Interference-aware joint user selection and quantised power control schemes for uplink cognitive multiple-input multiple-output system

Naeem, Muhammad; Pareek, Udit; Lee, Daniel Chonghwan

doi:10.1049/iet-com.2011.0043

Cited by 7 publications

(3 citation statements)

References 15 publications

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“…CR networks can be categorized into three paradigms according to different side information requirements [4]: underlay, overlay and interweave. For the underlay CR system, these secondary cognitive users can transmit concurrently together with the licensed users subject to the constraints on the interference level to the licensed users [5]- [11].…”

Section: Introductionmentioning

confidence: 99%

“…[9] and [10] focused on antenna beamforming techniques, while [8] and [11] focused on user scheduling techniques. The authors of [9] applied the successive interference cancellation method to decide the beamforming weight on a QR decomposed multiple-input multiple-output (MIMO) channel matrix, and then solving the sum-rate maximization problem by allocating the transmit power on each user subject to the interference constraint.…”

Section: Introductionmentioning

confidence: 99%

“…However, the interference power constraint to the primary system was not considered in [8]. Two interference-aware power control and user scheduling algorithms were proposed in [11] to solve the optimization problem of the sum-rate capacity of CR systems under the constraint of the interference to the PU. Nevertheless, we find that the problem of joint beamforming and scheduling design in the uplink transmission of hierarchical CR systems has been rarely investigated.…”

Section: Introductionmentioning

confidence: 99%

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Optimal Beamforming and Scheduling for MIMO-OFDM Uplink Transmissions in Hierarchical Cognitive Radio Systems

Chen

Wang

2013

2013 IEEE 78th Vehicular Technology Conference (VTC Fall)

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Cognitive radio (CR) technology can be been applied in hierarchical cellular systems to allow concurrent transmissions for licensed (primary) and unlicensed (secondary) users to improve spectrum utilization. The major challenge of hierarchical CR systems is to manage the inter-cell interference between the primary and secondary systems. In the paper, we first present an optimal multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) uplink transmission scheme for hierarchical CR systems that can maximize the sum rate of the underlay secondary CR users, and prevent the primary systems from the severe interference of the secondary systems. The main contribution of this work is to propose a methodology to transform the signal to interference plus noise ratio (SINR) maximization problem of the secondary system into a quasi-convex form, thereby obtaining the optimal beamforming solution using a simple bisection method. Furthermore, we proposed a sub-optimal user scheduling algorithm in the secondary system to effectively mitigate the interference to the primary system.

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Section: Introductionmentioning

confidence: 99%