Single antenna interference cancellation via complement subspace projection in spatial-temporal expansion of noise estimation

[Subject] Interference removal art in a single antenna receiver is provided. [Means for Solution] Interference removal in a radio communications system contains a step which determines signal assistant partial space between space-time which is a complementary set of signal subspace between space-time of an interference signal included in a received signal. A received signal is projected on signal assistant partial space between space-time, and an interference signal included in a received signal by this is decreased. Presumption of an interference signal, determination of the Brock Yule Walker procession to a presumed interference signal, and determination of signal assistant partial space between space-time from the Brock Yule Walker procession can contain in determination of signal assistant partial space between space-time. [Chosen drawing] Drawing 2