Patent ID: 7477696

Claim:
A digital signal transmission system comprising: a space-time encoder receiving a flow of data to be transmitted d[i], encoding this data d[i] as symbol vectors m[k] of dimension P(P>1) and generating said symbol vectors m[k], and P modulator-transmitters { 2 P } (1≦p≦P) , each receiving one component m p [k] of the symbol vector m[k] output from the space-time encoder, applying the constellation of a predetermined modulation to said symbol m p [k] to obtain symbol a p [k], and converting the symbol obtained, a p [k], into a signal s p (t) transmitted on said antenna ( 24 p ) connected to said transmitter ( 2 p ) wherein the transmitters are adapted to transmit signals s(t) with time diversity, wherein P modulator-transmitters { 2 p }: each produce said symbol a p [k] in parallel at instant k, each form a filter of function h p (t) comprising a delay element τ ρ with τ 1 ≠τ 2 ≠ . . . τ ρ , such that h p (t)=h p (t−τ 92 ) for all values of p, such that the function h p (t) of the transmitter ( 2 p ) is different from those of the other transmitters { 2 q } (q≠p) : h 1 (t)≠h 2 (t)≠ . . . ≠h p [(t), each generate at their respective transmission antennas the signal s p [k] corresponding at least to the filtering by the function h p (t) of the symbols a p [k]; and wherein the digital signal transmission system further comprises a wave form h p , wherein h 1 ≠h 2 ≠ . . . ≠h P for all values of p wherein (1≦p≦P).