Overlay communication in ofdm-based networks

A communication method to be performed by a secondary transceiver, the secondary transceiver being collocated in terms of operating frequency with a primary transceiver, the primary transceiver being configured to transmit at a predetermined band an orthogonal frequency division multiplexing (OFDM) signal that has a plurality of consecutive OFDM symbols, each of the OFDM symbols having a fixed OFDM symbol length and including a cyclic prefix that has a fixed prefix length, said communication method comprising steps of:

• A) upon receipt of the OFDM signal, determining a starting position of the cyclic prefix of one of the OFDM symbols of the OFDM signal;
• and
• B) transmitting a to-be-transmitted signal during a time corresponding to the cyclic prefix of said one of the OFDM symbols or another one of the OFDM symbols subsequent to said one of the OFDM symbols.