Browse > Article

An Efficient Channel Feedback Method for Zeroforcing Beamforming Based Multi-User Multiple-Input Multiple-Output System  

Oh, Tae-Youl (한양대학교 전자통신공학과)
Ahn, Sung-Soo (명지전문대학 정보통신과)
Choi, Seung-Won (한양대학교 전자컴퓨터통신공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.34, no.9A, 2009 , pp. 673-678 More about this Journal
Abstract
This paper presents a feedback method for improving the system capacity of MU-MIMO system for downlink channel environments. In a typical conventional feedback method, CVQ, in order to enhance the channel capacity, not only the feedback load is increased but also the quantization of the channel vector is increased, because the channel parameter of each user has to be fed back after quantizing one of the pre-defined N-codebook vectors. In this paper, a novel feedback method is proposed which provides an improved system capacity by transferring the channel state information without increasing the feedback load. Performance of the proposed method is compared to the conventional CVQ method through computer simulations. The simulation results show that the proposed method with 3-bit feedback provides a system capacity comparable to the CVQ method of 6-bit feedback when the number of transmit antennas is 2.
Keywords
MU-MIMO; Zero-forcing; Feedback; CVQ;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Philips, 'Comparison between MU-MIMO codebook-based channel reporting techniques for LTE downlink,' 3GPP TSG RAN WG1, R1-062483, Oct. 2006
2 Q. H. Spencer, C. B. Peel, A. L. Swindlehurst, and M. Haardt, 'An introduction to the multiuser MIMO downlink,' IEEE Comm. Magazine, Vol. 42, No. 10, pp. 60-67, Oct. 2004   DOI   ScienceOn
3 A. Goldsmith et al., 'Capacity Limits of MIMO Channels,' IEEE JSAC, Vol. 21, pp. 684-702, Jun. 2003
4 N. Jindal, 'MIMO broadcast channels with finite rate feedback,' in Proc. IEEE Globecom, pp. 1520-1524, Nov. 2005
5 T. Yoo, N. Jindal, and A. Goldsmith, 'Multi-Antenna Downlink Channels with Limited Feedback and User Selection,' Selected Areas in Communications, IEEE Journal on Volume 25, Issue 7, pp. 1278-1491, Sep. 2007
6 T. Yoo, N. Jindal, and A. Goldsmith, 'Finiterate feedback MIMO broadcast channels with a large number of users,' in Proc. IEEE int. Symp. info. Th.(ISIT). seattle, WA USA, pp. 1214-1218, Jul. 2006