Patent ID: 7936740

Claim:
A radio transmission method comprising: (a) coding transmission data to a plurality of time-space codes; (b) generating spread signals by respectively mapping a plurality of spread codes and the time-space codes, each of the spread codes containing a combination of codes whose signs are alternately equal and opposite for each of spread codes corresponding to different groups of a plurality of transmission antennae; and (c) transmitting the spread signals via the corresponding groups of the transmission antennae, wherein the signs of the codes in first and third partial spread segments of first spread codes corresponding to one group of the transmission antennae are the same as the signs of the codes in first and third partial spread segments of second spread codes corresponding to another group of the transmission antennae, and the signs of the codes in the second and fourth spread segments of the first spread codes are different from the signs of the codes in the second and fourth partial spread segments of the second spread codes.