Patent ID: 9231632
Filing Date: 2016-01-05
CPC Classification: H04B,H04J,H04L

Claim Text:
1. An interference canceller used in a MIMO receiver, the interference canceller comprising: an interference cancellation coefficient calculator configured to calculate an interference cancellation coefficient using a received value at a subcarrier frequency location of each reference signal (RS) from a channel estimate H calculated by a channel estimator of the MIMO receiver and a received signal r delivered from an FFT block of the MIMO receiver; and an interference cancellation filter configured to generate an interference-cancelled received signal r′ and a channel estimate H′, using the interference cancellation coefficient, wherein the reference signal (RS) is a known symbol located in a specific subcarrier frequency in a frequency domain, and further comprising a switch configured to deliver the received signal r and the channel estimate H to an ML detector of the MIMO receiver when a ratio of the channel estimate H and the interference-cancelled channel estimate H′ does not exceed a threshold value, and to deliver the interference-cancelled received signal r′ and the channel estimate H′ to the ML detector of the MIMO receiver when the ratio exceeds the threshold value.