Patent ID: 8654747

Claim:
A base station for communicating with a first user equipment terminal within a first system band and communicating with a second user equipment terminal within a second system band, comprising: a first reference signal sequence generating unit configured to generate a first to M-th reference signal sequences; a second reference signal sequence generating unit configured to generate a first to (2*M)-th reference signal sequences; a scheduling unit configured to allocate one or more resource blocks including a predetermined number of subcarriers over successive first and second time slots to each of the first user equipment terminal and the second user equipment terminal; a signal multiplexing unit configured to multiplex the first to M-th reference signal sequences into a first resource block to be allocated to the first user equipment terminal and multiplex the first to (2*M)-th reference signal sequences into a second resource block to be allocated to the second user equipment terminal; and a transmitting unit configured to transmit signals including the first resource block and the second resource block, wherein an arrangement in the first time slot within the first resource block of the first through M-th reference signal sequences defined by OFDM symbols and subcarriers is equal to an arrangement in the first time slot within the second resource block of the first to M-th reference signal sequences defined by OFDM symbols and subcarriers, and an arrangement in the second time slot within the first resource block of the first through M-th reference signal sequences defined by OFDM symbols and subcarriers is equal to an arrangement in the second time slot within the second resource block of the (M+1)-th to (2*M)-th reference signal sequences defined by OFDM symbols and subcarriers.