Non‐circularity coefficient estimation of the SOI for narrowband widely linear beamforming
Yougen Xu, Yulin Huang, Junfeng Liu, Zhiwen Liu · IET Microwaves Antennas & Propagation · 2019
In widely linear beamforming, the second‐order non‐circularity property exhibited by the signal‐of‐interest (SOI) can be exploited to improve interference and noise suppression. Assuming known SOI steering vector and spatially white noise, several algebraic schemes for estimating the SOI non‐circularity coefficient are proposed in the context of narrowband widely linear beamforming without training/reference signal. These new estimators are based on signal purification, pseudoinverse, oblique projection, and pre‐processed subspace separation. Simulation results are included to illustrate the performances of the proposed methods.