Patent ID: 8483039

Claim:
A transmitting device for transmitting data symbols and pilot symbols in an OFDM transmission system having a plurality of transmission antennas, the device comprising: a symbol generator that generates said data symbols and said pilot symbols; and a transmitter that transmits said data symbols and pilot symbols respectively by using a plurality of subcarriers of said OFDM transmission system via said plurality of transmission antennas, wherein said symbol generator generates a first type pilot symbol and a second type pilot symbol having an inverted value of said first type pilot symbol so that a first pilot symbol pattern to be transmitted by using one of said plurality of transmission antennas has a different pattern in the frequency and time dimension from a second pilot symbol pattern to be transmitted by using another transmission antenna, and wherein first pilot symbols are comprised in said first pilot symbol pattern and second pilot symbols are comprised in said second pilot symbol pattern, at least some of the first and second pilot symbols having the same time allocation and being alternately identical and inverted to each other.