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I have been having a hard time getting it straight in my mind exactly what Barker sequence coding is and how it “spreads” the data and exactly what processing gain is. While searching for the answer I found the following (link) which explained it very well.
As a bonus it describes a lot of the Physical and MAC layer topics that I have been studying.
If you have been digging through the IEEE specs. and need a different perspective on the same information you may want to check out this article by Benjamin E. Henty "http://www.ghz.cc/~henty/webtut.pdf"