Patent ID: 8693563

Claim:
A transmitter for transmitting an orthogonal frequency division multiplexing (OFDM) signal using multiple antennas, comprising: a subgroup generator configured to divide data symbols of a frequency domain into a plurality of subgroups; an inverse fast Fourier transform (IFFT) unit configured to perform an IFFT with respect to each of the subgroups so as to generate partial signals of a time domain corresponding to the plurality of subgroups, respectively; a candidate OFDM signal generator configured to generate at least two candidate OFDM signals using a combination of the partial signals so that each of the partial signals is transmitted to one of transmit antennas; and a selector configured to select one of the at least two candidate OFDM wherein the at least two candidate OFDM signals satisfy the following equation: s j ( m ) = ∑ p = 0 P - 1 ⁢ ⁢ i j , p ( m ) ⁢ x ~ p , where s j (m) denotes a j th antenna signal of an m th candidate OFDM signal for P subgroups, i j,p (m) subject to ∑ j = 0 n t - 1 ⁢ ⁢ i j , p ( m ) = 1 denotes an indicator, and {tilde over (x)} p denotes a partial signal of the p th subgroup, where n t denotes a number of antennas.