Signal transmission method and signal reception method of heterogeneous systems sharing frequency band

A signal reception method performed by a receiver of a target communication system sharing a frequency band of a general communication system in an underlay form, the signal reception method comprising:

• determining an estimate for a transmission signal of a time domain from a reception signal;
• deriving a delay-time (DT) matrix comprising samples of a DT domain from the estimate for the transmission signal of the time domain;
• applying a Wigner transform to the DT matrix and deriving a frequency-time (FT) matrix comprising samples of an FT domain from the DT matrix;
• compensating a channel of the FT matrix by using a variance matrix of primary user signals transmitted and received through the general communication system;
• and
• applying a symplectic finite Fourier transform (SFFT) to the FT matrix of which the channel is compensated and extracting information symbols of a delay-Doppler (DD) domain,
• wherein
• the determining comprises using a covariance matrix of primary user signals transmitted and received through the general communication system and determining the estimate for the transmission signal of the time domain.

A signal reception method performed by a receiver of a target communication system sharing a frequency band of a general communication system in an underlay form, the signal reception method comprising:

• determining an estimate for a transmission signal of a time domain from a reception signal;
• applying a Wigner transform to the estimate for the transmission signal of the time domain and deriving a frequency-time (FT) matrix comprising samples of an FT domain from the transmission signal of the time domain;
• compensating a channel of the FT matrix by using a variance matrix of primary user signals transmitted and received through the general communication system;
• and
• applying a symplectic finite Fourier transform (SFFT) to the FT matrix of which the channel is compensated and extracting information symbols of a delay-Doppler (DD) domain.