Patent ID: 8676144
Filing Date: 2014-03-18
Classification: H04B

Abstract:
1. A method comprising: at a wireless device, analyzing energy received at a plurality of antennas in an unlicensed frequency band performed to detect interference in the unlicensed frequency band during first time intervals between reception of desired signals at the wireless device; determining the type of interference detected in the received energy during the first time intervals; generating parameters for a spatial nulling filter including a finite impulse response (FIR) filter based on the type of interference detected in the received energy during the first time intervals, wherein the generating comprises: supplying the parameters, including the FIR filter coefficients, to the FIR filter of the nulling filter prior to a second time interval when the desired signals are to be received; and during the second time interval, applying in the time domain the FIR filter of the nulling filter to signals obtained from energy received at the plurality of antennas during the second time interval.