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Multiple Antenna Selection for Underlay Cognitive Radio Systems with Interference Constraint

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Abstract

The spectrum sharing concept of Cognitive Radio Networks (CRN) improves the efficiency of spectrum utilization by satisfying the current spectrum demands. The combination of Multiple Input Multiple Output (MIMO) and CRN results in achieving high spectrum efficiency and allocation of more spatial dimensions for SUs. But the main drawback is, as the number of antennas increase, the RF chain also increases thereby increasing the computational complexity and hardware costs. Antenna selection (AS) techniques reduce the number of RF chains while guaranteeing the performance of multiple antenna systems. In this paper, we present an AS scheme; in particular we present a joint transmit and receive multiple AS method for underlay CR environment, thus maintaining the multiplexing benefit of MIMO systems. This technique maximizes the capacity as well as minimizes the symbol error probability while satisfying interference constraint at the primary user receiver. The closed form expression for CDF of SNR of the selected Single Input Single output link is derived. The simulation results show that the proposed method achieves improved performance in terms of SNR.

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Correspondence to P. Reba.

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Reba, P., Uma Maheswari, G. & Satheesh Babu, M. Multiple Antenna Selection for Underlay Cognitive Radio Systems with Interference Constraint. Wireless Pers Commun 98, 1505–1520 (2018). https://doi.org/10.1007/s11277-017-4931-7

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Keywords

  • Antenna selection
  • Underlay cognitive radio
  • MIMO cognitive radio
  • Ergodic rates
  • Symbol error probability