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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Multi-antenna Subcarrier Allocation Using Zero-Forcing Beamforming in MIMO-OFDM Systems

다중입출력 직교 주파수 분할 다중접속 시스템에서 제로포싱 빔형성을 이용한 다중안테나 부반송파 할당 방법

  • 신영일 (KT 인프라연구소 무선인터넷개발) ;
  • 강태성 (한국과학기술원 전자전산학과 통신신호처리연구실) ;
  • 김형명 (한국과학기술원 전자전산학과 통신신호처리연구실)
  • Published : 2007.10.31
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Abstract

In this paper, a low complexity subcarrier allocation scheme is proposed for multiuser MIMO-OFDM systems with zero-forcing beamformer (ZFBF) so that the total transmit power can be minimized satisfying given target data rate. Since the optimal method requires very high computational complexity, we propose a low complextiy suboptimal method. Using the fact that the effective channel gain is proportional to the orthogonallity of channels of multiplexed users, a user set with the highest orthogonality of channel among users is assigned to each subcarrier in order to minimize required transmit power. The numerical results show that the proposed suboptimal method can reduce computational complexity with little performance loss.

본 논문에서는 제로포싱 빔형성 (ZFBF)을 이용한 Multiuser MIMO-OFDM 시스템에서 각 사용자의 주어진 요구정보량을 만족시키면서 총송신전력을 최소화하기 위한 부반송파 할당방법을 제안한다. 최적 방법의 복잡도는 부반송파의 수에 지수적으로 비례하여 증가하기 때문에 복잡도를 줄이기 위한 부최적 방법을 제안한다. 부최적 방법에서는 사용자 그룹의 채널간 직교도가 클수록 유효채널이득이 증가하는 특성을 이용하여 채널간 직교도가 큰 사용자 그룹을 할당함으로써 송신전력을 최소화한다. 모의실험 결과에서 제안한 부최적 방법이 복잡도를 현저히 감소시키면서 총 송신전력의 측면에서는 최적화된 방법과 유사한 성능을 가진다는 것을 보인다.

Keywords

References

  1. E. Telatar, 'Capacity of multi-antenna Gaussianchannels', Eur. Trans. Telecommun., vol. 10, pp. 585-598, Nov. 1999 https://doi.org/10.1002/ett.4460100604
  2. G. J. Foschini and M. J. Gans, 'On limits of wirelesscommunications in an fading environment when using multiple antennas', Wireless Pers. Commun., vol. 6, pp. 311-335, Mar 1998 https://doi.org/10.1023/A:1008889222784
  3. M. Costa, 'Writing on dirty paper'. IEEE Trans.Inform. Theory, vol.29, pp. 439-441, May 1983 https://doi.org/10.1109/TIT.1983.1056659
  4. S. Venkatesan and H. Huang, 'System capacity evaluation of multiple antenna systems using beamforming and dirty paper coding', Bell Labs
  5. G. Caire and S. Shamai, 'On the achievable throughput of a multi-antenna Gaussian broadcast channel', IEEE Trans. Inform. Theory, vol. 49, pp. 1691-1706, Jul. 2003 https://doi.org/10.1109/TIT.2003.813523
  6. B. Hochwald and S. Vishwanath, 'Space-time multiple access: Linear growth in the sum rate', in Proc. 40th Annual Allerton Conf. Commun., Control, Computer., Allerton, IL, Oct. 2002
  7. Peel, C.B., Hochwald, B.M. and Swindlehurst, A.L., 'A vector-perturbation technique for nearcapacity multiantenna multiuser communication- part I: channel inversion and regularization', IEEE Trans. on Commun., vol 53,pp.195 202, Jan 2005
  8. Taesang Yoo and Goldsmith, A, 'On the optimality of multiantenna broadcast scheduling using zero-forcing beamforming', IEEE Journal on Selected Areas in Commun., vol 24., pp. 528-541, March 2006 https://doi.org/10.1109/JSAC.2005.862421
  9. Inhyoung Kim and In-Soon Park and Lee, Y.H., 'Use of linear programming for dynamic subcarrier and bit allocation in multiuser OFDM', IEEE Trans. on Vehicular Tech., , vol 55, pp. 1195-1207, July 2006 https://doi.org/10.1109/TVT.2006.877490
  10. Cheong Yui Wong and Cheng, R.S.and Lataief, K.B.and Murch, R.D., 'Multiuser OFDM with adaptive subcarrier, bit, and power allocation', IEEE Journal on Selected Areas in Commun., , vol. 17, pp. 1747-1758, Oct. 1999 https://doi.org/10.1109/49.793310
  11. Kivanc, D.and Guoqing Li and Hui Liu; , 'Computationally efficient bandwidth allocation and power control for OFDMA', IEEE Trans, on Wireless Comm, vol. 2, pp. 1150-1158, Nov. 2003 https://doi.org/10.1109/TWC.2003.819016
  12. Ying Jun Zhang and Khaled Ben Lataief, 'An Efficient reource allocation scheme for spatial multiuser access in MIMO/OFDM systems,' in IEEE on Trans. Commun.,vol. 53, pp.107-116, Jan. 2005 https://doi.org/10.1109/TCOMM.2004.840666