Patent ID: 7787564
Filing Date: 2010-08-31
Classification: H04L

Abstract:
1. A combined peak reduction equalizer filter and phase/amplitude pre-distortion apparatus for use with Orthogonal Frequency Division Multiplexing (OFDM) and Orthogonal Frequency Division Multiple Access (OFDMA) signals to enhance the performance of any wireless and wireline communication transmitter, in any wireless cellular, Personal Communication System (PCS), wireless Local Area Network and Wireless Wide Area Network (LAN/WAN), WiMax, Video and Audio Wireless Broadcasting, line of sight microwave, military, optical, satellite communication systems and any other none wireless applications, the combined peak reduction equalizer filter and phase/amplitude pre-distortion comprising: a digital signal processing circuit to perform the combined peak reduction equalizer filter and phase/amplitude pre-distortion to condition, smoothen, and pre-distort the input baseband signal to a transmitter to improve the performance of the transmitter; a digital signal processing circuit that performs peak reduction equalizer filter to produce a peak reduced main baseband signal; a digital signal processing circuit that performs phase pre-distortion to produce a phase pre-distorted main baseband signal; a digital signal processing circuit that performs amplitude pre-distortion to produce an amplitude pre-distorted main baseband signal; an analog signal processing circuit that performs phase detection to produce a differential phase between input and output of an amplifier or a transmitter chain; an analog signal processing circuit that performs envelop detection to produce envelop of the signal at the output of an amplifier or a transmitter chain; a digital signal processing circuit that performs phase updating algorithm utilizing the digitized output of a phase detector and the phase of the peak reduced main baseband signal to produce a phase update for a first lookup table used by baseband phase pre-distortion function; a digital signal processing circuit that performs amplitude updating algorithm utilizing the digitized output of an envelope detector and the amplitude of the peak reduced main baseband signal to produce an amplitude update for a second lookup table used by baseband amplitude pre-distortion function; a digital signal processing circuit that performs phase polynomial updating algorithm utilizing the digitized output of the phase detector and the phase of the peak reduced main baseband signal to produce a phase polynomial update for a phase used by baseband phase pre-distortion function; a digital signal processing circuit that performs amplitude polynomial updating algorithm utilizing the digitized output of the envelope detector and the amplitude of the peak reduced main baseband signal to produce an amplitude polynomial update for an amplitude used by baseband amplitude pre-distortion function.