Patent ID: 8165240

Claim:
A method for transmitting signals in a system using a plurality of antennas, the method comprising: multi-antenna-encoding a plurality of data symbols to form a plurality of transmitting symbol groups each of which corresponds to an antenna among the plurality of antennas and has a plurality of transmitting symbols generated from the plurality of data symbols; and transmitting each of the plurality of transmitting symbol groups through a corresponding antenna among the plurality of antennas using a group of time-frequency resources, wherein at least two antennas among the plurality of antennas transmit transmitting symbols generated from a same data symbol on a same time-frequency resource in the group of time-frequency resources, wherein a number of the plurality of antennas is 4, and transmitting symbols transmitted through each of the 4 antennas using two time-frequency resources in the group of time-frequency resources are represented by a first matrix as follows: [ ⁢ α ⁢ ⁢ s 1 ⁢ ⁢ β ⁢ ⁢ s 2 ⁢ ⁢ γ ⁢ ⁢ s 2 ⁢ ⁢ ξ ⁢ ⁢ s 2 ⁢ ⁢ - γ * ⁢ s 2 * ⁢ - ξ * ⁢ s 2 * ⁢ ⁢ α ⁢ ⁢ s 1 * ⁢ ⁢ β ⁢ ⁢ s 1 * ⁢ ] , wherein each row of the first matrix represents a time-frequency resource and each column of the first matrix represents an antenna, and each element of the first matrix represents a transmitting symbol transmitted through i-th antenna (i=1, 2, 3, 4) using j-th time-frequency resource (j=1, 2), where s 1 and s 2 are data symbols and α, β, γ and ξ are complex number parameters other than zero to make an inner product of a first row vector of the first matrix and a second row vector of the first matrix become zero.