Patent ID: 8040867

Claim:
A method of radio data emission, by an emitter including at least two transmit antennas, each antenna transmitting on at least an even number ‘N’, strictly greater than 2, of different frequencies, comprising: emitting, on a first antenna and during a given time slot on each frequency ‘k’, with k=0 to N−1, a signal representing a complex symbol ‘X k ’ in the frequency domain; and emitting, on a second antenna and during the same time slot, on each frequency ‘k’, with k=0 to N−1, a signal representing a symbol ‘Y k ’, wherein for each index ‘k’, with k=0 to N/2−1, symbols ‘Y k ’ and ‘Y k+N/2 ’ result from a space frequency block code applied to symbols ‘X k ’ and ‘X k+N/2 ’, ck being defined as equal to cos(2πk/N), sk being defined as equal to j sin(2πk/N), said space frequency block code being defined by a formula: Y k =ε(c k X k −s k X k+N/2 ), and Y k+N/2 =ε(−s k X k +c k X k+N/2 ), and ε is 1 or −1.