A disclosed radio communication apparatus includes a precoding unit, a optimum transmit power calculation unit and a transmission unit. The optimum transmit power calculation unit receives the transmit weight related information from the precoding unit and calculates a transmit power level to optimize an objective function in accordance with an interior point method. The objective function results from addition of a barrier function adjusted with a barrier parameter 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 barrier parameter and uses a gradient obtained through a high-order derivative with the logarithm of the barrier parameter to calculate the transmit power level to optimize the resulting objective function.

Claims

20 · 2 independent · depth 3

20 granted claims

›1.independentA radio communication apparatus for transmitting a radio signal to multiple users via multiple transmit antenna groups at appropriate transmit power l…+9

›2.↳ 1The radio communication apparatus as claimed in claim 1, wherein the optimum transmit power calculation unit is configured to use a high-order differe…d2

›3.↳ 1The radio communication apparatus as claimed in claim 1, wherein the optimum transmit power calculation unit is configured to use a high-order differe…d2

›4.↳ 1The radio communication apparatus as claimed in claim 1, wherein the optimum transmit power calculation unit is configured to use a high-order differe…d2

›5.↳ 1The radio communication apparatus as claimed in claim 1, wherein the optimum transmit power calculation unit is configured to use a second-order diffe…d2

›6.↳ 1The radio communication apparatus as claimed in claim 1, wherein the optimum transmit power calculation unit is configured to use a steepest descent m…d2+1

›8.↳ 1The radio communication apparatus as claimed in claim 1, whereinnthe optimum transmit power calculation unit is configured to terminate step iteration…d2

›9.↳ 1The radio communication apparatus as claimed in claim 1, wherein the optimum transmit power calculation unit is configured to perform the constrained …d2

›10.↳ 1The radio communication apparatus as claimed in claim 1, wherein the optimum transmit power calculation unit is configured to perform the constrained …d2

›11.independentA radio communication method for transmitting a radio signal to multiple users via multiple transmit antenna groups at appropriate transmit power leve…+9

›12.↳ 11The radio communication method as claimed in claim 11, wherein the calculating comprises using a high-order differential value of the resulting object…d2

›13.↳ 11The radio communication method as claimed in claim 11, wherein the calculating comprises using a high-order differential value of the original objecti…d2

›14.↳ 11The radio communication method as claimed in claim 11, wherein the calculating comprises using a high-order differential value of a monotonically decr…d2

›15.↳ 11The radio communication method as claimed in claim 11, wherein the calculating comprises using a second-order differential as the high-order different…d2

›16.↳ 11The radio communication method as claimed in claim 11, wherein the calculating comprises using a steepest descent method in the interior point method …d2+1

›18.↳ 11The radio communication method as claimed in claim 11, wherein the calculating comprises terminating step iteration in the interior point method if an…d2

›19.↳ 11The radio communication method as claimed in claim 11, wherein the calculating comprises performing the constrained optimization to make respective ch…d2

›20.↳ 11The radio communication method as claimed in claim 11, wherein the calculating comprises performing the constrained optimization to maximize channel c…d2

Classifications

4 codes

IPC · International Patent Classification

Section H — Electricity

H04B7/00

USPC · US Patent Classification

455/522455/452.1455/509

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Pendency

2.8 y

1,035 days filing → grant

Office actions

none on record

Responses

2 RCE

Examiner

James H Cho

art unit 2819 · TC 2800

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Citations: 10 back · 0 forward

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Priority chain

1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20090280856 A1	12 Nov 2009

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