Orthogonal

In communications, two signals are orthogonal if one can be decoded without interference from the other. There’s no such thing as a free lunch, so often complicated rules have to be used to make sure the two signals remain orthogonal. For example in CDMA, signals are only orthogonal if they are chosen from a limited set of code sequences with the right properties. Generating and managing the limited set of codes can be a real headache.

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