Patent ID: 8542766

Claim:
A method for amplifying a transmission signal by a non-linear power amplifier, the method comprising: capturing an input signal and a feedback signal; determining a first time delay between the input signal and the feedback signal; determining, by a first number of filters, a second time delay between the input signal and the feedback signal, the determination of the second time delay having a higher resolution than the determination of the first time delay; determining a first Measure of Error (ME) for each of the first number of filters using one equation selected from among the following equations: min i ⁢ ME ⁡ ( i ) = ∑ m = 1 N ⁢ ( R ⁡ ( m ) ⁢ F * ( m ) ) ( ∑ m = 1 N ⁢  R ⁡ ( m )  2 ) ⁢ ( ∑ m = 1 N ⁢  F ⁡ ( m )  2 ) ⁢ ⁢ for ⁢ ⁢ 1 ≤ i ≤ S wherein R(m) denotes the input signal, F(m) denotes the feedback signal, S denotes the first number of filters, and N denotes an amount of data captured from the input signal and the feedback signal, min i ⁢ ME ⁡ ( i ) = ∑ m = 1 N ⁢ ( R ⁡ ( m ) ⁢ F * ( m ) ) ( ∑ m = 1 N ⁢  R ⁡ ( m )  2 ) ⁢ ( ∑ m = 1 N ⁢  F ⁡ ( m )  2 ) ⁢ ⁢ for ⁢ ⁢ 1 ≤ i ≤ S wherein R(m) denotes the input signal, F(m) denotes the feedback signal, S denotes the first number of filters, and N denotes an amount of data captured from the input signal and the feedback signal, min i ⁢ ME ⁡ ( i ) = ∑ m = 1 N ⁢ (  I R ⁡ ( m ) - I F ⁡ ( m )  +  Q R ⁡ ( m ) - Q F ⁡ ( m )  ) ⁢ ⁢ for ⁢ ⁢ 1 ≤ i ≤ S wherein R(m) denotes the input signal, F(m) denotes the feedback signal, S denotes the first number of filters, and N denotes an amount of data captured from the input signal and the feedback signal, min i ⁢ ME ⁡ ( i ) = ∑ m = 1 N ⁢ (  R ⁡ ( m )  -  F ⁡ ( m )  ) ⁢ ⁢ for ⁢ ⁢ 1 ≤ i ≤ S wherein R(m) denotes the input signal, F(m) denotes the feedback signal, S denotes the first number of filters, and N denotes an amount of data captured from the input signal and the feedback signal, and min i ⁢ ME ⁡ ( i ) = ∑ m = 1 N ⁢ (  angle ⁡ ( R ⁡ ( m ) ) - angle ⁡ ( F ⁡ ( m ) )  ) ⁢ ⁢ for ⁢ ⁢ 1 ≤ i ≤ S wherein R(m) denotes the input signal, F(m) denotes the feedback signal, S denotes the first number of filters, and N denotes an amount of data captured from the input signal and the feedback signal; and applying the first time delay and the second time delay to temporally align the input signal with the feedback signal.