NARROWBAND TECHNOLOGIES FOR TACTICAL COMMUNICATIONS

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Authors
  1. Boudreau, D.
  2. Jolly, Y.
  3. Benoit, P.
  4. Boucher, L.
Corporate Authors
Communications Research Centre, Ottawa ONT (CAN);Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
Over the last few decades, mobile radios have been designed for the transmission of uncompressed or slightly compressed voice signals, using frequency modulation in a 25 to 30 kHz channel bandwidth. As the technology evolves, there is a constant trend toward the use of digital voice and modulation methods, in order to reduce the required channel bandwidth and transmitted power for a given voice quality. The objective of this task was the development and the implementation of a state-of-the-art mobile digital narrowband radio. The ultimate aim is to reduce the use of system resources, such as the required channel bandwidth or the transmitted signal power, as well as the cost of the radio terminals, and to increase the quality of the voice transmission. In order to accommodate such conflicting requirements, sophisticated signal processing techniques are required in both the transmitter and the receiver. Such techniques include: combined source and channel coding, efficient adaptive equalization on fading channels, soft-output symbol detection and combined channel and source decoding. The design of a narrowband radio, making use of some of these advanced techniques, is presented in this report.
Keywords
Source and Channel Coding;Adaptive equalization;Soft Output Symbol Detection;Combine Source and Channel Coding
Report Number
CRC-95-005 — Technical Report (Final)
Date of publication
01 Jun 1996
Number of Pages
35
DSTKIM No
96-03300
CANDIS No
499874
Format(s):
Hardcopy;Document Image stored on Optical Disk

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