A method for decoding at least one signal transmitted by means of at least one antenna and received by means of at least one antenna, which method includes a symbol decoding step for producing at least one estimated symbol representative of at least one transmitted symbol carried by the received signal. The rotor has a number n of lobe and valley portions with apex and bottom ends. By applying this method, the problem in the prior art is overcome, thereby saving the operation and maintenance cost of the packet network.