Browse > Article
http://dx.doi.org/10.7840/KICS.2011.36A.5.485

Optimal Selection of Reference Vector in Sub-space Interference Alignment for Cell Capacity Maximization  

Han, Dong-Keol (인하대학교 정보통신대학원 이동통신연구실)
Hui, Bing (인하대학교 정보통신대학원 이동통신연구실)
Chang, Kyung-Hi (인하대학교 정보통신대학원 이동통신연구실)
Koo, Bon-Tae (한국전자통신연구원 통방융합SoC연구팀)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.36, no.5A, 2011 , pp. 485-494 More about this Journal
Abstract
In this paper, novel sub-space interference alignment algorithms are proposed to boost the capacity in multi-cell environment. In the case of conventional sub-space alignment, arbitrary reference vectors have been adopted as transmitting vectors at the transmitter side, and the inter-cell interference among users are eliminated by using orthogonal vectors of the chosen reference vectors at the receiver side. However, in this case, sum-rate varies using different reference vectors even though the channel values keep constant, and vice versa. Therefore, the relationship between reference vectors and channel values are analyzed in this paper, and novel interference alignment algorithms are proposed to increase multi-cell capacity. Reference vectors with similar magnitude are adopted in the proposed algorithm. Simulation results show that the proposed algorithms provide about 50 % higher sum-rate than conventional algorithm.
Keywords
Interference Alignment; Sub-space Interference Alignment; Reference Vector; Sum-rate; Multi-cell;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Rahman M., Yanikomeroglu H., "Inter-Cell Interference Coordination in OFDMA Networks: A Novel Approach Based on Integer Programming," in Proc. VTC-Spring, May. 2010, pp.1-5.
2 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.
3 Changho Suh and David Tse, "Interference alignment for cellular networks," in Proc. Allerton Conf. on Commun., Control and Computing, Sep. 2008, pp.23-26.
4 한동걸, 휘빙, 장경희, 구본태, "부분공간 간섭 정렬 기법의 레퍼런스 벡터와 채널에 따른 시스템 합용량 변화," 한국통신학회 추계종합학술발표회, 2010. 11, session 6C-5.
5 Howard Anton and Robert C. Busby, Contemporary Linear Algebra, sep. 2002, John Wiley & Sons, Inc.
6 A. Paulraj et.al, Introduction to Space-Time Wireless Communications, 2003, Cambridge.
7 O. Somekh, O. Simeone, Y. Bar-Ness, A. M. Haimovich, U. Spagnolini, and S. S. (Shitz), Distributed Antenna Systems: Open Architecture for Future Wireless Communications, ch. An Information Theoretic View of Distributed Antenna Processing in Cellular Systems, Auerbach Publications, CRC Press, May. 2007.
8 X. Zhang, C. He, L. Jiang and J. Xu, "Inter-cell Interference Coordination based on Softer Frequency Reuse in OFDMA Cellular Systems," in Proc. IEEE International Conference on Neural Networks and Signal Processing, Jun. 2008, pp.270-275.
9 3GPP, R1-082896, "Coordinated Multi-cell Transmission for LTE-Advanced Downlink," ETRI.