Patent ID: 7907910

Claim:
A method of assigning power levels to Orthogonal Frequency-Division Multiple Access (OFDMA) 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 P(j) of each uplink OFDM training signal (j) according to P ⁡ ( j ) = Tx ⁢ Power + 10 ⁢ ⁢ log 10 ⁡ ( 1 T n ⁢ min i ⁢ σ d 2 ⁡ ( i ) σ d 2 ⁡ ( j ) ) , wherein TxPower is a sum of transmit power per OFDMA symbol, T n is a number of training signals and σ d 2 (j) is the interference level measured at the vicinity of the j-th training signal; decreasing the transmission power level of each uplink OFDMA training signal whose frequency is in a near vicinity of a frequency of an interferer signal according to the interference level of the interferer signal; and transmitting the OFDM training signals over the uplink according to the interference dependent power scheme.