셀 경계 지역 간섭 완화를 위한 효율적 빔포밍 및 스케쥴링 방법 = Novel Beamforming and Scheduling Method for Interference Mitigation at Cell Edge

다국어 초록 (Multilingual Abstract)

Coordinated multi-point transmission (CoMP) is a candidate technique for next generation cellular communications systems. One of the primary elements discussed in LTE-Advanced technology is CoMP, which can improve cell edge user data rate as well as spectral efficiency due to multiple input multiple output – orthogonal frequency division multiplex (MIMO-OFDM). We consider a system with multiple cells in which base stations coordinate with each other by sharing user channel state information (CSI), which mitigates inter cell interference (ICI), especially for users located at the cell edge. We introduce a new user scheduling method of ICI cancellation and the loss reduction of effective channel gain during the beamforming process, the proposed method improves the system sum rate, when compared to the conventional method by an average of 0.55bps/Hz in different number of total users per cell. It also outperforms the conventional method by approximately 0.38bps/Hz using different SNRs.

참고문헌 (Reference)

1 홍경화, "WiBro 다운링크 환경에서 여러 가지 MIMO 기법의 성능 및 연산량에 대한 비교 연구" (사)디지털산업정보학회 4 (4): 49-55, 2008

2 Jianqi Wang, "User Selection with Zero-Forcing Beamforming Achieves the Asymptotically Optimal Sum Rate" 56 (56): 3713-3726, 2008

3 Uk Jang, "Transmit Beamforming Based Inter-Cell Interference Alignment and User Selection with CoMP" 1-5, 2010

4 Ghosh, A, "LTE-advanced: next-generation wireless broadband technology [Invited Paper]" 17 (17): 10-22, 2010

5 Sˇtencel, V, "LTE Advanced - A further evolutionary step for Next Generation Mobile Networks" 1-5, 2010

6 Xin Xia, "Joint User Pairing and Precoding in MU-MIMO Broadcast Channel with Limited Feedback" 14 (14): 1032-1034, 2010

7 Xin Xia, "Coordinated scheduling and precoding in multicell MIMO system" 387-389, 2010

8 Irmer, R, "Coordinated multipoint : Concepts, performance, and field trial results" 49 (49): 102-111, 2011

9 Qixing Wang, "Coordinated Multiple Points Transmission for LTE-Advanced Systems" 1-4, 2009