Field Expedient SDR: Basic Digital Communications by Paul Clark & David Clark

Author:Paul Clark & David Clark [Clark, Paul & Clark, David]
Language: eng
Format: epub
Tags: Technology & Engineering, Radio, Software Defined Radio
ISBN: 9781537324494
Google: vE8ivgAACAAJ
Publisher: CreateSpace Independent Publishing Platform
Published: 2016-03-14T23:00:00+00:00

The starting points of each payload are these preamble-completion markers. We’ll worry about the ending points of the payloads in the next step.

# split list based on 2s and 3s, which is where

# the preamble concludes

segmentList = []

tempSegment = []

for symbolByte in waveformData:

if (symbolByte == b’’) or (symbolByte == b’’):

# append accumulated segment to list

segmentList.append(tempSegment)

# start new temp segment with the bit

# underneath the preamble flag

if symbolByte == b’’:

tempSegment = [b’’]

else:

tempSegment = [b’
’]

else:

tempSegment.append(symbolByte)

This chunk of code is a bit longer. The goal is to create a list of segments, where the segments are themselves lists of bytes. We accomplish this by going though each byte in the waveform list and appending it to a temporary list. When we encounter a 2 or a 3 (since we’re working directly with binary values, we have to use the weird

b’’ notation), we append the temporary segment to a list of segments and start over accumulating a new segment. The first symbol in this new segment is the preamble marker with 2 subtracted (the fact that we’re working directly in binary values keeps us from simply subtracting two; instead we use a clumsier “if” statement).

For the third bullet point, we need to shorten each segment so it will contain only the bytes in the payload.

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