Method of compensating signal imbalance of wireless communication system

摘要

Filter coefficients are generated by testing a wireless communication system using single-tone signals. While using the filter coefficients in a filter module, signal imbalance caused by a local oscillator or analog elements in a wireless communication system can be eliminated, so as to prevent the wireless communication system from being affected by the noises.

主权项

1. A method of compensating signal imbalance in a wireless communication system, comprising:
receiving N first single-tone signals and N second single-tone signals at a receiver of the wireless communication system, wherein frequencies of the N first single-tone signals are different, frequencies of the N second single-tone signals are different, each of the N first single-tone signals has a corresponding second single-tone signal from the N second single-tone signals, and a difference between a frequency of each first single-tone signal and a local oscillating frequency is equal to a difference between a frequency of each second single-tone signal and the local oscillating frequency; transforming the N first single-tone signals from a time domain to a frequency domain for generating a first signal coefficient and a first image coefficient for each of the N first single-tone signals; dividing a complex conjugate of the first signal coefficient of each the first single-tone signal by the first image coefficient of each said first single-tone signal to generate N first frequency-domain filter coefficients; transforming the N second single-tone signals from the time domain to the frequency domain for generating a second signal coefficient and a second image coefficient for each of the N second single-tone signals; dividing a complex conjugate of the second signal coefficient of each the second single-tone signal by the second image coefficient of each said second single-tone signal to generate N second frequency-domain filter coefficients; performing inverse Fast Fourier Transform (IFFT) on the N first frequency-domain filter coefficients and the N second frequency-domain filter coefficients to generate 2N time-domain filter coefficients; and utilizing the 2N time-domain filter coefficients to process complex conjugates of a plurality of wireless signals to generate a plurality of compensation signals, and adding the plurality of compensation signals and the plurality of wireless signals to generate a plurality of compensated signals.