Patent ID: 9001712
Filing Date: 2015-04-07
Classification: H04B,H04L

Abstract:
1. A radio frequency (RF) receive-band filter in a wireless base station, comprising: an observation chain in a receive path to receive a composite RF signal sum including a received signal component r(t), a transmitter leakage signal component l(t) and a subtractive correction signal component c(t) and to amplify and convert the time domain sum of [r(t)+l(t)−c(t)] to a digital domain data set f(n); an adaptation chain communicatively coupled to the observation chain to receive a digital baseband data set x(n) from a transmitter generating the transmitter leakage component l(t), to digitally down-convert and filter f(n) to a baseband frequency associated with x(n) to obtain y(n), to generate a set of adaptive cancelation filter coefficients H_C, and to filter x(n) using H_C to obtain a cancelation data set z(n); and a correction chain communicatively coupled to the adaptation chain to perform digital-to-analog conversion and filtering operations on z(n) to obtain z(t) and to up-convert z(t) to obtain the subtractive correction RF signal component c(t).