FIELD: radio engineering, communication.
SUBSTANCE: OFDM transmitter and OFDM receiver respectively transmit and receive N (N≥2, N is an integer) control symbols. For each control symbol, a guard interval time-domain signal is, for example, identical to a signal obtained by frequency-shifting at least a portion of a useful symbol time-domain signal by a value different from any other symbol, or to a signal obtained by frequency-shifting one or both of a portion and a span of a useful symbol interval time-domain signal different from any other symbol by a predetermined value.
EFFECT: generating multiple control symbols such that demodulation thereof is accurately possible in a delayed environment.
5 cl, 82 dwg
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