The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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User Selection Scheme for the Performance Improvement of the Secondary System in Cognitive Radio Systems using Underlay Mode

후 순위 시스템의 성능 향상을 위한 언더레이 기반의 인지 무선 시스템의 사용자 선택 기법

  • 최로미 (인천대학교 전자공학과 통신신호처리 연구실) ;
  • 변윤식 (인천대학교 전자공학과 통신신호처리 연구실)
  • Received : 2012.10.18
  • Accepted : 2013.01.25
  • Published : 2013.03.29
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Abstract

Recently, data traffic is significantly increased by high rate data service. As a result, radio spectrum is considered one of the most scarce and valuable resources for wireless communications. For the solution of this problem, cognitive radio(CR) has been proposed as an efficient means to opportunistic spectrum sharing between primary (licensed) users and cognitive radio users. In this paper, user selection scheme in CR networks is proposed for additional consideration of secondary system. The proposed user selection scheme mitigates interference to primary user by using orthogonal channel vectors while improves performance of secondary system. Simulation results show that the proposed scheme achieves 1.62bps/Hz higher average throughput of whole system than one of the existing scheme.

최근 고속 데이터 서비스의 보급으로 데이터 사용량이 급증함에 따라 이를 수용하기 위한 주파수 자원의 효율적 사용 방법에 대한 연구가 주목받고 있다. 따라서 주파수 효율성을 향상시키기 위해 주파수 사용에 대한 우선권을 가진 사용자와 후순위에 있는 사용자가 해당 주파수 대역을 공유하는 기술인 인지 무선 기술(Cognitive Radio, CR)이 제안되었다. 본 논문에서는 CR 시스템에서 직교하는 채널 벡터를 이용하여 선순위 시스템에게 미치는 간섭을 줄이면서 후순위 시스템의 성능 향상을 동시에 고려한 사용자 선택 기법을 제안한다. 모의실험 결과 제안 기법을 적용했을 때 전체 시스템의 합 용량이 기존 기법보다 약 1.62bps/Hz의 이득을 가지는 것을 확인하였다.

Keywords

References

  1. J. Mitola, "Cognitive radio for flexible mobile multimedia communications," in Proc. of IEEE workshop on Mobile Multimedia Commun.(MoMuC), San Diego, USA, Nov. 1999.
  2. E. Hossain, D. Niyato, and Z. Han, Dynamic Spectrum Access and Management in Cognitive Radio Networks, Cambridge University Press, 2009.
  3. A. M. Wyglinski, M. Nekovee, and Y. T. Hou, Cognitive radio communications and networks : principles and practice, Academic Press, 2010.
  4. K. Hamdi, W. Zhang, and K. B. Letaief, "Joint beamforming and scheduling in cognitive radio networks," in Proc. IEEE Globecom, pp.2977-2981, Washington, D. C., USA, Nov. 2007.
  5. H. Du, T. Ratnarajah M. Pesavento, and C. B. Papadias, "Joint transceiver beamforming in MIMO cognitive radio network via second-order cone programing," IEEE Trans. Signal Process. vol. 60, no. 2, pp.781-792, Feb. 2012. https://doi.org/10.1109/TSP.2011.2174790
  6. S. Stotas and A. Nallanthan, "Enhancing the capacity of spectrum sharing cognitive radio networks," IEEE Trans. Veh. Technol. vol. 60, no. 8, pp.3768-3779, Oct. 2011. https://doi.org/10.1109/TVT.2011.2165306
  7. B. Wang and D. Zhao, "Scheduling for long term proportional fairness in a cognitive radio wireless networks with spectrum underlay," IEEE Trnas. Wireless Commun., vol. 9, no. 3, pp.1150-1158, Mar. 2010. https://doi.org/10.1109/TWC.2010.03.090802
  8. Y. Kwon, J. Yoo, I. Lee, and J. Chung, "Spectrum co-existence method using orthogonal beamforming in cognitive radio systems," J. KICS, vol. 33, no. 11, pp.1013-1020, Nov. 2008.
  9. A. Bayesteh and A. K. Khandani, "On the user selection for MIMO broadcast channels." IEEE Trans. Inf. Theory, vol. 54, no. 3, pp.1086-1107, Mar. 2008. https://doi.org/10.1109/TIT.2007.915887
  10. M. Trivellato, F. Boccardi, and F. Tosato, "User selection schemes for MIMO broadcast channel with limited feedback," in Proc. IEEE Veh. Tecnol. Cof. (VTC), pp.2089-2093, Dublin, Ireland, Apr. 2007.
  11. S. Sagong, J. Lee, and D. Hong, "Capacity of reactive DF scheme in cognitive relay networks," IEEE Trans. Wireless Commun., vol. 10, no. 10, pp.3133-3138, Oct. 2011. https://doi.org/10.1109/TWC.2011.081011.101849
  12. J. Xiang, Y. Zhang, T. Skeie, and L. Xie, "Downlink spectrum sharing for cognitive radio femtocell networks." IEEE Sys. J., vol. 4, no. 4, pp.524-534, Dec. 2010. https://doi.org/10.1109/JSYST.2010.2083230
  13. B. A. Fette, Cognitive Radio Technology, Academic Press, 2009.
  14. H. Guo and V. C. M. Leung, "Orthogonal transmissions for spectrum underlay MISO cognitive radio," IEEE Trans. Wireless Commun., vol. 11, no. 4, pp.1266-1270, Apr. 2012. https://doi.org/10.1109/TWC.2012.021412.110705
  15. C. Shem and M. P. Fitz, "Opportunistic spatial orthogonalization and its application in fading cognitive radio networks," IEEE J. Sel. Topics Signal Process., vol. 5, no. 1, pp.182-189, Feb. 2011. https://doi.org/10.1109/JSTSP.2010.2056671
  16. R. Choe, Y. S. Byun, "User selection scheme for performance improvement of secondary system in cognitive radio system," in Proc. Korea Signal Processing Conference (KSPC), vol. 25, no.1, pp.226-228, Suwon, Korea, Sep. 2012.
  17. T. W. Ban, W. Choi, B. C. Jung, and D. K. Sung, "Multi-user diversity in an spectrum sharing system," IEEE Trans. Wireless Commun., vol. 8, no. 1, pp.102-106, Jan. 2009 https://doi.org/10.1109/T-WC.2009.080326