SIGNAL GENERATION METHOD AND SIGNAL GENERATION DEVICE

摘要

A transmission method simultaneously transmitting a first modulated signal and a second modulated signal at a common frequency performs precoding on both signals using a fixed precoding matrix and regularly changes the phase of at least one of the signals, thereby improving received data signal quality for a reception device.

主权项

1. A transmission method comprising:
generating a coded block made up of a plurality of bits by using a predetermined error correction block coding scheme; generating, for each of a plurality of slots, a first transmission signal z1 and a second transmission signal z2 from the coded block; and transmitting the first transmission signal z1 and the second transmission signal z2 respectively from a first antenna and a second antenna at the same time at the same frequency, the transmission signal generation including:
generating, for each of the plurality of slots, a first modulated signal s1 and a second modulated signal s2 from the coded block;with respect to the first modulated signal s1 and the second modulated signal s2, applying precoding expressed by a fixed matrix F and performing a phase change while regularly varying a scheme of phase change for each of the plurality of slots, the matrix F being expressed as:F=1α2+1(j0α×j0α×j0jπ) in the coding, a first coded block and a second coded block different from the first coded block being generated as the coded block, and a scheme of phase change selected for the first slot in the transmission signal generation targeted for the first coded block being the same as a scheme of phase change selected for the first slot in the transmission signal generation targeted for the second coded block.