Patent ID: 7146138

Claim:
A wireless peak suppression and pre-distortion circuit for use with multi-carrier power amplifiers in a wireless communication system to enhance the linearity and performance of the amplifier, in wireless cellular, PCS, wireless LAN, line of sight microwave, military, or satellite communication systems, the peak suppression and pre-distortion circuit comprising: two multi-carrier receivers one for the peak suppression and pre-distortion main IF or RF signal input and one for amplifier feedback input; wherein when the main signal is baseband then the main multi-carrier receiver is bypassed; a digital signal processing block to peak suppress and pre-distort the main multi-carrier input signal using lookup tables; a digital signal processing block to use the main multi-carrier input signal and amplifier feedback multi-carrier input to adaptively update the pre-distortion lookup table; a digital signal processing block to use the input and the output of the peak suppression to produce the phase rotation lookup table; a digital signal processing block to evaluate the delay between the main multi-carrier signal and the amplifier multi-carrier feedback signal and adjust the main signal delay before being used by the lookup table adaptation algorithm; wherein the algorithm will continuously adjust the delay during the operation; a digital signal processing block to evaluate the gain between the main multi-carrier signal and the amplifier multi-carrier feedback signal and adjust the both signal's gain before being used by the lookup table adaptation algorithm wherein the algorithm will continuously adjust the gain during the operation; a digital signal processing block to accurately evaluate the delay between the main multi-carrier signal and the amplifier multi-carrier feedback signal by changing the coefficient of a decimation filter used in the path of amplifier feedback signal to produce T/k accuracy; and a multi-carrier transmitter block that prepare the peak suppressed and pre-distorted main multi-carrier signal for delivery to multi-carrier power amplifier.