Marc Lichtman

At the end of the chapter add a full python simulation showing reading some input data (eg an ASCII message), generate QPSK, simulate a channel, receive/demod/decode the ASCII, and compute...

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Closes #321

Normalize the string -> obj pairs

4

eg START_INDEX_KEY should probably be renamed to CORE_SAMPLE_START, along with all the others that clearly dont match

Interesting choice of name considering [PySDR](https://pysdr.org/) is already a thing within the ham community (it's a free online textbook that many folks use as an intro to RF DSP), it's...