Cooperative Feedback for Multiantenna Cognitive Radio Networks
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Publication:4572807
DOI10.1109/TSP.2010.2089623zbMATH Open1392.94250arXiv0911.2952OpenAlexW2120509191WikidataQ58024730 ScholiaQ58024730MaRDI QIDQ4572807
Publication date: 18 July 2018
Published in: IEEE Transactions on Signal Processing (Search for Journal in Brave)
Abstract: Cognitive beamforming (CB) is a multi-antenna technique for efficient spectrum sharing between primary users (PUs) and secondary users (SUs) in a cognitive radio network. Specifically, a multi-antenna SU transmitter applies CB to suppress the interference to the PU receivers as well as enhance the corresponding SU-link performance. In this paper, for a multiple-input-single-output (MISO) SU channel coexisting with a single-input-single-output (SISO) PU channel, we propose a new and practical paradigm for designing CB based on the finite-rate cooperative feedback from the PU receiver to the SU transmitter. Specifically, the PU receiver communicates to the SU transmitter the quantized SU-to-PU channel direction information (CDI) for computing the SU transmit beamformer, and the interference power control (IPC) signal that regulates the SU transmission power according to the tolerable interference margin at the PU receiver. Two CB algorithms based on cooperative feedback are proposed: one restricts the SU transmit beamformer to be orthogonal to the quantized SU-to-PU channel direction and the other relaxes such a constraint. In addition, cooperative feedforward of the SU CDI from the SU transmitter to the PU receiver is exploited to allow more efficient cooperative feedback. The outage probabilities of the SU link for different CB and cooperative feedback/feedforward algorithms are analyzed, from which the optimal bit-allocation tradeoff between the CDI and IPC feedback is characterized.
Full work available at URL: https://arxiv.org/abs/0911.2952
Signal theory (characterization, reconstruction, filtering, etc.) (94A12) Antennas, waveguides in optics and electromagnetic theory (78A50)
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