Patent ID: 8559536

Claim:
A transmitter having first to M th transmitting antennas, where M is an integer equal to or greater than 2, and for transmitting an OFDM signal obtained by modulating a plurality of carriers per symbol duration, the OFDM signal containing pilot signals scattered on a carrier-symbol plane, on the carrier-symbol plane, k denoting a carrier number, n denoting a symbol number, Δk denoting an interval between pilot signals in a same symbol, Δn denoting an interval between pilot signals in a same carrier, and p denoting an integer greater than or equal to 0, n S and k S each denoting a nonzero integer, and m denoting an integer satisfying 1≦m≦M, when 2≦m≦M, neither (m−1)n s nor (m−1)k s being equal to an integral multiple of M, the carrier number k P (n) of a carrier that transmits a pilot signal in a symbol with the symbol number n satisfying Equation 1, k P ⁡ ( n ) = Δ ⁢ ⁢ k Δ ⁢ ⁢ n × ( n ⁢ mod ⁢ ⁢ Δ ⁢ ⁢ n ) + Δ ⁢ k × p , [ Equation ⁢ ⁢ 1 ] the transmitter comprising: a generating unit operable to generate the pilot signals as m th pilot signals for an m th antenna, where 1≦m≦M, such that a phase difference between a phase of each m th pilot signal and a phase of a reference pilot signal is equal to a value given by Equation 2, j ⁢ ⁢ 2 ⁢ π ⁡ [ ( m - 1 ) ⁢ n s M ⁢ ⁢ Δ ⁢ ⁢ n ⁢ n - ( m - 1 ) ⁢ k s M ⁢ ⁢ Δ ⁢ ⁢ k ⁢ k ] ; [ Equation ⁢ ⁢ 2 ] a transmitting unit operable to transmit, from the m th transmitting antenna, the OFDM signal containing the m th pilot signals generated by the generating unit.