Citation
Abstract
This article analyzes the effect of a noisy reference carrier on the performance of International Comet Explorer (ICE) Sequential decoder. Ideal reference models for frame deletion probability are given for the Telemetry Processing Assembly (TPA) and the Linkabit (LS4815) sequential decoders. Based on these ideal reference models the deletion probability in the presence of noisy reference carrier is computed for both the high and the low data rate cases. A medium data rate performance model is then derived using an interpolation method. The derived medium rate performance model depends on the phase locked loop bandwidth-integration time product. Results are obtained for frame length of 1024 bits, data bit rates of 1024 bps and 512 bps, modulation index of 60°, and threshold loop bandwidths of 10 Hz and 3 Hz. The medium rate model agrees with experimental data to within measurement uncertainty. For the 10 Hz loop bandwidth and modulation index of 60° at frame deletion rate of 107%, the required total received power to noise ratio is 36 dB. The analysis given in this article is general and applicable to any sequential decoder, provided that the ideal reference model of the decoder is available.
Details
- Volume
- 42-82
- Published
- August 15, 1985
- Pages
- 82–91
- File Size
- 350.1 KB