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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
권호 표지
DOI QR코드

DOI QR Code

Antenna Placement Designs for Distributed Antenna Systems with Multiple-Antenna Ports

다중 안테나 포트를 장착한 분산 안테나 시스템에서의 안테나 설계 방법

  • 이창희 (고려대학교 전기전자전파공학부 무선통신 연구실) ;
  • 박은성 (고려대학교 전기전자전파공학부 무선통신 연구실) ;
  • 이인규 (고려대학교 전기전자전파공학부 무선통신 연구실)
  • Received : 2012.09.11
  • Accepted : 2012.10.05
  • Published : 2012.10.30
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, we optimize antenna locations for a distributed antenna system (DAS) with distributed antenna (DA) ports equipped with multiple antennas under per-DA port power constraint. Maximum ratio transmission and scaled zero-forcing beamforming are employed for single-user and multi-user DAS, respectively. Instead of maximizing the cell average ergodic sum rate, we focus on a lower bound of the expected signal-to-noise ratio (SNR) for the single-cell scenario and the expected signal-to-leakage ratio (SLR) for the two-cell scenario to determine antenna locations. For the single-cell case, optimization of the SNR criterion generates a closed form solution in comparison to conventional iterative algorithms. Also, a gradient ascent algorithm is proposed to solve the SLR criterion for the two-cell scenario. Simulation results show that DAS with antenna locations obtained from the proposed algorithms achieve capacity gains over traditional centralized antenna systems.

본 논문은 포트 당 일정 파워 제약을 전제한 상황에서, 다중 안테나를 장착한 분산 안테나 (distributed antenna: DA) 포트를 갖는 분산 안테나 시스템 (distributed antenna system: DAS)의 안테나 위치 설계 방법을 분석한다. 안테나 위치의 설계를 위해 복잡하게 셀 당 평균 ergodic sum rate를 최대화하는 대신, 본 논문에서는 단일 셀 상황에서는 signal-to-noise ratio (SNR) 기댓값의 lower bound에, 그리고 이중 셀 상황에서는 signal-to-leakage ratio (SLR) 기댓값의 lower bound에 각각 초점을 맞춘다. 단일 셀 상황의 경우, 기존의 반복적 알고리즘에 비해 SNR criterion의 최적화 문제는 닫힌 형태 (closed-form)의 솔루션을 제공한다. 또한, 이중 셀 상황에선 gradient ascent 방법을 이용한 알고리즘을 제안하여 SLR criterion의 최적화 솔루션을 도출한다.

Keywords

References

  1. W. Choi and J. G. Andrews, "Downlink performance and capacity of distributed antenna systems in a multicell environment," IEEE Transactions on Wireless Communications, vol. 6, pp. 69-73, Jan. 2007. https://doi.org/10.1109/TWC.2007.05207
  2. W. Roh and A. Paulraj, "MIMO channel capacity for the distributed antenna systems," in Proc. IEEE VTC, pp. 706-709, Vancouver, Canada, Sep. 2002.
  3. D. Wang, X. You, J. Wang, Y. Wang, and X. Hou, "Spectral efficiency of distributed MIMO cellualr systems in a composite fading channel," in Proc. IEEE ICC, pp. 1259-1264, Beijing, China, May 2008.
  4. X. Wang, P. Zhu, and M. Chen, "Antenna location design for generalized distributed antenna systems," IEEE Communications Letters, vol. 13, pp. 315-317, May 2009. https://doi.org/10.1109/LCOMM.2009.090123
  5. Y. Qian, M. Chen, X. Wang, and P. Zhu, "Antenna location design for distributed antenna systems with selective transmission," in International Conference on WCSP, pp. 3893- 3897, Nanjing, China, Nov. 2009.
  6. E. Park and I. Lee, "Antenna placement for downlink distributed antenna systems with selection transmission," in Proc. IEEE VTC, Budapest, Hungary, May 2011.
  7. E. Park, S.-R. Lee, and I. Lee, "Antenna placement optimization for distributed antenna systems," IEEE Transactions on Wireless Communications, vol. 11, pp. 2468-2477, July 2012. https://doi.org/10.1109/TWC.2012.051712.110670
  8. S. Firouzabadi and A. Goldsmith, "Optimal placement of distributed antennas in cellular systems," in Proc. IEEE SPAWC, San Francisco, USA, June 2011.
  9. M. Vu, "MISO capacity with per-antenna power constraint," IEEE Transactions on Communications, vol. 59, pp. 1268-1274, May 2011. https://doi.org/10.1109/TCOMM.2011.030411.100050
  10. W. Yu and T. Lan, "Transmitter optimization for the multi-antenna downlink with per-antenna power Constraints," IEEE Transactions on Signal Processing, vol. 55, pp. 2646-2660, June 2007. https://doi.org/10.1109/TSP.2006.890905
  11. J. Zhang, R. Chen, J. G. Andrews, A. Ghosh, and R. W. Heath, "Networked MIMO with clustered linear precoding," IEEE Transactions on Wireless Communications, vol. 8, pp. 1910 -1921, April 2009. https://doi.org/10.1109/TWC.2009.080180
  12. S. Firouzabadi and A. Goldsmith, "Downlink performance and capacity of distributed antenna systems," submitted to CSIT, 2011.
  13. M. S. Bazaraa, H. D. Sherali, and C. M. Shetty, Nonlinear Programming: Theory and Algorithms. New York: John Wiley & Sons, 3rd ed., 2006.