FIELD: transmitting information.
SUBSTANCE: systems for transmitting information over a radio channel. Invention can be used in the construction of command radio control links (CCRL) operating with OFDM signals. The technical result of the invention is the possibility of a single execution of a full processing cycle of the received OFDM signal taken at any time in the interval of the cyclic prefix (CP) Tcp, while ensuring the correct decoding of the CC in the presence of a multiple and fractional frequency shift, as well as reducing the required number of operations performed DFT, which makes it possible to implement OFDM switchgear in a portable version using low-power microprocessors while ensuring high system noise immunity, which can be achieved by receiving phase-shift keyed signals without synchronization. In a device for receiving and transmitting phase shift keying signals in a command radio control link using OFDM technology, configured to operate in an economy mode, 1) a control command (CC) transmitted in the form of an OFDM symbol with a duration of Tk is supplemented with a cyclic prefix with a duration of Tcp, which provides single acquisition and processing of CC with duration Tc at any time in the Tcp interval, 2) correction of the received OFDM symbol, due to a possible time shift in the Tcp interval, is eliminated by multiplying the signal by a set of complex exponentials 
with frequencies 
, where N is equal to the number of subcarriers in the OFDM symbol, 3) in the decoder, the received OFDM symbol is analyzed for the presence of the transmitted CC in it, taking into account all possible time and frequency shifts.
EFFECT: possibility of a single execution of a full processing cycle of the received OFDM signal taken at any time in the interval of the cyclic prefix (CP) Tcp, while ensuring the correct decoding of the CC in the presence of a multiple and fractional frequency shift, as well as reducing the required number of operations performed DFT, which makes it possible to implement OFDM switchgear in a portable version using low-power microprocessors while ensuring high system noise immunity, which can be achieved by receiving phase-shift keyed signals without synchronization.
1 cl, 4 dwg
