Differential feedback of MIMO channel correlation matrices based on geodesic curves
ICASSP '09 Proceedings of the 2009 IEEE International Conference on Acoustics, Speech and Signal Processing
Iterative water-filling for Gaussian vector multiple-access channels
IEEE Transactions on Information Theory
Interference Alignment and Degrees of Freedom of the -User Interference Channel
IEEE Transactions on Information Theory
Cognitive radio: brain-empowered wireless communications
IEEE Journal on Selected Areas in Communications
Reciprocity calibration techniques, implementation on the OpenAirInterface platform
Proceedings of the 4th International Conference on Cognitive Radio and Advanced Spectrum Management
Spatial interweave for a MIMO secondary interference channel with multiple primary users
Proceedings of the 4th International Conference on Cognitive Radio and Advanced Spectrum Management
Zero-Forcing Spatial Interweave with Greedy Scheduling
Wireless Personal Communications: An International Journal
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In this paper we propose a new method of designing the beamformer subspace in MIMO interference channel with a Time-Division Duplex (TDD) transmission scheme. In particular, this method is applied to a Spatial Interweave Cognitive Radio scenario. In our model we do not require a priori knowledge of the Channel State Information (CSI) at the transmitters. The primary and the opportunistic (cognitive) users are able to obtain information required for Tx beamforming through smart exploitation of received signal during a TDD time slot, exploiting channel reciprocity thus reducing overhead for channel estimation. The opportunistic user designs its beamformer in order to span the noise subspace at the primary receiver, thus intertwining its signal with the primary's so that its signal lies within the spatial whitespaces of the primary, possibly licensed system, causing no interference to the latter.