Patent ID: 7567625
Filing Date: 2009-07-28
Classification: H04L

Abstract:
1. A method of allocating sub-carriers to at least one user equipment and mapping the allocated sub-carriers with transmit antennas in a multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDMA) mobile communication system, the method comprising the steps of: receiving channel information relating to the sub-carriers and the transmit antennas from a plurality of user equipments; determining a number of the sub-carriers to be allocated to each user equipment based on the channel information; and allocating, in a sub-carrier allocator of the MIMO OFDMA mobile communication system, each of the sub-carriers to each user equipment and mapping the allocated sub-carriers to the transmit antennas according to the channel information and the number of sub-carriers; wherein, if a sum of the sub-carriers allocated to each user equipment exceeds a total number of sub-carriers, a number of sub-carriers allocated to a user equipment which has a least gap difference between its new total energy calculated when the number of sub-carriers is reduced by one and its current total energy is reduced.