Patent ID: 8310915
Filing Date: 2012-11-13
Classification: H04L

Abstract:
1. A method of transmitting orthogonal frequency division multiplexing (OFDM) signals from a plurality of transmitters, comprising: allocating first pilot signals, second pilot signals, first data signals, and second data signals to first pilot subcarriers, second pilot subcarriers, first data subcarriers, and second data subcarriers, respectively, the first data signals being identical between the transmitters; allocating the first pilot subcarriers and the first data subcarriers to subcarriers included in each subcarrier group of subcarrier groups, each subcarrier group including at least one pilot subcarrier, data signals transmitted via the subcarriers included in each subcarrier group being identical between the transmitters; multiplying at least one first pilot signal and first data signals included in one subcarrier group by one of complex numbers for the subcarrier groups to obtain a multiplied first pilot signal and multiplied first data signals, wherein plural complex numbers are set for each respective subcarrier group and for each respective transmitter; generating an OFDM signal by performing OFDM modulation on the multiplied first pilot signal and the multiplied first data signals and the second pilot signals and the second data signals; and transmitting the OFDM signal, wherein the multiplied first pilot signal, the second pilot signals, the multiplied first data signals, and the second data signals are transmitted by multiple antennas of a plurality of transmitters, each transmitter being part of a multi-diversity system in which each transmitter includes at least one antenna, the subcarrier groups are identical among the transmitters.