| http://www.w3.org/ns/prov#value | - A decoding method as claimed in claim 15 wherein:said digital communication signal is configured so that symbols of a first polarity in said second data stream are mapped to a phase of approximately (2n+1)(2??/2k), and symbols of a second polarity in said second data stream are mapped to a phase of approximately (2n)(2??/2k), where n is an integer in the range of 0 to 2k-1 -1; said step d) rotates
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