NASA NTRS · 19930010240
Cascaded convolutional codes
Abstract
Due to the hardware design of Galileo's Command and Data Subsystem (CDS), the channel code usable in an S-band (2290-2300 MHz) mission must include the NASA standard (7,1/2) convolutional code. Galileo's hardware encoder for the (15,1/4) code is not usable in S-band mode. However, the need for higher coding gain dictates the use of long constraint length convolutional codes. Theoretical results show how a large subclass of such codes is realizable by using a software encoder in the CDS cascaded with the hardware encoder for the NASA standard code.
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Pollara, F., Divsalar, D.. 1992-08-15. Cascaded convolutional codes. https://ntrs.nasa.gov/citations/19930010240
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