Apparatus and method for removing interference by ICS repeater using standardizer

摘要

The present disclosure relates to an interference cancellation method and device of an ICS repeater using a leveler, and may effectively cancel only interference signals by using a leveler without using a magnetic correlation cancellation device or digital filter in order to cancel unnecessary noise signals generated by narrow-band signals and enable an ICS repeater design for an LTE wireless network that needs a short system time delay.

主权项

1. An interference cancellation device of an ICS repeater using a leveler that is disposed between a reception antenna and a transmission antenna for a wireless network repeater, subtracts a predicted feedback signal y′(n) from an ICS engine from an original signal d(n) input through the reception antenna, and outputs an error signal e(n) devoid of an interference signal to the transmission antenna side, the interference cancellation device comprising:
a time delay unit configured to delay an error signal e(n) output through the subtractor for a certain time to generate a reference signal x(n); a leveler configured to level a characteristic of a narrowband signal from the reference signal x(n) output from the time delay unit to generate a new reference signal x′(n); a coefficient generator configured to calculate correlation between the new reference signal x′(n) output from the leveler and the error signal e(n) to calculate an interference signal prediction coefficient w(n); and a finite impulse response (FIR) filter configured to generate a predicted feedback signal y′(n) by convolution of the reference signal x(n) from the time delay unit and the prediction coefficient w(n) from the coefficient generator to input the generated signal to the subtractor.