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US 2010/0075710 A1Published application
Method and apparatus to vary power level of training signal
AssigneeIntel Corporation
InventorsIlan Sutskover, David Ben-Eli
Life of this patent
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Abstract
Briefly, a method to transmit over an uplink channel a training signal having a power level which varies according to a parameter related to downlink channel characteristics is provided. Communication system that includes communication devices to transmit and receive the training signal is further provided.
Claims19
A method of assigning power levels to Orthogonal Frequency-Division Multiplexing (OFDM) training signals comprising:
- receiving, over a downlink, a message including a transmit method value, wherein the transmit method value indicates an interference dependent power scheme;
- determining a transmission power level of each uplink OFDM training signal, wherein said transmission power level varies according to downlink channel characteristics and is inversely proportional to an interference level of a frequency in the vicinity of downlink OFDM training signal frequency;
- transmitting over an uplink channel two or more OFDM training signals according to the interference dependent power scheme;
- and
- varying a power level of at least one OFDM training signal of the two or more OFDM training signals according to a parameter related to characteristics of a downlink channel.
2 more elements
A wireless communication device comprising:
- a receiver to receive, over a downlink, a message including a transmit method value, wherein the transmit method value indicates an interference dependent power scheme;
- an estimator to estimate an interference power level of each Orthogonal Frequency-Division Multiplexing OFDM training signal received over the downlink;
- a power level controller to determine a transmission power of each uplink OFDM training signal according to an estimated interference power level of each downlink OFDM training signal, wherein said transmission power level is inversely proportional to said estimated interference level at a vicinity in frequency of downlink OFDM training signal frequency;
- and
- a transmitter having an antenna port to transmit over an uplink channel two or more OFDM training signal wherein at least one training signal of the two or more OFDM training signal has a power level which is adapted according to a parameter related to downlink channel characteristics.
2 more elements
A wireless communication system comprising:
- a communication device having a receiver to receive, over a downlink, a message including a transmit method value, wherein the transmit method value indicates an interference dependent power scheme, to determine a first and second transmission power level of each uplink OFDM training signal, wherein said transmission power level is inversely proportional to an interference level of a frequency in the vicinity of downlink OFDM training signal frequency and to transmit over an uplink channel two or more OFDM training signals having a power level which is adapted according to a parameter of downlink channel characteristics.
Dependencies are inferred from the claim text.