Patent ID: 8842772

Claim:
A method for generating a plurality of signals and transmitting the plurality of signals from a plurality of antennas in the same frequency at the same time, generation of the plurality of signals comprising: selecting one matrix from among N matrices F[i], wherein i is an integer no less than 0 and no more than N−1, and N is an integer 3 or greater, by hopping between the matrices over each of a plurality of slots, the N matrices F[i] defining a precoding process that is performed on a plurality of baseband signals; and generating a first precoded signal z 1 and a second precoded signal z 2 by performing a precoding process, which corresponds to the matrix selected from among the N matrices F[i], over each of the plurality of slots on a first baseband signal s 1 generated from a first set of bits and a second baseband signal s 2 generated from a second set of bits, the first precoded signal z 1 and the second precoded signal z 2 satisfying (z 1 , z 2 ) T =F[i] (s 1 , s 2 ) T , the N matrices F[i] being expressed as: F ⁡ [ i ] = 1 α 2 + 1 ⁢ ( ⅇ jθ 11 ⁡ ( i ) α × ⅇ j ⁡ ( θ 11 ⁡ ( i ) + λ ) α × ⅇ jθ 21 ⁡ ( i ) ⅇ j ⁡ ( θ 21 ⁡ ( i ) + λ + π ) ) λ representing an arbitrary angle, α representing a positive real number excluding 1, θ 11 (i) and θ 21 (i) satisfying: e j(θ 11 (x)−θ 21 (x)) ≠e j(θ 11 (y)−θ 21 (y)) wherein x and y are any integers no less than 0 and no more than N−1 satisfying x≠y, each of the N matrices being selected at least once in a predetermined number of slots, the first precoded signal z 1 and the second precoded signal z 2 being transmitted from a first antenna and a second antenna respectively in the same frequency at the same time, and the first set of bits and the second set of bits used in one slot not being used in another slot.