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US 7,460,876 B2Granted
System and method for intelligent transmitted power control scheme
AssigneeIntel Corporation
InventorsAli S. Sadri, Alexander A. Maltsev, Alexey E. Rubtsov, Vadim S. Sergeyev
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Abstract
Briefly, an adaptive transmitted power control scheme, which may be used in stations of a communication system, for example, a wireless communication system. The scheme may allocate transmission power to a communication station based on multiplying each of at least one transmitted subcarrier complex number by a corresponding subcarrier weight. Additionally, a detection scheme may detect whether a transmitted power control scheme according to an embodiment of the invention is used by stations of the communication system. The allocation of transmission power may be also used to transmit additional service information through channels.
Claims23
A method comprising:
- receiving a signal transmitted over subcarriers;
- estimating power gains of said subcarriers from said received signal;
- determining a channel deviation of said subcarriers;
- providing a modulated signal for transmission over said subcarriers;
- calculating subcarrier weights for said modulated signal, wherein said subcarrier weights are inversely proportional to said estimated power gains if said channel deviation is equal to or less than a predetermined threshold, and wherein said subcarrier weights are substantially all units if said channel deviation is greater than said predetermined threshold, and wherein said subcarrier weights are calculated so that the total transmission power remains substantially constant;
- and
- weighting said modulated signal with said subcarrier weights.
4 more elements
A method comprising:
- providing a modulated signal for transmission over subcarriers;
- generating a test signal having weights defining aforethought distortion;
- weighting said modulated signal with said weights of said test signal to provide an aforethought distorted signal;
- transmitting said aforethought distorted signal to a station over said subcarriers;
- receiving a signal transmitted by said station over said subcarriers after said step of transmitting;
- filtering said received signal with weights inversely proportional to said weights of said test signal to provide a filtered signal;
- determining said received signal contains inverted aforethought distortion if said filtered signal is above a predetermined threshold and determining said received signal does not contain inverted aforethought distortion if said filtered signal is equal to or below said predetermined threshold;
- and
- storing said determination.
6 more elements
A wireless communication device, comprising:
- a receiver to receive a signal transmitted over subcarriers;
- a channel estimation and equalization unit to estimate power gains of said subcarriers from said received signal;
- a channel deviation estimator to determine a channel deviation of said subcarriers;
- a subcarrier modulation mapping unit to provide a modulated signal for transmission over said subcarriers;
- a subcarrier weights calculating unit to calculate subcarrier weights for said modulated signal, wherein said subcarrier weights are inversely proportional to said estimated power gains if said channel deviation is equal to or less than a predetermined threshold, and wherein said subcarrier weights are substantially all units if said channel deviation is greater than said predetermined threshold, and wherein said subcarrier weights are calculated so that the total transmission power remains substantially constant;
- and
- a subcarriers weighting unit to weight said modulated signal with said subcarrier weights.
4 more elements
A wireless communication device comprising:
- a subcarrier modulation mapping unit to provide a modulated signal for transmission over subcarriers;
- a test generator to generate a test signal having weights defining aforethought distortion;
- a subcarriers weighting unit to weight said modulated signal with said weights of said test signal to provide an aforethought distorted signal;
- a transmitter to transmit said aforethought distorted signal to a station over said subcarriers;
- a receiver to receive a signal transmitted by said station over said subcarriers after said step of transmitting;
- a filter to filter said received signal with weights inversely proportional to said weights of said test signal to provide a filtered signal;
- a threshold device to determine said received signal contains inverted aforethought distortion if said filtered signal is above a predetermined threshold and to determine said received signal does not contain inverted aforethought distortion if said filtered signal is equal to or below said predetermined threshold;
- and
- a storage device to store said determination.
6 more elements
Dependencies are inferred from the claim text.