NDLI: An adaptive-rate anti-jam system for optimal voice communication

Content Provider	IEEE Xplore Digital Library
Author	Kleider, J.E. Campbell, W.I.
Copyright Year	1997
Description	Author affiliation: Motorola Inc., Scottsdale, AZ, USA (Kleider, J.E.)
Abstract	Systems for the digital transmission of voice have traditionally been fixed rate in anti-jam situations. This design severely limits the potential of the communication system in the case of voice since compression of speech is a lossy process. Bit errors in the transmission of voice coded speech cause degradation which can be compensated for in several ways. The standard method is to trade off channel coding and source coding bit rates to achieve an accepted level of quality in a fixed rate system. We present a method that provides optimal voice quality and intelligibility for any given transmission channel condition. The approach is performed via a fully adaptive-rate system using an adaptive-rate modem, channel coding, and a multimode voice coder. In general, the receiver utilizes channel state information to not only optimally demodulate and decode the currently corrupted symbols from the channel, but also to inform the transmitter, via a feedback channel, of the optimal strategy for voice/channel coding and modulation format. We compare several joint source-channel coding schemes at multiple transmission symbol rates and compare the performance to fixed aggregate-rate channel-controlled variable rate voice coding systems. We show through simulation that the reduction in speech distortion is greater for a modulation change than a channel coding change in many realistic situations because of the variability of coding gain.
Starting Page	1103
Ending Page	1107
File Size	432412
Page Count	5
File Format	PDF
ISBN	0780342496
DOI	10.1109/MILCOM.1997.644870
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-11-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Channel coding Speech processing Degradation Source coding Bit rate Modems Channel state information Decoding Transmitters State feedback
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

An adaptive-rate digital communication system for speech

An Adaptiverate Antijam System For Optimal Voice Communication (1997)

Adaptive Bit Loading for OFDM Systems with Imperfect Channel State Information

On the multiple-access channel with rate-limited state information at the encoders

Channel coding techniques for adaptive multi rate speech transmission

Data Transmission over GSM Adaptive Multi Rate Voice Channel Using Speech-Like Symbols

A sub-band coder designed for combined source and channel coding (speech coding)

Adaptive modulation for variable-rate OFDM systems with imperfect channel information

On the problem of channel mismatch in constant-bit-rate adaptive modulation for OFDM

An adaptive-rate anti-jam system for optimal voice communication

Similar Documents

An adaptive-rate digital communication system for speech

An Adaptiverate Antijam System For Optimal Voice Communication (1997)

Adaptive Bit Loading for OFDM Systems with Imperfect Channel State Information

On the multiple-access channel with rate-limited state information at the encoders

Channel coding techniques for adaptive multi rate speech transmission

Data Transmission over GSM Adaptive Multi Rate Voice Channel Using Speech-Like Symbols

A sub-band coder designed for combined source and channel coding (speech coding)

Adaptive modulation for variable-rate OFDM systems with imperfect channel information

On the problem of channel mismatch in constant-bit-rate adaptive modulation for OFDM

An adaptive-rate anti-jam system for optimal voice communication