Patent ID: 7221645

Claim:
A transmitting device for transmitting signals in a wireless orthogonal frequency division multiplex (OFDM) communication system with multiple transmission antennas, comprising: first and a second antenna means for transmitting data of a first and a second data stream, respectively, in OFDM signals; and pilot symbol generating means for generating first and second pilot symbols to be transmitted among said data of said first and second data stream, wherein said first pilot symbols are transmitted via said first antenna and said second pilot symbols are transmitted via said second antenna, wherein said first and said second pilot symbols correspond to one another and have the same frequency and time allocation and a regular distribution in the time and frequency dimension in the OFDM system, and wherein at least some pairs of said first pilot symbols adjacent in the frequency dimension are respectively orthogonal to corresponding pairs of said second pilot symbols and at least some pairs of said first pilot symbols adjacent in the time dimension are respectively orthogonal to the corresponding pairs of said second pilot symbols.