Patent ID: 9042487
Filing Date: 2015-05-26
Classification: H04B,H04L

Abstract:
1. A quadrature signal processing method comprising: determining a clipping threshold and a gain correction value associated with data samples in an in-phase (I) arm and a quadrature (Q) arm in a channel of a quadrature receiver following frequency conversion and analog-to-digital (ADC) conversion; applying the gain correction value and clipping threshold to received and converted data in the I arm and the Q arm such as to balance a statistical distribution between data in the I arm and data in the Q arm and to enable correction of gain and phase imbalance in the I and Q arms; the determining a clipping threshold and a gain correction value including: during a first set of iterations, determining, from a gain and clipping compensated set of I data samples and Q data samples captured during a sampling period at a start of each iteration, an estimated gain compensation coefficient associated with a gain compensation function in the I arm and the Q arm and an updated clipping threshold associated with a clipping compensation function in the I arm and the Q arm of the quadrature receiver channel following frequency conversion and analog-to-digital (ADC) conversion; factoring a set of received I data samples and Q data samples using the gain compensation function to obtain a current gain compensated set of I data and Q data samples; and performing clipping operations on the current gain compensated set of I data samples and Q data samples using the updated clipping threshold outputted from the clipping compensation function to obtain a current gain and clipping compensated set of I data samples and Q data samples to use as input data to a next one of the first set of iterations.