| 摘要 |
PROBLEM TO BE SOLVED: To calculate optimum transmit power for individual users, and reduce the associated computational complexity under the condition where respective transmit power levels of different transmit antennas are restricted. SOLUTION: A radio communication apparatus includes a precoding unit configured to generate transmit weight related information, an optimum transmit power calculation unit and a transmission unit configured to transmit a radio signal with a calculated transmit power level. The optimum transmit power calculation unit receives the transmit weight related information from the precoding unit and calculates the transmit power level to optimize an objective function in accordance with an interior point method. The objective function results from addition of a penalty function adjusted with a step coefficient to an original objective function associated with a constrained optimization problem. The original objective function includes a function of respective channel capacities for individual users derived from the transmit weight related information. The optimum transmit power calculation unit adaptively updates a logarithm of the step coefficient and uses a gradient obtained through a high-order derivative with the logarithm of the step coefficient to calculate the transmit power level to optimize the resulting objective function. COPYRIGHT: (C)2010,JPO&INPIT
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