Receiving method and receiving apparatus

摘要

All data symbols used in data transmission of a modulated signal are precoded by switching between precoding matrices so that the precoding matrix used to precode each data symbol and the precoding matrices used to precode data symbols that are adjacent to the data symbol along the frequency axis and the time axis all differ. A modulated signal with such data symbols arranged therein is transmitted.

主权项

1. 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 equationF⁡[i]=1α2+1⁢(ⅇj⁢⁢θ11⁡(i)α×ⅇj⁢⁢(θ11⁡(i)+λ)α×ⅇj⁢⁢θ21⁡(i)ⅇj⁢⁢(θ21⁡(i)+λ+π)) where λ represents an arbitrary angle, and α represents a positive real number, and θ11(i) and θ21(i) in the matrix F[i] satisfy one of equationsⅇj⁢⁢(θ11⁡(x+1)-θ21⁡(x+1))ⅇj⁢⁢(θ11⁡(x)-θ21⁡(x))=ⅇj⁢⁢(2⁢⁢πN)⁢⁢for⁢⁢∀x⁡(x=0,1,2,…⁢,N-2)andⅇj⁢⁢(θ11⁡(x+1)-θ21⁡(x+1))ⅇj⁢⁢(θ11⁡(x)-θ21⁡(x))=ⅇj⁢⁢(-2⁢⁢πN)⁢⁢for⁢⁢∀x⁡(x=0,1,2,…⁢,N-2).