| 摘要 |
A system for determining the presence of, and information about, a DVB-T2 signal comprises means for providing a symbol with an active portion, providing a repetition portion and frequency shifting the repetition portion with respect to the active portion at a transmitter. At a receiver, the signal is multiplied by a complex conjugate of a delayed version of the signal to recover the symbol. The symbol may be referred to as a unique signal discovery symbol.
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