Browsing International Telemetering Conference Proceedings, Volume 40 (2004) by Authors
Analysis of Optimized Design Tradeoffs in Application of Wavelet Algorithms to Video CompressionWanis, Paul; Fairbanks, John S.; L-3 Communications Corporation (International Foundation for Telemetering, 2004-10)Because all video compression schemes introduce artifacts into the compressed video images, degradation occurs. These artifacts, generated by a wavelet-based compression scheme, will vary with the compression ratio and input imagery, but do show some consistent patterns across applications. There are a number of design trade-offs that can be made to mitigate the effect of these artifacts. By understanding the artifacts introduced by video compression and being able to anticipate the amount of image degradation, the video compression can be configured in a manner optimal to the application under consideration in telemetry.
Challenges of Optimizing Multiple Modulation Schemes in Transponder DesignFairbanks, John S.; L-3 Communications, Inc. (International Foundation for Telemetering, 2004-10)Increasing gate counts in FPGA’s create an option of offering multiple waveform demodulation and modulation within a single transponder transceiver. Differing data rates, channel schemes, and network protocols can be addressed with the flexibility of software-based demodulation and modulation. Increased satellite longevity and reliability are benefits of software-based transceiver design. Newer packaging technology offers additional capability in reducing form factor and weight of a transponder. A review of the challenges in combining each of the above to produce the next generation of transponders is the subject of this paper.