| http://www.w3.org/ns/prov#value | - modulator, modulating first carriers by a first data stream according to an m-level PSK or an m-level QAM to produce first modulated carriers, and modulating second carriers by a second data stream according to an n-level PSK or an n-level QAM to produce second modulated carriers, wherein adjacent two carriers of the first and second carriers are quadrate with each other, and wherein n is an integ
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