METHOD OF RECEIVING OFDM SIGNALS Russian patent published in 2020 - IPC H04L27/148 

FIELD: radio equipment.

SUBSTANCE: invention relates to wire, satellite and ground radio communication and can be used for orthogonal frequency division multiplexing (OFDM) transmission systems. Method of receiving OFDM signals is based on separate subband processing of the low-frequency and high-frequency bands of the received signal s(t) in real time. Current value of the fragment of the low-frequency component of the received signal is determined as the difference between the fragment of the received signal and the display of the s*_H(t) high-frequency band of the signal formed by spectral analysis of this fragment. Low-frequency symbol band display s*_L(t)=s(t) – s*_H(t) on the current time interval [0, t] is compared to the basis of the synthesized B=M^L low-frequency reference signals s*_Lb(t) (M is the dimension of the signal constellation, L is the number of low-frequency subcarriers, b= 1, 2, …, B), and based on the comparison results at the end of recognition t=t_p≤To, a reference signal with the shape of the compared fragment closest to the shape of the low-frequency signal display fragment is selected, and the sum of the high-frequency component display and the selected low-frequency reference signal is received as the recognized symbol. Control evaluation of results of comparison of fragments with increase in one current count of the interval [0, t_p+Δt] of recognition of the received symbol is repeated until the same symbol is selected as the recognized one for at least twice in a row. After recognition of a symbol via a return channel, a recognition receipt is transmitted, from which a decision is made on completion of transmission over the forward channel of the current symbol, formation of the next symbol and beginning of its transmission along a direct channel taking into account the current signal-interference environment.

EFFECT: technical result consists in increase in throughput capacity of a radio channel due to recognition of transmitted symbols before completion of their transmission.

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