I’m designing a CDMA system with a spreading factor of 20. I recently wrote an
app to go through all the binary permutations up to 2^20 and report which ones
have an equal number of 0’s and 1’s, or at least differ by only one. It came up
with so many “hits” that I have to wonder if they're really orthogonal. Does
anyone know offhand how many good spreading codes I can realistically expect
from 1048576 possible entries?
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