Patent ID: 8804637
Filing Date: 2014-08-12
Classification: H04B,H04L

Abstract:
1. A method for transmitting multiple input multiple output (MIMO) midambles in a radio communication system, the method comprising: allocating a radio resource of a carrier for the MIMO midambles of multiple antennas; and transmitting, from a base station to a mobile station, the MIMO midambles through the multiple antennas by using the allocated radio resource, wherein the MIMO midambles includes sequences for distinguishing each of the multiple antennas such that the mobile station estimates a channel state for each of the multiple antennas, wherein the carrier includes a plurality of resource units, each of which includes a plurality of subcarriers in a frequency domain and a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a time domain, wherein a resource element is defined as one subcarrier in the frequency domain and one OFDM symbol in the time domain, wherein the carrier includes a used band including subcarriers allocated for transmitting a signal and a guard band including subcarriers allocated for preventing interference from occurring in the used band, and the MIMO midambles are allocated within the guard band, and wherein the MIMO midambles are allocated to resource elements within the guard band, except for resource elements used for transmitting pilot signals for a channel estimation.