Patent ID: 6862451

Claim:
A cellular radiotelephone signal, comprising a main symmetrical bidirectional channel, including a main uplink and a main downlink, providing in particular low or medium speed transmission of signaling and control data and information, wherein said signal includes at lest one additional channel solely assigned to downlink, with no corresponding symmetrical uplink channel, providing in particular high speed data transmission wherein said additional channel implements a multi-carrier technology providing distribution of data in the time frequency space, wherein said additional channel has a complex envelope responding to the following equation: x ⁡ ( t ) = ∑ m , n ⁢ a m , n ⁢ i m + n ⁢ ⁢ ( t - nT ) ⁢ ⅇ ⅈ ⁢ ⁢ π ⁢ ⁢ n ⁢ ⁢ t / T where: m is an integer representing the frequential dimension; n is an integer representing the temporal dimension; t represents time; T is the time symbol; a m,n is a real digital coefficient chosen from a pre-set alphabet; ℑis the prototype IOTA function, which is a function identical to its Fourier Transform.