| http://www.w3.org/ns/prov#value | - The switch means 9 b interposes pilot symbols p0, p1, p2, p3 . . . generated in a pilot symbol generation means 9 c, which can be for example a memory, in between the data of the data stream, so that a pilot symbol is allocated and modulated on every n-th subcarrier generated in the succeeding modulation means 9 a.
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