Apparatus for interference cancellation in MIMO receiver, method for interference cancellation in MIMO receiver and MIMO receiver

摘要

An interference canceller (500) includes an interference cancellation coefficient calculator (510) configured to calculate an interference cancellation coefficient using a received value located in a location of a reference signal (RS) from a channel estimate H calculated by a channel estimator and a received signal r delivered from an FFT, an interference cancellation filter (520) configured to cancel interference in the received signal and the channel estimate using the calculated interference cancellation coefficient, an increment or decrement operator (530) configured to increase or decrease the received signal and the channel estimate by λ times; an interference cancellation output controller (540) configured to receive a channel estimate before interference cancellation and a channel estimate after interference cancellation to compare a signal before the interference cancellation with a signal after the interference cancellation and then determine whether to deliver the signal before applying the interference cancellation or the signal after applying the interference cancellation, and a switch (550) configured to receive a control signal from the interference cancellation output controller (540).

主权项

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.