open and freely available Codec2 and for his technical advices • The open source communities of: • FFMpeg, • VisualOn, • OpenCORE • Cygwin.

  13. Future work • Improve the higher bit rate • Check different modulations • Make reliable connections on even lower AMRWB bitrate

  14. Q&A

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