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Array processing for nonstationary interference suppression in DS/SS communications using subspace projection techniques

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2 Author(s)
Yimin Zhang ; Dept. of Electr. & Comput. Eng., Villanova Univ., PA, USA ; Amin, M.G.

Combined spatial and time-frequency signatures of signal arrivals at a multisensor array are used for nonstationary interference suppression in direct-sequence spread-spectrum (DS/SS) communications. With random PN spreading code and deterministic nonstationary interferers, the use of antenna arrays offers increased DS/SS signal dimensionality relative to the interferers. Interference mitigation through a spatio-temporal subspace projection technique leads to reduced DS/SS signal distortion and improved performance over the case of a single antenna receiver. The angular separation between the interference and desired signals is shown to play a fundamental role in trading off the contribution of the spatial and time-frequency signatures to the interference mitigation process. The expressions of the receiver signal-to-interference-noise ratio (SINR) implementing subspace projections are derived, and numerical results are provided

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Signal Processing, IEEE Transactions on  (Volume:49 ,  Issue: 12 )