Pre-coding method and pre-coding device

摘要

Disclosed is a precoding method comprising the steps of: generating a first coded block and a second coded block with use of a predetermined error correction block coding scheme; generating a first precoded signal z1 and a second precoded signal z2 by performing a precoding process, which corresponds to a matrix selected from among the N matrices F[i], on a first baseband signal s1 generated from the first coded block and a second baseband signal s2 generated from the second coded block, respectively; the first precoded signal z1 and the second precoded signal z2 satisfying (z1, z2)T=F[i] (s1, s2)T; and changing both of or one of a power of the first precoded signal z1 and a power of the second precoded signal z2, such that an average power of the first precoded signal z1 is less than an average power of the second precoded signal z2.

主权项

1. A transmission method comprising:
generating a first modulated signal s1 with use of a first modulation scheme; generating a second modulated signal s2 with use of a second modulation scheme, the second modulation scheme being lower in modulation level than the first modulation scheme; generating, for each transmission frame, a first precoded signal z1 and a second precoded signal z2 from the first modulated signal s1 and the second modulated signal s2 with use of a precoding matrix F[i] selected from among N precoding matrices,
where i is an integer no less than 0 and no more than N−1, and N is an integer 3 or greater,the first precoded signal z1 and the second precoded signal z2 satisfy (z1,z2)T=F[i](s1,s2)T,(s1,s2)T is a transpose of a vector (s1,s2), and(z1,z2)T is a transpose of a vector (z1,z2); and transmitting a first transmission signal that is based on the first precoded signal z1 and a second transmission signal that is based on the second precoded signal z2 at the same time at the same frequency, wherein a precoding matrix selected first in each transmission frame is a first precoding matrix.