Patent ID: 7885175

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: symbol generating means for generating said data symbols and said pilot symbols, means for transmitting 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 generating means 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 in a frequency dimension contains at least said first type pilot symbol to be transmitted by using a predefined subcarrier and second type pilot symbol to be transmitted by using another predefined subcarrier, wherein said first pilot symbol pattern to be transmitted by using one of said plurality of transmission antennas has a different pattern 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 a same time allocation and being alternately identical and orthogonal to each other.