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Cooperative beamforming in cognitive radio systems without feedback of receiver beamforming vectors to transmitter

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Abstract

In this paper, we investigate the problem of transceiver beamforming and power allocation in the downlink of a multiple input multiple output Cognitive radio system. In this system, a base station (BS) services multiple primary users (PU) and multiple secondary users (SU). In order to perform transceiver beamforming and power allocation, three new algorithms are proposed. The first one is an iterative single-objective constrained algorithm, in which the signal to interference plus noise (SINR) of SUs are improved at each iteration subject to constraints on quality of services of PUs (PUs SINR should be above a predefined threshold) and total transmit power of BS. The second and third algorithms, are based on a multi-objective constraint optimization problem, in which the goal is to improve both PUs and SUs SINR at each iteration subject to previous constraints of the first algorithm. The difference between the second and third algorithms is that in the joint maximization of the second algorithm, the cross-influence of each user on the others is ignored, but in the third algorithm, the cross effect of each users SINR on the others is considered. The novelty of these algorithms is the independency of the transmit precoding vectors from the receive beamforming vectors. Therefore, the feedback of receive beamforming to the BS is not needed. The performances of three proposed algorithms are evaluated in simulations vis bit error rate of PUs and SUs, SINR of PUs and SUs and the percent of BS power allocation to SUs.

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Authors and Affiliations

  1. Electrical Engineering Department, Khorasan Institute of Higher Education, Mashhad, Iran

    Mohsen Abbasi-Jannatabad

  2. Department of Electrical Engineering, University of Torbat Heydarieh, Torbat Heydarieh, Iran

    Seyyed Mohammad Javad Asgari Tabatabaee

Authors
  1. Mohsen Abbasi-Jannatabad
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  2. Seyyed Mohammad Javad Asgari Tabatabaee
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Correspondence to Mohsen Abbasi-Jannatabad.

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Abbasi-Jannatabad, M., Tabatabaee, S.M.J.A. Cooperative beamforming in cognitive radio systems without feedback of receiver beamforming vectors to transmitter. Wireless Netw 27, 2067–2079 (2021). https://doi.org/10.1007/s11276-021-02541-1

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