Citation
Abstract
This report describes results of telemetry system performance testing conducted at Goddard Merritt Island Space Flight Station using DSN equipment and a Maximum Likelihood Convolutional Decoder (MCD) for code rates 1/2 and 1/3, constraint length 7 and special test software. The test results confirm the superiority of the rate 1/3 over that of the rate 1/2. The overall system performance losses determined at the output of the Symbol Synchronizer Assembly are less than 0.5 dB for both code rates. Comparison of the performance is also made with existing mathematical models. Error statistics of the decoded data are examined. The MCD operational threshold is found to be about 1.96 ab.
Details
- Volume
- 42-42
- Published
- December 15, 1977
- Pages
- 149–161
- File Size
- 835.4 KB