Patent ID: 8755478

Claim:
A reception method comprising: acquiring a reception signal by obtaining a first transmission signal z1 and a second transmission signal z2 respectively transmitted from a first antenna and a second antenna at a same time at a same frequency, the first transmission signal z1 and the second transmission signal z2 being respectively generated by performing predetermined generation process on a first modulated signal s1 and a second modulated signal s2 that are each generated from an encoding block using a predetermined error correction block encoding method; acquiring a reception quality information of the acquired reception signal; displaying the acquired reception quality information; and performing demodulation on the acquired reception signal according to the generation process to generate reception data, wherein the generation process includes: selecting a matrix F[i] from among N matrices while switching between the N matrices, for each of a plurality of slots, the N matrices each defining precoding performed on a plurality of modulated signals, i being an integer from 0 to N−1, and N being an integer 3 or greater; and performing precoding defined by the selected matrix F[i] on each of the first modulated signal s1 and the second modulated signal s2 to generate the first transmission signal z1 and the second transmission signal z2, the first transmission signal z1 and the second transmission signal z2 satisfy an equation (z1,z2) T =F[i](s1,s2) T , the N matrices satisfy an equation F ⁡ [ i ] = 1 α 2 + 1 ⁢ ( ⅇ j ⁢ ⁢ θ 11 ⁡ ( i ) α × ⅇ j ⁢ ⁢ ( θ 11 ⁡ ( i ) + λ ) α × ⅇ j ⁢ ⁢ θ 21 ⁡ ( i ) ⅇ j ⁢ ⁢ ( θ 21 ⁡ ( i ) + λ + π ) ) where λ represents an arbitrary angle, and α represents a positive real number, and θ 11 (i) and θ 21 (i) in the matrix F[i] satisfy one of equations ⅇ j ⁢ ⁢ ( θ 11 ⁡ ( x + 1 ) - θ 21 ⁡ ( x + 1 ) ) ⅇ j ⁢ ⁢ ( θ 11 ⁡ ( x ) - θ 21 ⁡ ( x ) ) = ⅇ j ⁢ ⁢ ( 2 ⁢ ⁢ π N ) ⁢ ⁢ for ⁢ ⁢ ∀ x ⁡ ( x = 0 , 1 , 2 , … ⁢ , N - 2 ) and ⅇ j ⁢ ⁢ ( θ 11 ⁡ ( x + 1 ) - θ 21 ⁡ ( x + 1 ) ) ⅇ j ⁢ ⁢ ( θ 11 ⁡ ( x ) - θ 21 ⁡ ( x ) ) = ⅇ j ⁢ ⁢ ( - 2 ⁢ ⁢ π N ) ⁢ ⁢ for ⁢ ⁢ ∀ x ⁡ ( x = 0 , 1 , 2 , … ⁢ , N - 2 ) .