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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Selective Subspace Interference Alignment for Cognitive Radio Systems

선택적 부분공간 간섭 정렬을 이용한 상황인식 시스템

  • Received : 2011.05.12
  • Accepted : 2011.05.19
  • Published : 2011.06.30
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Abstract

This paper presents a selective interference alignment for cognitive radio system with spectrum leasing. The proposed method selects users who cause severe interference to other basestations that have required SINR. Since few users are selected to apply subspace interference alignment, the total complexity of the system is not high compared with that of the system who utilizes subspace interference alignment to all users. In addition, all users can transmit without considering interference. The computer simulation shows the proposed method exhibits 350% throughput enhancement at a two cell case, and 400% increase at a three cell case.

본 논문에서는 상황인식(CR: Cognitive Radio) 시스템에서 CR 시스템이 우선사용자와 spectrum leasing 관계에 있을 때 간섭을 많이 주는 사용자를 선택하고 이들에게 선택적으로 부분공간 간섭정렬방식을 적용해 우선사용자와 CR 사용자에게 모두 데이터 전송을 가능케 하는 방식을 제안하였다. 각 기지국들은 사용자의 간섭 신호량을 가지고 자신의 기지국에서 요구하는 복호 가능한 SINR(signal-to-interference ratio)를 넘지 않도록 주변 셀의 간섭신호가 큰 사용자들을 순환적으로 선택하고 이들에게 선택적으로 부분공간 간섭정렬방식을 적용하는 방법이다. 제안된 방법으로 모든 사용자들은 다른 간섭에 대한 제약 없이 통신이 가능하게 된다. 전산모의실험으로 제안한 방법은 선택적 간섭정렬을 적용 안 하는 방법보다 합 용량에서 약 350% ~400% 증가함을 보였다.

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References

  1. IEEE Std 802.11n-2009, "IEEE Standard for Information Technologh-Telecommunications and Information Exchanges Between Systems- Local and Metropolitan Area Networks- Specific Requirements Part 11: Wireless Lan Medium Access Control (MAC) and Physical Layer (PHY) Specification Amendment 5: Enhancements for Higher Throughput."
  2. IEEE Std 802.16-2009, "IEEE Standard for Local and Metropolitan Area Networks Part 16: Air Interface for Broadband Wireless Access Systems."
  3. FCC, Spectrum policy task force report, ET Docket No.02-155, Nov. 2002.
  4. FCC ET Docket No.03-322, "Notice of Rule Making and Order," Dec. 2003.
  5. J. Mitola, "Cognitive radio for flexible mobile multimedia communications," in Proc. of IEEE workshop on Mobile Multimedia Comm, Nov. 1999.
  6. IEEE 802.22-06/0004r0, A PHY/MAC Proposal for IEEE 802.22 WRAN systems, Part 1: The PHY, Jan. 2006.
  7. S. Haykin, "Cognitive radio : Brain-empowered wireless communications," IEEE Journal on Selected areas in Comm, Vol.23, No.2 , pp.201-220, Feb. 2005. https://doi.org/10.1109/JSAC.2004.839380
  8. D. Cabric and R. Broderson, "Physical layer design issues unique to cognitive radio systems," in Proc. IEEE PIMRC, Berlin, Germany, pp.759-763, Sep. 2005.
  9. K. Jayaweera and T. Li, "Dynamic spectrum leasing in cognitive radio networks via primary-secondary user power control games," IEEE Trans. Wireless Comm., Vol.8, No.6, pp.3300-3310, Jun. 2009. https://doi.org/10.1109/TWC.2009.081230
  10. G. Vazquez-Vilar, C. Mosquera and K. Jayaweera, "Primary user enters the game : performance of dynamic spectrum leasing in cognitive radio networks," IEEE Trans. Wireless Comm., Vol.9, No.12, pp.3625-3629, Dec. 2010.
  11. V. R. Cadambe and S. A, Jafar "Interference Alignment and Degrees of Freedom of the K-User Interference Channel," IEEE Trans. on Information Theory, Vol.54, No.8, pp.3424-3441, Aug. 2008.
  12. C. Suh and D. Tse "Interference Alignment for Cellular Networks," in Proc. of Communication, Control and Computing, 2008 46th Annual Allerton Conference, Sep. 2008.