Wireless communication apparatus and method
First Claim
1. A wireless communication apparatus that transmits and receives an orthogonal frequency division multiplexing signal to communicate with a communication counterpart, the wireless communication apparatus comprising:
- measurement means for measuring the signal level of each subcarrier of the reception signal received from the communication counterpart;
calculation means for calculating a predicted signal level of each subcarrier when the communication counterpart receives the signal based on the signal level of each subcarrier of the reception signal measured by the measurement means and calculating an increase/decrease rate of transmission power for each subcarrier such that the average amount of limited mutual information limited by the modulation method for the signal is maximized based on the predicted signal level; and
transmission parameter control means for controlling transmission parameters including the increase/decrease rate of transmission power for each subcarrier calculated by the calculation means.
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Abstract
A wireless communication apparatus that transmits and receives an orthogonal frequency division multiplexing signal to communicate with a communication counterpart, the wireless communication apparatus including measurement means for measuring the signal level of each subcarrier of the reception signal received from the communication counterpart, calculation means for calculating a predicted signal level of each subcarrier when the communication counterpart receives the signal based on the signal level of each subcarrier of the reception signal measured by the measurement means and calculating an increase/decrease rate of transmission power for each subcarrier such that the average amount of limited mutual information limited by the modulation method for the signal is maximized based on the predicted signal level, and transmission parameter control means for controlling transmission parameters including the increase/decrease rate of transmission power for each subcarrier calculated by the calculation means.
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Citations
12 Claims
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1. A wireless communication apparatus that transmits and receives an orthogonal frequency division multiplexing signal to communicate with a communication counterpart, the wireless communication apparatus comprising:
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measurement means for measuring the signal level of each subcarrier of the reception signal received from the communication counterpart;
calculation means for calculating a predicted signal level of each subcarrier when the communication counterpart receives the signal based on the signal level of each subcarrier of the reception signal measured by the measurement means and calculating an increase/decrease rate of transmission power for each subcarrier such that the average amount of limited mutual information limited by the modulation method for the signal is maximized based on the predicted signal level; and
transmission parameter control means for controlling transmission parameters including the increase/decrease rate of transmission power for each subcarrier calculated by the calculation means. - View Dependent Claims (2, 3, 4)
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5. A wireless communication apparatus that transmits and receives an orthogonal frequency division multiplexing signal to communicate with a communication counterpart, the wireless communication apparatus comprising:
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measurement means for measuring the signal level of each subcarrier of the reception signal received from the communication counterpart;
calculation means for calculating a predicted signal level of each subcarrier when the communication counterpart receives the signal based on the signal level of each subcarrier of the reception signal measured by the measurement means, calculating a threshold value based on the predicted signal level and calculating an increase/decrease rate of transmission power for each subcarrier of the signal based on the comparison result of the threshold value and the predicted signal level; and
transmission parameter control means for controlling transmission parameters including the increase/decrease rate of transmission power for each subcarrier calculated by the calculation means. - View Dependent Claims (6, 7, 8)
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9. A wireless communication method for transmitting and receiving an orthogonal frequency division multiplexing signal to communicate with a communication counterpart, the wireless communication method comprising the steps of:
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measuring the signal level of each subcarrier of the reception signal received from the communication counterpart;
calculating a predicted signal level of each subcarrier when the communication counterpart receives the signal based on the signal level of each subcarrier of the reception signal measured at the measuring step and calculating an increase/decrease rate of transmission power for each subcarrier such that the average amount of limited mutual information limited by the modulation method for the signal is maximized based on the predicted signal level; and
controlling transmission parameters including the increase/decrease rate of transmission power for each subcarrier calculated at the calculating step.
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10. A wireless communication method for transmitting and receiving an orthogonal frequency division multiplexing signal to communicate with a communication counterpart, the wireless communication method comprising the steps of:
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measuring the signal level of each subcarrier of the reception signal received from the communication counterpart;
calculating a predicted signal level of each subcarrier when the communication counterpart receives the signal based on the signal level of each subcarrier of the reception signal measured at the measuring step, calculating a threshold value based on the predicted signal level and calculating an increase/decrease rate of transmission power for each subcarrier based on the comparison result of the threshold value and the predicted signal level; and
controlling transmission parameters including the increase/decrease rate of transmission power for each subcarrier calculated at the calculating step.
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11. A wireless communication apparatus that transmits and receives an orthogonal frequency division multiplexing signal to communicate with a communication counterpart, the wireless communication apparatus comprising:
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a measuring unit measuring the signal level of each subcarrier of the reception signal received from the communication counterpart;
a calculator calculating a predicted signal level of each subcarrier when the communication counterpart receives the signal based on the signal level of each subcarrier of the reception signal measured by the measuring unit and calculating an increase/decrease rate of transmission power for each subcarrier such that the average amount of limited mutual information limited by the modulation method for the signal is maximized based on the predicted signal level; and
a transmission parameter controller controlling transmission parameters including the increase/decrease rate of transmission power for each subcarrier calculated by the calculator.
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12. A wireless communication apparatus that transmits and receives an orthogonal frequency division multiplexing signal to communicate with a communication counterpart, the wireless communication apparatus comprising:
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a measuring unit measuring the signal level of each subcarrier of the reception signal received from the communication counterpart;
a calculator calculating a predicted signal level of each subcarrier when the communication counterpart receives the signal based on the signal level of each subcarrier of the reception signal measured by the measuring unit, calculating a threshold value based on the predicted signal level and calculating an increase/decrease rate of transmission power for each subcarrier of the signal based on the comparison result of the threshold value and the predicted signal level; and
a transmission parameter controller controlling transmission parameters including the increase/decrease rate of transmission power for each subcarrier calculated by the calculator.
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Specification